Why athelets pushes the earth backwards with his feets and hands just before the race starts

A ball is thrown straight up. Taking the drag force of air into account, does it take longer for the ball to travel to the top of its motion or for it to fall back down again?

Water flows over a section of Niagara Falls at a rate of 1.2 * 106 kg/s and falls 29 m. The acceleration of gravity is 9.8 m/s 2. How many 80 W bulbs can be lit with this power?

Let's say a 0.001kg bullet moves with a speed of 1500 m/s. A pitcher claims he can throw a 0.15 kg baseball with as much momentum as that bullet. How fast would he have to throw the ball for this to be true?

The mass of an object is independent of its location. true or false

A string (L = 0.76 m) was used to generate standing waves. If the number of antinodes generated in the string was 3, the determine the wavelength.

A blank tells you what the different symbols and lines represent on a map

How well would a piece of hot metal heat the cool water?

Explain the difference between work and power.

What happened if a stranger come to you what will you do

Which internal heat source still generates heat within the terrestrial worlds today?