Albert Michelson is primarily remembered for
A) proving length contraction.
B) not being able to detect an "ether".
C) his theory published in 1916.
D) proving that the speed of light is not constant.
E) proving time dilation.
B
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Radiation: A sphere of surface area 1.25 m2 and emissivity 1.0 is at a temperature of 100°C. At what rate does it radiate heat into empty space? (? = 5.67 × 10-8 W/m2 ? K4)
A. 7.1 W B. 0.71 mW C. 1.4 kW D. 9.9 mW E. 3.7 W
How do astronomers measure the temperature of stars?
A. The inverse square law is used. B. By comparing the star's absolute and apparent brightness. C. The rate of change of the color of the star is measured. D. By looking at which absorption lines are present in the star's spectrum. E. Temperature is determined from the radius of the star that is measured by radar.
A series circuit consists of three identical lamps connected to a battery as shown in Figure OQ28.15. The switch S, originally open, is closed. What happens to the total power delivered to the lamps by the battery?
Density: The average density of blood is 1.06 × 103 kg/m3. If you donate a pint of blood to the Red Cross, how many grams of blood have you donated? (2.00 pt = 1.00 qt, 1.00 L = 1000 cm3, 1.00 qt = 0.947 L, and density is mass per unit volume.)
A. 502 g B. 0.502 g C. 5020 g D. 5.02 × 105 g E. 5.02 g