Answer:
C
Explanation:
We have to use the formula for potential energy(mgh).
MGH=(1)*(9.8)*(2)=19.6
why has si system been developed? give reasons
Answer:
It allows people in different places and different countries to use the same units, avoid mistakes and understand each other more easily. The common base 10 of all units makes it easier and has more accurate calculations that are made without cumbersome conversion factors.
Answer:
Explanation:
As we know that the SI units are extended versions of the MSK system. SI system helps us to calculate the appropriate measurement of any quantity. SI system is convenient(easy) to use and it is also followed all over the world which can help in international trade as well. So, SI system been developed.
You hold a pen up in the air and then let go of it. The pen's inertia is its tendency to
- maintain a constant speed
why is this
Explanation:
The gravity gives the pen a constant force pointing to the center of the earth. And because of Newton's Second law: The acceleration of an object is directly proportional to the force it receives, inversely proportional to its mass, and the direction of acceleration is the same as the direction of the force.
So the pen has a tendency to going straight down on the ground. I don't think it maintain a constant speed but a constant acceleration. And the rate of the acceleration is approximate 9. 8m/s^2.
And as for its inertia, Newton's original statement in Principia mathematica was that any body should remain in uniform motion in a straight line or at rest until an external force forces it to change its motion. Bodies are too lazy to move if you don't force them. The moment you let go of the pen, the initial speed is zero. And it gains a acceleration of 9. 8m/s^2
According Newton's law of inertia, the pen tends to continue in its state of motion or rest. Hence, the pen tends to move in a constant velocity.
What is inertia ?Newton's first law of motion states that, every objects tends to continue on the state of motion or rest until an external force acts on it. This tendency of objects is called inertia.
We can experience inertia in many situations. A very common example is ,when a stationary bus move backward when it started quickly that it tends to stay on rest. Similarly we will move forward when the bus suddenly breaks.
The similar effect is encountered in the pen here. When it moves through the air, except the air resistance no other force to resist its motion and it tends to move in a constant speed.
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#SPJ2
A beam of light, traveling in air, strikes a plate of
transparent material at angle of incidence of 56 degrees. It is observed that the reflected and refracted beams form an angle
of 90 degrees. What is the index of refraction of this material?
Explanation:
I hope you benefit from me...
One of the fastest elevators in the world is found in the Taipei 101 building. It ascends at 16. 83 m/s and rises 382. 2 m. Each elevator has a maximum load capacity of 1600 kg. What power is required to raise a load of 1160 kg from the lowest level to the top floor?
This question involves the concepts of potential energy, power, and time.
The power required to raise the load from the lowest level to the top floor is "264.16 KW".
PowerThe power required by the lift can be calculated by the following formula:
[tex]P = \frac{P.E}{t}[/tex]
where,
P = power = ?P.E = Potential Energy = mghm = mass load capacity = 1600 kgg = acceleration due to gravity = 9.81 m/s²h = height achieved = 382.2 mt = time = [tex]\frac{h}{v}[/tex]v = speed = 16.83 m/sTherefore,
[tex]P=\frac{mgh}{\frac{h}{v}}\\\\P = mvg = (1600\ kg)(16.83\ m/s)(9.81\ m/s^2)[/tex]
P = 264163.68 = 264.16 KW
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Please help in this file below
Answer:
B. South East
Explanation:
When using the lens equation, a negative value as the solution for di indicates that the image is real. Virtual. Upright. Inverted.
Option B is correct. A negative value as the solution indicates that the image is Virtual.
What is the lens equation?The Lens formula describes the relationship between the distance of an image (v), the distance of an object (u), and the focal length (f) of the lens in optics.
The lens equation is given below;
[tex]\frac{1}{v}-\frac{1}{u}=\frac{1}{f}[/tex]
When light beams from the same spot on an item reflect off a mirror and diverge or spread apart, virtual pictures are formed.
Hence option B is correct. A negative value as the solution indicates that the image is Virtual.
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Answer:
B. Virtual
Explanation:
Edge 2023
Less massive molecules tend to escape from an atmosphere more often than more massive ones because
A. they are more buoyant.
B. the gravitational force on them is less.
C. they are smaller and thus experience fewer collisions on their way out.
D. they are moving faster.
We can confirm that less massive molecules tend to escape from an atmosphere more often than more massive ones because they are moving faster.
