Physics Fundamentals
2nd Edition
ISBN: 9780971313453
Author: Vincent P. Coletta
Publisher: PHYSICS CURRICULUM+INSTRUCT.INC.
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Chapter 5, Problem 15P
To determine
To Calculate: The speed of the puck.
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The 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?
Express answers in significant figures and scientific notation only.
An athlete slides down from rest 40.0 meter along an icy hill which is 35 degrees from the horizontal. He then continues sliding on the level ice.
a) If the coefficient of kinetic friction between the athlete and ice is 0.20 (neglect air resistance) find speed (m/s) of the athlete at the foot of the plane.
b) find the distance (m) from the foot of the plane to the point where he has landed to the level ice
A 1370-kg car is skidding to a stop along a horizontal surface. The car decelerates from 27.6 m/s to a rest position in 3.15 seconds. Assuming negligible air resistance, determine the coefficient of friction between the car tires and the road surface.
Chapter 5 Solutions
Physics Fundamentals
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- A hockey puck struck by a hockey stick is given an initial speed y in the positive x-direction. The coefficient of kinetic friction between the ice and the puck is µz. (a) Obtain an expression for the acceleration of the puck. (b) Use the result of part (a) to obtain an expression for the distance d the puck slides. The answer should be in terms of the variables , lp and gonly.arrow_forwardA hockey puck is hit on a frozen lake and starts moving with a velocity of 22.0 m/s. It travels across the ice and 12.0s later, the velocity is 6.2 m/s. What is the coefficient of friction between the puck and the ice?arrow_forwardA car with a mass of 1.3x10° kg is skidding to a stop along a horizontal surface. The car decelerates from 33 m/s to rest in 3.9 seconds. Assuming negligible air resistance, determine the coefficient of friction between the car tires and the road surface.arrow_forward
- A hockey puck (mass = 3.5 kg) leaves the players stick with a speed of 18 m/s and slides on the ice before coming to rest.The coefficient of friction between the puck and the ice is 0.3.How long will the puck slide after leaving the players stick? (what amount of time will it be sliding)arrow_forwardAfter rounding second base, a baseball player with a mass of 77 kg slides into third base. The coefficient of kinetic friction between the player and the ground is 0.42. What is the magnitude of the friction force acting on the player? If it takes 1.3 s for the player to come to a rest at the base, what was his velocity when he initiated his slide?arrow_forwardA 2540 kg test rocket is launched vertically from the launch pad. Its fuel (of negligible mass) provides a thrust force such that its vertical velocity as a function of time is given by v(t) = At + Bt2, where A and B are constants and time is measured from the instant the fuel is ignited. The rocket has an upward acceleration of 1.50 m/s2 at the instant of ignition and, 1.00 s later, an upward velocity of 2.00 m/s. (a) Determine A and B, including their SI units. (b) At 4.00 s after fuel ignition, what is the acceleration of the rocket, and (c) what thrust force does the burning fuel exert on it, assuming no air resistance? Express the thrust in newtons and as a multiple of the rocket’s weight. (d) What was the initial thrust due to the fuel?arrow_forward
- A hockey puck is sliding across a level frozen pond with an initial speed of 7.9 m/s. Friction is NOT negligible, and it comes to rest after sliding a distance of 29.183 m. What is the coefficient of kinetic friction between the puck and the ice?arrow_forwardA 129 kg crate is sitting at the top of a ramp, which is inclined at an angle of 20 degrees with respect to the horizontal. Someone gives the crate a quick shove to get it moving, after which it slides down the ramp without any further assistance. The coefficient of kinetic friction between the crate and the ramp is ls = 0.23. What is the magnitude of the acceleration (in m/s?) of the crate?arrow_forwardA hockey puck struck by a hockey stick is given an initial speed v0 in the positive x-direction. The coefficient of kinetic friction between the ice and the puck is μk. (a) Obtain an expression for the acceleration of the puck. (b) Use the result of part (a) to obtain an expression for the distance d the puck slides. The answer should be in terms of the variables v0μk, and g only.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 penguin slides at a constant velocity of 1.4m/s down an inclined sandy scarface. The incline slopes above the horizontal at an angle of 6.9degrees.At the bottom of the incline, the penguin slides onto a horizontal patch of sand. The coefficient of kinetic friction between the penguin and the sand is the same for the horizontal patch. Calculate how much time is required for the penguin to slide to a halt after entering the horizontal patch of ice.arrow_forwardConsider a wooden ramp angled 38.6 degrees above horizontal. If a 15.5-kg wooden block is given a strong shove up the ramp so that it has an initial velocity of 3.73 m/s, how long (in seconds) will it take the block to reach its maximum height (before it starts sliding down)? The coefficient of kinetic friction between the block and the ramp is 0.369.arrow_forward
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