Acertain sound level increases by an additional 20 db. by how much does the intensity increase?

A1000-kg weather rocket is launched straight up. the rocket motor provides a constant acceleration for 16-s, then the motor stops. the rocket altitude 20-s after launch is 510-m. you can ignore any effects of air resistance. a. what was the rocket’s acceleration during the first 16-s? b. what is the rocket’s speed as it passes through a cloud 5100-m above the ground?

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

The total amount of energy contained in an object