A roller coaster climbs up a hill at 4m/s and then zips down the hill at 30 m/s. the momentum of the roller coaster a. is greater up the hill than down the hill
b. is greater down the hill than up the hill
c. remains the same throughout the ride
d. is zero throughout the ride.​

Select the word from the list that best fits the definition classification of most stars on the h-r diagram

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?

What’s #16 asking and how do i solve it?