Physics Fundamentals
2nd Edition
ISBN: 9780971313453
Author: Vincent P. Coletta
Publisher: PHYSICS CURRICULUM+INSTRUCT.INC.
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Chapter 4, Problem 33P
To determine
To Find:The weights
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4-61. The drum has a weight of 500 N and rests on the
floor for which the coefficient of static friction is 4, = 0.5.
If a = 0.9 m and b= 1.2 m, determine the smallest
magnitude of the force P that will cause impending motion
of the drum.
Block B in Fig. 6-31 weighs 711 N.The coefficient of static friction between block and table is 0.25; angle u is 30; assume that the cord between B and the knot is horizontal. Find the maximum weight of block A for which the system will be stationary.
The 70.0-kg climber in Fig. 4-72 is supported in the
“chimney" by the friction forces exerted on his shoes and
back. The static coefficients of friction between his shoes
and the wall, and between his
back and the wall, are 0.80 and
0.60, respectively. What is the
minimum normal force he must
exert? Assume the walls are ver-
tical and that the static friction
forces are both at their maximum.
Ignore his grip on the rope.
FIGURE 4–72
Problem 89.
Chapter 4 Solutions
Physics Fundamentals
Ch. 4 - Prob. 1QCh. 4 - Prob. 2QCh. 4 - Prob. 3QCh. 4 - Prob. 4QCh. 4 - Prob. 5QCh. 4 - Prob. 6QCh. 4 - Prob. 7QCh. 4 - Prob. 8QCh. 4 - Prob. 9QCh. 4 - Prob. 10Q
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- 1 kg is found A block of mass m = on an inclined plane that makes an angle 30° with the horizontal. The coefficient of static friction and coef- ficient of kinetic friction between the block and the incline are: µs and uk = 0.5. Take the positive di- rection to be up the inclined plane 0.6 %3D 130° With the block initially at rest, the acceleration of the block isarrow_forwardThree mountain climbers who are roped together in a line are ascending an icefield inclined at 31.0° to the horizontal (Fig. 4-69). The last climber slips, pulling the second climber off his feet. The first climber is able to hold them both. If each climber has a mass of 75 kg, calculate the ten- sion in each of the two sections of rope between the three climbers. Ignore friction between the ice and the fallen climbers. 31.0° FIGURE 4-69 Problem 83.arrow_forwardBodyA in Fig. 6-33 weighs 102 N, and body B weighs 32 N. The coefficients of friction between A and the incline are us =0.56 and uk=0.25. Angle 0 is 40°. Let the positive direction of an x axis be up the incline. In unit-vector notation, what is the acceleration of A if A is initially (a) at rest, (b) moving up the incline, and (c) moving down the incline Frictionless, massless pulleyarrow_forward
- (a) What minimum force F is needed to lift the piano (mass M) using the pulley apparatus shown in Fig. 4–66? (b) Determine the tension in each section of rope: Fr1, Fr2, Fr3, and Fr4. Assume pulleys are massless and frictionless, and that ropes are massless. FT3 F72 FTI FT4 F FIGURE 4-66 Problem 76. सarrow_forward25 sSM www Block B in Fig. 6-31 weighs 711 N. The coefficient of static friction between block and Knot- table is 0.25; angle is 30°; assume that the cord between B and the B. knot is horizontal. Find the maxi- mum weight of block A for which the system will be stationary.arrow_forward12. The box of donuts in Fig. 5-32 has a weight component of 5 N along the frictionless ramp. The force on the box from the cord has magnitude T. When the box is (a) stationary, (b) moving up the ramp at constant speed, (c) moving down the ramp at constant speed, (d) moving up the ramp at decreasing speed, and (e) moving down the ramp at decreasing speed, is T equal to, greater than, or less than 5 N? FRESH DONUTSarrow_forward
- A man pushes horizontally a box, how many forces in total are acting on the man? Caution: consider the friction.arrow_forwardA car is traveling up a hill that is inclined at an angle θ above the horizontal. Determine the ratio of the magnitude of the normal force to the weight of the car when (a) θ = 16oand (b) θ = 38o.arrow_forwardIn Fig. 6-59, block 1 of mass m1 ? 2.0 kg and block 2 of mass m2 ? 1.0 kg are connected by a string of negligible mass. Block 2 is pushed by force F of magnitude 20 N and angle u ? 35°. The coefficient of kinetic friction between each block and the horizontal surface is 0.20. What is the tension in the string? (please don't copy-paste solution)arrow_forward
- 4-54. The spool has a mass of 200 kg and rests against the wall and on the floor. If the coefficient of static friction at B is (4)e = 0.3, the coefficient of kinetic friction is (He)B = 0.2, and the wall is smooth, determine the friction force developed at B when the vertical force applied to the cable is P= 80 N. 0.4 m 0.1 marrow_forward15-7. Crates A and B weigh 100 lb and 50 lb, respectively. If they start from rest, determine their speed when t = 5 s. Also, find the force exerted by crate A on crate B during the motion. The coefficient of kinetic friction between the crates and the ground is µ = 0.25. A P = 50 lbarrow_forwardA box weighing 66.0 N rests on a table. A rope tied to the box runs vertically upward over a pulley and a weight is hung from the other end (Fig. 4-37). Determine the force that the table exerts on the box if the weight hanging on the other side of the pulley weighs (a) 30.0 N, (b) 60.0 N, and (c) 90.0 N.arrow_forward
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