How does speed help molecules escape?This has to do with the energy of the molecules. Speed comes with its higher kinetic energy. This higher level of energy helps the molecules to escape by giving them enough energy to overpower the force of gravity acting upon them in the atmosphere.
Therefore, we can confirm that less massive molecules tend to escape from an atmosphere more often than more massive ones because they are moving faster.
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an unbalanced force of 10 N causes an object to accelerate at 2 m/s. What is the mass of the object? ___kg
Answer: mASS OF OBJECT = 5 KG
Explanation: BY USING FORmULA OF UNBALANCE FORCE
F = ma
10 = m x 2
m = 10 / 2
m = 5 kg
what is the force constant of spring which is streched
a.2mm by a force of 4N
b.4cm by a mass of 200g
c.2cm by a mass of 1kg
Explanation:
a. F=kx
4=k (2×10^-3)
k= 2000 N/m
b. mg=kx
0.2 ×10 = k (4×10^-2)
2/(4×10^-2) =k
k=50 N/m
c. mg=kx
1×10 = k (2×10^-2)
½ × 10² =k
k=50N/m
wht is error of parallax?
Answer: A parallax error is an apparent shift in an object's position as it is viewed from different angles. For example, the error is most easily noticed by looking at a nearby object with one eye closed, then looking at it through the other eye.
Explanation: Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines. Due to foreshortening, nearby objects show a larger parallax than farther objects when observed from different positions, so parallax can be used to determine distances.
What direction does the magnetic needle of a compass point to?.
Answer:
the magnetic needle of a compass point to north and the other needle points to south
Explanation:
someone please answer this, ill give you brainliest and your getting 100 points.
Answer:
E) All of the above
Explanation:
PLEASE MARK ME AS BRAINLIEST
Answer:
I believe it's number 2 not for sure.
Explanation:
hope this helps you
All but one statement below is true. Find the false statement about the Heating Curve. Consider the heating curve of this unknown, substance X. Please alert your teacher if this image is missing. All but one statement below is true. Find the false statement about the Heating Curve. The melting point is 20°C. Throughout the heating curve (A --> E), kinetic energy is increasing. At point C, substance X is in the liquid state. During B and D, the potential energy of substance X is increasing as it undergoes a state change.
The various points on the heating curve corresponds to melting, boiling and vaporization.
Heating curveA heating curve is a plot of temperature against time. The heating curve reveals how the temperature of the body changes with time during heating.
The heating curve is not shown here hence the question is incomplete. However, we must note that The various points on the heating curve corresponds to melting, boiling and vaporization.
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Answer: I'm not exactly sure, but I would say the answer is
B. Throughout the heating curve (A --> E), kinetic energy is increasing.
Explanation: Throughout the entire heating curve diagram, it is not ALWAYS the kinetic energy increasing because Points B and D shows the potential energy increasing as it goes through the phase changes.
I'm sorry if it isn't right, but to lower the chances, I know for sure that the incorrect answers are C and D.
What type of galaxy is pictured? (4 points)
1. Irregular
2. Spiral
3. Lens
4. Elliptical
Answer:
Elleptical
Explanation:
An elliptical galaxy is a type of galaxy with an approximately ellipsoidal shape and a smooth, nearly featureless image. They are one of the four main classes of galaxy described by Edwin Hubble in his Hubble sequence and 1936 work The Realm of the Nebulae, along with spiral and lenticular galaxies
which of the following is a point source of water population?
a. City streets
b. A farm
c. Gas-burning vehicles
d. A suburban development
Answer:
city streets
sorry if it's wrong!A solid metal bar is at rest on a horizontal frictionless surface. It is free to rotate about a vertical axis at the left end. The figures below show forces of different magnitudes that are exerted on the bar at different locations. In which case does the bar’s angular speed about the axis increase at the fastest rate?.
The case where the angular speed of the bar will increase at a fast rate is at smaller radius compared to the initial radius from the center of rotation.
Conservation of angular momentumThe principle of conservation of angular momentum states that the total angular momentum of a closed system is always conserved.
