Which weighs more: A. A large bathtub filled to the brim with water B. A large bathtub filled to the brim with water with a battleship floating in it C. No difference: these two options weigh the same

Which type of wave can travel without a medium

What is a subatomic particle with a negative charge and very little mass?

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)