Physics Questions & Answers

Physics Questions & Answers a 2 Kg ball is thrown at 3m/s. what is the balls momentum? - CORRECT ANSWER- 6 kg x m/s a 4.0 kg ball has momentum of 20.0 kg x m/s. what is the balls speed? - CORRECT ANSWER5.0 m/s a ball is moving at 6.0 m/s and has a momentum of 24.0 kg x m/s. what is the balls mass? - CORRECT ANSWER- 4.0 kg a cannonball shot from a long-barrel cannon travels faster than on shot from a short-barrel cannon because the cannon receives a greater - CORRECT ANSWER- Impulse A car is traveling along the highway needs a certain amount of force exerted on it to stop. More stopping force may be required when the car has - CORRECT ANSWER- less stopping distance, more momentum, more mass A collision is considered elastic if - CORRECT ANSWER- there is no lasting deformation, the objects don't stick together, the objects that collide don't get warmer, after the collision, the objects have the same shape as before the collision. A freight train rolls along a track with considerable momentum. If it were to roll at the same speed but has twice as much mass, its momentum would be - CORRECT ANSWER- doubled a meteor that originally was headed south breaks up into two chunks. One of the chunks moves southwest, the second chunk was not immediately found, but scientists guesses that they should look for an object heading - CORRECT ANSWER- Southeast A moving freight car runs into an identical car at rest on the track. The cars couple together. Compared to the velocity of the first car before the collision, the velocity of the combined cars after the collision is: - CORRECT ANSWER- one half as large a piece of putty and a rubber ball have the same mass. If you drop them from the same height, which object will produce a greater impulse and why? - CORRECT ANSWER- The rubber ball will produce a greater impulse because it will stop when it hits the ground