A moving object has a kinetic energy of 20 J. if it's velocity doubles, it's kinetic energy would be

1) 40 J

2) 60 J

3) 80 J

4) 100 J

Will a non-metal replace a metal?

What is the difference in charges on a balloon rubbed in your hair and a glass rod rubbed with silk?

What happens to the density of a substance when it's heated? Explain?

Which represents a type of mechanical wave? A. gamma rays B. infrared light C. telemetry waves D. water waves

if three resistors are connected in series each have the same value of 5 ohms what is the total resistance

Light travels 186 000 miles per second. how many miles dose light travel in one year

How long can you play tennis on the 949kJ of energy in a candy bar? Assume that the average power consumption for a person playing tennis is 440W.

Consider a situation where you are playing air hockey with a friend. The table shoots small streams of air upward to keep the puck afloat and to minimize friction. When you barely tap the puck forward, it A. slows and stops. B.

At room temperature of 30 degree celsius, a glass of water takes one minute to cool from 80 degree celsius to 60 degree Celsius. How long will it take to further cool from 60 degree celsius to 50 degree celsius?

You are traveling in a spaceship at a speed of 0.70c away from Earth. You send a laser beam toward the Earth traveling at velocity c relative to you. What do observers on the Earth measure for the speed of the laser beam?