A uniform rod (mass m = 1.0 kg and length L = 2.0 m) pivoted at one end oscillates in a vertical plane as shown below. The period of oscillation (in s) is approximately
?
?
a.
4.0.
b.
1.6.
c.
3.2.
d.
2.3.
e.
2.0.
d
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A wave has peaks and troughs that can move matter up and down when the wave interacts with matter. The frequency of a wave is
A) the number of peaks passing by any point each second. B) the speed at which a wave moves through space. C) the distance between two adjacent peaks of a wave.
At what rate is thermal energy generated in the 30-? resistor?
a.
20 W
b.
27 W
c.
60 W
d.
13 W
e.
30 W
An industrial fabrication process stamps out thin metal pieces, each in the shape of a square with a circular hole in the middle, from a large thin sheet. These pieces are mounted in a large machine
As these pieces heat up during regular machine operation, the diameter of the circular hole will A) decrease. B) stay the same. C) increase. D) behave unpredictably causing the machine to malfunction.
The H-R diagram is a diagram plotting the stars according to their
A. luminosity and temperature. B. spectral type and temperature. C. mass and diameter. D. brightness and luminosity class. E. apparent brightness and temperature.