COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 5, Problem 88QAP
To determine
An expression for angle
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70
0• One end of a uniform
meter stick is placed against a
vertical wall (Fig. P70). The
other end is held by a light-
weight cord that makes an
angle 0 with the stick. The
Figure P70
coefficient of static friction
between the end of the meter
- x -
stick and the wall is 0.40.
(a) What is the maximum value
the angle 0 can have if the stick
is to remain in equilibrium? (b) Let the angle 0 be 15°. A block of
the same weight as the meter stick is suspended from the stick, as
shown, at a distance x from the wall. What is the minimum value of
x for which the stick will remain in equilibrium? (c) When
15°, how large must the coefficient of static friction be so that
the block can be attached 10 cm from the left end of the stick with-
out causing it to slip?
2-18. Determine the resultant of the parallel, coplanar force system shown in
Fig. P 2-18 and locate it with respect to point A.
100
300
200
6'
4'
FIG. P 2-18
II
Current Attempt in Progress
A child places a picnic basket on the outer rim of a merry-go-round that has a radius of 5.0 m and revolves once every 27 s. (a) What is
the speed of a point on that rim? (b) What is the lowest value of the coefficient of static friction between basket and merry-go-round
that allows the basket to stay on the ride?
(a) Number i
(b) Number i
Units
Units
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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- 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_forward4. The force F has a magnitude of 500 lb and acts along the line AM, where M is the midpoint of the vertical side OB of the parallelepiped. Express F as its magnitude times the appropriate unit vector and determine its x-, y-, and z-scalar components. B M 0 10" F-500 lb 16" 16" Aarrow_forward8-105. A 10-kg cylinder D, which is attached to a small pulley B, is placed on the cord as shown. Determine the largest angles so that the cord does not slip over the peg at C. The cylinder at E also has a mass of 10 kg, and the coefficient of static friction between the cord and the peg is μ = 0.1. PROB. 8-105 A 0 B D 0 Earrow_forward
- Question P •C W The man in the diagram is trying to move a large box by pushing on it with a force, P. The box weighs W = 250 N and its centre of gravity is located in the centre of the box (point C). Given: The coefficient of static friction between the box and the floor is μs = 0.3 Dimensions: a = 1.8m, b=0.6m, h= 0.9 m We want to know whether the box will move if P = 70 N. Scenario: Box remains stationary First, let us consider the case of the box remaining stationary. Calculate the Friction force and Normal force under this condition. Then consider, how far from the centre line of the box does the normal force act. a. First, calculate the magnitude of the friction force (between box and floor) generated under Scenario. b. Calculate the magnitude of the normal force acting under the box. c. Calculate the location of the normal force - find its horizontal distance from box centre line.arrow_forwardIn Problem 10, the mass of the sign is 25.4 kg, and the mass of the potted plant is 66.7 kg. a. Assuming the objects are in equilibrium, determine the magnitude of the static friction force experienced by the potted plant. b. What is the maximum value of the static friction force if the coefficient of static friction between the pot and the roof is 0.572?arrow_forwardLisa measured the coefficient of static friction between two pairs of running shoes and the track in Example 6.1 (page 159). If she wants to have an advantage in a race, which shoes should she wear, the ones with a high coefficient or the ones with the low coefficient of static friction? Explain.arrow_forward
- Why is the following situation impossible? A softball pitcher has a strange technique: she begins with her hand at rest at the highest point she can reach and then quickly rotates her arm backward so that the ball moves through a half-circle path. She releases the ball when her hand reaches the bottom of the path. The pitcher maintains a component of force on the 0.180-kg ball of constant magnitude 12.0 N in the direction of motion around the complete path. As the ball arrives at the bottom of the path, it leaves her hand with a speed of 25.0 m/s.arrow_forwardThe maximum lift force on a bat is proportional to the square of its flying speed v. For the hoary bat (Lasiurus cinereus), the magnitude of the lift force is given by Fl (0.018 N s2/m2) v2 The bat can fly in a horizontal circle by banking its wings at an angle , as shown in Figure P7.72. In this situation, the magnitude of the vertical component of the lift force must equal the bats weight. The horizontal component of the Figure P7.72. force provides the centripetal acceleration. (a) What is the minimum speed that the bat can have if its mass is 0.031 kg? (b) If the maximum speed of the bat is 10 m/s, what is the maximum banking angle that allows the bat to stay in a horizontal plane? (c) What is the radius of the circle of its flight when the bat flies at its maximum speed? (d) Can the bat turn with a smaller radius by flying more slowly?arrow_forwardThe maximum lift force on a bat is proportional to the square of its flying speed v. For the hoary bat (Lasiurus cinereus), the magnitude of the lift force is given by Fl (0.018 N s2/m2) v2 The bat can fly in a horizontal circle by banking its wings at an angle , as shown in Figure P7.72. In this situation, the magnitude of the vertical component of the lift force must equal the bats weight. The horizontal component of the Figure P7.72. force provides the centripetal acceleration. (a) What is the minimum speed that the bat can have if its mass is 0.031 kg? (b) If the maximum speed of the bat is 10 m/s, what is the maximum banking angle that allows the bat to stay in a horizontal plane? (c) What is the radius of the circle of its flight when the bat flies at its maximum speed? (d) Can the bat turn with a smaller radius by flying more slowly?arrow_forward
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