Physics Answers

Why do you tend to leam backward when carrying a heavy load in your arms?

How can a rocket change direction when it is far out in space and essentially in a vacuum?

At takeoff, a rocket launched vertically from Earth has 2500 kg, 1500 kg of which is fuel. (a) If the initial acceleration of the rocket os 4.9 m/s^2 and its fuel consumption is 15 kg/s, find the speed of the exhaust gases. (b) What is the final acceleration of the rocket? Ignore the variation of g with altitude.

A 0.224 kg billiard ball moving at a speed of 12.0 m/s strikes the side of the table at 30° with the horizontal. The ball rebounds at the same speed and angle. What is the change in momentum of the ball?

Relate the concept of restitution to the colliding star in the universe?

What is the importance of coefficient of restitution in a colliding body?

Describe a collision in which all kinetic energy is lost.

Why can a batter hit a pitched baseball further than a ball tossed in the air by the batter?

Mass A moving at 12 m/s hits Mass B which is initially at rest. Mass A is 7 kg while Mass B is 9 kg. What will their velocities be after (a) an elastic collision and (b) perfectly inelastic collision?

Two identical bumper cars A and B with a mass of 12 kg approach each other with velocities VA1 = 4.5 m/s and VB1 = 5.5 m/s. After the said collision, they moved together in a certain distance. What is the velocity as they moved together?