Total amount of work done by the elevator is force* Displacement = 6800000 Joules.
What is work done ?It should be converted to energy in order to move an item. Energy may be transferred by the use of force. Work done refers to the amount of energy used by a force to move an item.
The product of a force's component acting in the displacement's direction and its magnitude is known as the work done by the force. Formula. The following formula may be used to determine work by multiplying force and distance in the direction of the force. Unit: W = F d.
Force applied across a distance is called work. Examples of labor include dragging down a captive helium balloon, pushing a car up a hill, and raising an object against the gravitational attraction of the Earth. Energy manifests mechanically as work. The joule (J), or newton-meter (N m), is the accepted unit of work.
The total forece acting on the elevator = (500 + 180 )*10 = 6800 N
Total distance traveled = 100 m
Total amount of work done by the elevator is force* Displacement = 100 * 6800 = 6800000 Joules.
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Is kinetic energy zero positive or negative?
Kinetic energy is always positive since it is based on motion. If an item is not in motion, its kinetic energy is 0. Kinetic energy has no negative value. Kinetic energy is defined as one-half of the mass.
multiplied by the velocity squared (KE = 1/2*m*v2). Kinetic energy is always positive since it is based on motion. If an item is not in motion, its kinetic energy is 0. Kinetic energy has no negative value. Kinetic energy is energy that is created by motion. To put it another way, moving objects contain something called kinetic energy. Kinetic energy is defined as one-half of mass multiplied by velocity.divided by half (KE = 1/2*m*v2). The mass should be expressed in kilograms (kg) and the velocity in meters per second (m/s) in SI units. The mass should be expressed in pound mass (lbm) or slug, and the velocity in feet per second (ft/sec).
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Suppose 72% of students in the U. S. Would give their teachers a positive rating if asked to score their
effectiveness. A survey is conducted in which 500 students are randomly selected and asked to rate their
teachers. Let X = the number of students in the sample who would give their teachers a positive rating.
A. Show that X is approximately a binomial random variable.
B: Students either give a positive or negative rating
I: Since there are more than 10(500) students in the population, we can assume independence
N: 500 students were selected
S: P(positive rating) = 0. 72 for each student.
B. Use a Normal approximation to find the probability that 400 or more students would give their teacher
a positive rating in this sample
A. X is approximately a binomial random variable because it is the number of successful trials (students giving a positive rating) out of a fixed number of trials (500 students selected) and the trials are independent.
B. To use a Normal approximation, we can use the Central Limit Theorem which states that the sum of a large number of independent and identically distributed random variables will tend to have a normal distribution. So, we can approximate X ~ N(np, npq), where n = 500, p = 0.72, and q = 1 - p = 0.28.
Then, we can find the probability that 400 or more students would give their teacher a positive rating by using the cumulative distribution function (CDF) of a Normal distribution.
P(X >= 400) = P(Z >= (400-np)/sqrt(npq))
where Z is a standard normal variable
We can use a standard normal table or calculator to find P(Z >= (400-np)/sqrt(npq))
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How hazardous are car batteries?
Recharging, moving, or shaking a lead-acid battery can produce an explosive mixture of hydrogen and oxygen gases that escape through the battery's vents. These fumes, if allowed to accumulate in a small area, ignite easily and can cause a fire or explosion.
Environmental impact of car batteriesBattery recycling of automotive batteries reduces the need for resources required for the manufacture of new batteries, diverts toxic lead from landfills, and prevents the risk of improper disposal. Once a lead–acid battery ceases to hold a charge, it is deemed a used lead-acid battery (ULAB), which is classified as hazardous waste under the Basel Convention.
The 12-volt car battery is the most recycled product in the world, according to the United States Environmental Protection Agency. In the U.S. alone, about 100 million auto batteries a year are replaced, and 99 percent of them are turned in for recycling. However, the recycling may be done incorrectly in unregulated environments. As part of global waste trade, ULABs are shipped from industrialized countries to developing countries for disassembly and recuperation of the contents. About 97 percent of the lead can be recovered. Pure Earth estimates that over 12 million Third-World people are affected by lead contamination from ULAB processing.
