The acceleration of gravity is 9.81 m/s 2 . answer in units of n. The minimum force required was 93.20N.
What is force?
Force is a quantitative representation of an interaction that creates a change in the motion of an item. In reaction to a force, an item may accelerate, slow down, or change direction. In other words, force is any action that tends to maintain or alter the motion of a body or distort it.
Total mass=56Kg
tied radius=0.060m
turning radius=0.35m
g=9.81m/s2
T=0.35F
where F is the force that we want
W=mg
=68Kg
W(0.060)=T=0.35F
0.060/0.35=0.171
F=0.171W
0.171(56)=9.576Kg
=93.20N
So here by the force required is=93.20N
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way?
27. What is the average acceleration of the Blue Flame speed car if its initial velocity is 1000 km/h and it
comes to a complete stop in a distance of 2.0 km?
Answer:
Explanation:
Given:
V₀ = 1 000 km/h = 1 000 000 m / 3 600 s ≈ 280 m/s
V = 0 m/s - the Blue Flame car stopped
D = 2.0 km = 2 000 m - distance
________________________________
a - ?
D = (V₀² - V²) / (2·a)
Acceleration:
a = (V₀² - V²) / (2·D)
a = (280² - 0²) / (2·2000) ≈ 20 m/s²
if the intensity of a sound increases from 1 bel (10 db) to 3 bel (30 db), what is the increase in energy per square meter?
The increase in energy is 100times.
Does distance affect the loudness of a sound?The square of the distance from the source of the sound wave determines the inverse proportionality of sound intensity. The strength of a sound wave reduces with increasing distance from the source because sound waves transmit their energy via a two-dimensional or three-dimensional medium.
A sound wave's amplitude determines its intensity, and its frequency corresponds to its rate of vibration.
Acoustic intensity, also referred to as sound intensity, is the amount of energy carried by sound waves per unit of area in a direction perpendicular to that area. The SI unit for intensity, which also includes sound intensity, is the watt per square meter (W/m²).
Mathematically, the sound intensity level can be expressed as,
β(dB) = 10log₁₀(I/I₀)
β₂-β₁ = 10log₁₀(I/I₀)
30-10 = 10log₁₀(I/I₀)
20 = 10log₁₀(I/I₀)
I/I₀ = 10²(or) 100times.
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an empty beaker is weighed and found to have a mass of 130g. a measuring cylinder contains 50cm3 of an unknown liquid. all the liquid is poured into the beaker which is again weighed and found to have a mass of 170 g. calculate the density of the liquid. pleasee with explanation)
Answer:
0.8 g/cm^3
Explanation:
mass of liquid = mass of beaker + liquid - mass of beaker
= 170g -130g = 40 g
density = mass/ volume
therefore:
density of volume = [tex]\frac{40g}{50cm^3} = 0.8 g/cm^3[/tex]
where need be for 3 significant figure or 2 decimal place, just add zeros at the back of the 8
other than 120 and 240 volts, what is another common voltage used inside a building? i. 208 ii. 277 iii. 480
Other than 120 and 240 volts, what is another common voltage used inside a building is 208,277and 480volts.
What is the standard input voltage?When the same signal is applied to the IN(+) and IN(-) terminals of an op-amp, it must operate satisfactorily within a range of input voltages known as the common-mode input voltage (CMVIN), which is described in the datasheet of the device. You may think of it as never applying common-mode signals to an op-amp.
The voltage shared by an electrical device's two input terminals is known as a common-mode signal. The common-mode signal on a transmission line in telecommunications is also referred to as longitudinal voltage. The signal is typically transmitted between two conductors using a differential voltage in electrical circuits.
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On a wet road, is a higher coefficient of friction on the tires safer or a lower one and pls explain I don’t get it
On a wet road, a higher coefficient of friction on the tires is safer as compared to a lower coefficient of friction.
What are friction and its coefficient?Friction is defined as a force that resists the sliding or rolling of one object over another object. The coefficient of friction refers to a measure of the amount of friction present between two surfaces. When you calculate a coefficient of friction, you're calculating the resistance to motion at the interface of two surfaces of materials.
On dry surfaces, you have a high coefficient of friction of about 0.9, but driving on wet roads would be dangerous because the wet road coefficient is very low about 0.1.
