Help, please! I really don't understand potential and kinetic energy

To create electromagnetic induction, which of the following has to move? a. a wire b. a magnet c. a transformer d. either a or b

If the textbook weighs 19.6 newtons on venus,what is the strength of gravity on venus?

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?