COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 4, Problem 79QAP
To determine
Find her speed after 25.0 s.
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1.) 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 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
Two cars descended the sloping road at an angle of 30° where When the first car stopped completely because of a red light, the second car behind it 20 meters started to brake, but did not stop immediately until it finally hit the first car in front of it. The speed at which the second car applies the brakes is 18 m/s. What is the speed of the second car just as it hits car B if the coefficient of kinetic friction is 0.4?
2.)
A crate slides down a ramp 16.98m long inclined at 30.7°. How long will it take to reach the end of the ramp? What is the velocity of the crate upon reaching the end of the ramp? Assume coefficient of kinetic friction =0.079
Chapter 4 Solutions
COLLEGE PHYSICS
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- An automobile driver traveling down an 8% grade slams on his brakes and skids 30 m before hitting a parked car. A lawyer hires an expert who measures the coefficient of kinetic friction between the tires and road to be k = 0.45. Is the lawyer correct to accuse the driver of exceeding the 25-MPH speed limit? Explain.arrow_forwardReview. A magician pulls a tablecloth from under a 200-g mug located 30.0 cm from the edge of the cloth. The cloth exerts a friction force of 0.100 N on the mug, and the cloth is pulled with a constant acceleration of 3.00 m/s2. How far does the mug move relative to the horizontal tabletop before the cloth is completely out from under it? Note that the cloth must move more than 30 cm relative to the tabletop during the process.arrow_forwardA skier weighing 90 kg starts from rest down a hill inclined at 17°. He skis 100 m down the hill and then coasts for 70 m along level snow until he stops. Find the coefficient of kinetic friction between the skis and the snow. What velocity does the skier have at the bottom of the hill?arrow_forward
- Professional Application A car moving at 10 m/s crashes into a tree and stops in 0.26 s. Calculate the force the seat belt exerts on a passenger in the car to bring him to a halt. The mass of the passenger is 70 kg.arrow_forwardA potato of mass 0.5 kg moves under Earth’s gravity with an air resistive force of −kmv. (a) Find the terminal velocity if the potato is released from rest and k = 0.01 s−1. (b) Find the maximum height of the potato if it has the same value of k, but it is initially shot directly upward with a student-made potato gun with an initial velocity of 120 m/s.arrow_forwardIf you press a book flat against a vertical wall with your hand, in what direction is the friction force exerted by the wall on the book? (a) downward (b) upward (c) out from the wall (d) into the wall.arrow_forward
- A rope exerts a constant horizontal force of 280 N to pull a 50kg crate across the floor. the velocity of the crate is observed to increase from 1m/s to 7m/s in a time of 2 seconds under the influence of this force and the frictional force exerted by the floor on the crate. What force would have to be applied to the crate by the rope in order for the crate to move with constant velocity? Explainarrow_forwardAn object is sliding across a frictionless surface at a velocity of 2.40 m/s toward the origin. When it is 6.0 m from the origin, it suddenly experiences an acceleration of -1.60 m / s. If the acceleration remains constant, what will its distance from the origin be when its velocity reaches -12.0 m/s? -80.65 m -37.2 m -40.43 m -16.40 m Next Page Page 6 of 10arrow_forwardTime left 0:1 A 40 kg box initially at rest is pushed 20.0 m along a rough, horizontal floor with a constant applied horizontal force of 170.0 N making an agle e=36.9° with the horizontal as shown in the Figure below. If the coefficient of friction between the box and the floor is µ =0.3. The final velocity V, of the box is a) 8.83 m/s b) 7.00 m/s c) 13.93 m's d) 4.28 m/s e) None Axarrow_forward
- 69. A locomotive pulls 10 identical freight cars. The force between the locomotive and the first car is 100,000 N and the acceleration of the train is 2 m/s. There is no friction to consider. Find the force between the ninth and tenth cars. SSMarrow_forwardHELP WITH PHYSICS PROBLEM A car has a mass of 1500 kg. If the driver applies the brakes, the maximum friction force that the tires can provide without skidding is about 7000N. If the car is moving at 20 m/s what is the shortest distance in which the car can stop safely?arrow_forward8. A skier starts from rest at the top of a 20° incline and skis in a straight line to the bottom of the slope, a distance d (measured along the slope) of 400 m. If the coefficient of kinetic friction between the skis and the snow is 0.2, calculate the skier's speed at the bottom of the run.arrow_forward
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Newton's Second Law of Motion: F = ma; Author: Professor Dave explains;https://www.youtube.com/watch?v=xzA6IBWUEDE;License: Standard YouTube License, CC-BY