Which of the following is not one of, nor follows directly from, Kepler's laws?
A) The orbit of each planet about the Sun is an ellipse with the Sun at one focus.
B) As a planet moves around its orbit, it sweeps out equal areas in equal times.
C) The force of attraction between any two objects decreases with the square of the distance between their centers.
D) A planet travels faster when it is nearer to the Sun and slower when it is farther from the Sun.
E) More distant planets move at slower speeds.
C
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Scale the Milky Way down to the size of a compact disc. Which of the following best describes the size, shape, and distance of the Andromeda Galaxy on the same scale?
A) a compact disk a few meters away B) a pecan nut about 1 centimeter away C) a grapefruit about 1 kilometer away D) a grapefruit a few meters away E) a compact disk about the length of a football field away
The first law of thermodynamics is based
upon a) the law of conservation of energy. b) the law of conservation of inertia. c) the law of conservation of molecular velocity. d) the ideal gas laws. •
Using your results from Problem 4.8, find the heat flow at the base of the fin for the following conditions:
Use a grid spacing of 0.5 cm.
GIVEN
A fin with variable cross-sectional area and perimeter
FIND
(a) Heat flow rate for conditions given above
If two children sit on a seesaw and one is twice as heavy as the other, in order to achieve balance the lighter child must sit
A. half as far from the fulcrum B. twice as far from the fulcrum C. the same distance from the fulcrum D. four times as far from the fulcrum