COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 5, Problem 72QAP
To determine
External force needed to push the box upward in a constant velocity along the metal ramp.
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The uniform crate has a mass of 150 kg. If the coefficient of static friction between the crate and the floor is us = 0.2, determine the smallest mass of the man so he can move the crate. The coefficient of static friction between his shoes and the floor is us = 0.45.
Assume the man exerts only a horizontal force on the crate
2.4 m
1.6 m
-1.2 m-
8-63. Determine the smallest force P that will cause
impending motion. The crate and wheel have a mass of
50 kg and 25 kg, respectively. The coefficient of static
friction between the crate and the ground is , = 0.2, and
between the wheel and the ground, = 0.5.
*8-64. Determine the smallest force P that will cause
impending motion. The crate and wheel have a mass of
50 kg and 25 kg. respectively. The coefficient of static
friction between the crate and the ground is , = 0.5, and
between the wheel and the ground μ = 0.3.
O
O
O
127
10
L
C
A
300 mm
3- The student pushes horizontally on a 37 kg box with a force of 115 N.
The coefficient friction between the box and the floor is 0.37. What is the
frictional force on the crate from the floor?
a- 115 b- 230 c-110
d-121
Chapter 5 Solutions
COLLEGE PHYSICS
Ch. 5 - Prob. 1QAPCh. 5 - Prob. 2QAPCh. 5 - Prob. 3QAPCh. 5 - Prob. 4QAPCh. 5 - Prob. 5QAPCh. 5 - Prob. 6QAPCh. 5 - Prob. 7QAPCh. 5 - Prob. 8QAPCh. 5 - Prob. 9QAPCh. 5 - Prob. 10QAP
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- If 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_forward27 - A diver with a mass of 70 kg jumps from the 10.0 meter high tower for a direct-vertical dive. Its movement ends at 2.50 meters below the water level. Find the average drag force exerted by the water on the diver. A) 1.05 kN B) 4.12 kN C) 3.09 kN D) 5.34 kN E) 1.50 kNarrow_forwardIn a pickup game of dorm shuffleboard, students crazed by final exams use a broom to propel a calculus book along the dorm hallway. If the 3.5 kg book is pushed from rest through a distance of 0.83 m by the horizontal 31 N force from the broom and then has a speed of 1.0 m/s, what is the coefficient of kinetic friction between the book and floor? Number Unitsarrow_forward
- 1. Consider the forces acting on these three changes and list in order of the magnitude of the force starting with the smallest. A --- r B -4 +q +q Find FA Find Fa Find Fe List in order of the magnitudearrow_forward1 Figure 5-19 gives the free-body diagram for four situations in which an object is pulled by several forces across a frictionless floor, as seen from overhead. In which situations does the acceleration a of the object have (a) an x component and (b) a y component? (c) In each situation, give the direction of a by naming either a quadrant or a direction along an axis. (Don't reach for the calculator because this can be answered with a few mental calculat s.) A7N 46N 46 N 3 N 3 N 2NT 3 N 2 N 3 N 5 N 2 N 5 N 2NV 4N 5 N v4 N ,3N 4 N ,4N 5 N V4 N (1) (2) (3) (4)arrow_forwardA 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_forward
- 5) A 640-N hunter gets a rope around a 3200-N polar bear. They are initially stationary, 20 meters apart, on frictionless level ice. The hunter now pulls on the rope such that she and the polar bear slide closer together. This continues until they eventually meet at some point on the ice. What total distance will the polar bear have slid? a) 1.0 m b) 3.3 m c) 10 m d) 12 m e) 17 marrow_forwardA 610 kg car pulling a 545 kg trailer accelerates forward at a rate of 2.25 m/s2. Assume frictional forces on the trailer are negligible. Ignore air drag. (a) Calculate the net force (in N) on the car. magnitude N direction -Select--- (b) Calculate the net force (in N) on the trailer. magnitude N direction ---Select--- (c) What is the force (in N) exerted by the trailer on the car? magnitude N direction ---Select--- (d) What is the resultant force exerted by the car on the road? (Assume that the forward direction is along the +x-direction to the right and that the +y-direction points upward. Enter the magnitude in N and the direction in degrees measured from the left of the -y-direction.) magnitude N direction ° (measured from the left of the -y-direction)arrow_forwardPROBLEM 2 • An elevator and its load have a total mass of 800kg.Find the tension in the supporting cable when the elevator or lift originally moving downwards at 10m/s is brought to rest with a constant acceleration in a distance 25m Answer T-9600N.Since T> W the system is retarding.arrow_forward
- 8) Two blocks of masses ml and m2 are oriented as shown in the diagram. The block ml moves on a surface with coefficient of kinetic friction μ1, and the coefficient of static friction between the two blocks is μ2. What is the minimum force F which must be applied to ml such that m2 remains stationary relative to m1? = M2 F FF m2 ml M² (Block 21 Fir² = m₂a Fix/ma 9= F= 12+ mgm, ma Block 1: F-F-F=m, a F-m,gu₁₂ = F12/m2 12 m.g Fimm, gu,arrow_forward2) Veronica is working in a shoe test lab measuring the coefficient of friction for tennis shoes on a variety of surfaces. The shoes are pushed against the surface with a force of 400 N, and a sample of the surface material is then pulled out from under the shoe by a machine. The machine pulls with a force of 300 N before the material begins to slide. When the material is sliding, the machine has to pull with a force of only 200 N to keep the material moving. a. What is the coefficient of static friction between the shoe and the material? b. What is the coefficient of dynamic friction between the shoe and the material?arrow_forward9) A block is pushed across a horizontal surface by the force shown in the image. If the coefficient of kinetic friction between the block and the surface is 0.30, F = 20 N, and M = 3.0 kg, what is the magnitude of the block's acceleration? Answers: a) 2.8 m/s b) 2.3 m/s c) 1.8 m/s d) 3.3 m/s e) 5.4 m/sarrow_forward
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