What property of an object can you determine using mass and volume?

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

Debbie places two shopping carts in a cart corral she pushes the first cart which then pushes a second cart what force is being exerted

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?