[tex]I_i \omega _i = I_f \omega _f[/tex]
where;
Ii is initial moment of inertia of the solid sphereIf is the final moment of inertia of the solid sphereωi is the initial angular speed ωf is the final angular speed[tex]\omega _f = \frac{I_i \omega _i }{I_f} \\\\\omega_f = \frac{(1/2MR_i^2)\omega _i}{1/2 MR_f^2}\\\\\omega _f = \frac{R_i^2 \omega _i}{R_f^2}[/tex]
where;
M is mass of the barR is radiusThe angular speed of the bar depends of the moment of inertia of the bar which in turn depends on axis of rotation.
Thus, the case where the angular speed of the bar will increase at a fast rate is at smaller radius compared to the initial radius from the center of rotation.
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I don't understand..
Explanation:
What's the requirements
A and C must be equalWhy?
F_net=Total upward force-Total downward force=0NSo box remains on groundAnd
B must be less than DOption A is correct
Im doing the MT. Thielson
1. Title slide
2. status of the glaciers (are they growing or shrinking,
how fast, how many are there in your assigned area)
the impact of those changes on the local water cycle
(think rivers and lakes and be specific - what lakes
and rivers? Include some pictures of the ones that
you talk about)
3. how glaciers have shaped the mountain and the
area around it.
4. Other features of interest (what people do on or
around the mountain/range, what other points of
interest are nearby - describe and include pictures).
5. Bibliography slide - this can be very informal. Just
copy/paste the URLs from the sites where you find
information.
I can help you.
I can make a slides and send it to you. this is actually very simple. just takes some time. I can do it.
Why can we hear sounds outside of a door when music is playing on the inside?
How many opportunities does a candidate have to pass the test ?
Answer:
Nearly half of California’s potential teachers struggle to pass a gauntlet of standardized tests required for them to earn a credential, making it more difficult for the state to put a dent in a persistent teacher shortage.
A car accelerates on a horizontal surface, with friction, over a distance. Which equation is equal to the work done by the engine of the car?
A. (change in kinetic energy of the car) + (frictional force) (distance)
B. (change in kinetic energy of the car) - (friction energy) (distance)
C. (change in momentum of the car) - (friction energy) (distance)
D. (change in potential energy of the car) + ( frictional energy) (distance)
Answer:
B
Explanation:
The equation is equal to the work done by the engine of the car will be (change in kinetic energy of the car) - (friction energy) (distance).
What is the work-energy theorem?From the work-energy theorem, It is stated that The net work done is equal to the change in the kinetic energy.
[tex]\rm W_{net}=K_f-K_i[/tex]
The initial kinetic energy is [tex]\rm K_I[/tex]
The final kinetic energy is [tex]\rm K_f[/tex]
The equation equal to the work done by the engine of the car will be the subtraction of the change in kinetic energy of the car and the product of the frictional force and the distance.
[tex]\rm W_{net}=K_f-K_i - F_f \times d[/tex]
Hence option B is correct.
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The flash was running around Central City when he runs into the villain Gorilla Grodd. Gorilla Grodd releases the spring loaded trap that is underneath the Flash which propels him upwards 20 m. If the Flash has a mass of 80kg and the spring was compressed 4m, what is the constant of the rubber band?
PE = 1/2 kx²
mgh = 1/2 kx²
80.9.8.20 = 1/2 k.4²
k = 1960
Imagine that you are at the doctor's office and about to get a checkup. The doctor walks in and all of a sudden, your heart rate increases, mouth goes dry, etc. What system is causing this?
all of the above
parasympathetic nervous system
central nervous system
sympathetic nervous system
The parasympathetic nervous system and sympathetic nervous system are responsible for heart rate increasing and mouth going dry.
What is Autonomic nervous system?This is a part of the peripheral nervous system that regulates involuntary physiologic processes.
It is divided into two parts namely:
Parasympathetic nervous systemSympathetic nervous systemThey are responsible for involuntary actions which are mentioned above.
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What variables go into preventing injury ?
Answer:
Here below are some basic measures to take in order to avoid a sports injury: Make a training routine that contains exercise, strength training, and flexibility exercises. This will help to lower your risk of injury. Exercising different muscle groups every other day is a good idea.
