The first stars to form in our galaxy
a. had circular orbits.
b. had highly elongated elliptical orbits.
c. were population I stars.
d. all had orbits in the same plane.
e. formed the galactic clusters we see today.
B
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Two circular loops carry identical currents, but the radius of one loop is twice that of the other. How do the magnetic fields at the centers of the loops compare?
a) In both cases, the magnetic field at the center would be zero tesla. b) The magnetic field at the center of the larger loop is twice that at the center of the smaller loop. c) The magnetic field at the center of the larger loop is the same as that at the center of the smaller loop. d) The magnetic field at the center of the larger loop is one-half that at the center of the smaller loop. e) The magnetic field at the center of the larger loop is one-fourth that at the center of the smaller loop.
The circuit power factor of an RC circuit is 0.620. The rms value of the voltage applied to this signal is 120 V and the impedance is 200 ?. What is the average power of this circuit?
A) 44.6 W B) 89.2 W C) 60.0 W D) 0.620 W E) 124 W
The accident at Three Mile Island began when
A) the moderator malfunctioned so that the reaction got out of control. B) a water pump failed. C) the control rods didn't insert properly. D) the pressurizer ruptured [i.e., broke open] and there was no backup pressurizer to replace it. E) the heat exchanger failed to operate properly.
If the initial velocity of the glider or ball was not zero, how would your experimental value of g compare with the value you obtained by assuming the initial velocity was zero? For instance, suppose you accidentally gave the object a slight shove down the incline at the starting point. Would your calculated value for g be larger or smaller?