What travels on a wave

When will humans evolve?

Which block has more thermal energy? if the blocks are placed in thermal contact, will the thermal engery of the blocks change?

On a frictionless air track, a blue glider with mass 0.200 kg is moving to the right with a speed of 8.00 m/s. It strikes a red glider that has mass 0.600 kg and that is initially at rest.

How many lenses does a microscope use?

How long would it take a 500 W electric motor to do 1.50 x 10^5 J of work?

What are the requirements of a practical fuel

A woman holds a book by placing it between her hands such that she presses at right angles to the front and back covers. The book has a mass of m = 1.7 kg and the coefficient of static friction between her hand and the book is μs = 0.52.

Tony has a mass of 50 kg, and his friend Sam has a mass of 45 kg. Assume that both friends push off on their rollerblades with the same force. Explain which boy will have greater acceleration.

Which part of your ear do sound waves enter through?

Why do scientist use different types of models to represent compounds