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A 3.0 kg body is at rest on a frictionless horizontal air track when a constant horizontal force
Figure 7-25 Problem 7.
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- A 1.00-kg object slides to the right on a surface having a coefficient of kinetic friction 0.250 (Fig. P7.68a). The object has a speed of vi = 3.00 m/s when it makes contact with a light spring (Fig. P7.68b) that has a force constant of 50.0 N/m. The object comes to rest after the spring has been compressed a distance d (Fig. P7.68c). The object is then forced toward the left by the spring (Fig. P7.68d) and continues to move in that direction beyond the springs unstretched position. Finally, the object comes to rest a distance D to the left of the unstretched spring (Fig. P7.68e). Find (a) the distance of compression d, (b) the speed v at the unstretched position when the object is moving to the left (Fig. P7.68d), and (c) the distance D where the object comes to rest. Figure P7.68arrow_forwardA 1.75 kg wood block is on a horizontal wood surface and a light string attached to the block passes over a frictionless pulley to a 775 g load that hangs freely (Fig. 8-10). If the 1.75 kg block is initially sliding toward the pulley, find (a) the acceleration of the block, and (b) the tension in the stringarrow_forwardA 40 kg box has an initial velocity of 6 m/s down a 30-degree inclined plane at an initial height of 4 meters. The coefficient of friction between the box and the ground is 0.4. Calculate the box's velocity when it reaches the bottom of the inclined plane.arrow_forward
- A warehouse worker is pushing a 90.0 kg crate with a horizontal force of 276N at a speed of v = 0.875m/s across the warehouse floor. He encounters a rough horizontal section of the floor that is 0.75 m long and where the coefficient of kinetic friction between the crate and floor is 0.353. (a) Determine the magnitude and direction of the net force acting on the crate while it is pushed over the rough section of the floor. magnitude Ndirection ---Select--- up down in the same direction as the motion of the crate in the opposite direction as the motion of the crate (b) Determine the net work done on the crate while it is pushed over the rough section of the floor. J (c) Find the speed of the crate when it reaches the end of the rough surface. m/sarrow_forwardThe 60-kg crate is projected along the floor with an initial speed of vo = 6.8 m/s at x = 0. The coefficient of kinetic friction is Uk = 0.55. Calculate the time t required for the crate to come to rest and the corresponding distance x traveled. Answers: t= Mk X= 1.26 i 5.17 VO x S marrow_forward(a) A Block of mass 0.2kg is given an initial speed vo =5km/s on a horizontal rough surface of length 2m as in figure. The coefficient of kinetic friction on the horizontal surface is 0.30. if the curved part of the track is frictionless how high does the block rise before coming to rest. A 2marrow_forward
- Answer A and B for question 2 2. An object was a mass of 10.0 kg is at rest at the top of a frictionless inclined plane of length 8.00 m and an angle of inclination 30.0° with the horizontal. The object is released from this position and it stops at a distance d from the bottom of the inclined plane along a horizontal surface, as shown in Fig. 8-6. The coefficient of kinetic friction for the horizontal surface of 0.400. (a) What is the speed of the object at the bottom of the inclined plane? (b) At what horizontal distance from the bottom of the inclined plane will this object stop?arrow_forwardA skater starts from rest at the top of a frictionless hill that is inclined at 12⁰ with the horizontal. The hillside is 80.0 m long and the coefficient of friction between the snow and the skis is 0.125. At the bottom of the hill, the snow is level and the coefficient of friction is unchanged. Calculate the distance the skater slides along the horizontal portion of the snow before coming to rest.arrow_forwarda block of mass m is initially at rest at the highest point of an inclined plane, which has a height of 6.8 m and has an angle of 0=16 degrees with respect to the horizontal. After it has been released, you perceived it to be moving at v=0.55 m/s a distance d after the end of the inclined plane as shown. The coefficient of kinetic friction between the block and the plane i sup=0.1 and the coefficient of friction on the horizontal surface its ur=0.2. a)what is the speed of the block, in meters per second, just after it leaves the inclined plane? b)Find the distance, d, in meters.arrow_forward
- A crate of mass m is initially at rest at the highest point of an inclined plane which has a height of 5.28 m and makes an angle of A = 17.2° with respect to the horizontal. After it has been released, it is found to be traveling at v = 0.29 m/s a distance dafter the end of the inclined plane, as shown. The coefficient of kinetic friction between the crate and the plane is tp = 0.1, and the coefficient of friction on the horizontal surface is f4r = 0.2.arrow_forwardA warehouse worker is pushing a 90.0 kg crate with a horizontal force of 300 N at a speed of v = 0.850 m/s across the warehouse floor. He encounters a rough horizontal section of the floor that is 0.75 m long and where the coefficient of kinetic friction between the crate and floor is 0.360. m (a) Determine the magnitude and direction of the net force acting on the crate while it is pushed over the rough section of the floor. magnitude Have you drawn a force diagram and identified all forces acting on the crate? N direction --Select-- X Have you drawn a force diagram and identified all forces acting on the crate? (b) Determine the net work done on the crate while it is pushed over the rough section of the floor. Can you write an expression for the net work done on the crate in terms of the net force acting on the crate? J (c) Find the speed of the crate when it reaches the end of the rough surface. Can you develop an expression for the final speed of the crate in terms of its initial…arrow_forwardA 3 kg block travels along a horizontal surface with a coefficient of kinetic friction of 0.28 at a speed of 7 m/s. After sliding a distance of 1.4 m the block makes a smooth transition to a ramp with a coefficient of kinetic friction of 0.28. How far up the ramp does the block travelled before coming to a momentary stop.arrow_forward
- Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningClassical Dynamics of Particles and SystemsPhysicsISBN:9780534408961Author:Stephen T. Thornton, Jerry B. MarionPublisher:Cengage Learning
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