It takes 8 seconds for a pulley system to lift a load that weights 400n to a height of 10 m. how much power is required? .

a. 400 watts.

b. 3200 watts.

c. 500 watts.

d. 80 watts

C. 500 watts

Explanation:

power is defined as the rate of work done

When a force causes a object to move, work is being done on the object by the force.

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.