Consider how the Moon moves through the Solar System and complete the following sentence. The Moon orbits the Sun
A) once a month.
B) once a year.
C) once a day.
B) once a year.
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A refrigerator uses 40.0 J of work to extract heat from a heat reservoir at 
If the coefficient of performance of the refrigerator is 2.10, then how much heat is discharged out of the refrigerator at a higher temperature?
A. 52.0 J B. 66.0 J C. 86.0 J D. 124 J
A simple circuit has a total resistance of 30 ?. If a 2.0-A current is maintained in this circuit, how much energy is dissipated in this circuit in 4.0 seconds?
A) 24 J B) 4.8 J C) 48 J D) 480 J E) 6.0 J
An 8 000-kg aluminum flagpole 100-m high is heated by the sun from a temperature of 10°C to 20°C. Find the increase in internal energy (in J) of the aluminum. (The coefficient of linear expansion is 24 × 10^?6 (°C)?1, the density is 2.7 × 10^3 kg/m3, and the specific heat of aluminum is 0.215 cal/g/°C.)
a. 7.2 × 10^5 b. 7.2 × 10^7 c. 7.2 × 10^3 d. 7.2 × 10^1 e. 7.2 × 10^2
If Fig. 39.2 represents a planet with the same period as Earth, how long does it take for the planet to move from one dot to the next?