The shape of the magnetic field around a bar magnet is very close to the shape of the electric field around a single positive charge
a. True
b. False
Indicate whether the statement is true or false
False
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How do astronomers measure the mass of a supermassive blackhole?
a) by comparing its apparent magnitude to its absolute brightness b) by comparing its X-ray luminosity to its radio luminosity c) using the formula E = mc2 d) by measuring the speed at which stars move in its vicinity e) by measuring its parallax
Why are several observations or trials taken for each measurement?
_______________ variable stars are useful in measuring the distance to globular clusters
Fill in the blank(s) with correct word
Phase Angles: A series ac circuit has a resistance of 2.0 k?, a capacitance of 8.0 ?F, and an inductance of 9.0 H. If the frequency of the alternating current is 4.0/? kHz, by what angle does the voltage lead the current?
A. +1.5 rad B. -1.8 rad C. +36 rad D. +3.1 rad E. -3.1 rad