Kenny Klutz drops his physics book off his aunt’s high-rise balcony. It hits the ground below 1.5 seconds later? With what velocity does it hit? How high is the balcony?

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j ?

Standing side by side ,you and a friend step off a bridge at different times and fall for 1.6s to the water below.your friend goes first,and you follow after he has dropped a distance of 2.0m.when your friend hits the water,is the seperation between the two of you 2.0m or more than 2.0m? verify your answer with a calculation.

What sort of waves exhibit the doppler effect?