Physics for Scientists and Engineers
6th Edition
ISBN: 9781429281843
Author: Tipler
Publisher: MAC HIGHER
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Chapter 5, Problem 4P
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The force Pis applied to the 45-kg block when it is at rest. Determine the magnitude and direction of the friction force exerted by the
surface on the block if (o) P-0, (b) P-138 N, and (c) P-217 N. (d) What value of P is required to initiate motion up the incline? The
static and kinetic coefficients of friction between the block and the incline are u,-0.19 and -0.13, respectively. The friction force is
positive if up the incline, negative if down the incline.
Answers
(a) F-
(b) F
(c) F=
(d) P.
45 kg
12:
-0.19
0.13
N
N
z z
N
N
Our 10kg mystery box rests on a horizontal floor. The coefficient of static friction is 0.40and the coefficient kinetic friction is 0.30. Determine tge force of friction, acting on the box if a horizontal applied force is exerted on it of magnitude: (a) 0, (b) 10N, (c) 20N (d) 38N, and (e) 40N.
A 0.85 kg block of wood is stationary on an incline that is15◦above horizontal. A force of 3.0 N is being applied toit 75◦below horizontal, directly into the incline (the force isperpendicular to the incline). What is the minimum coefficientof static friction required to keep the block stationary?
Chapter 5 Solutions
Physics for Scientists and Engineers
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- A box with a mass of 0.5 slugs lies on an inclined plane making an angle of 30o with the horizontal. If the coefficient of kinetic friction between the box and the plane is 0.4, what is the magnitude of the force that must be applied parallel to the incline to keep the box moving down the incline at a constant speed?arrow_forward1 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_forward(b) The coefficient of kinetic friction between a 40 kg crate and the ware- house floor is 70% of the corresponding coefficient of static friction. The crate falls off a forklift that is moving at 3 m/s and then slides along the warehouse floor for a distance of 2.5 m before coming to rest. What is the coefficient of static friction between the crate and the floor?arrow_forward
- A force of 600 N is applied on a block of mass M to pull it at a constant velocity up the incline at an angle of 30degrees with the horizontal. The coefficient of kinetic friction between the surface of the incline and the block is 0.5. Calculate the mass of the block.arrow_forwardBlock 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.arrow_forwardIf the coefficient of kinetic friction, , between the block and the surface is 0.30 and the magnitude of the frictional force is 80.0 N, what is the weight of the block? ( Assume the block is on a horizontal surface)arrow_forward
- Can you help me find the minimum force please? Assume both static and kinetic frictionarrow_forwardThe coefficients of static and kinetic friction between the 100-kg block and the inclined plane are 0.30 and 0.20, respectively. Determine (a) the friction force Facting on the block when P is applied with a magnitude of 200 N to the block at rest, (b) the force P required to initiate motion up the incline from rest, and (c) the friction force F acting on the block if P = 600 N. %3D P 100 kg 20° Hs = 0.30 Hk = 0.20 15° 5.arrow_forwardA horizontal force of 200 N is used to push a 50.0-kg packing crate a distance of 6.00 m on a rough horizontal surface. If the crate moves at constant speed, the coefficient of kinetic friction between the crate and surface.arrow_forward
- A person , sunbathing on a warm day, is lying horizontally onthe deck of a boat. Her mass is 59 kg, and the coefficient of staticfriction between the deck and her is 0.70. Assume that the person ismoving horizontally, and that the static frictional force is the onlyforce acting on her in this direction . (a) What is the magnitude of the static frictional force when the boat moves with a constant velocity of +8.0 m/s? (b) The boat speeds up with an acceleration of 1.6 m/s2 and she does not slip with respect to the deck . What is the magnitude of the static frictional force that acts on her? (c) What is the magnitude of the maximum acceleration the boat can have before she begins to slip relative to the deck ? If you have answered this please skip. Please put the correct formulas and process. thanksarrow_forwardA person , sunbathing on a warm day, is lying horizontally onthe deck of a boat. Her mass is 59 kg, and the coefficient of staticfriction between the deck and her is 0.70. Assume that the person ismoving horizontally, and that the static frictional force is the onlyforce acting on her in this direction . (a) What is the magnitude of the static frictional force when the boat moves with a constant velocity of +8.0 m/s? (b) The boat speeds up with an acceleration of 1.6 m/s2 and she does not slip with respect to the deck . What is the magnitude of the static frictional force that acts on her? (c) What is the magnitude of the maximum acceleration the boat can have before she begins to slip relative to the deck ?arrow_forwardA 100-N block on a rough 30o-incline is acted upon by a force P as shown causing it to accelerate at 2 m/s2 up the plane. The coefficient of kinetic friction is 0.30. (a) Draw the FBD of the block (b) Find the magnitude of P.arrow_forward
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