An inductor, battery, resistor, ammeter, and switch are connected in series. If the switch, initially open, is now closed, what is the current's final value?
a. zero
b. battery voltage divided by resistance
c. battery voltage times inductance
d. battery voltage divided by inductance
B
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How did Harlow Shapley use the period-luminosity relationship of RR Lyrae variables to determine the size of the Milky Way galaxy?
a. He determined the proper motion of globular clusters in the outer disk of the galaxy. b. He found the distances to individual variables free floating in the halo. c. He found the distances to open clusters found throughout the disk of the galaxy. d. He found the distances to globular clusters distributed about the center of the galaxy.
How much energy is in an 89.7 MHz photon of FM-radiation?
a. 2.2 × 10^?33 J b. 9.5 × 10^?27 J c. 7.4 × 10^?42 J d. 5.9 × 10^?26 J e. 3.7 × 10^?25 J
An object's _____ is the force that Earth's gravity exerts on the object
A) mass B) density C) weight D) volume
Why does the Sun emit neutrinos?
A) Solar flares create neutrinos with magnetic fields. B) Fusion in the Sun's core creates neutrinos. C) Convection releases neutrinos, which random walk through the radiation zone. D) The Sun was born with a supply of neutrinos that it gradually emits into space. E) The Sun does not emit neutrinos.