A temperature difference of 5 K is equal to
A. a difference of 9 on the Celsius scale.
B. a difference of 9 on the Fahrenheit scale.
C. a difference of 2.8 on the Rankine scale.
D. a difference of 0.5 on the Fahrenheit scale.
E. a difference of 2.8 on the Celsius scale.
Answer: B
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Under steady state conditions, a piece of wood 350 mm by 350 mm and 15 mm thick conducts heat through its thickness and loses no appreciable heat through its well-insulated sides
The rate of heat flow is measured to be 14.0 W when the temperature difference across its thickness is 28°C. Determine the thermal conductivity of this wood. A) 9.2 × 10-4 W/(m ? °C) B) 270 W/(m ? °C) C) 16 W/(m ? °C) D) 0.061 W/(m ? °C) E) 33 W/(m ? °C)
Star A is identical to Star B, except that Star A is twice as far from us as Star B. Therefore,
A) both stars have the same luminosity, but the apparent brightness of Star B is twice that of Star A. B) both stars have the same apparent brightness, but the luminosity of Star B is four times that of Star A. C) both stars have the same luminosity, but the apparent brightness of Star A is four times that of Star B. D) both stars have the same luminosity, but the apparent brightness of Star B is four times that of Star A.
If a 600-W heater carries a current of 4.0 A, what is the voltage across the ends of the heating element?
a. 2 400 V b. 150 V c. 300 V d. 0.0067 V e. 4.9 V
Kepler's first law states that the orbits of the planets around the Sun are
a. circles. b. ellipses. c. all lying in the same plane. d. none of these.