So we can conclude that a higher coefficient of friction is recommended for a safe journey.
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Refraction of a light ray may be defined as
A. bouncing off the boundary
B. passing through the boundary
C. maintaining speed after a boundary
D. changing direction while crossing a boundary
Answer:
Explanation:
Refraction of a light ray may be defined as:
D. changing direction while crossing a boundary
4. Predict whether a greater amount of energy will be
transferred as heat between 1 kg of water at 10 °C
and a freezer at -15 °C or between 1 kg of water at
60 °C and an oven at 65 °C.
The greater amount of energy is transferred during the first case and the difference in energies is: 84 × 10³ J
What is internal energy of a system?Internal energy refers to all energy within a particular system, including the kinetic energy of molecules and the energy stored in chemical bonds between molecules. The interaction of heat, work, and internal energy involves the transfer and conversion of energy whenever a change is made to the system.
The amount of heat (Q) gained or lost from the sample can be calculated using the formula Q = mcΔT. where m is the mass, c is the specific heat, and ΔT is the temperature change.
For the first case:
Q = mcΔT
Q = mc(T₁ - T₂)
m = 1 kg or 1000 g
c = 4.2 J g⁻¹/°C
T₁ = 10 °C
T₂ = -15 °C
Q₁ = 1000 × 4.2 × (10 -(-15))
Q₁ = 105 × 10³ J
For the second case:
Q = mcΔT
Q = mc(T₂ - T₁)
m = 1 kg or 1000 g
c = 4.2 J g⁻¹/°C
T₁ = 60 °C
T₂ = 65 °C
Q₂ = 1000 × 4.2 × (65 - 60)
Q₂ = 21 × 10³ J
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What are some applications of the field of spectroscopy? Select 5 options.
O for identifying elements in a sample
O for determining the distance and velocity of galaxies
O for producing neon lights
O for determining types of chemical bonds
O for use in medical imaging devices
O for killing bacteria in foods
Answer:
for identifying elements in a sample
for determining the distance and velocity of galaxies
for producing neon lights
for determining types of chemical bonds
for use in medical imaging devices
Explanation:
I hope this helps. :)
what is the radius of an object turn if the acceleration is 1.4m/s^2 and has a velocity of 5.3 m/s
Answer:
Radius 20 m.
Explanation:
Given:
aₙ = 1.4 m/s²
V = 5.3 m/s
___________
R - ?
Centripetal acceleration:
aₙ = V² / R
Radius:
R = V² / aₙ
R = 5.3² / 1.4 ≈ 20 m
After energy conversions, you end up with the same total amount of energy as the original amount energy. Which law explains this rule?.
The law that explains after energy conversions, the total amount of energy has the same amount as the original amount of energy is the Law of conservation of energy.
The state law of conservation of energy is that energy cannot be created, the energy cannot be destroyed, and the energy can be converted from one form of energy to another form of energy. Examples like mechanical energy. Mechanical energy is the sum of potential energy and kinetic energy.
Potential energy is the kind of energy stored by an object because of its position.Kinetic energy is the kind of energy that is possessed by an object in motion.If an apple fell from a branch of a tree
The potential energy on the branch is the maximum potential energy.When it fell, the potential energy reduces and changes into kinetic energy.When the apple almost reaches the ground, the potential energy gets smaller and the kinetic energy gets bigger.Before it hit the ground the potential energy is the minimum potential energy, but the kinetic energy reaches the maximum kinetic energy. At every point in its movement, the mechanical energy is always the same amount of energy.Learn more about Law of conservation of energy here: https://brainly.com/question/24772394
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In several sentences, describe one example of classical conditioning you have experienced or witnessed in everyday life (ex. training a pet, food dislikes due to illness, conditioned fears, etc.). Identify the unconditioned stimulus, unconditioned response, neutral/conditioned stimulus, and conditioned response in your example.
The dog that leans to associate the bell with salivation and food is a case of classical conditioning.
What is classical conditioning?The idea of classical conditioning is that the individual is able to link up the unconditioned stimulus to the conditioned stimulus. This implies that the organism has been taught to link up a particular stimulus with another.
Let us at this point recall the famous experience in the experiment of Pavlov. In this case, we know that a dog would always salivate if the dog smells the approach of food coming towards it.
