(a) A 11.0 g wad of sticky clay is hurled horizontally at a 120 g wooden block initially at rest on a horizontal surface. The clay sticks to the block. After impact, the block slides 7.50 m before coming to rest. If the coefficient of friction between block and surface is 0.650, what was the speed of the cay (in m/s) immediately before impact? m/s (b) What If? Could static friction prevent the block from moving after being struck by the wad of clay if the collision took place in a time interval At - 0.100 s? Explain your answer. O Yes, a slightly larger coefficient of static friction could reasonably prevent the block from moving. O No, the coefficient of static friction that would be required is unrealistically large.
(a) A 11.0 g wad of sticky clay is hurled horizontally at a 120 g wooden block initially at rest on a horizontal surface. The clay sticks to the block. After impact, the block slides 7.50 m before coming to rest. If the coefficient of friction between block and surface is 0.650, what was the speed of the cay (in m/s) immediately before impact? m/s (b) What If? Could static friction prevent the block from moving after being struck by the wad of clay if the collision took place in a time interval At - 0.100 s? Explain your answer. O Yes, a slightly larger coefficient of static friction could reasonably prevent the block from moving. O No, the coefficient of static friction that would be required is unrealistically large.
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Transcribed Image Text:(a) A 11.0 g wad of sticky clay is hurled horizontally at a 120 g wooden block initially at rest on a horizontal surface. The clay sticks to the block. After impact, the block slides 7.50 m before coming to rest. If the coefficient of
friction between block and surface is 0.650, what was the speed of the day (in m/s) immediately before impact?
m/s
(b) What If? Could static friction prevent the block from moving after being struck by the wad of clay if the collision took place in a time interval At = 0.100 s? Explain your answer.
O Yes, a slightly larger coefficient of static friction could reasonably prevent the block from moving.
O No, the coefficient of static friction that would be required is unrealistically large.
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A 1.15-kg wooden block rests on a table over a large hole as in the figure below. A 5.30-g bullet with an initial velocity v, is fired upward into the bottom of the block and remains in the block after the collision. The block and
bullet rise to a maximum height of 21.0 cm.
(a) Describe how you would find the initial velocity of the bullet using ideas you have learned in this chapter.
O Using the conservation of momentum, you can relate the speed of the block and bullet right after the collision to the initial speed of the bullet. Then, you can use the conservation of mechanical energy for the
bullet-block-Earth system to relate the speed after the collision to the maximum height.
O Using the conservation of chemical energy you can relate the increased temperature of the block after the collision to the initial speed of the bullet. Then, you can use the conservation of mechanical energy for the
bullet-block-Earth system to relate the speed after the collision to the maximum height.
O You can find the center
mass of the system based on how far the bullet stops inside the wooden block. Using the the work-energy theorem you can relate this the change in potential energy of the center of
mass to the maximum height, U.- Mgyy: Then, you can use the conservation of energy to relate this potential energy to the initial kinetic energy of the bullet.
(b) Calculate the initial velocity of the bullet from the information provided. (Let up be the positive direction.)
m/s
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