Most of the energy used by light on earth comes from

A 2-kg ball is thrown at 9 m/s. What is the ball's momentum?

If a magnet is broken into two pieces, what happens to the magnetic poles? Neither piece will have any magnetic poles. Both pieces will have the same, singular pole. Each piece will have a north pole and a south pole.

Since sound travels faster in warm air, the speed of sound near the ground is increased, leading to a gradual reflection of sound waves. True or False?

I have to match 1-9 with the words listed below 1. made of two protons and two neutrons 2. similar to an electron; positive charge 3. orbits nucleus; negative charge 4. bundle of energy; zero charge 5. found in nucleus; positive charge 6.

A carbon rod with a radius of 2.1 mm is used to make a resistor. The resistivity of this material is 3.2 * 10-5 Ω · m. What length of the carbon rod should be used to make a 13.7 Ω resistor?

What are three common forms of work in science

A boat travels north across a river at a velocity of 22 meters/second with respect to the water. The river's velocity is 2.2 meters/second to the east. What is the resultant velocity of the boat, as measured from the land?

The multiple reflection of a single sound wave is a/an a. reverberation. b. echo. c. diffraction. d. refraction.

Which of the following methods of improving air quality does not require advanced technology?

What is the process of finding the density of a liquid