COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 5, Problem 22QAP
To determine
Frictional force between the crate and the belt
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A shopper pushes a 7.4 kg cart at constant of 1.20 m/s speed along a
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Captain Jack Sparrow is pushing a treasure chest across the wooden deck of his trusty ship, The Black Pearl. The chest is much shorter than he is, so his applied force makes an angle of 55.0° below the horizontal. The coefficient of kinetic friction between the chest and the deck has a value of 0.366, and the chest has a mass of 219 kg.
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A 50-kg box is resting on a horizontal floor. A force of 250 N directed at an angle of 30.0° below the horizontal is applied to the box. The coefficient of static friction between the box and the surface is 0.40, and the coefficient of kinetic friction is 0.30. What is the force of friction on the box?
Chapter 5 Solutions
COLLEGE PHYSICS
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- A sleigh is being pulled horizontally by a train of horses at a constant speed of 8.05 m/s. The magnitude of the normal force exerted by the snow-covered ground on the sleigh is 6.37 103 N. a. If the coefficient of kinetic friction between the sleigh and the ground is 0.23, what is the magnitude of the kinetic friction force experienced by the sleigh? b. If the only other horizontal force exerted on the sleigh is due to the horses pulling the sleigh, what must be the magnitude of this force?arrow_forwardA block of ice (m = 15.0 kg) with an attached rope is at rest on a frictionless surface. You pull the block with a horizontal force of 95.0 N for 1.54 s. a. Determine the magnitude of each force acting on the block of ice while you are pulling. b. With what speed is the ice moving after you are finished pulling? Repeat Problem 71, but this time you pull on the block at an angle of 20.0.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 75.0-g arrow, fired at a speed of 110 m/s to the left, impacts a tree, which it penetrates to a depth of 12.5 cm before coming to a stop. Assuming the force of friction exerted by the tree is constant, what are the magnitude and direction of the friction force acting on the arrow?arrow_forwardA crate remains stationary after it has been placed on a ramp inclined at an angle with the horizontal. Which of the following statements must be true about the magnitude of the frictional force that acts on the crate? (a) It is larger than the weight of the crate. (b) It is at least equal to the weight of the crate. (c) It is equal to sn. (d) It is greater than the component of the gravitational force acting down the ramp. (e) It is equal to the component of the gravitational force acting down the ramp.arrow_forwardThe drag coefficient C in FD=12CAv2 (Eq. 6.5) depends primarily on the shape of the object. You already have developed an intuition about what shapes correspond to a low C by observing the shapes of aerodynamic cars, boats, and even bullets. Which object, a sphere or a cube, would have a larger drag coefficient, assuming they are nearly the same size? Explain your reasoning. What aspect of an object most determines its drag coefficient?arrow_forward
- A 13 g bullet pierces a sand bag 32 cm thick. If the initial velocity of the bullet was 68 m/s and it emerged from the sandbag with 18 m/s what is the average magnitude of the frictional force the bullet experienced while it travelled through the sand bag? 28 N 0.87 N 87 N 8.7 Narrow_forwardA rope attached to an engine pulls a 839 N crate up an 18.0° ramp at constant speed. The coefficient of kinetic friction for the surfaces of the crate and ramp is 0.19. What is the magnitude of the force that the rope exerts on the crate parallel to the ramp?arrow_forwardA rock rests on a horizontal plane. The plane is slowly tilted so that the angle between the surface and the horizontal increases to 20 degrees, at which point the rock is about to slip. What is the coefficient of static friction between the rock and the surface, to two significant figures? O 0.36 2.2 3.4 9.4 O 13 Oarrow_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 is the magnitude of the frictional force acting on the crate?arrow_forwardA sled is held on an inclined plane by a cord pulling directly up the plane. The sled is to be on the verge of moving up the plane. The magnitude F required of the cord's force on the sled is plotted versus a range of values for the coefficient of static friction between sled and plane. The values are below: F1 = 2.0 N, F2 = 5.0 N for a coefficient of static friction is 0.25. At what angle (in degrees) is the plane inclined? F F -Hsarrow_forwardA 20-kg box of oranges slides from rest down a frictionless incline from a height of 5.0 m. A constant frictional force, introduced at point A, brings the block to rest at point B, 19 m to the right of point A. What is the coefficient of kinetic friction, Hk, of the surface from A to B? 5.0 m A 19 m 0.11 0.52 0.26 0.33 0.47arrow_forward
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