8,000,000 kg of water are at the verge of dropping over Niagara Falls to the rocks 50.0 meters below. What is the change in gravitational potential energy as the water splashes on the rocks below?

If you were to compare three stars with the same surface temperature, with one star being a giant, another a supergiant, and the third a main-sequence star, how would their radii compare to one another?

Suppose a runner completes one lap around a 400-m track in a time of 50 s. Calculate the average speed of the runner.

An atomic nucleus may contain several protons, each of which has a positive charge. Which type of force allows the nucleus to be stable?

As a train accelerates uniformly, it passes successive 5-kilometer markers while traveling at velocities 10 m/s and 25 m/s. what is the velocity in km/h when it passes the next marker? round to nearest tenth of a km/h.

Eric has just had a sandwich that contained the equivalent of 1.80 mol of glucose the standard molar entropy of reaction is 182 j k-1 mol-1.

Why is it useful to calculate average speed?

Which describes freefall

Suppose you were examining a pulsing radio signal from a stellar remnant in a distant part of the Milky Way.

Which pair of properties do all liquids have? A) Fixed volume; no definite shape B) Conducts electricity well; compressible C) Compressible; brittle D) Good conductor of heat; takes shape of container

0.2000 kg of water at 20.00°C is contained in a 0.1000-kg copper container. The container is shaken vigorously for 10.00 minutes to cause the temperature to rise to 22.00°C. Calculate the work done on the system and the heat supplied to the system.