COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 5, Problem 52QAP
To determine
Draw the free body diagram for the situation given.
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A 50.0-kg crate rests on the bed of a truck. The coefficients of friction between the surfaces are μk=0.300 and μs=0.400. Find the frictional force on the crate when the truck is accelerating forward relative to the ground at (a) 2.00 m/s2, and (b) 5.00 m/s2.
In 1988, a very large telephone constructed by a Dutch telecommunications company was demonstrated in the Netherlands. Suppose this telephone is towed a short distance by a horizontal force equal to 8670 N, so that the telephone’s net acceleration is 1.30 m/s2.Given that the coefficient of kinetic friction between the phone and the ground is 0.120, calculate the mass of the telephone.
Also draw free body diagram. The bar in problem 5-39 .
Chapter 5 Solutions
COLLEGE PHYSICS
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- A 12-kg crate rests on a horizontal surface and a boy pulls on it with a force that is 30◦ belowthe horizontal. If the coefficient of static friction is 0.40, the minimum magnitude force heneeds to start the crate moving is: Choices: 54N 47N 71N 44N 56N Show complete solution and free body diagramarrow_forwardA 6.63-kg object is situated at rest on a horizontal surface with a static friction coefficient of 0.33. Calculate the maximum force of the static friction.arrow_forwardConsider the system shown in Fig. E5.34. Block A weighs 45.0 N, and block B weighs 25.0 N. Once block B is set into downward motion, it descends at a constant speed. (a) Calculate the coefficient of kinetic friction between block A and the tabletop. (b) A cat, also of weight 45.0 N, falls asleep on top of block A. If block B is now set into downward motion, what is its acceleration (magnitude and direction)arrow_forward
- A 30.0 kg box is pulled along a horizontal surface by a force of 150 N applied at a 30° above the horizontal. Assuming a coefficient of kinetic friction of 0.15, draw the free body diagram and then calculate the acceleration of the box.arrow_forwardA boy of mass 60 kg is standing stationary with respect to a treadmill accelerating at 2 m s-2. Find the net force on the boy. Also, if the coefficient of static friction between the boy’s sneakers and the treadmill is 0.3, up to what acceleration of the treadmill can the boy be stationary with respect to the treadmill?arrow_forwardA student decides to move a box of books into her dormitoryroom by pulling on a rope attached to the box. Shepulls with a force of 80.0 N at an angle of 25.0° above thehorizontal. The box has a mass of 25.0 kg, and the coefficientof kinetic friction between box and floor is 0.300.(a) Find the acceleration of the box. (b) The student nowstarts moving the box up a 10.0° incline, keeping her 80.0 Nforce directed at 25.0° above the line of the incline. Ifthe coefficient of friction is unchanged, what is the newacceleration of the box?arrow_forward
- Explain how the acceleration of an object is determined by the net external force on the object and the object’s mass?arrow_forwardConsider the system shown in Fig. E5.34. Block A weighs45.0 N, and block B weighs 25.0 N. Once block B is set into downwardmotion, it descends at a constant speed. (a) Calculate the coefficientof kinetic friction between block A and the tabletop. (b) A cat, also ofweight 45.0 N, falls asleep on top of block A. If block B is now set intodownward motion, what is its acceleration (magnitude and direction)?arrow_forwardOne 3.6-kgkg paint bucket is hanging by a massless cord from another 3.6-kgkg paint bucket, also hanging by a massless cord. a) If the two buckets are pulled upward with an acceleration of 1.25 m/s^2 by the upper cord, calculate the tension in the top cord. b) If the two buckets are pulled upward with an acceleration of 1.25 m/s^2 by the upper cord, calculate the tension in the bottom cord.arrow_forward
- The two blocks shown below have the mass of m1 = 4.0 kg and m2 = 1.0 kg. Determine the largest force P such that m2 will not slip on m1. The coefficients of static and kinetic friction between the contacting surfaces (m1-m2, and m1-ground) are µs = 0.5 and µk = 0.4, respectively. Hint: You should consider the free-body-diagram for each object.arrow_forwardConstruct free-body diagrams for the following physical situations. a. A downward moving elevator (held by a cable) slows down. b. A 25.0-N force is applied at a 30-degree angle to a crate in order to accelerate it rightward across a rough, horizontal surface.arrow_forwarda 25.0 kg object accelerates from rest to 0.450 m/s in 1.30 second if the coefficient of friction between the object and the floor is 0.150, find the force that can accelerates itarrow_forward
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