A motorcycle drives up a steeply inclined ramp. The work done on the motorcycle by the Earth’s gravitational force is . 1. positive 2. negative 3. zero

Arotating space station is said to create “artificial gravity”—a loosely-defined term used for an acceleration that would be crudely similar to gravity. the outer wall of the rotating space station would become a floor for the astronauts, and centripetal acceleration supplied by the floor would allow astronauts to exercise and maintain muscle and bone strength more naturally than in non-rotating space environments. if the space station is 200 m in diameter, what angular velocity would produce an “artificial gravity” of 9.80 m/s^{2} 2 at the rim?

The voltage applied across a given parallel-plate capacitor is doubled. how is the energy stored in the capacitor affected?

How many neutrons does plutonium -196 with an atomic number of 78.