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In trial 1 of an experiment, a cart moves with speed v0 on a frictionless, horizontal track and collides elastically with another cart that is initially at rest. In trial 2, the setup is identical except that the carts stick together during the collision. How does the speed of the two-cart system’s center of mass change, if at all, during the collision in each trial?
a. Trial 1: Does not change, Trial 2: Does not change
b. Trial 1: Does not change, Trial 2: Decreases
c. Trial 1: Decreases, Trial 2: Does not change
d. Trial 1: Decreases, Trial 2: Decreases
The speed of the two-cart system's center of mass after elastic collisions in both the trials of the experiment does not change hence option A is the answer to the question.
In an elastic collision, the total kinetic energy of the two colliding bodies remains the same. Both momentum and kinetic energy of the enclosed system are conserved in elastic collisions.
Hence, KE(i) = KE(f) and p(i) = p(f)
The individual speeds of the two objects colliding elastically, whether in an head-on collision or at some angle, may change accordingly after the elastic collision. But on a frictionless horizontal track, the speed of the center of mass of the whole system does not change since there is no external force acting on the system. The system moves as if all the mass involved is concentrated at a single point.
Thus the answer to the question would be option A, i.e. the speed of center of mass of the system in both the trials would remain unchanged.
Meanwhile, in an inelastic collision, the linear momentum of the system is conserved as like in elastic collision but there is a loss in kinetic energy in this case thus, the energy is not conserved in an inelastic collision.
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When a pendulum is swinging and it is at its highest point which energy store has filled?
When a pendulum is swinging and it is at its highest point, Potential energy store has filled.
The kinetic energy of the pendulum is zero, as the velocity of the bob is zero at this point.
Potential Energy is the energy that an object possesses due to its position or configuration. It is the energy that an object has due to its height above some reference point. In the case of a pendulum, the potential energy is stored in the bob due to its height above the lowest point of its swing. As the pendulum swings back and forth, the potential energy of the bob is converted into kinetic energy as it falls, and then back into potential energy as it reaches the highest point of its swing.
At the highest point of the swing, the bob has the maximum potential energy and zero kinetic energy. As the pendulum swings, the potential energy will decrease and the kinetic energy will increase. At the lowest point of the swing, the bob will have zero potential energy and maximum kinetic energy.
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if the brake pedal is spongy after brake system hydraulic repairs, you will need to bleed the brakes of any remaining trapped air in the system. group of answer choices true false
If the brake pedal is spongy after hydraulic repairs to the brake system, the brakes need to be bled. The air trapped in the system is true
If your brakes are soft or spongy, it's a good time to change or flush out your brake fluid. Flushing the brake fluid, commonly called brake bleeding, removes the air. (Brake bleeds use fluid to force air out of the brake system.) Over time, brake fluid absorbs water. The presence of air in the hydraulic system slows the system's instantaneous response, resulting in a slow actuator response and a "spongy feel". This is due to the compressibility of trapped air.
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A Class 1 power-limited circuit shall be supplied by a source that has a rated output of not more than 30 volts and ? .
a. 5,000 VA 725.41(A)
b. 8,000 VA 725.41(A)
c. 3,000 VA 725.41(A)
d. 1,000 VA 725.41(A)
"A class 1 power-limited circuit shall be supplied by a source that has a rated output of not more than 30 volts and 1000 volt-amperes."
A loop in which current can flow is a circuit. A power source, such as a battery, provides the circuit with the energy it needs to run. Electrons in a circuit travel from the negative side to the positive side of a power source before going back to the negative side. Once the electrons have returned to the power source, the circuit is finished.
The voltage source, which also functions as its electron source, provides the electrons needed to power the circuit. Voltage is frequently obtained from electrical connections such as outlets and batteries.
The voltage source's output energy is consumed by the load. Loads are what make a circuit function in different ways, for as by producing sound or light.