Imagine that we now have to ring a bell when we are bringing the food to the dog. So much so that the dog has been able to link up the bell with the fact that the food is approaching.
It comes to a point that the dog would now salivate just at the sound of the bell even when the food is not in sight.
Hence, in this case, the unconditioned stimulus is the salivation while the conditioned stimulus is the bell that causes the salivation.
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How is it that a piece of wool can become positively charged in some situations and negatively charged in other situation?
The wool becomes positively charged because it gives up electrons to the rubber rod whereas wool is rubbed against a Nylon strip so the wool will steal electrons from the Nylon and form a negative charge.
What is the charge that occurs on wool?When the woolen cloth is stroke against the plastic, both wood and plastic get electrified due to friction built while rubbing. So, plastic has greater electron affinity (ability to attract electrons) in a contrast to wool, therefore, plastic acquires a negative charge and wool obtains a positive charge. When you rub a balloon with a cloth made of wool, the balloon captures electrons from the wool, leaving the balloon with a negative charge and the wool with a positive charge. If both balloons are pat with wool, they will both have the same charge (negative) and therefore will repel each other.
So we can conclude that Wool is a conductive material, which means it readily gives away its electrons. accordingly, when you rub a balloon on wool.
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Can a spectrophotometer be used to measure the absorption of a particular wavelength of light that is not visible to the human eye?.
Yes, a spectrophotometer can be used to measure the absorption of a particular wavelength of light that is not visible to the human eye.
What is a spectrophotometer?A spectrophotometer is an instrument used to measure the intensity of electromagnetic radiation at different wavelengths.
Spectrophotometry is a standard biological technique used to measure light absorption or the amount of chemicals in a solution. This technique uses a light beam which passes through the sample, and each compound in the solution absorbs or transmits light over a certain wavelength.
Spectrophotometry is the quantitative analysis of electromagnetic spectra by use of a spectrophotometer; especially in order to determine the structure or quantity of a substance.
Using the spectrophotometer, absorption of light can be measured, even if we cannot observe it unaided.
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10. a helium balloon is held by its string in a car with the windows rolled up. the car, initially at rest, accelerates forward. which direction does the balloon move? explain.
The helium-stuffed ball is surely transferring against the direction of what looks like gravity.
The equal thing that it does while you're not in an accelerating body. It does that for the equal motive: buoyancy because of being lighter than air. The air inside the vehicle has a higher density inside the back of the car than it does inside the front. this means that the net pressure on the balloon due to collisions with the air will be in the ahead path.
The balloon does the other to something your body could do. for that reason, if the car comes to rest the balloon moves toward the return. The secret is that the balloon is filled with helium (He) and you are made of stuff a great deal heavier than air.
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A child whose weight is 350 N swings out
over a pool of water using a rope attached
to the branch of a tree at the edge of the
pool. The branch is 10.2 m above ground
level and the surface of the water is 1.79 m
below ground level. The child holds on to a
rope of length 7.2 m attached to the branch
and moves back until the angle between the
rope and the vertical is 12◦. When the rope is
in the vertical position, the child lets go and
drops into the pool. The acceleration due to gravity is 9.81 m/s^2
Find the speed of the child at the surface of
the water.
Answer in units of m/s.
The speed of this child from this surface would be 14.69 m / s
How to solve for the speedWe have the formula for energy conservation as:
E - potential = E - kinetic
We have the following details with which we are to solve the problem
weight of child w = 350 N
length of rope L = 7.2m
angle θ = 12 degrees
we would have the solution as
m x 9.8m/s² x (10.2 + 1.79 - 7.2 x cos 12) = 1/2 mv²
we would have to solve out the expression that we have above. Such that :
9.8m * (11.99 - 0.9781) = 1/2 mv²
107.9 m = 1/2 mv²
cancel out m
107.9 = 0.5v²
divide through by 0.5
107.9 / 0.5 = v²
215.8 = v²
v = √215.8
v = 14.69
Hence the speed of the child at the surface of the water would be given as 14.69 m / s
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What wavelength is the maximum absorbance observed in the spectrum displayed in figure 10. 11? report your answer using 3 significant figures.
The spectrum shown has a maximum absorption of 278.4 nm.
