Physics Fundamentals
2nd Edition
ISBN: 9780971313453
Author: Vincent P. Coletta
Publisher: PHYSICS CURRICULUM+INSTRUCT.INC.
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Chapter 4, Problem 44P
To determine
To Find:The tension in the rope.
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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.
2-71. Specify the magnitude and coordinate direction
angles aj, B1. Yı of F, so that the resultant of the three
forces acting on the bracket is FR = {-350k } Ib. Note that
F; lies in the x-y plane.
F = 400 lb
30
F = 200 Ib
Prob. 2-71
Three 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.
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
Ch. 4 - Prob. 11QCh. 4 - Prob. 12QCh. 4 - Prob. 13QCh. 4 - Prob. 14QCh. 4 - Prob. 15QCh. 4 - Prob. 16QCh. 4 - Prob. 1PCh. 4 - Prob. 2PCh. 4 - Prob. 3PCh. 4 - Prob. 4PCh. 4 - Prob. 5PCh. 4 - Prob. 6PCh. 4 - Prob. 7PCh. 4 - Prob. 8PCh. 4 - Prob. 9PCh. 4 - Prob. 10PCh. 4 - Prob. 11PCh. 4 - Prob. 12PCh. 4 - Prob. 13PCh. 4 - Prob. 14PCh. 4 - Prob. 15PCh. 4 - Prob. 16PCh. 4 - Prob. 17PCh. 4 - Prob. 18PCh. 4 - Prob. 19PCh. 4 - Prob. 20PCh. 4 - Prob. 21PCh. 4 - Prob. 22PCh. 4 - Prob. 23PCh. 4 - Prob. 24PCh. 4 - Prob. 25PCh. 4 - Prob. 26PCh. 4 - Prob. 27PCh. 4 - Prob. 28PCh. 4 - Prob. 29PCh. 4 - Prob. 30PCh. 4 - Prob. 31PCh. 4 - Prob. 32PCh. 4 - Prob. 33PCh. 4 - Prob. 34PCh. 4 - Prob. 35PCh. 4 - Prob. 36PCh. 4 - Prob. 37PCh. 4 - Prob. 38PCh. 4 - Prob. 39PCh. 4 - Prob. 40PCh. 4 - Prob. 41PCh. 4 - Prob. 42PCh. 4 - Prob. 43PCh. 4 - Prob. 44PCh. 4 - Prob. 45PCh. 4 - Prob. 46PCh. 4 - Prob. 47PCh. 4 - Prob. 48PCh. 4 - Prob. 49PCh. 4 - Prob. 50PCh. 4 - Prob. 51PCh. 4 - Prob. 52PCh. 4 - Prob. 53PCh. 4 - Prob. 54PCh. 4 - Prob. 55PCh. 4 - Prob. 56P
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- NEWTON'S LAWS WITH FRICTION PH 421 5 0 A 2.5 kg block is initially at rest on a horizontal surface. A horizontal force F of magnitude 6.0 N and a vertical force P are then applied to the block (Fig. 6-17). The coefficients of friction for the block and surface are M, magnitude of the frictional force acting on the block if the magni- tude of P is (a) 8.0 N, (b) 10 N, and (c) 12 N. = 0.40 and H = 0.25. Determine the %3D N. F. Flg. 6-17 Problem 5.arrow_forward3-39. A "scale" is constructed with a 4-ft-long cord and the 10-lb block D. The cord is fixed to a pin at A and passes over two small pulleys. Determine the weight of the suspended block B if the system is in equilibrium when s=1.5 ftarrow_forward5-65. If P = 6 kN, x 0.75 m and y = 1 m, determine the tension developed in cables AB, CD, and EF. Neglect the weight of the plate. F P E 2marrow_forward
- 2-91. Two forces act on the hook. Determine the magnitude of the projection of F, along F1. F= 600 N 45 60 120 F2 = [120i + 90j - 0k]Narrow_forward2-49. If F1 300 N and 0 = 10°, determine the magnitude and direction, measured counterclockwise from the positive x' axis, of the resultant force acting on the bracket. y F2= 200 N F3 = 180 N 60° F1 13 12arrow_forwardA 2.20 kg block is initially at rest on a horizontal surface. A horizontal force of magnitude 4.83 N and a vertical force are then applied to the block (Fig. 6-17). The coefficients of friction for the block and surface are µs = 0.4 and µk = 0.25. Determine the magnitude of the frictional force acting on the block if the magnitude of is (a) 8.00 N and (b) 12.0 N. (The upward pull is insufficient to move the block vertically.)arrow_forward
- 1) Two blocks of masses m, = 5kg and m, 2kg are connected by a rope. The coefficient of %3! static friction between m, and the surface is u, = 0.5, and the coefficient of kinetic friction %3D is = 0.4. Which of the the following statements is correct about the type and the magnitude of the friction force acting on m, ? (Let g =10m/s) %3D mi Select one: a. Static, 20 Newtons b. Kinetic, 20 Newtons c. Static, 50 Newtons d. Static, 25 Newtons e. Kinetic, 50 Newtons f. Static, 0 g. Kinetic, 0 h. Kinetic, 25 Newtonsarrow_forwardA 25 N crate is held at rest on an inclined plane, without friction, by a force parallel to the inclined plane. If the inclined plane makes an angle of 25º with the horizontal, the magnitude of the force is: a) 23 N b) 4,6 N c) 4,1 N d) 11 N e) 8,9 Narrow_forward2) As shown below, a passenger pulls on the suitcase that has a mass M, with a force of 30.0 N and displaces the suitcase horizontally 10.0 m. The angle between F and the horizontal is 30°. The coefficient of kinetic friction HK = 0.45 Force and displacement are not in the same direction; here W = FAx. Ar (b) The force that the passenger applies to the suitcase is not in the same direction as the displacement of the suitcase, so we have to find the "piece" or "component" of the force vector F that is in the same direction as the displacement. In other words, we must find F, = Fcos0, where 0 is the angle between the two vectors, F and Fx a. If 0 = 30°, what work is done on the suitcase by the passenger? b. What is the work done on the suitcase by friction? (remember that we can always express the force due to kinetic friction as follows: f = HgN; so now that we have the force we can find the work done by multiplying this force by the displacement. Be careful --- the normal force is NOT…arrow_forward
- 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.arrow_forwardA stone hangs by a fine thread from the ceiling, and a section of the same thread dangles from the bottom of the stone (Fig. 4–36). If a person gives a sharp pull on the dangling thread, where is the thread likely to break: below the stone or above it? What if the person gives a slow and steady pull? Explain your answers. FIGURE 4-36 Question 9.arrow_forward. A 50 kg box lies on top of a 30° inclined plane, what is the force exerted by the plane on the box? (Complete solution)arrow_forward
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