2. A box weighing 200 N is placed on the floor of a truck moving at 72 kph horizontally. Coefficient of friction between the box and the floor is 0.5. a) Determine the acceleration of the box. b) Determine the time that the truck will move before the box stops slipping. c) Determine the distance that the truck will move before the box stops slipping. Xo 20 m/s

2. A box weighing 200 N is placed on the floor of a truck moving at 72 kph horizontally. Coefficient of friction between the box and the floor is 0.5. a) Determine the acceleration of the box. b) Determine the time that the truck will move before the box stops slipping. c) Determine the distance that the truck will move before the box stops slipping. Xo 20 m/s

Physics for Scientists and Engineers with Modern Physics

10th Edition

ISBN:9781337553292

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter6: Circular Motion And Other Applications Of Newton's Laws

Section: Chapter Questions

Problem 45CP: A 9.00-kg object starting from rest falls through a viscous medium and experiences a resistive force...

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A box weighing 200 N is placed on the floor of a truck moving at 72 kph horizontally. Coefficient of friction between the box and the floor is 0.5. a) Determine the acceleration of the box. b) Determine the time that the truck will move before the box stops slipping. c) Determine the distance that the truck will move before the box stops slipping.
1. Steve pushes a box across a level floor with a constant horizontal force. This causes the box to move at a constant speed, v. The force from Steve: a. has the same magnitude as the weight of the box. b. equals the sum of the box's weight and the total frictional forces opposing the box's motion. c. has the same magnitude as the frictional forces opposing the box's motion. d. has greater magnitude than the frictional forces opposing the box's motion. e. has greater magnitude than the weight of the box. 2. Steve now doubles the force he applies to th box from the previous problem. Which of the following is true? a. The box will move at double the previous speed. b. The box will move with a continuously increasing speed. c. The box will increase speed for a while, then move at a constant speed. d. The box will continue to move at the same speed for a while, then continually increase speed. e. The box will move at a greater constant speed, but not necessarily double the speed.
8. A block is at rest on a rough inclined plane and is connected to an object with the same mass as shown. The rope may be considered massless; and the pulley may be considered frictionless. The coeffi- cient of static friction between the block and the plane is us; and the coefficient of kinetic friction is k 0 A. g D. g - Hk sin(0) m a. What is the magnitude of the static frictional force acting on the block? B.m g [1 - sin(0)] C. mg D. mg cos(0) B. g - Hk cos(0) A. m g sin(0) E. mg [1 - cos(0)] b. If the rope were cut between the block and the pulley, what would be the magnitude of the acceleration of the block down the plane? C. g [sin(0) - μ cos(0)] sin(0)] c. If the mass of the suspended object is doubled, what will be the acceleration of the block up the plane? B. g [2 tan(0) - uk sin(0)] D. 2g [μ sin(0) - cos(0)] m E. g [tan (0) A. g [2 - μk sin(0)] C. g [2 cos(0) - μ sin(0)] E. g [2 sin(0) Hk Cos (0)]. -
A box is pulled at a constant speed, v, along a horizontal surface with a kinetic coefficient of friction less than 1. The person pulls with a constant horizontal force, F, on the box. The constant horizontal force the person pulls with: A. Has the same size as the weight of the box. B. Is greater than the weight of the box. C. Is less than the weight of the box. D. Is greater than the friction force.
8. An object is pulled across a rough horizontal surface with an applied force of 300 N [40o below the horizontal]. The applied force is slowly rotated down toward the horizontal, decreasing the 40o angle. What will happen to the force of friction acting on the object and the acceleration? a. Both increase.b. Both decrease.c. Friction decreases and acceleration increases.d. Friction increases and acceleration decreases.e. None of the above statements are accurate.
6. A box is on a ramp inclined at 25° to the horizontal. The coefficient of static friction is .30, and of kinetic friction .20. 1²=30 pe Me=20m a. The box slides down the ramp. b. The box stays on the ramp without slipping. c. The box first slips, but then stays fixed after slowing down. d. We need the mass of the box to answer the question. 3250 www th mg OL M = mg COSTS
If a horizontal force is applied to an object, how can you tell if an object will start moving? A.The object will start moving if any force is applied. B.The object will start moving if the applied force is greater than the maximum static friction. C.The object will start moving if the applied force is greater than the minimum static friction. D.The object will start moving if the applied force is greater than the maximum kinetic friction. E.The object will start moving if the applied force is greater than the minimum kinetic friction
1. A man wanted to move a block the size 3m x 3m weighing 80kg. If the coefficient of friction between the block and the ground is 0.27. Which of the following methods should be used? a. Slide along the ground by pushing c. Lift it bodily b. Pull it d. Tip it over 2. The essential condition of equilibrium of a body is a. The algebraic sum of horizontal components of all forces must be zero b. The algebraic sum of vertical components of all forces must be zero c. The algebraic sum of forces about a point must be zero d. All of these 3. In which case would more power be needed? a. In lifting up a weight of 100kg at a constant speed of 3m/s b. In lifting up a weight of 100kg at a velocity 3m/s but accelerating upward 0.5m/s c. In lowering the weight at a constant speed of 3m/s d. In lowering the weight at a velocity of 3m/s and accelaration of 1m/s 4. Kinetic Friction is a. maximum value of frictional force when a body is about to move b. friction between two well lubricated bodies c.…
1.A roofer is dreagging a 15.0kg bundle of shingles up a roof at a constant speed.The roof is sloped at an angle of 30o with respect to the horizontal. d)Calculate the force parallel to the roof with which the roofers must pull on the rope to move the shringles at a constant speed up the roof.Answer to 3 significant digits. e) Suppose an astronaut was building a similar structure on Mars.What would be the force component perpindicular to the roof of the weight of a 15.0 kg bundle of materials on the surface of Mars? The mass of Mars is 6.42x1023kg and the radius of mars is 3.30x106 m. Answer to 3 significant digits.
1. Two boxes A and B are connected by a cord running over a pulley as shown in figure. The coefficient of kinetic friction between the box A and the table is 0.35. Ignore the mass of the cord and pulley and any friction on the pulley. 15 kg A B 8 kg ii. Find acceleration of the boxes
1. Two objects are connected by a string passing over a frictionless pulley. When the objects are in motion object A experiences a force of kinetic friction with a magnitude equal to 5.0 N. The mass of object A is 2.1 kg and the mass of object B is 3.3 kg. a) Determine the magnitude of acceleration for the system. b) Determine the magnitude of the tension in the string.
I.m = 15 kg us = 0.4 Determine the maximum force of static friction. 2. m = 15 kg us = 0.3. Determine the force required to accelerate the box at 4 m/s2 3.A block with a mass of 20 kg rests on an earthbound plane elevated 35 degree off the horizontal. If the coefficient of kinetic friction for this surface is 0.54, what is the acceleration of the block?