What is power?

A. The efficiency of a machine

B. The number of machines used

C. The amount of work done

D. The rate of doing work

John is traveling north at 20 meters/second and his friend Betty is traveling south at 20 meters/second. If north is the positive direction, what are John and Betty's speeds? A. - 20 meters/second, 20 meters/second B.

If a storm is 7.5 kilometers away, how much time is expected between observations of lightning and thunder? Round your answer to one decimal place. seconds

In which of the following situations is consciousness NOT involved?

Which object has more gravitational potential energy? ball 35 kg dropping 50m or ball 55kg dropping 30m?

a ball was projected in such a way that it attained the maximum horizontal distance with a velocity of 20m/s calculate the vertical distance reached

What happens to the resistance of a filament if it is replaced by a shorter wire?

One group of scientists feel that global warming affects the frequency of hurricanes. Another group of scientists believe that global warming does not affect the frequency of hurricanes, but it makes the average hurricane stronger.

In an experiment, all participants receive a treatment but those in the control group recieves a false treatments

When the volume increased, what happened to the density?

8. Chemical weathering occurs more rapidly in what kind of climates? A. Desertlike B. Cold with high snowfall amounts C. Cool and dry D. Warm with abundant rainfall