Compared to spiral galaxies, elliptical galaxies are
A) redder and rounder.
B) redder and flattened.
C) bluer and rounder.
D) bluer and flattened.
E) always much smaller.
A
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A metal bar is used to conduct heat. When the temperature at one end is 82.0°C and at the other is 37.0°C, heat is transferred at a rate of 9 J/s. If the temperature of the hotter end is reduced to 55.7°C, what will be the rate of heat transfer?
a. 2.7 J/s b. 1.6 J/s c. 6.2 J/s d. 3.7 J/s e. 5.0 J/s
A charge of 5.0 pC is distributed uniformly on a spherical surface (radius = 2.0 cm), and a second charge of ?2.0 pC is distributed uniformly on a concentric spherical surface (radius = 4.0 cm). Determine the magnitude of the electric field 3.0 cm from the center of the two surfaces
a. 30 N/C b. 50 N/C c. 40 N/C d. 20 N/C e. 70 N/C
The resistance of a platinum wire is to be calibrated for low-temperature work. A platinum wire with resistance 2.000 W at 20°C is immersed in liquid nitrogen at 77 K (-196°C). If the temperature response of the platinum wire is linear, what is the expected resistance of the platinum wire at -196°C? [aplatinum = 3.92 × 10^-3 (°C)-1]
a. 0.153 W c. 3.69 W b. 1.768 W d. 0.307 W
A region of expanding air tends to
A) cool. B) warm. C) both of the these D) neither of these