The absorbance between 400 and 650 nm is measured, often at intervals of 25 nm, to identify the wavelength of maximum absorption. To identify the wavelength of greatest absorption, the data can be analyzed or graphed.
The useful absorbance range for the majority of spectrometers and colorimeters is between 0.1 and 1. Values of absorbance more than or equal to 1.0 are excessive. Your solution is overly concentrated if the absorbance readings you are getting are 1.0 or higher.
Maximum Absorbance refers to an area with the highest absorbance level. We can infer from the graph that the absorbance is at its highest at wavelength 278.45 nm.
Therefore, maximal absorbance occurs at 278.4 nm wavelength.
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How much energy is needed to raise the temperature of 0, point, 20, k, g,0.20kg of cooking oil by 50, degrees if the specific heat capacity of this oil is 1800, j, slash, left bracket, k, g, degrees, c, right bracket,1800j/(kg
Answer:
See below
Explanation:
1800 j/(kg C) = x J / (.20 kg * 50 C)
solve for x J = 180 000 J
The amount of energy needed to raise the temperature of 0.20 kg of cooking oil by 50°C is 18000 J.
What is the amount of energy?The amount of energy (Q) needed to raise the temperature of a substance can be calculated using the formula:
Q = mcΔT
where Q is the amount of energy, m is the mass of the substance, c is the specific heat capacity of the substance, and ΔT is the change in temperature.
In this case, the mass of the cooking oil is 0.20 kg, the specific heat capacity of the oil is 1800 J/(kg·°C), and the temperature needs to be raised by 50°C. Substituting these values into the formula, we get:
[tex]Q = (0.20 kg) x (1800 J/(kg·°C)) x (50°C)[/tex]
Q = 18000 J
Therefore, the amount of energy needed to raise the temperature of 0.20 kg of cooking oil by 50°C is 18000 J.
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The graph shows distance versus time for an object.
Which of the following correctly describes the object's motion?
The object is moving with increasing acceleration.
The object is moving with constant acceleration.
The object is moving with increasing velocity.
The object is moving with constant velocity.
The velocity of an object is the ratio of distance to the time. The graph shows, an increase in distance with the increase in time. This linearity make the velocity constant. Hence, the option D is correct.
What is velocity?Velocity of a substance is the measure of distance travelled per unit time. Thus it is the ratio of distance to time.In physics, velocity is the rate of speed.
Velocity = distance/time.
Hence, as the time taken for the travel increases velocity will decreases. In the given graph at each point distance shows linear relation with the time and it obtains a straight line.
Therefore, the distance is increasing with increase in time means the velocity is not changing and it remains constant. Hence, option D is correct.
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these stick figures are each in a hurry to catch a flight. they are both walking at a speed of 1 m/s on a walkway that has a velocity of 0.5 m/s to the west. explain which stick figure is moving more quickly relative to the ground.
The stick figure that is walking at a velocity of 1 m / s to the west is moving quickly relative to the ground than the stick figure that is walking at a velocity of 1 m / s to the east.
Vsg = Vsw + Vwg
Vsg = Relative velocity of stick figure wrt ground
Vsw = Relative velocity of stick figure wrt walkway
Vwg = Relative velocity of walkway wrt ground
Let the stick figure that is walking to the west be A and the stick figure that is walking to the east be B.
For A,
Vsw = - 1 m / s
Vwg = - 0.5 m / s
Vsg = - 1 - 0.5
Vsg = - 1.5 m / s
For B,
Vsw = 1 m / s
Vwg = - 0.5 m / s
Vsg = 1 - 0.5
Vsg = 0.5 m / s
The negative symbol indicates direction. So Vsg for A > Vsg for B
Therefore, the stick figure that is walking at a velocity of 1 m / s to the west is moving quickly relative to the ground than the stick figure that is walking at a velocity of 1 m / s to the east.
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a horizontal force is applied to a glider moving along a horizontal air track bringing it to a stop in t seconds. if the same force is applied to a second glider with half the mass and four times the initial velocity, how long does it take for the glider to come to a stop?
The second glider will stop after it travels the distance of 8 times the distance of the first glider.
Let subscript 1 and 2 represent parameters related to glider 1 and glider 2.
