COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 4, Problem 38QAP
To determine
The maximum tension in the cable that supports a typical elevator
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Estimate the maximum tension ?T in the cable that supports a typical elevator
A 100-lb force acts as shown on a 300-lb crate placed on an inclined plane. The coefficients of friction between the crate and the plane are µs= 0.25 and µk= 0.20. Determine whether the crate is in equilibrium,and find the value of the friction force.
Estimate the magnitude of the normal force acting on an apple that rests on a flat surface.
Estimate the magnitude of the normal force on the apple when the surface is tilted at an angle of 29∘ with respect to the horizontal.
Chapter 4 Solutions
COLLEGE PHYSICS
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- Find the tension in each of the three cables supporting the traffic light if it weighsarrow_forwardIf an object is in equilibrium there must be an even number of forces acting on it.arrow_forwardA crate of mass 100.0 kg rests on a rough surface inclined at an angle of 37.0with the horizontal. A massless rope to which a force can be applied parallel to the surface is attached to the crate and leads to the top of the incline. In its present state, the crate is just ready to slip and start to move down the plane. The coefficient of friction is 80of that for the static case. (a) What is the coefficient of static friction? (b) What is the maximum force that can be applied upward along the plane on the rope and not move the block? (c) With a slightly greater applied force, the block will slide up the plane. Once it begins to move, what is its acceleration and what reduced force is necessary to keep it moving upward at constant speed? (d) If the block is given a slight nudge to get it started down the plane, what will be its acceleration in that direction? (e) Once the block begins to slide downward, what upward force on the rope is required to keep the block from accelerating downward?arrow_forward
- We know from studying friction forces that static friction increases with increasing normal force between the surfaces, which becomes important for vehicles traveling on icy or snowy roads that have coefficients of static friction much smaller than those of dry pavement. In particular, the greater the normal force on the drive wheels (those coupled to the engine), the better the traction. The horizontal position of the center of mass of a typical compact automobile is located 1.1 m toward the rear as measured from the front wheel axle. The wheelbase (distance from the front wheel axle to the rear wheel axle) is 2.7 m. Assume the car is stationary on level ground and has a weight of 12,000 N. Determine the total normal force on the two front tires and on the two rear tires. Which do you suppose are the drive wheels in this case?arrow_forwardTwo identical strings making an angle of = 30.0 with respect to the vertical support a block of mass m = 15.0 kg (Fig. P4.32). What is the tension in each of the strings?arrow_forwardJamal and Dayo are lifting a large chest, weighing 207 lb, by using the two rope handles attached to either side. As they lift and hold it up so that it is motionless, each handle makes a different angle with respect to the vertical side of the chest (Fig. P5.76). If the angle between Jamals handle and the vertical side is 25.0 and the angle between Dayos handle and the vertical side of the chest is 30.0, what are the tensions in each handle? FIGURE P5.76arrow_forward
- A woman uses a rope to pull a block of mass m across a level floor at a constant velocity. The coefficient of kinetic friction between the block and the floor is k. The rope makes an angle with the floor. Find an algebraic expression for the tension in the rope in terms of the parameters listed in the problem and any constants.arrow_forwardA uniform 25.0 kg chain 2.00 m long supports a 50.0 kg chandelier in a large public building. Find the tension in (a) the bottom link of the chain, (b) the top link of the chain, and (c) the middle link of the chain.arrow_forwardA box rests on a 20 degree incline with a coefficient of friction 0.4. Calculate the magnitude of the acceleration of the box down the ramparrow_forward
- A book sits on a horizontal top of a car as the car accelerates horizontally from rest. If the static coefficient of friction between car top and book is 0.45, what is the maximum acceleration that car can have if the book is not slip?arrow_forwardIf a box on a horizontal surface has an externally applied horizontal force less than the maximum static frictional force, the box has a motion relative to the surface equal to?arrow_forwardA uniform 25.0 kg chain 2.00 m long supports a 50.0 kg chandelier in a large public building. Find the tension in (a) the bottom link of the chain, (b) the top link of the chainarrow_forward
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