Why is it important to oil machine regularly?
To reduce friction between the moving parts of the machine.
Science
Imagine you accidentally touched a hot stove. Explain how you
would react in the short term and long term, and describe what body
systems would be involved in your behavioral response.
Answer:
Your human reflexes would pull your arm away extremely fast, and you'd be left in pain, this is your nervous system at work. In the long term, you'd be very cautious about stoves
Explanation:
Hope this helps!
Select the correct answer. What is the main function of a telescope? A. It brings scientists closer to distant objects. B. It magnifies light received from distant objects. C. It measures the temperature of distant objects. D. It measures the wavelengths of incoming light rays.
Answer: A. It brings scientists closer to distant objects.
Explanation:
When light from infinite coming toward the lens of the telescope then this light is converge at the focal plane of the lens. This will image which is formed at the focal plane worked as an object for another lens of the telescope.
Now another lens made the final virtual image which is seen by the observer.
So here in this whole process the main working of Telescope is to form the image of a distant object near to the eye of an observer. So the light coming from the infinite distance is collected together and then a bright image is formed by that light so that observer is able to see the image clearly
so here correct answer would be
A. It brings scientists closer to distant objects.
Answer:
Answer: A. It brings scientists closer to distant objects.
Explanation:
A gust of wind blows parallel to a window with area 2.5m2.. Assume the pressure inside the house is at atmospheric pressure and that the gust reaches 30 m/s. Which answer most closely approximates the force on the window
Assuming that the pressure inside the house is at atmospheric pressure, the force on the window is approximately 1378 Newtons.
Given the data in the question;
Area of the window; [tex]A = 2.5m^2[/tex]Velocity of wind; [tex]V = 30m/s[/tex]Force on the window; [tex]F = \ ?[/tex]
ForceForce is an influence that can cause the change of motion of a particle or object. Also, force normal to the area of a surface is equal to pressure multiply by the area of that surface.
[tex]F = P * A[/tex]
Where P is pressure and A is area of the surface.
Also, we know that;
[tex]Pressure \ P = \frac{D_{air}V^2}{2}[/tex]
Where [tex]D_{air}[/tex] is density of air, approximately( [tex]1.225 kg/m^3[/tex] ) and V is velocity.
Hence
[tex]F = P * A\\\\F = \frac{D_{air}V^2}{2} * A[/tex]
We substitute our values into the equation above
[tex]F = \frac{D_{air}V^2}{2} * A\\\\F = \frac{1.225kg/m^3*(30m/s)^2}{2} * 2.5m^2\\\\F = 551.25 kg/ms^2 * 2.5m^2\\\\F = 1378.13 kgm/s^2\\\\F = 1378N[/tex]
Therefore, Assuming that the pressure inside the house is at atmospheric pressure, the force on the window is approximately 1378 Newtons.
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A meter stick with a mass of 0.65 kg is held perpendicular to a vertical wall by a cord of length d = 4.8 m attached to the end of the meter stick and also to the wall above the other end of the meter stick. (a) Determine the tension in the cord.
With the mass of the meter stick at 0.65 kg and the length of the cord at d = 4.8 m, The tension in the cord is mathematically given as
T=1.756
What is the tension in the cord.?Question Parameters:
A meter stick with a mass of 0.65 kg
a cord of length d = 4.8 m
Generally, the moment at point A is mathematically given as
mg(0.5)=[tex]tcos\theta x(1)[/tex]
[tex]Tcos\theta=0.35*9.81*0.5[/tex]
Where
[tex]\theta=sin^{-1}(1/4.8)\\\\\theta=12.02[/tex]
Hence
[tex]Tcos\theta[/tex]=0.35*9.81*0.5
Tcos(12.02)=0.35*9.81*0.5
T=1.756
In conclusion, the tension in the cord is
T=1.756
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can someone please answer this, ill give you brainliest and your getting 100 points.
Answer:
D
Explanation:
I have no explanation but it should be right just like the core of earth
Answer:
Asthenosphere
Explanation:
B is the correct option
C and D are part of earth's coreD denotes to inner coreC denotes to inner core