How do i do this problem

Explain how plate tectonics have changed earth’s surface over time. include the role of plate tectonics in the creation of landforms.

If you touch a hot light bulb and get burned, that is an example of a. radiation b. convection c. conduction

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?