Will flow from an object with higher temperature to an object with lower temperature.
a. heat
b. work
c. internal energy

Is there a point between a 10 nc charge and a 20 nc charge at which the electric field is zero?

If you put a helium-filled balloon in the refrigerator, what will happen?

Ahot-air balloon takes off from the ground traveling vertically with a constant upward acceleration of magnitude g/4. after time interval δt, a crew member releases a ballast sandbag from the basket attached to the balloon. how many seconds does it take the sandbag to reach the ground? (express your answer in terms of δt)