Calculate the potential energy of a five kg object sitting at the top of a 2 m ramp

The sun generates both mechanical and electromagnetic waves. which statement about those wave is true?

In science and physics what is the standard unit of measure for speed?

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?