A roller coaster of mass 80 kg is moving with a speed of 20 m/s at position A. The vertical height above ground level at position A is 200m. Neglect friction. What is the total mechanical energy of roller coaster at point C?

Light traveling in a medium with a refractive index 1.19 is incident on a plate of another medium with index of refraction 1.79. at what angle of incidence is the reflected light fully polarized?

Holes drilled several kilometers into earth’s crust provide direct evidence about earth’s interior in the form of

Agroup of monkeys is trying to cross the river in a rowboat. the maximum buoyant force on the rowboat is 2,000 n. the weight of the rowboat is 1,000 n. each monkey has a weight of 150 n. how many monkeys can safely cross in the rowboat at one time? explain your reasoning, including any calculations you used to find the answer.