# Center of mass and momentum Questions and Answers

Physics
Center of mass and momentum Solutions
A pole is planted into the ground at a 38⁰ angle. At the end of the pole is a 500 N pot. What force would need to be added to the pole in the Y-direction to maintain mechanical equilibrium?
Physics
Center of mass and momentum Solutions
What is the moment of inertia of a uniform solid cylinder about its central axis of diameter d = 0.190 m, and total mass M = 1.65 kg? Show your work.
Physics
Center of mass and momentum Solutions
On a frictionless horizontal floor, two objects collide. Object A, which is moving in a velocity of 72 m/s, is 7 times of object B, which has a velocity of 40 m/s. Object A moves to the right while
Physics
Center of mass and momentum Solutions
Two masses collide on a frictionless horizontal floor and in a perfectly inelastic collision. Mass 1 is 4 times that of mass 2. Velocity of mass 1 = 12 m/s to the right while the velocity of mass 2 =
Physics
Center of mass and momentum Solutions
A 5.0 kg fish moving at 6.6 m/s eats a 1.5 kg fish at rest. Neglecting friction, what is the velocity of the fish after his lunch?
Physics
Center of mass and momentum Solutions
A 65 g bullet is shot at 400 m/s into a 3 kg block of wood at rest. How much kinetic energy is lost in this collision?
Physics
Center of mass and momentum Solutions
A 2.5 kg firework moving with a velocity of 5.6 m/s to the right explodes in mid-air into two pieces. One of the exploded pieces has a mass of 1.4 kg and a velocity of 16.4 m/s to the right. What is the speed of the other piece?
Physics
Center of mass and momentum Solutions
A bullet with a mass of 0.0063 kg and a speed of 748.0 m/s is fired so that it hits a block of wood with a mass of 0.233 kg that is initially at rest on a frictionless surface. The bullet flies into
Physics
Center of mass and momentum Solutions
A bullet with a mass of 0.0098 kg and a speed of 639.4 m/s is fired so that it hits a block of wood with a mass of 0.074 kg that is initially at rest on a frictionless surface. The bullet flies into
Physics
Center of mass and momentum Solutions
A 757 kg train car moving with a speed of 12.6 m/s to the right, crashes into a 2nd 1269 kg train car moving with a speed of 3.8 m/s to the right. The trains lock up and move together. What is the
Physics
Center of mass and momentum Solutions
A 10-g block slides with a velocity of 21 cm/s on a smooth level surface and makes a head-on collision with a 25 g block moving in the opposite direction with a velocity of 8 cm/s. If the collision is
Physics
Center of mass and momentum Solutions
A ballerina spins initially at 1.5 rev/s when her arms are extended. She then draws in her arms to her body and her moment of inertia becomes 0.88 kg · m², and her angular speed increases to 4.0