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meditation can help facilitate the formation of new neurons and synapses.true or false
Yes
Our intelligence does not hold fixed hardwiring; the affecting animate nerve organs pathways and circuits can change accompanying learning and accompanying insane exercises, and contemplation may be an innocent habit to help the growth of new neurons (neurogenesis) in addition to the composition of new connections middle from two points existent neurons (synaptogenesis). By joining the neurobiological effects of neurotransmitters, ideas, insane exercise, and the practical evidence from the psychological experiments, it is clear that contemplation is an effective situation for tension, and it does not contract an illness any reactions. It concedes a possibility still functions as a preventive medicine; so, it is very recommended to all and not restricted to inmates suffering from the ailment. The body produces intelligence-derivative neurotrophic factor(BDNF) through a deoxyribonucleic acid that provokes a protein verbalization. The factor, therefore, enhances essential in the regulation of intellect containers, containing their growth, support, and development.They further experienced reductions in cortisol and few angering markers. Lowering incessant redness may help maintain complete thought.read more about meditation and neurons
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a rubber rod exerts no electric force on a small electrically neutral scrap of paper. after it is rubbed on cat fur for several seconds, the rod exerts an attractive force on the scrap. part a is the force exerted by the fur on the same scrap attractive or repulsive?
The force exerted by the fur on the scrap would be attractive.
When something is rubbed with cat fur, electrons are transferred from the fur to the object being rubbed, resulting in the object becoming electrically charged. Since like charges repel one another, the scrap would be charged with the same type of charge as the rod, resulting in an attractive force between the two.
The magnitude of the force of attraction is determined by several factors, including the type of material, the distance between the two particles, and the amount of charge on each particle. Generally, the closer the two particles are and the greater the charge on each particle, the stronger the attractive force will be.
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a fisherman throws the iron anchor from his floating boat into the lake. does the level of the lake rise, fall, or stay unchanged?
When the fisherman throws the iron anchor from his floating boat into the lake the level of the pond falls.
With the introduction of the "CQR," created by Scottish inventor Geoffrey Ingram Taylor in the early 1930s, modern boat anchor development has progressed rather independently from that of the first half of the 20th century. Since this design was asymmetrical, bow rollers had to be used to efficiently stow it. This works well for small yachts and boats, but it doesn't scale well for huge cargo. Lewmar is now the company producing the CQR.In the 1940s, American Richard Danforth created and refined the "Danforth" pattern, a nod to symmetry but with very broad flat plate flukes. This anchor performs poorly in other areas but has very good holding power for its weight (high efficiency), making it ineffective.
While the anchor is in the boat, its weight displaces a volume of water V1 equal in weight to the anchor (by Archimedes' principle). After being thrown overboard, the sunken anchor displaces a lesser volume of water V2, equal in volume to the anchor.
V2 is less than V1 because the anchor is denser than water (otherwise it would not sink!) So, with less water displaced, the level of the lake falls.
Therefore, When the fisherman throws the iron anchor from his floating boat into the lake the level of the pond falls.
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A class __ lever never has a mechanical advantage.
A class __ lever always has a mechanical advantage.
A class __ lever could go either way.
O 3; 2; 1
O 2; 1; 3
O 2; 3; 1
O 1; 2; 3
A class 3 lever never has a mechanical advantage.
A class 2 lever always has a mechanical advantage.
A class 1 lever could go either way.
Therefore, the correct answer option is: A. 3; 2; 1.
What is mechanical advantage?In Science, mechanical advantage can be defined as a ratio of the output force of a lever to the force acting on it (input force or effort), assuming no losses due to wear, flexibility, tear or friction.
This ultimately implies that, different lever designs can be suitably engineered and developed to alter the brake pedal effort (input force) that is required of the driver, especially by using different levels of mechanical advantage.
In conclusion, a 3rd class lever is the most common in the body and it is a type of lever that never has a mechanical advantage.
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Answer:
(Question)
A class __ lever never has a mechanical advantage.
A class __ lever always has a mechanical advantage.
A class __ lever could go either way.
(Answer)
3;2;1
(Question)
A lever is used to lift an object with a weight of 60 Newtons. The effort force is 15 meters from the fulcrum, while the load force is 5 meters from the fulcrum. What is the mechanical advantage?
(Answer)
3
(Question)
With which class of levers is it possible to increase the force that must be applied?
(Answer)
class 1 and 3
(Question)
600 Joules of work is used to lift a box from the ground to a height of six meters. How much work would have been done if a lever would have been used with an effort arm of 12 meters and a load arm of 6 meters?
(Answer)
600 J
(Question)
A lever with an effort arm of 10 meters and a load arm of 2 meters is used to lift an object weighing 220 Newtons to a height of 4 meters. If 400Joules of work is done, how much force must have been applied?
