Which of these statements are true? Explain why below: a) If an elastic collision occurs, then the change in total momentum is unpredictable. b) If an elastic collision occurs, then the total momentum is increased by the collision. c) If an elastic collision occurs, then the total momentum is decreased by the collision. d) If an elastic collision occurs, then the total momentum remains essentially unchanged by the collision. Explanation:___________________________________________________________________________________________________________________________________________________________________________________________________________________________________

a) What type of collision is this? How do you know? b) What is the speed of the two intertwined bikes after the collision? c) In what direction are they moving after the collision?

Q18

Question 5 Three questions have the same general description. A 2400 kg truck is traveling at 24 m/s and runs into the back of a 1200 kg Mini Cooper. Immediately after the collision, the two cars are stuck together and moving at 22 m/s. What was the average force on the truck if the collision happened in 0.02 seconds? Your answer: O 96 N O 1056 N O 240,000 N O 2,640,000N O 2,880,000N

3.) When two gliders collide on an air track, which statement will be true: A) The momentum of any single glider is conserved. 3) B) Friction does not exist. C) The sum of momentum (both gliders) BEFORE collision equals the sum of momentum AFTER. D) All the statements above are false. 4.) A skydiver is at a height of 35,000 ft and is falling at 80 miles per hour. The skydiver has: A) Only Potential energy B) Only Kinetic energy 4). C) Potential energy AND Kinetic energy D) Neither form of energy

Two cars have the same mass. Car 1 is travelling northward at a speed of 45 mi/hr. Car 2 is travelling southward at a speed of 45 mi/hr. The cars a)  have the same momentum and kinetic energy. b)  have the same momentum but different kinetic energies. c)  have different momenta but the same kinetic energy. d)  Have different momenta and kinetic energy.

Question 8. In a classroom demonstration, two identical low-friction dynamics carts are pushed toward each other such that they are travelling at the same speed when they collide. Immediately after the collision the carts come to a complete stop. The teacher challenges his students to describe this collision. Some of the students' descriptions are provided below. I II III IV Student Descriptions of the Collision of Two Carts Before the collision occurs the carts have the same momentum. Before the collision occurs the carts have the same kinetic energy. This collision is an example of an elastic collision. This collision is an example of an inelastic collision. The descriptions that are appropriate for this collision are A. I and III B. II and III C. II and IV D. I and IV

Which of the following is a unit of impulse? A) N.s B)kg.m/s^2 C)N.m D)N/s E) N/m