Atrain traveling 50 miles per hour leaves the station in detroit and travels 300 miles to boston how long did. it take ?

If a refrigerator is a heat pump that follows the first law of thermodynamics, how much heat was removed from food inside of the refrigerator if it released 380j of energy to the room?

An object resting on a table weighs 100 n. with what force is the object pushing on the table? with what force is the table pushing on the object? explain how you got your answer.

The first law of thermodynamics states that heat added to a system is neither created nor destroyed but is as it changes into other forms of energy.