How can we mathematically express Newton's law of gravity? (In the following, F is the force of Gravity, G is a constant; m and M are the masses or two bodies (such as Earth and the Sun); and r is the distance between the centers of mass of the two bodies.)
A. F = GMm/r2
B. F = Gm2M/r2
C. F = GMm/r3
D. F = GMm/r
Answer: A
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RLC Circuits: A 120-V rms voltage at 2000 Hz is applied to a 6.0-mH inductor, a 2.0-?F capacitor, and a 200-? resistor. What is the rms value of the current in this circuit?
A. 1.5 A B. 0.48 A C. 2.5 A D. 3.5 A E. 0.59 A
The recent gradual rise in the Earth's average surface temperature is commonly referred to as
A) global warming B) the greenhouse effect C) ozone depletion D) global heating
Betelgeuse is a red supergiant star in the constellation Orion. It radiates heat at the rate of 2.70 × 1030 W and has a surface temperature of 3000 K
Assuming that it is a perfect emitter, what is the radius of Betelgeuse? The Stefan-Boltzmann constant is 5.670 × 10-8 W/m2 • K4. A) 7.80 × 1010 m B) 8.70 × 1010 m C) 1.40 × 1011 m D) 1.90 × 1011 m E) 2.16 × 1011 m
A stopping potential of 0.50 V is required when a phototube is illuminated with monochromatic light of wavelength 590 nm
Monochromatic light of a different wavelength is now shown on the tube, and the stopping potential is measured to be 2.30 V. What is the wavelength of this new light? (c = 3.00 × 108 m/s, e = - 1.60 × 10-19 C, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 320 nm B) 300 nm C) 340 nm D) 360 nm E) 410 nm