In an elastic collision between two bodies of equal mass, with body 2 initially at rest, body 1 moves off at angle q relative to the direction of its initial velocity and body 2 at angle f. The sine of the sum of q and f, sin(q + f), is equal to
a. 0.
b. 0.500.
c. 0.707.
d. 0.866.
e. 1.00.
E
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Friction: 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?
Fill in the blank(s) with the appropriate word(s).
According to the second law of thermodynamics, which of the following applies to the heat received from a high temperature reservoir by a heat engine operating in a complete cycle?
a. must be completely converted to work b. equals the entropy increase c. converted completely into internal energy d. cannot be completely converted to work
Because Earth's axis of rotation is inclined 23.4 degrees from vertical, the Sun moves into the northern sky in the spring and into the southern sky in the fall
a. True b. False Indicate whether the statement is true or false
Most extrasolar planets are hot Jupiters, discovered in the infrared by the Spitzer Space telescope
Indicate whether the statement is true or false