The term terminator refers to the boundary line dividing day and night on the surface of a planet or moon. In this experiment, it is the line between the bright and dark side of the Moon. State the phase of the Moon when the terminator is the (a) sunrise line, (b) sunset line
(a) waxing phase; (b) waning phase.
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An engineer uses a river 
to cool his electrical plant which heats water with a boiler operating at 
What’s the maximal performance (in terms of efficiency) theoretically possible for this electrical plant?
A. 64% B. 36% C. 27% D. 73%
At which lunar phase(s) are tides most pronounced (e.g., the highest high tides)?
A) first quarter B) new Moon C) full Moon D) both new and full Moons E) both first and third quarters
A long, straight wire carrying a current is placed along the y-axis
If the direction of the current is in the +y direction, what is the direction of the magnetic field due to this wire as you view it in such a way that the current is coming directly toward you? A) clockwise, around the x-axis B) counterclockwise, around the x-axis C) counterclockwise, around the z-axis D) counterclockwise, around the y-axis E) clockwise, around the y-axis
A bulldozer attempts to drag a log weighing 500 N along the rough horizontal ground. The cable attached to the log makes an angle of 30° above the ground. The coefficient of static friction between the log and the ground is 0
50, and the coefficient of kinetic friction is 0.35. What minimum tension is required in the cable in order for the log to begin to slide?