Schaum's Outline of College Physics, Twelfth Edition (Schaum's Outlines)
12th Edition
ISBN: 9781259587399
Author: Eugene Hecht
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 4, Problem 33SP
The block in Fig. 4-16 is just on the verge of slipping. If
Fig. 4-16
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The coefficient of static friction µg between the 83-lb body and the 14° wedge is 0.37. Determine the magnitude of the force P required
to begin raising the 83-lb body if (a) rollers of negligible friction are present under the wedge, as illustrated, and (b) the rollers are
removed and the coefficient of static friction Hs = 0.37 applies at this surface as well.
83 lb
14°
Answers:
(a) P = i
Ib
(b) P =
i
Ib
18E. (a) An 11.0 kg salami is supported by a cord that runs to a
spring scale, which is supported by another cord from the ceiling
(Fig. 5-43a). What is the reading on the scale? (b) In Fig. 5-43b
the salami is supported by a cord that runs around a pulley and to
a scale. The opposite end of the scale is attached by a cord to a
wall. What is the reading on the scale? (c) In Fig. 5-43c the wall
has been replaced with a second 1.0 kg salami on the left, and
the assembly is stationary, What is the reading on the scale now?
Spring scale
Spring
scale
11 kg
(b)
Spring scale
I1 kg
(a)
11 kg
11 kg
(6)
The coefficient of static friction between a block of mass
m and an incline is = 0•3. (a) What can be the
maximum angle e of the incline with the horizontal so
that the block does not slip on the plane ? (b) If the incline
makes an angle 8/2 with the horizontal, find the
frictional force on the block.
Chapter 4 Solutions
Schaum's Outline of College Physics, Twelfth Edition (Schaum's Outlines)
Ch. 4 - 4.9 [I] A person stands on a scale, which then...Ch. 4 - 4.10 [I] Two evenly matched teams of youngsters...Ch. 4 - 4.11 [I] A rope is tied to a hook fastened to a...Ch. 4 - 4.12 [I] An essentially weightless pulley that is...Ch. 4 - 4.13 [I] An essentially weightless rope is slung...Ch. 4 - 4.14 [I] An essentially weightless rope is slung...Ch. 4 - 4.15 [I] A 2.00-kg block rests on a frictionless...Ch. 4 - 4.16 [I] The load in Fig. 4-7 is hanging at rest....Ch. 4 - 4.17 [I] (a) A 600-N load hangs motionlessly in...Ch. 4 - 4.18 [I] For the situation shown in Fig. 4-9, find...
Ch. 4 - 19. The following coplanar forces pull on a ring:...Ch. 4 - 4.20 [II] In Fig. 4-10, the pulleys are...Ch. 4 - 4.21 [II] Suppose in Fig. 4-10 is 500 N. Find the...Ch. 4 - 4.22 [I] If in Fig. 4-11 the friction between the...Ch. 4 - 4.23 [II] The system in Fig. 4-11 remains at rest...Ch. 4 - 24. Find the normal force acting on the block in...Ch. 4 - 25. The block depicted Fig. 4-12(a) slides with...Ch. 4 - 26. The block shown in Fig. 4-12(b) slides at a...Ch. 4 - 27. The block in Fig. 4-12(c) just begins to slide...Ch. 4 - 4.28 [II] If in the equilibrium situation shown...Ch. 4 -
29. Refer to the equilibrium situation shown in...Ch. 4 - 4.30 [III] The hanging object in Fig. 4-14 is in...Ch. 4 - 31. The pulleys shown in Fig. 4-15 have negligible...Ch. 4 - 4.32 [III] In Fig. 4-16, the system is at rest....Ch. 4 - 4.33 [III] The block in Fig. 4-16 is just on the...
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- Calculate P required to move block A upward. Assume the coefficient of friction is 0.2 below block B. Neglect friction at all other contact surfaces. 30° P B 80 lb H₂ = 0.2 A 120 lbarrow_forwardD A E 30° C ab B 40 kg If mass of cylinder A is 20kg, determine tension in cable DE if angle is oº, 20°, and 45°.arrow_forwardLogs weighing 1.3 kg and 2.2 kg lie on a flat surface and are connected by a rope that breaks at a force of 20 N. The coefficient of friction between the lighter log and the base is 0.50, and between the heavier log and the base 0.30. With what maximum force can we pull the lighter log so that the string does not break?arrow_forward
- An object of mass 30.0 kg rests on a rough horizontal plane and the coefficient of friction between the surfaces is 0.150. Calculate the least horizontal force required just to move the object.arrow_forwardA block of weight 50N is on a inclined surface with angle 0f 15⁰ with the horizontal. If the coefficient of static friction is 0.15, what is its maximum static frictional force that prevents it from sliding?arrow_forwardAn initially stationary box of sand is to be pulled across a floor by means of a cable in which the tension should not exceed 861 N. The coefficient of static friction between the box and the floor is 0.450. (a) What should be the angle between the cable and the horizontal in order to pull the greatest possible amount of sand, and (b) what is the weight of the sand and box in that situation? (a) Number Units (b) Number i Unitsarrow_forward
- The coefficient of kinetic friction between a box and the floor is u, = 0.16 and the coefficient of static friction is u, = 2.0µ. (a) Calculate the ratio of static to kinetic friction force if m = 9 kg. (b) Will the ratio change if the value of m is changed but u, still equals 2.0µ? Yes Noarrow_forwardThe angle of inclination of the wedge and block is 25°. The angle of friction all contact surface is 17°. Determine the P required to pull the wedge from under the 500 N block if the block is against the wall. Assume rough contact surfaces.arrow_forwardA 1.6 kg book is pressed against a wall with a perpendicular force. The coefficient of friction is 0.25. What minimum force must be applied to the book so that is doesn’t slide down the wall.arrow_forward
- The coefficient of kinetic friction between a box and the floor is μk = 0.14 and the coefficient of static friction is μs = 2.0μk. Calculate the ratio of static to kinetic friction force if m = 8 kg.arrow_forwardA 400 kg block is resting on an inclined plane making an angle of 20° from the horizontal. If the coefficient of friction is 0.60, determine the force parallel to the incline that must be applied to cause impending motion down the plane.arrow_forwardProblem 2: Determine the force P necessary to start the V-shaped wedge to the right if the coefficient of friction is f= 0.445 at each of the three surfaces of contact. Wg =1000N WA =200N в P- 30° 150arrow_forward
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