. (II) A falling rock has kinetic energy KE just before striking the ground and coming to rest. What is the total change in entropy of rock plus environment as a result of this collision?
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- A bullet of mass 50 gm is fired into a freely suspended target of 2.5 kg. On impact, the target moves with a velocity of 2.5 m/s. Find the velocity of the bullet and the loss of kinetic energy, if the impact is perfectly inelastic. Hint. After impact, the bullet and target will move with the same velocity.(II) A falling rock has kinetic energy KE just before strikingthe ground and coming to rest. What is the total change inentropy of rock plus environment as a result of this collision?Calculate the final speed of a 110kg rugby player who is initially running at 8.00 m/s but collides head-on with a padded goalpost and experiences a backward force of 1.76×104N for 5.50×10-2.
- Does the KE of a car change more when it goes from 10 to 20 km/h or when it goes from 20 to 30 km/h?A ballistic pendulum is a device that historically was used to measure the velocity of bullets. This system consists of a block of wood suspended by cords of negligible mass. When a bullet strikes the block of wood, the bullet burrows into the wood and comes to rest by frictional processes. The block and bullet combination then swing upward to a certain height, where it is momentarily at rest before swinging back down. Given the above, answer the following: If a 30.0g bullet is fired into the 5.0kg block and the combination rise to a height of 6 cm, a) What is the maximum potential energy the block and bullet combination can achieve? b) What is the velocity of the bullet before it strikes the block of wood?A tennis ball of mass 5.0×10−2 kg and speed 17 m/sm/s strikes a wall at a 45 ∘ angle and rebounds with the same speed at 45 ∘
- A 1.72 kg block of soft wood is suspended by two strings from the ceiling. The wood is free to rotatein pendulum-like fashion when a force is exerted upon it. An 8.5 g bullet is fired into the wood. Thebullet enters the wood at 431 m/s and exits the opposite side shortly thereafter. If the wood rises to aheight of 13.8 cm after the collision, then what is the exit speed of the bullet?Consider the physics of a rear-end automobile collision in which both cars are engineered to absorb as much energy by crumpling as possible on impact in order to lessen injury to its occupants. One of the vehicles is stopped at a light, the other runs into it from the rear at 60 km/h. Assume both vehicles have a mass of 1300 kg and that there are unrestrained occupants in both with masses of 75 kg. 1. Within the frame of reference of each car, how much momentum does an occupant have after the collision? 2. If the occupant of the incident car is not protected by an air bag, with what velocity in m/s does he strike the windscreen following the collision? 3. Assuming the collision duration is 0.2 seconds, what acceleration backward does the occupant of the stationary car feel on impact? (Compare to the acceleration of gravity.A ball weighing 1 kg moves at a speed of 4 m / s and collides with a ball weighing 2 kg moving towards it at a speed of 3 m / s. What are the speeds of the balls after hitting? Impact is considered absolutely elastic, direct, central.
- A billiard ball traveling at 3.00 m/s collides perfectly elastically with an identical billiardball initially at rest on the level table. The initially moving billiard ball deflects 30.0° fromits original direction. What is the speed of the initially stationary billiard ball after thecollision?A body weighing 2 kg moves with a velocity of 3 m/s and overtakes another body weighing 3 kg moving at 1 m/s. Find the velocities of the bodies after collision if: (1) the impact is inelastic, (2) the impact is elastic. The bodies move in a straight line and the impact is central.An object of mass 7.21 kg is released from rest and drops 2.05 m to the floor .The collision is completely inelastic .How much kinetic energy is lost during the collision?