If 150 kcal of heat raises the temperature of 2.0 kg of a material by 400°F, what is the specific heat capacity of the material?
A) 1.35 kcal/kg ? °C
B) 0.75 kcal/kg ? °C
C) 0.34 kcal/kg ? °C
D) 0.19 kcal/kg ? °C
C
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Transformers: An ideal step-down transformer is needed to reduce a primary voltage of 120 V to 6.0 V. What must be the ratio of the number of turns in the secondary to the number of turns in the primary?
Fill in the blank(s) with the appropriate word(s).
A certain ac signal at 1000 Hz is applied across an inductor and a 100-? resistor. If the power factor of the circuit is 0.400, what is the impedance of this circuit?
A) 150 ? B) 200 ? C) 250 ? D) 100 ? E) 300 ?
If atmospheric refraction did not occur, how would the apparent time of sunrise and sunset be changed?
a. Both would be earlier. b. Both would be later. c. Sunrise would be earlier and sunset later. d. Sunrise would be later and sunset earlier.
How does a red giant compare to a main-sequence star of the same mass?
A) The red giant has higher surface temperature and higher luminosity. B) The red giant has higher luminosity but lower surface temperature. C) The red giant has lower surface temperature and lower luminosity. D) The red giant lower luminosity but higher surface temperature. E) Both stars have the same mass and therefore have the same surface temperature and luminosity.