(Answer)
100 N
Explanation:
i just finished the quick check UwU
As she clima a hill, a cyclist slows down from 40km/h to 10km/h in 10 seconds.what is her deceleration?
Answer:
To find the deceleration of the cyclist, we can use the equation:
deceleration = (change in velocity) / time
where change in velocity is the difference between the final and initial velocities, and time is the amount of time it takes to slow down.
The change in velocity is:
40 km/h - 10 km/h = 30 km/h
Converting this to m/s:
30 km/h * (1000 m/km) / (3600 s/h) = 8.333 m/s
Now we can calculate the deceleration as:
deceleration = (8.333 m/s) / 10 s = 0.8333 m/s^2
So the cyclist's deceleration is 0.8333 m/s^2.
What does it mean when there is no kinetic energy?
The kinetic energy of an item is 0 if it is not moving. There can never be a negative number for kinetic energy. Kinetic energy (KE) is defined as the product of the mass times the square of the velocity.
Kinetic energy, often known as the energy of motion, may be seen in the motion of things and subatomic particles. Kinetic energy may be found in all particles and moving objects. Examples of kinetic energy in action include a person walking, a baseball flying through the air, food tumbling off a table, and a charged particle in an electric field. Kinetic energy may be calculated as follows: K.E. is defined as the product of the square of the velocity and the mass of an object, or m/v2. The kinetic energy is given in kilogram-meter squared per second squared if the mass is measured in kilogrammes and the velocity is measured in metres per second.
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a ray of light strikes a mirror at an angle of 38 to normal. what is the angle between the incident rayt and the reflected ray
The angle between the incident ray and the reflected ray for a ray of light at an angle of 38° to the normal is 76°.
The angle of incidence, in geometric optics, is the angle between a ray incident on a surface and the line perpendicular (at a 90° angle) to the surface at the point of incidence, called the normal. The angle of reflection is the angle between a reflected ray and the normal drawn at the point of incidence to a reflecting surface.
The angle at which the light falls on the mirror is 38° to the normal. So the angle of incidence is 38°. Then the angle between the incident ray and the reflected ray is 38°+38°= 76°.
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The Moon's velocity changes continuously as it orbits the earth, bat on average its translational velocity comes out to about 2.3 kilometers per second. what is tthis speed in proper SI units
Answer:
Explanation:brbejkw
an object has a mechanical energy of 1575 J and a potential energy of 1265 J. a.what is the kinetik energy of the object. b. if the mass of the object is 12 Kg, what is the speed . c. how high above ground is the object.
The kinetic energy of the object is 310 joule.
The speed of the object is 7.19 m/s.
The height of the object is 10.75 meter.
What is energy?Energy is the quantitative quality that is transferred to a body or to a physical system in physics. Energy is a preserved resource.
a) The kinetic energy of the object = mechanical energy - potential energy
= 1575 J -1265 J
= 310 joule.
b) the speed of the object = √(2 × 310/12) m/s
= 7.19 m/s
c) Height of the object = 1265 ÷ (12 × 9.8) meter
= 10.75 meter.
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Remember, the girls are studying Newton's 2nd law: F = ma. The teacher asked the girls to hypothesize about the acceleration in each one of the four trials. Then they would use their data to calculate "a" or acceleration in the formula. Help them out. What would hypothesize about the value of "a" in this experiment?
They are the foundation of classical mechanics.
What is the difference between a hypothesis theory and a law?A hypothesis is a speculative explanation that may be tested by more research. A theory is a well-supported explanation for observed phenomena. A scientific law is a summary of the relationship between variables. A regulated way of evaluating a hypothesis is an experiment. A significant feature shared by a scientific hypothesis, theory, and rule is that they are all founded on observations. A scientific observer notices a phenomena and attempts to explain what they saw.
The terms “IF” and “THEN.” Are frequently used in hypothesis writing. “If I do not study, then I will fail the test.” For example. Your independent and dependent variables are reflected in the “if” and “then” statements. Your theory should be related to your
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the ejection of electrons from the surface of a wire due to increased heat causing an electron cloud is called
The ejection of electrons from the surface of a wire due to increased heat causing an electron cloud is known as thermionic emission.
