- #1
iTz3D
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1. A rifle with a weight of 30 N fires a 5.0 g bullet with a speed of 300 m/s. Find the recoil speed (in m/s) of the rifle.
2. If the rifle in the previous problem was held by a man with a weight of 700 N, what is the recoil speed (in m/s) of the man (with the rifle)?
3. If the bullet in the previous problem sticks in a 1.0 kg block of wood, what is the speed (in m/s) of the block (plus bullet) after the impact?
4. A 25.0 kg child on a sled slides down a hill, reaching a speed of 5.00 m/s. At the bottom of the hill, the child's inattentive, 75.0 kg father is standing still. When the child reaches the father, the father is knocked onto the sled. What is the sled's new speed (in m/s)?
5. A 300 kg cannon sits on a frozen lake. It fires a 6.00 kg cannonball horizontally with a speed of 250 m/s. With what speed (in m/s) does the cannon recoil from the blast?
6. An ice skating couple are playing on the ice. The 75 kg man gets a good start (5.0 m/s) skating toward the 60 kg woman, who is moving in the same direction at 2.0 m/s. After grabbing her hand and fligging her forward, he is still moving at 1 m/s in the same direction. How fast (in m/s) has he managed to get the woman moving?
7. In the previous question, energy is not conserved. What is the change in kinetic energy during the "collision" (in J)?
8. Which of the following best explains what happened when the man and woman in the previous questions "collided"?
a) They had a perfectly elastic collision
b) They had a perfectly inelastic collision
c) The man converted some of his internal energy into kinetic energy
d) The woman experienced an elastic collision but the man experienced an inelastic collision
9. You find yourself stuck in outer space with nothing but your physics book and a space suit. You have a mass of 100 kg in your suit, and your physics book has a mass of 2.50 kg. In order to make it back to your stationary spaceship before running out of air, you must move at 0.200 m/s. How fast (in m/s) do you have to throw your physics book to achieve this speed?
10. In the previous question, which direction should you throw your book?
a) At your ship
b) Away from your ship
c) Perpendicular to your path
d) In the nearest trash can :-)
2. If the rifle in the previous problem was held by a man with a weight of 700 N, what is the recoil speed (in m/s) of the man (with the rifle)?
3. If the bullet in the previous problem sticks in a 1.0 kg block of wood, what is the speed (in m/s) of the block (plus bullet) after the impact?
4. A 25.0 kg child on a sled slides down a hill, reaching a speed of 5.00 m/s. At the bottom of the hill, the child's inattentive, 75.0 kg father is standing still. When the child reaches the father, the father is knocked onto the sled. What is the sled's new speed (in m/s)?
5. A 300 kg cannon sits on a frozen lake. It fires a 6.00 kg cannonball horizontally with a speed of 250 m/s. With what speed (in m/s) does the cannon recoil from the blast?
6. An ice skating couple are playing on the ice. The 75 kg man gets a good start (5.0 m/s) skating toward the 60 kg woman, who is moving in the same direction at 2.0 m/s. After grabbing her hand and fligging her forward, he is still moving at 1 m/s in the same direction. How fast (in m/s) has he managed to get the woman moving?
7. In the previous question, energy is not conserved. What is the change in kinetic energy during the "collision" (in J)?
8. Which of the following best explains what happened when the man and woman in the previous questions "collided"?
a) They had a perfectly elastic collision
b) They had a perfectly inelastic collision
c) The man converted some of his internal energy into kinetic energy
d) The woman experienced an elastic collision but the man experienced an inelastic collision
9. You find yourself stuck in outer space with nothing but your physics book and a space suit. You have a mass of 100 kg in your suit, and your physics book has a mass of 2.50 kg. In order to make it back to your stationary spaceship before running out of air, you must move at 0.200 m/s. How fast (in m/s) do you have to throw your physics book to achieve this speed?
10. In the previous question, which direction should you throw your book?
a) At your ship
b) Away from your ship
c) Perpendicular to your path
d) In the nearest trash can :-)