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

Physics & Space Science

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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?

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In the context of planetology, explain the heat of formation

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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.

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