What is the approximate weight of a 20-kg cannonball on earth?

a. 2 n

b. 20 n

c. 200 n

d. 2000 n?

The measured of the energy of motion of partical of matter

Two identical charges are separated by a distance d. If the distance between them is increased to 3d, what will happen to the force of repulsion between them? A) It will be one-ninth the original force. B) It will be one-third the original force.

How does natural selection impact competition

1. When driving in rain the road becomes the most slippery: Just after the rain quits Right after it starts to rain After it has rained for 20 minutes When the wind is blowing at least 25 mph

Describe the difference between average speed and constant speed

Imagine that you replace the block in the video with a happy or sad ball identical to the one used as a pendulum, so that the sad ball strikes a sad ball and the happy ball strikes a happy ball.

Under what conditions will an object experience a gravitational force? Under what conditions will an object experience an electric force? Under what conditions will an object experience a magnetic force?

A basketball player pushes down with a force of 34 N on a basketball that is inflated to a gauge pressure of 9 x 104 Pa. What is the diameter of contact between the ball! and the floor?

Match these terms with their definitions: 1. unit of electrical resistance ampere 2. unit of electromotive force or electrical potential ohm 3. unit for measuring the strength of an electric current volt 4. unit of electrical power watt

In which is momentum conserved: an elastic collision or an inelastic collision?