If mass A is 1.0 kg, mass B is 5.0 kg, and the frictionless pulley has a mass of 0.5 kg and a radius of 0.15 m, what is the amount of
downward force (in Newtons) acting on each mass?
a A= 9.81 N, B = 49.05 N
C. A=49.05 N, B = 9.81 N
b. A= 16.35 N, B = 16.35 N
d. A=9.81 N B = 16.35 N

Cathy is pedaling down a steep hill on her bicycle and wants to be able to coast up the next hill, which is 25 meters high, without pedaling. cathy and her bicycle have a mass of 75 kg. assuming her bicycle is 100% efficient, what would her speed have to be?

The atoms in a nickel crystal vibrate as harmonic oscillators with an angular frequency of 2.3 × 1013 rad/s. the mass of a nickel atom is 9.75 × 10-26 kg. what is the difference in energy between adjacent vibrational energy levels of nickel? (h = 6.626 × 10-34 j • s, , 1 ev = 1.60 × 10-19 j)

Select all the correct answers. which three statements about electromagnetic radiation are true?