Aperson is riding a bike at 5 m/s due west. the mass of the rider + bike is 95 kg. what is the magnitude of its momentum?

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

Why are graphs useful when interpreting data

Two resistors r1 and r2 may be connected either in series or parallel across an ideal battery with emf ε. we desire the rate of energy dissipation of the parallel combination to be 8.75 times that of the series combination. if r1 = 105 ω, what are the (a) smaller and (b) larger of the two values of r2 that result in that dissipation rate?