How many helium balloons would it take to get an Apple start floating in the air

You stand on a bathroom scale in a moving elevator. what happens to the scale reading if the cable holding the elevator suddenly breaks?

Why would a skier try to lower his center of gravity?

A small 25 kilogram canoe is floating downriver at a speed of 4 m/s. What is the canoe's kinetic energy?

A proton initially at rest is accelerated by a uniform electric field. The proton moves 5.62 cm in 1.15 x 10^-6 s. Find the voltage drop through which the proton moves. (Answer should be positive)

If a car and a bowling ball were thrown off a 100 foot cliff at the same time, which would hit the ground first?

A machine with a mechanical advantage of 10 is used to produce an output force of 250 newtons. What input force is applied to this machine

Why do you float in space

How does physical change affect the identity of a substance

A scientist pours grape juice on three identical white shirts He then uses three different cleaning products on the shirts and measures how clean they get what is the independent variable in this experiment

What part of the atom does nuclear radiation come from?