The position of an absorption or emission line is useful in determining the ____
a. temperature of an object
b. distance to an object
c. chemical composition of an object
d. motion of an object across the observer's line of sight
e. motion of an object toward or away from the observer
c
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A ballerina spins initially at 1.5 revolutions/second when her arms are extended. She then draws in her arms to her body and her moment of inertia becomes 0.88 kg-m2 and her angular speed increases to 4.0 rev/s
Determine her initial moment of inertia.
In the distant past, the temperature of the universe was
A) hotter than it is today. B) cooler than it is today. C) absolute zero (0 K). D) 3 K.
For an LRC series circuit containing a resistance of 11.0-?, a capacitance of 2.0-?F, and an inductance of 24.0 H, what frequency is needed to minimize the impedance?
A) 0.023 kHz B) 0.14 kHz C) 10 kHz D) 1.7 kHz
A series LC circuit contains a 100 mH inductor, a 36.0 mF capacitor and a 12 V battery. The frequency of the electromagnetic oscillations in the circuit is
a. 5.73 × 10^?4 Hz. b. 9.55 × 10^?3 Hz. c. 0.442 Hz. d. 2.65 Hz. e. 44.0 Hz.