50W of power is generated using 100J of work to move a box onto a shelf. How long did it take to move the box from the floor to the shelf?

time t = 2 seconds

Explanation:

Given that

Power P = 50W

Energy E = 100J

How long did it take to move the box from the floor to the shelf ? This implies time taken.

Power is defined as the rate at which work is done. I.e

P = W.D/t

Where work done = energy

50 = 100/t

Make t the subject of formula

t = 100/50

t = 2 second

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.

i already answered it by 34/s