Mechanics | Relativity Answers

Ball 1 is moving toward you at 11 m/s , and you decide to throw ball 2 at it to make it reverse its velocity. The balls collide head-on, and the coefficient of restitution for the collision is 0.90. Ball 1 has an inertia of 0.500 kg and ball 2 has an inertia of 0.650 kg . Call the direction of motion in which we throw ball 2 the +x direction.
1.How fast must ball 2 be traveling in order to reverse the velocity of ball 1?
2.What is the initial relative speed of the two balls?
3.How do the balls initially move?
4.What is their reduced inertia?
5.What percentage of the original kinetic energy is convertible?
6.What is the x-component of the final velocity of the ball 1 immediately after the collision
7.What is the x-component of the final velocity of the ball 2 immediately after the collision?

If the puck has a mass of 0.1kg and Dan can only apply 200 Newton’s of force, how fast with the puck accelerate

Your concave plate with a mass of 2 kg is spinning on top the table with a velocity of 1.5
m/s for 2 seconds then your brother came and spins it more creating a velocity of 4 m/s
for 6 seconds. What is the angular acceleration of your concave when you are spinning it
and the angular acceleration after your brother spins it?

A 3,000 kilogram car hit with a force of 40,000 Newtons

A machine with a mass of 4kg fires a 45g bullet at a speed of 100m/s...
What is the recoil speed of the machine gun

A stone is released freely from a 200 m tall building. Calculate the final veocity of the stone just before touching the ground. Ignore the friction of air. (use g = 9.81 ms-1)

A ball is in free fall. Upward is taken to be the positive direction. The displacement of the ball during a short time interval is: ( )

A dog sits 1.40 m from the center of a merry- go-round with an angular speed of 1.94 rad/s. If the magnitude of the force that maintains
the dog’s circular motion is 36.2 N, what is the dog’s mass?
Answer in units of kg.

Find the hydrostatic pressure exerted on an object that is 4.45 m below the surface of gasoline and its absolute pressure. The density of gasoline is 680 kg/m3.

Water flows through a pipe with an area of 13 in2 with a speed of 12 ft/s. It then enters a smaller pipe with an area of 3.1 in2. What is the speed of the water as it flows through the smaller pipe?