What is the term used to describe thermionic emission?Thermionic emission is also known as Edison effect. Edison effect refers to the flow of charged particles known as thermions from a charged metal or a charged metal oxide surface, which results in the thermal vibrational energy overriding the electrostatic forces binding electrons to the surface.
What do you mean by an ejected electron?The ejected electrons are known as photoelectrons. It is significant to remember that the frequency of the light that is reflected on the metal's surface affects the ejection of emitted electrons and the kinetic energy of the emitted photoelectrons.
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identify the type of solar radiation that is absorbed by stratospheric ozone, and describe one human health benefit that results from the absorption of this solar energy.
Radiation that has been absorbed is ultraviolet radiation. Lower incidences of skin cancer, eye damage, and sunburns are all benefits to human health.
Ultraviolet (UV) energy from the sun is filtered by stratospheric ozone, a naturally occurring gas. Since it lessens the negative effects of ultraviolet (UV-B) light, this is commonly referred to as good ozone.
The ozone layer in the stratosphere prevents a portion of solar radiation from reaching the surface of the planet. The UV B part of UV radiation is what it absorbs most significantly. The ultraviolet light known as UV B, which is produced by the sun and sunlamps, has a number of negative effects.
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A ring of charge is centered at the origin in the vertical direction. The ring has a charge density of λ = 4. 48 × 10 − 6 C/m λ=4. 48×10−6 C/m and a radius of R = 2. 71 cm. R=2. 71 cm. Find the total electric field, E , E, of the ring at the point P = ( 1. 10 m, 0. 00 m). P=(1. 10 m, 0. 00 m). The Coulomb force constant is k = 1 / ( 4 π ϵ 0 ) = 8. 99 × 10 9 N ⋅ m 2 / C 2
The value of electric field is 0.150 × 10 ⁻⁶ V/m.
Given,
Radius = 2. 71 cm = 0.0271 m, So, 2лг = Сircumference
Charge density = 4. 48 × 10 ⁻⁶ C/m
k = 1 / ( 4 π ϵ 0 ) = 8. 99 × 10⁹ N ⋅ m 2 / C 2
Total charge = 2πr × λ
Electric potential= [tex]K \frac{q}{r} = \frac{1}{4. \pi. \epsilon o} . \frac{2 \pi r \lambda}{[x^{2} +r^{2}]^{1/2} }[/tex]
= 8. 99 × 10⁹ × [2 π × 0.0271 × 4. 48 ×10 ⁻⁶ ] / √10² + 0.0271²
= 8. 99 × 10⁹ × [0.72 × 10 ⁻⁶] / 10
So, Electric field = V /r cosθ
After substituting the values,
we get
⇒ [tex]\frac{ r\lambda x }{2 \epsilon o (x^{2} + r^{2} )^{3/2} }[/tex]
⇒ [0.0271 m . 4. 48 × 10 ⁻⁶. 1. 10] / [2εο × (10)^(3/2)]
⇒ 0.133 × 10 ⁻⁶ × 56.45 × 10⁹ / 500
⇒ 0.150 × 10 ⁻⁶ V/m
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How much heat is required to boil 3kg water which initially 10c ?
Answer:
126 KJ
Explanation:
Is kinetic energy high or low?
Kinetic energy is high when an object is moving at a fast speed. It is low when an object is moving at a slow speed or is at rest.
A sort of energy that an object has because it is in motion is called kinetic energy. It is calculated as the product of the object's mass and the square of its velocity. The formula for kinetic energy is KE = 1/2 * m * v^2, where m is the object's mass and v is its velocity. The unit of kinetic energy is typically joules (J) in the International System of Units (SI). When an object's velocity increases, its kinetic energy also increases. Conversely, when an object's velocity decreases, its kinetic energy decreases. An object has no kinetic energy when it is at rest. Kinetic energy is an important concept in many areas of physics, such as mechanics, thermodynamics, and atmospheric science. It plays a role in understanding the motion of objects, the effects of force and energy, and the behavior of gases and fluids.
