He maximum strength of the earth's magnetic field is about 6.9 x 10-5 t near the south magnetic pole. suppose we want to utilize this field with a rotating coil to generate 87.2-hz ac electricity. what is the minimum number of turns (area per turn = 0.013 m2) that the coil must have to produce an rms voltage of 120 v?

When the velocity of an object is doubled, by what factor is its momentum changed? by what factor is its kinetic energy changed? a) the momentum is zero. b) the momentum is not zero. c) difficult to say.

The plum pudding model of the atom states that ?

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?