Abullet of mass m is fired at a block of mass m hanging from a string. the bullet embeds itself in the block. this is an inelastic collision, in contrast to an elastic collision where energy is conserved. is the initial momentum of the bullet equal to the momentum of the bullet plus the block immediately after the collision? yesnoinsufficient information to answeris the initial kinetic energy of the bullet equal to the kinetic energy of the block plus bullet immediately after the collision? yesnoinsufficient information to answeris the initial kinetic energy of the bullet equal to the gravitational potential energy of the block plus bullet at the top of the swing? yesnoinsufficient information to answer

Answers:

Is the initial momentum of the bullet equal to the momentum of the bullet plus the block immediately after the collision? Yes

Is the initial kinetic energy of the bullet equal to the kinetic energy of the block plus bullet immediately after the collision? No

Is the initial kinetic energy of the bullet equal to the gravitational potential energy of the block plus bullet at the top of the swing? No

Explanation:

The main difference between elastic collision and inelastic collision is:

- In an elastic collision, both total momentum and total kinetic energy are conserved

- In an inelastic collision, the total momentum is conserved, while the total kinetic energy is not

In the problem, the collision is inelastic. According to these definitions, we can analyze each statement:

1) Is the initial momentum of the bullet equal to the momentum of the bullet plus the block immediately after the collision? Yes --> in fact, we said that the total momentum is conserved also in an inelastic collision.

2) Is the initial kinetic energy of the bullet equal to the kinetic energy of the block plus bullet immediately after the collision? No --> As we said, the total kinetic energy is not conserved in an inelastic collision.

3) Is the initial kinetic energy of the bullet equal to the gravitational potential energy of the block plus bullet at the top of the swing? No --> Since the total kinetic energy is not conserved in the collision, some of it is lost, so the final gravitational potential energy of the block+bullet will be smaller than the initial kinetic energy of the bullet.

iron would move it is magnetic there is a mag field around the current in the wire

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me