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HELP ME ASPP PLEASE THANK YOU
Heating curve
the temperature of a substance as the average kinetic energy of all the atoms or molecules of that substance
What is heating curve?Heating curves show how the temperature changes as a substance is heated up. Cooling curves are the opposite. They show how the temperature changes as a substance is cooled down. Just like heating curves, cooling curves have horizontal flat parts where the state changes from gas to liquid, or from liquid to solid.A heating curve is a plot or graph wherein a substance is subjected to increasing temperature against time to measure the amount of energy it absorbs and changes state with increasing temperatureTemperature increase: liquid heating up requires 1 calorie for each increase of 1 degree Celsius for each 1 gram of water [so 1 g of liquid water increasing from the melting point (0 degrees Celsius) to the boiling point (100 degrees Celsius) requires 100 calories]To learn more about heating curve refers to:
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A long 20 m ladder weighs 80 kg and is resting against a smooth. The bottom of the ladder is at an angle of 60 degrees with the ground which has a coefficient of static friction of. 3. How far can a 150 kg person go up the ladder before it begins to slip?.
An individual weighing 150 kg can climb the ladder for 4116.62m before it starts to slide.
What does physics mean when it refers to a force?In mechanics, a force is any action that has the potential to change, maintain, or distort a body's motion.
∑Fx = 0
[tex]N_{L}[/tex] - [tex]W_{L}[/tex] - [tex]W_{P}[/tex] = 0
[tex]N_{L}[/tex] - Normal force
[tex]W_{L}[/tex] - weight of ladder
[tex]W_{P}[/tex] - weight of person
Thus, we can find the normal force,
[tex]N_{L}[/tex] = mLg + mpg
[tex]N_{L}[/tex] = g (mL + mp)
[tex]N_{L}[/tex] = 9.8(80+150)
[tex]N_{L}[/tex] = 9.8(230)
[tex]N_{L}[/tex] = 2254N
We are aware that the friction force is the result of multiplying the normal force by the static friction coefficient. Let's locate it.
Ff = µ [tex]N_{L}[/tex] = 0.3×2254
Ff = 676.2N
We can also say that the total sum must be equal to zero with reference to the x-direction forces.
∑Fx = 0
- N wall + Ff = 0
N wall = Ff = 676.2N
where N(wall) denotes the wall's normal force. (In a negative manner)
Since the total torque must be zero as we previously stated, we now have
τ = T wall +τL + τP = 0 (1)
Choosing the pivot point at the bottom of the ladder, we have the following options:
We must use the components because every force acting on the ladder must be perpendicular to it.
τ wall = r wall × N wall sin(60)
τ wall = 20×676.2×(-0.304)
τ wall = -4111.296Nm (- ve due to clock wise direction)
τL = r L × W L sin (30)
τL = 20/2× 80(-0.988)
τL = 10×80(-0.988)
τL = - 790.4Nm (- ve due to clock wise direction)
τP = rP × WP sin(60)
τP = rP×150(-0.988)
τP = - rP 148.2Nm(- ve due to clock wise direction)
We choose 60° because that is the angle between the ladder's surface and weight vector; we choose the same angle for people.
τ = τ wall + τL +τP
τ = -4111.296 - 790.4 - rP 148.2 = 0
rP = 4116.62m.
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experiment begins with block horizontal. one end of board is slowly raised. which identifies the block that will start sliding down first and why?
Block 1 will begin to slide down first because of its smaller coefficient of friction. The right answer is, therefore, B.
The coefficient of static friction (μ) between two surfaces is a measure of the amount of force that is required to overcome the forces holding the two surfaces together and start them sliding against each other. The coefficient of friction depends on the properties of the two surfaces in contact and typically ranges from 0 (no friction) to 1 (maximum friction).
In this experiment, Block 1 has a coefficient of static friction of 0.20 and Block 2 has a coefficient of static friction of 0.40. This means that it takes more force to start Block 2 sliding than it does to start Block 1 sliding. Therefore, Block 1 will start sliding down the board first. The reason is that the coefficient of friction is smaller for Block 1 than for Block 2, which means the block has less resistance to sliding and will move more easily.
This question isn't complete, and answer choices should be added, which are:
In an experiment, two blocks of different roughness are placed on the same rough wooden board. The table below shows three values for each block: the mass, the area of the block in contact with the board, and the coefficient of static friction μ? between the block and the board. The experiment begins with the board horizontal. One end of the board is then slowly raised.
