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# Conservation of Energy

### Conservation of momentum and kinetic energy: Superball and elastic collisions

A superball has collisions that are nearly perfectly elastic. A superball of mass M is dropped from rest from a height h (where h >> the size of the superball) together with a smaller marble, of mass m; the marble is initially just a little above the top of the superball and remains right over it throughout the fall. The superba

### average friction force that will stop the bullet hitting a tree?

A 5g bullet is shot (horizontally)and hits a tree at 600m/s^2 and goes into the tree at a depth 4cm. What is the average friction force that will stop the bullet?

### Energy and Conservation Laws: How much work is done

A rock weighs 100 lbs and is lifted 1 ft by a lever. How much work is done?

### Elastic Collision of Two Blocks

What are the velocities of each of the two blocks after they collide? See attached file for full problem description.

### Physics question Simple harmonic oscillator, Conservation of momentum, Gravitaional Attraction

1. A simple harmonic oscillator has a total energy of E. a.) Determine the kinetic and potential energies when the displacement is one half the amplitude. B.)For what value of the displacement does the kinetic energy equal the potential energy? 2.A 5.00g bullet moving with an initial speed of 400m/s is fired into and passes

### Working with conservation of mechanical energy.

A 12 kg block is released from rest on a 30 degree frictionless incline. Below is a block that can be compressed 2.0 cm by a force of 270 N. The block momentarily stops when it compresses the spring by 5.5 cm. How far does the block move down the incline from its rest position to this stopping point? What is the speed of the bl

### Calculating the velocity of a ball compressed into a spring.

In preparation for shooting a ball in a pinball machine, a spring (k= 675 N/m) is compressed by 0.0650 m relative to its unstrained length. The ball (m= 0.0585 kg) is at rest against the spring at point A. When the spring is released, the ball slides (without rolling) to point B, which is 0.300m higher than point A. How fast

### Working with 2-D collisions within a laboratory frame.

A particle of mass m and velocity Vo collides elastically with a particle of mass M initially at rest and is scattered through angle, A, in the center of mass system. a) Find the final velocity of m in the laboratory system. b) Find the fractional loss of kinetic energy of m.

### The Conservation of Momentum Applied to Moving Charges

Two identical particles of mass m carry a charge Q each. Initially one is at rest on a smooth horizontal plane and the other is projected along the plane directly towards the first particle from a large distance, with the speed v. Find the closest distance of approach.

### Determining Speed, Temperature and Thermal Energy

How do you determine the speed just before blocks collide? How do you determine the temperature rise that results from the collision? How do you determine the additional thermal energy that is generated as the blocks continue to move together after the collision?

### Lienard-Weichert Potentials for an Antenna

Is it possible to work out the Magnetic and electric fields of a loop antenna using the Lienard-Weichert potentials ? I would like a detailed derivation of how this is done