According to the Newton's law:
F = m . a
Where:
F = force
m = mass
a = acceleration
Since both gliders received the same forces,
F₁ = F₂
m₁ . a₁ = m₂ . a₂
m₁ . a₁ = 1/2m₁ . a₂
a₂ = 2a₁
Hence, the acceleration of the 2nd glider is twice of that of the 1st glider.
Velocity formula for decelerated move
v² = u² - 2.a.s
Where:
v = final velocity
u = initial velocity
s = distance.
Since the gliders stop, v = 0
Hence,
u₁² = 2.a₁.s₁
u₂² = 2.a₂ . s₂
Substitute u₂ = 4u₁, a₂ = 2a₁
(4u₁)² = 2.(2a₁) . s₂
16 u₁² = 4 a₁ . s₂
16. (2.a₁.s₁) = 4 a₁ . s₂
s₂ = 8 s₁
Hence, the distance of glider 2 is 8 times the distance of glider 1
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Major activity injuries include
Bone breaks
Concussions
Joint Dislocations
All of the above
Explanation:
Major activity injuries include:
Bone breaksConcussionsJoint DislocationsAll of the aboveAnsver:
All of the above
question: if so, what is the star's average absolute magnitude (m) (think average luminosity) to 0.01 magnitudes? (1 point)
Mv is equal to m - 2.5 log(d/10)2. There is a minus sign in the expression because stars distant than 10 pc have Mv that is more negative than m. Make careful you provide the star's given distance in parsecs (1 pc = 3.26 ly = 206265 AU) if you use this formula.
The moon can appear to be nearly -13 magnitude bright, the moon can appear to be -6 magnitude bright, and stars can get as bright as nearly -1.5 magnitude.
The star's actual magnitude is determined by subtracting its apparent magnitude by five times the trigonometric parallax of its distance from the star.
First-magnitude stars have apparent magnitudes less than +1.50, making them the brightest stars in the night sky. In the first century B.C., Hipparchus invented the magnitude scale. He assigned first magnitude to the 20 brightest stars and sixth magnitude to the stars that are faint enough to be seen with the unaided eye.
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Which two measurements are needed in order to calculate the speed of an object in motion?.
The two measurements, which are needed in order to calculate the speed of an object in motion, be: amount of distance travelled at a particular time interval and the time interval.
What is speed?Speed is characterised as the rate at which an object's position changes in any direction.
The distance travelled in relation to the time it took to travel that distance is how speed is defined. Since speed simply has a direction and no magnitude, it is a scalar quantity. SI unit of speed be meter/second.
The equation provides the speed formula: s = d/t
Where,
the speed in m.s^-1 is s.
The distance in m is represented by d.
The time interval in s is t.
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If it took Beth 2 hours to drive her truck 60 miles, what was her average speed?
Explain, using words, the steps you took to calculate Beth's average speed.
What are some objects that have faster or slower average speeds than Beth's truck?
what is the wavelength range in an am radio band (with frequency range 563 khz1649 khz)? answer in units of m.
Amplitude modulated (AM radio) carrier frequencies lie in the frequency range 535 to 1605 kHz. Carrier frequencies from 540 to 1600 kHz are assigned in 10 kHz increments.
So for the maximum wavelength, the speed of light divided by the minimum frequency of FM, which is 88 megahertz, is 3.41 meters. The minimum wavelength is 10 to the power of 8 meters divided by 108 megahertz. Therefore, FM wavelengths are between 2.78 meters and 3.41 meters. Since they are electromagnetic waves, they travel at the speed of light and their wavelength is given by the relationship ν = c/λ. where c is the speed of light. The wavelength of a 1,000 kHz radio wave is (2.998 × 108 m/s)/(1.000 × 106/s) = 299.8 m.
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The relationship of kinetic energy is that when ____________ increases or ____________ increases, kinetic energy will increase also.
Answer: thermal energy, density
Explanation:
The relationship of kinetic energy is that when mass increases or velocity increases, kinetic energy will increase also.
Kinetic energy equals half of the product of mass and the square of the velocity. Kinetic energy is the energy that occurs when the body is in motion. The unit of kinetic energy is joule (J). The kinetic energy increases with an increase in mass and the square of velocity.
