Find the magnetic energy stored in the air gap between two very large magnetic pole pieces, one North, one South, each with an area of 100 cm2 . Assume the 0.05-T magnetic field is uniform within the 2-cm gap
0.2 J
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This figure shows the Cepheid period-luminosity relation. What is the approximate luminosity of a Cepheid star that varies in brightness with a period of 10 days?
A) about 1000 times the luminosity of the Sun B) about 3000 times the luminosity of the Sun C) about 10,000 times the luminosity of the Sun D) about 30,000 times the luminosity of the Sun
The Big Bang predicts that one in four atoms in the universe is helium
Indicate whether the statement is true or false
A 500-N object sits on the small piston of a hydraulic machine. The small piston has an area of 2.0 cm2. If the large piston has an area of 40 cm2, how much weight can the large piston support? Assume the pistons each have negligible weight
A) 25 N B) 500 N C) 10000 N D) 40000 N
An LCR circuit has resistance R0, inductance L0, and capacitance C0 . If the resistance value is now tripled, which values of inductance and capacitance will result in the same resonant frequency as before?
a. 3L0, C0 b. L0/3, C0/3 c. 3L0, 3C0 d. 3L0, C0/3