Ayoung man exerted a force of 900 newtons for 10 seconds to push his car that had ran out of gas. however he could not get the car to move. how much work did he do? a-9000 joules b-9000 watts c-90 joules d-90 watts e-no work was done

Work done is defined as product of force and displacement of point of application of force.

So here we will have

now since here after applying the force the car is not displaced from its position

So here we have

d = 0

so work done is given as

so there is no work done in this case

graph slopes whilst gas cools, then it is flat whilst conensation to liquid happens, the coolong liquid then graphs as a slope when it solidifies graph is flat

latent heat

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.