Physics for Scientists and Engineers
6th Edition
ISBN: 9781429281843
Author: Tipler
Publisher: MAC HIGHER
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Chapter 4, Problem 28P
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In attempting to pass the puck to a teammate, a hockey player gives it an initial speed of 2.43 m/s. However, this speed is inadequate to
compensate for the kinetic friction between the puck and the ice. As a result, the puck travels only one-half the distance between the
players before sliding to a halt. What minimum initial speed should the puck have been given so that it reached the teammate,
assuming that the same force of kinetic friction acted on the puck everywhere between the two players?
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A 7-kg toboggan is kicked on a frozen pond, such that it acquires a speed of 2.1 m/s to the right. The coefficient of friction between the pond and the toboggan is 0.17. Determine the distance that the toboggan slides before coming to rest.
A flatbed truck is travelling at a constant speed of 60kph up the 15% grade when 100 kg crate which it carries is given a shove which imparts to an initial relative velocity x= 3m/s towards the rear of the truck. If the crate slides a distance x=2m measured on the truck bed before coming to rest on the bed,
a) Compute the acceleration of the block.
b) Compute the coefficient of kinetic friction between the crate and the truck.
c) Compute the time it takes fo the crate to move a distance of 2 m.
Chapter 4 Solutions
Physics for Scientists and Engineers
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- A flatbed truck is traveling at a constant speed of 60kph up the 15% grade when 100 kg crate which it carries is given a shove which imparts to an initial relative velocity x= 3m/s towards the rear of the truck. If the crate slides a distance x=2m measured on the truck bed before coming to rest on the bed, a)Compute the acceleration of the block. b)Compute the coefficient of kinetic friction between the crate and the truck. c)Compute the time it takes for the crate to move a distance of 2 m.arrow_forwardThe brakes on a big truck fail and it is forced to use a runaway truck lane. The lane is perfectly horizontal, and full of deep gravel, creating a coefficient of kinetic friction between the truck and the gravel of 0.80. The truck enters the lane at moving 35 m/s (about 80 mph). How far does the truck travel before it stops?arrow_forwardA car drives onto a section of the road which is covered in ice. The driver attempts to stop by hitting the brakes but the wheels lock and the car skids for another 60 m. Determine the coefficient of kinetic friction between the wheels and the ice if the initial speed of the car was 40 km/hr.arrow_forward
- A crate rests on the flatbed of a truck that is initially traveling at 15 m/s on a level road. The driver applies the brakes and the truck is brought to a halt in a distance of 38 m. If the deceleration of the truck is constant, what is the minimum coefficient of friction between the crate and the truck that is required to keep the crate from sliding?arrow_forwardA hockey puck is struck and is given an initial speed of 20 m s-1 on a frozen lake. The puck remains on the ice and slides 1.2x102 m, slowing down steadily until it comes to rest. Draw a diagram of any forces acting on the puck during its slowing motion and then determine the coefficient of sliding friction between the puck and the ice.arrow_forwardThe force F, acting in a constant direction on the 17-kg block, has a magnitude which varies with the position s of the block. When s = 0 the block is moving to the right at v = 6 m/s. The coefficient of kinetic friction between the block and surface is μk = 0.3 a) Determine how far the block must slide before its velocity becomes 15 m/s.arrow_forward
- Police examine the scene of an accident involving two cars, which is parked. The skid marks of the moving car, which nearly came to a stop before the collision, is 80 meters long. The coefficient of kinetic friction between rubber and the pavement is about 0.80. Estimate the initial speed of the car.arrow_forwardA man has to push his boat on the shore across the mud to get to the water. The coefficient of friction between the boat and the mud is given by μ = 0.400. If the boat has a mass of 40 kg, calculate the magnitude of the force of friction acting on the boat.arrow_forwardFriction can be helpful in some situations but cause in other situations. (a) Describe two situations in which friction is helpful for an object moving on a horizontal surface.(b) Describe two situations in which it would be ideal if there were no friction when an object moves across a horizontal surface.arrow_forward
- The coefficient of static friction between a persons shoe and the ground is 0.80. Determine the maximum magnitude of acceleration of a 60 kg person, if he starts running on a horizontal surface from rest.arrow_forwardSuppose a box of mass m = 5 kg is kicked and given an initial velocity of 4.0 m/s to the right. The box slides along and is brought to rest by friction. What is its total displacement, assuming the coefficient of kinetic friction is 0.60?arrow_forwardA skater with an initial speed of 6.80 m/s stops propelling himself and begins to coast across the ice, eventually coming to rest. Air resistance is negligible. (a) The coefficient of kinetic friction between the ice and the skate blades is 0.0700. Find the deceleration caused by kinetic friction. (b) How far will the skater travel before coming to rest?arrow_forward
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