A perpetual motion machine can never be built because it is not possible to eliminate

A) Momentum

B) Inertia

C) Elasticity

D) Friction

1) what are 2 ways to increase gravity between 2 objects?

How far does light year travel in one year

Which of the following quantities are unknown? Select all that apply. Select all that apply. the initial speed of the alpha particle the charge of the alpha particle the value of the electric potential at the initial position of the alpha particle

What will one see during an annular eclipse?

How does friction affect the energy in a closed system of moving parts?

Why do marine west coast climates have much precipitation

Wright true or false: 1. A baseball has more momentum than a tennis ball traveling at the same speed. 2. A light ball has more inertia than a heavy ball 3. The less momentum a bowling ball has, the easier it is for that ball to knock down pins. 4.

The interference of two sound waves of slightly different frequencies produces

8. A force of 80 pounds on a rope is used to pull a box up a ramp inclined at 100 from the horizontal. The rope forms an angle of 330 with the horizontal. How much work is done pulling the box 25 feet along the ramp?

A raindrop has a mass of 5.4 * 10-7 kg and is falling near the surface of the earth. Calculate the magnitude of the gravitational force exerted (a) on the raindrop by the earth and (b) on the earth by the raindrop.