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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13-55
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
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?
Chapter 5 Solutions
COLLEGE PHYSICS
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- 13 3barrow_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_forward3.- A truck tows a 400 kg log from a ditch by means of a winch attached to its rear part. Knowing that the winch applies a constant force F and the coefficient of kinetic friction between the ground and the log is 0.5, determine the force F if the log reaches a speed of 0.5 m / s in 1.8 s. Visual representation (Make drawings or diagrams, clearly indicate the vectors and variables involved in the problem, it can be on the drawing)arrow_forward
- 1. A parallel force system acts on the lever shown in Fig. P-236. Determine the magnitude and position of the resultant. 30 lb 60 lb 20 lb 40 lb 2' 3' 2' 4' Figure P-236arrow_forward8-63. 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 mmarrow_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_forward
- EXAMPLE 5-11 ESTIMATE Gravity on Everest. Estimate the effective value of g on the top of Mt. Everest, 8850 m (29,035 ft) above sea level (Fig. 5-20). That is, what is the acceleration due to gravity of objects allowed to fall freely at this altitude? Ignore the mass of the mountain itself. APPROACH The force of gravity (and the acceleration due to gravity g) depends on the distance from the center of the Earth, so there will be an effective value g on top of Mt. Everest which will be smaller than g at sea level. We assume the Earth is a uniform sphere (a reasonable "estimate"). SOLUTION We use Eq. 5-5, with r replaced by r = 6380 km + 8.9 km 6389 km 6.389 x 106 m: (6.67 x 10-11 N-m2/kg²)(5.98 x 1024 kg) (6.389 x 10° m) which is a reduction of about 3 parts in a thousand (0.3%). ME 8 = G- = 9.77 m/s, %3D %3D How many Significant Figures are in the answer? Checkarrow_forwardI don't understans the question belowarrow_forwardQuestion 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_forward
- 5. An old rope can now only safely suspend 120 kg. When the rope is tied to a beam, it hangs down with a vertical length of 12.0 m. Calculate the minimum time required for an 85 kg person starting from rest to climb the entire length of the rope without breaking it. ™arrow_forward10arrow_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
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