Physics Laboratory Manual
4th Edition
ISBN: 9781133950639
Author: David Loyd
Publisher: Cengage Learning
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Chapter 7, Problem 5PLA
A 5.00 kg block rests on a horizontal plane. A force of 10.0 N applied horizontally causes the block to move horizontally at constant velocity. What is the coefficient of kinetic friction between the block and the plane? Assume g = 9.80 m/s2. Show your work.
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A person pushes a large block on a horizontal ice surface in a straight line to the right with constant speed, as shown above. The mass of the block is 10kg and frictional forces between the block and the ice are negligible. However, the block has a wide cross-sectional area such that air resistance acting on the block cannot be neglected. The opposite is true for the person: air resistance on the person is negligible, but the person’s shoes do not slip on the ice. The table shows the force exerted by the person on the block for several values of constant speed.
(a) A student claims that the data show that the magnitude of the force of air resistance is proportional to the speed of the object, within experimental uncertainty. Use physics principles to explain whether the claim is correct.
(b) As the person pushes the block, the person moves with the same constant speed as the block. Consider…
A 120 N force displaces a load with a
velocity of 15 m/s^2 in 180 s. How much
work is done upon the load?Assuming tha
force and displacement are directed
towards the East. Show your work.
FORMULAS
W=FdcosO
F=ma
Where:
m=Fla
W=work
F=force applied
d=displacement
a=F/m
v=d/t
m=mass
a=acceleration
d=vt
t=v/d
v=velocity
t=time
A bobsled zips down an ice track starting at 40 m vertical distance up the hill. Disregarding friction, what is the velocity of the bobsled at the bottom of the hill? (g = 9.81 m/s2) Show your work please.
Chapter 7 Solutions
Physics Laboratory Manual
Ch. 7 - For kinetic friction the direction of the...Ch. 7 - The two coefficients of friction discussed in this...Ch. 7 - Suppose a block of mass 25.0 kg rests on a...Ch. 7 - To measure the coefficient of kinetic friction by...Ch. 7 - A 5.00 kg block rests on a horizontal plane. A...Ch. 7 - Both types of coefficient of friction are...Ch. 7 - For either type of coefficient of friction, what...
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- Suppose that a ball decelerates from 8.0 m/s to a stop as it rolls up a hill, losing 10% of its kinetic energy to friction. Determine how far vertically up the hill the ball reaches when it stops. Show your work.arrow_forwardA rope exerts a force of 25N on a box at an angle of 34 degrees from the horizontal a)what is the horizontal component of the force on the box? B) what is the vertical component of the force on the box? Show your work.arrow_forwardJohn is sitting with his knee flexed to 90 degrees. The force of the patellar tendon is 5 N. The force of his quad is 10 N. Draw the component vectors and estimate the resultant vectors. Place the patellar tendon vector on the y-axis. Calculate the resultant vector. Show your workarrow_forward
- A car goes around a curve on a road that is banked at an angleof 33.5°. Even though the road is slick, the car will stay on theroad without any friction between its tires and the road whenits speed is 22.7 m/s. What is the radius of the curve? Show your work and explain.arrow_forwardDetermine the momentum of an object in free fall. The object bas a mass of 15 kg and is falling at a rate of 2.0 m/s. Show your work.arrow_forwardSolve each problem and show all work The Washington Monument is 555 feet tall. If 1 meter = 3.28 feet, what is the height of the Washington Monument in meters? A worker assigned to the restoration of the Washington Monument is checking the condition of the stone at the very top of the monument. A nickel with a mass of 0.005 kg is in her shirt pocket. What is the gravitational potential energy (GPE) of the nickel at the top of the monument? What is the kinetic energy (KE) of the nickel in her shirt pocket at the top of the monument? If the nickel accidentally falls out of her pocket, what will happen to the gravitational potential energy (GPE) of the nickel as it falls to the ground? If the nickel accidentally falls out of her pocket, what will happen to the kinetic energy (KE) of the nickel as it falls to the ground?arrow_forward
- Jill of the Jungle swings on a vine 6.9 m long. What is the tension in the vine if Jill, whose mass is 63 kg, is moving at 2.4 m/s when the vine is vertical? Show your work and explain.arrow_forwardTwo blocks with mass m and 2m are placed on a frictionless surface, and m is placed on top of 2m. Given the maximum static friction coefficent between two blocks is u, what is the maximum external force extered on 2m so that two blocks will move with the same acceleration? Please express in u, m and g. Show your work.arrow_forwardM Assume M=500g, 0=60 degrees, the co-efficient of static friction is 0.5, and the co-efficient of kinetic friction is 0.1. 1. Will the box slide down the ramp or not move at all? Show your work. 2. If the box slides down the ramp find the acceleration of the box 3. How fast will the box be moving when it reaches the bottom of the ramp if the box was dropped from rest from an initial height of 2m above the ground?arrow_forward
- An object moves on a flat surface with an acceleration of constant magnitude. If the acceleration is always perpendicular plane and measures the angle at which the block begins to slide. He reports that the coefficient of static friction was 0.25 in his experiments. At what angle did Leonardo’s blocks begin to slide? Show your work and explain.arrow_forwardAn astronaut with a mass of 180.0 kg is outside a space capsule when the tether line breaks. He is initially moving 0.1 m/s away from the capsule. The astronaut has a 4 kg wrench available to throw. If he throws the wrench away from the capsule at 12 m/s, what speed will the astronaut have on the way back? Show your work. (a) 0.33 m/s (b) 0.13 m/s (c) 0.17 m/s (d) 0.27 m/sarrow_forwardAnswer parts a-d for this problem and show your work.arrow_forward
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