A 400-W computer (including its monitor) is turned on for 8.0 hours per day. If electricity costs 10¢ per kWh, how much does it cost to run the computer annually for a 365-day year?
A) $120
B) $1200
C) $15
D) $150
A
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In the context of planetology, explain the heat of formation
What will be an ideal response?
A box sits at rest on an inclined plank. How do the magnitudes of the normal force and the gravitational force exerted on the box compare? (Hints: What is the box’s acceleration? Draw a free-body diagram!)
A. 
B. 
C. 
D. 
E. We do not have enough information to answer.
Suppose you find an X-ray binary that exhibits X-ray bursts. Is it possible that the system's X-ray binary consists of a red giant and a black hole? Why or why not?
What will be an ideal response?
In a hydrogen atom, the electron makes a transition from the n = 8 to the n = 3 state. What is the wavelength of the emitted photon?
A) 9.54 × 10-7 m B) 1.13 × 10-6 m C) 3.12 × 10-7 m D) 4.52 × 10-6 m E) 6.34 × 10-7 m