Which one of the following has exactly 3 significant figures

Energy is the ability to A. do work. B. exert force. C. transfer heat. D. create or destroy matter.

List five objects that produce waves with a large amplitude and five that produce waves with a small amplitude.

Two friends whisper at a volume of 20 decibels. Later, they converse at a volume of 40 decibels. How much greater is the energy intensity of the conversation compared to the whisper? A. 20 times B. 10 times C. 1,000 times D. 100 times

Which reaction fuels the burning of the sun

A conducting sphere of radius r1 = 0.21 m has a total charge of Q = 2.9 μC. A second uncharged conducting sphere of radius r2 = 0.48 m is then connected to the first by a thin conducting wire.

A sound from a source has an intensity of 270 db when it is 1 m from the source. what is the intensity of the sound when it is 3 m from the source?

What experimental term is it when a ruler is dropped to the floor?

Where is most of the energy from incoming waves focused? A. spit B. headland C. underwater D. barrier beach

Exoplanets (planets outside our solar system) are an active area of modern research. Suppose you read an article stating that there is a newly discovered planetary system with three planets.

A car with a mass 1200 kg accelerates at 1.89 m/s2. What is the total force exerted by the car on the road (answer in N to two decimal places) ?