Block 1 : mass (kg) is 0.75 - area 75 square centimeters - μ 0.20. Block 2 : mass (kg) is 3.0 - area 100 square centimeters - μ 0.40.Which of the following correctly identifies the block that will start sliding down the board first and why?
A. Block 1 because it has less mass per unit area.B. Block 1 because the coefficient of friction is smaller.C. Block 2 because it has greater mass.D. Block 2 because it has a smaller surface area.E. Block 2 because the coefficient of friction is larger.The correct answer is B.
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why is it harder to breathe when climbing up a high mountain?
As altitude increases, the air becomes thinner and less oxygen-saturated.
At sea level, around a fifth of the air you breathe is oxygen and the air pressure is around 760 mmHg. As altitude increases, pressure decreases and the air becomes ‘thinner’. Higher pressure at sea level keeps oxygen molecules compressed together in air, so it is easier for us to breathe the amount we need in just one breath. At higher altitudes, the molecules spread out and in the same single breath there are fewer oxygen molecules and we need to work much harder to get the same amount of oxygen
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If the pressure on an object, submerged in an unknown fluid is 637,000Pa at a depth of 57.52 m, what is the object's density?
Answer: not very sure
=11074.4089
Explanation:
637000/57.52 = 11074.4089
The pendulum of a clock is displaced by a distance of 4.0 cm and it oscillates in s.h.m. with a with a period of 1 s.
a. calculate the maximum velocity of the pendulum bob.
Its velocity when its displacement is 2.0 cm
How do you find the velocity of a pendulum bob?As the pendulum swings downward, gravity converts this potential energy into kinetic energy, so that at the bottom of the swing, the pendulum bob has zero potential energy, and its kinetic energy, (1/2)mv2, equals the inital potential energy (mgh). (So the velocity, v, equals √(2gh).)he maximum velocity occurs at the equilibrium position ( x = 0 ) ( x = 0 ) when the mass is moving toward x = + A x = + A Terminal velocity is the maximum velocity (speed) attainable by an object as it falls through a fluid (air is the most common example). It occurs when the sum of the drag force (Fd) and the buoyancy is equal to the downward force of gravity (FG) acting on the object.To learn more about velocity of a pendulum bob refers to:
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Which of the following observations best supports Alfred Wegener’s theory of continental drift?
Identical fossils are found along the coastal region of Africa and South America, i.e., the fossil evidence supports Alfred Wegener's theory of continental drift.
The fossils of same organisms are found on lands or continents that are far apart now. This made him believe that these continents might have been together as a single landmass in ancient days and while they drifted same species of animals got separated by geographical barriers.
What are fossils?Fossils are preserved dead remains of organisms or parts or impressions of their body that lived in the past.
Who was Alfred Wegener?Alfred Wegener was a German geophysicist, meteorologist and polar researcher who gave the theory of Continental Drift in his 'The Origin of Continents and Oceans'.
What are geographical barriers?The naturally formed barriers like mountains, oceans etc that separate landmasses and living creatures are called geographical barriers.
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An ice skater initially skating at a velocity of 3 m/s speeds up to a velocity of 5 m/s. The momentumof the skaterA Remains the sameB IncreasesC Becomes zeroD Decreases
The relationship between mass and speed and momentum is straightforward. The object's momentum increases proportionally to changes in either mass or velocity. Momentum is doubled by doubling mass or speed.
The Correct Answer is Option C.
What is the Law of Conservation of Momentum?Momentum is the result of the product of an object's mass and velocity, and it is a property shared by all moving objects. This can be expressed as an equation, where p stands for momentum, as follows: p = m v. As a result of an object's variable velocity, it also has a variable momentum. The momentum of an object system can be explained by the Law of Conservation of Momentum. The Law of Conservation of Momentum teaches us that the overall momentum of an isolated system stays constant. When there are no external influences on the system's objects, the system is said to be isolated. Here is a picture of Newton's Cradle, which is a great way to illustrate momentum conservation.As the ball's momentum is transferred to the ball at the other end, the system's overall momentum is conserved when one ball moves and collides with the others in this situation.To Learn more About momentum refer To:
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