An LR circuit contains an ideal 60-V battery, a 42-H inductor having no resistance, a 24-? resistor, and a switch S, all in series
Initially, the switch is open and has been open for a very long time. At time t = 0 s, the switch is suddenly closed. How long after closing the switch will the potential difference across the inductor be 24 V?
A) 1.6 s
B) 1.4 s
C) 1.8 s
D) 1.9 s
E) 2.1 s
Answer: A
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Satellite Motion: A satellite of mass 500 kg orbits the earth with a period of 6000 s. The earth has a mass of 5.97 × 1024 kg, a radius of 6.38 × 106 m, and G = 6.67 × 10-11 N ? m2/kg2.(a) Calculate the magnitude of the earth's gravitational force on the satellite.(b) Determine the altitude of the satellite above the earth's surface.
What will be an ideal response?
In comparing first magnitude Deneb with second magnitude Polaris, we find that:
A) Polaris is in reality much more luminous. B) Deneb must be much hotter than Polaris. C) Deneb appears 2.5 times brighter to us than does Polaris. D) Polaris is really 100 times brighter than nearby Deneb. E) Deneb is really much closer than Polaris.
A 7.5 × 1014 Hz laser emits a 7.7-?s pulse, 5.0 mm in diameter, with a beam energy density of 0.51 J/m3
What is the amplitude of the electric field of the emitted waves? (c = 3.00 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2) A) 120 kV/m B) 340 kV/m C) 480 kV/m D) 240 kV/m E) 150 kV/m
For the mercury in a thermometer to expand from 4.00 cm3 to 4.10 cm3, what change in temperature is necessary? The mercury has a volume expansion coefficient of 1.80 × 10-4 K-1
A) 400 C° B) 140 C° C) 14 C° D) 8.2 C°