(25 points.) in what way does an earthquake provide evidence about the layers of earth?

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?

Abar magnet cut in half will form a total ofpoles. a)fourb)eightc)two

What is the speed vfinal of the electron when it is 10.0 cm from charge 1?