At 10 cents per kilowatt-hour, how much does it cost to run a 100 watt lightbulb for 200 hours every month?
A) 20 cents per month
B) $20 per month
C) $2 per month
D) impossible to determine because we don't know the voltage
E) impossible to determine because we don't know the power
C
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Internal energy is a state function
Indicate whether the statement is true or false
What would you see if you were on the Moon during a solar eclipse?
What will be an ideal response?
The rigid body shown is rotated about an axis perpendicular to the paper and through the point P. If M = 0.40 kg, a = 30 cm, and b = 50 cm, how much work is required to take the body from rest to an angular speed of 5.0 rad/s? Neglect the mass of the connecting rods and treat the masses as particles
a.
2.9 J
b.
2.6 J
c.
3.1 J
d.
3.4 J
e.
1.6 J
Intensity: Why does the intensity of waves from a small source decrease with the square of the distance from the source?
A. The waves run out of energy as they travel. B. The waves spread out as they travel. C. The medium through which the waves travel absorbs the energy of the waves. D. The waves slow down as they travel away from the source. E. The frequency of the waves decreases as they get farther from the source.