A heat pump has a coefficient of performance that is 60% of the Carnot heat pump coefficient of performance. The heat pump is used to heat a home to 24.0°C during the winter with the low temperature reservoir at the outdoor temperature
At which outdoor temperature would it be more efficient to add the energy directly to the interior of the home than use it to run the heat pump? A)
-25.2°C
B)
-154°C
C)
-40.0°C
D)
-83.4°C
E)
-4.00°C
B
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Why do nuclear fusion reactions only take place in the interior of a star?
a. The magnetic fields are strongest there. b. The temperature is the hottest in the center. c. The density of material is very high in the center. d. The temperature is the hottest in the center and the density of material is very high in the center. e. FALSE; Nuclear fusion reactions can take place in the core and corona where temperatures are high enough.
Triton and Pluto both probably originated in the Kuiper Belt
Indicate whether the statement is true or false
Assume the Heisenberg uncertainty principle can take the form ?E?t ? h/4B. How accurate can the position of an electron be made if its speed is 5 × 10^6 m/s and if the uncertainty in its energy is 10 eV?
a. 7.7 × 10^?18 m b. 1.3 × 10^?23 m c. 6.2 × 10^?15 m d. 1.6 × 10^?10 m e. 1.2 × 10^?9 m
Because of refraction, the Sun near sunset appears
A) higher in the sky. B) lower in the sky. C) farther away.