A 20.0 kg object is at rest, and then speeds up to 16.0 m/s. How much work was done on this system?

A. 320 J

B. 2,560 J

C. 2,880 J

D. 5,120 J

When a car accelerates from a standing start, the crash test dummy appears to be pressed backward into the seat cushion. Which of the following best explains why this happens? A. The crash test dummy gets lighter as the car accelerates. B.

What is necessary for a substance to be a conductor of electricity?

When a boat moves through the water, the waves in front of the boat bunch up, while the waves behind the boat spread out. this is an example of?

What is a change in the speed of an object called?

Tim adds salt as he starts to heat a pot of water to cook pasta. When the water is boiling, he notices the salt has dissolved

Which is an example of transfroming potential energy to kinetic

Place the ball in the plastic bag, and twist the top so the ball is secure in the bag. Wrap the twisted portion with tape so it stays tight. Use the hole punch or scissors to poke a hole in the part of the bag that's above the ball.

Choose The units of 1/4πε0 are: A. N2C2 B. N • m/C C. N2 • m2/C2 D. N • m2/C2 E. m2/C2

What does a fern ultimately depend on as an energy source?

According to the Doppler Effect, which statement is true about a sound as it approaches you and then moves away. A) As the source approaches you, the sound waves are compressed so the pitch of the noise increases.