An extended period of well-below-average temperatures is known as a

A. drought.

B. ice age.

C. cold wave.

D. draft.

Which of the following is the best sign that cooking pancake batter causes a chemical change

If you stand next to a wall on a frictionless skateboard and push the wall with a force of 50 N, how hard does the wall push on you? Express your answer to two significant figures and include the appropriate units.

Is the term used to describe an object with enough orbital energy to escape earth completely?

What happens when electrical energy is used to power stereo speakers? A. Energy is neither lost nor gained as electrical energy is transformed into the energy of sound. B. Energy is gained as electrical energy transforms into the energy of sound. C.

Felipe drives his car at a velocity of 28 m/s. He applies the brake, which slows the vehicle down at a rate of 6.4 m/s2 and causes it to slow to a stop. How long does it take for the car to stop

Why do different elements emit different colors of light

In an experiment, 108 J of work was done on a closed system. During this phase of the experiment, 79 J of heat energy was added to the system. What was the total change in the internal energy of the system?

J. J. Thomsons experiments provided evidence that an atom

How does our sun differ from most other main sequence stars?

A large body of air hats has similar properties of a temperature and moisture is a