Warm water is generally less dense than cold water. the mass of a ship increases as it is loaded with cargo. if a ship will be sailing through warm and cold water, what should people think about as they load the ship with cargo?

Aman throws a football straight into the air. as it rises, it slows down. which type of energy is the football gaining?

If an astronaut takes an object to the moon the following is true (choose only one). a the mass will change but the weight will be the same. b both the mass and the weight of the object will be the same. c the weight will change but the mass will be the same. d both the mass and the weight of the object will change.

A100-watt light bulb illuminates a solar cell. the electricity from the solar cell operates a water pump that delivers 1 watt of power. what is the efficiency of the system?