The kinetic energy also increases with an increase in the thermal energy of the particles. When the temperature increases, the average kinetic energy also increases and hence, the thermal energy of the molecules also increases. The kinetic energy increases with the decrease in density or volume of the object.
Hence, Kinetic energy increases with an increase in the mass of the object and the velocity of the object.
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four resistors having a value of 100 ohms each are connected in parallel. what is the total resistance of the circuit?
The total resistance of the circuit is 25 ohms.
How can the resistance of a circuit with four resistors in parallel be determined?In the same way, if three or more resistors of the same value are connected in parallel, the equivalent resistance will be equal to R/n, where R is the resistor's value and n is the total number of resistors in the arrangement.
How do you calculate a parallel resistor's total resistance?The total current flowing from the source is the sum of the currents through each of the paths. Using the following formula, you can get the overall resistance in a parallel circuit: 1/Rt = 1/R1 + 1/R2 + 1/R3 +... Even if one of the parallel channels breaks, current will still flow.
[tex]R_{total}[/tex] = 100/4 = 25ohms
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which is greater, the force of her finger on the table, or the force of the table back on her finger?
More force is exerted by the table against her finger than she exerts against the surface.
Explain about the Force?Active power is the force behind motion or change that is exerted or brought to bear. the elements of nature
The term "force" has a clear definition in science. It is quite acceptable to refer to a force of this level as a push or a pull. An object does not "have in it" or "contain" a force. One thing is subject to a force from another. There is no distinction between living and non-living things in the concept of a force.
The newton is the SI unit of force. As they relate to force, the base units are: The symbol for the length measurement known as the meter is m. The symbol for the kilogram, a unit of mass the sign s represents the second, a unit of time.
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) a 45 kg box is pulled horizontally across the floor will a force directed horizontally to the left with a magnitude of 200.0n. (a) what is the acceleration of the box if the coefficient of kinetic friction is 0.10? (b) if the box starts from rest, how fast will it be moving at 3.0 s assuming the constant force is applied for the entire 3.0s?
The acceleration of the box is 3.4m/s² and if the box starts from rest at constant force for 3 seconds, then the speed of the box will be 10.2m/sec
The frictional force (f) = μN
where μ= coefficient of kinetic friction
N = Normal force = mg
The given value for μ = 0.10
∴ f = 0.10 × 45 × 10
f = 45 N
Hence F net = applied force - frictional force
F net = 200 - 45
F net = 155N
Thus, the acceleration of box (a) will be, F = ma
where m = mass of box =45kg
a = F /m
a = 155/45
a = 3.4 m/s²
a) Hence acceleration of the box pulled horizontally is 3.4m/s²
The speed of the box pulled, if initially the box was at rest and constant force is applied for 3 seconds,
v = u + at
v = 0 + 3.4 × 3
v = 10.2 m/s
b) Hence, the speed of the box at constant force is 10.2m/s
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a 39-kg crate rests on a horizontal floor, and a 68-kg person is standing on the crate. (a) determine the magnitude of the normal force that the floor exerts on the crate. n (b) determine the magnitude of the normal force that the crate exerts on the person.
The floor normally presses down on the carton with a force of 1049.67N.
The box normally applies 667.08 N of force to the person.
What do you mean by normal reaction force?A perpendicular force that acts on two surfaces that are touching. It stands in for the pressure pressing the two surfaces together. With the size of the usual response force, the value of limiting friction grows. If the weight is the only vertical force acting on an object that is lying or moving on a horizontal surface, While acting in the opposite direction from the weight, the normal response force is of identical size. Raising the weight results in increased friction.
Given,
The crate's mass, mp=68kg, is maintained on a horizontal floor.
mc=39kg is the mass of the guy standing above the crate.
(a) determine the normal force the floor applies to the crate:
N =(mc+mp)g
N =(39kg+68kg)×9.81m/s²
N = 1049.67kg⋅m/s² [tex]\frac{1N}{1Kg.m/s^{2} }[/tex]
N = 1049.67N
∴ The floor normally presses down on the carton with a force of 1049.67N.
(b) determine the typical force the crate would apply to the person:
N = mp g
N = 68kg×9.81m/s²
N = 667.08m/s² [tex]\frac{1N}{1Kg.m/s^{2} }[/tex]
N = 667.08 N
∴ The box normally exerts 667.08 N of force on the person.
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