Who proposed the cylindrical model of earth?
What will be an ideal response?
anaximander
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A cylinder of weight W1 5 150 lb is supported at two points, 1 and 2, as shown. Neglect friction at the two points of contact. Normal forces N1 and N2 are (in lb):
(A) 75, 130
(B) 130, 75
(C) 125, 150
(D) 75, 120
In which of the following cases can we determine the precise mass and density of an extrasolar planet?
A) We have detected the planet with both the transit and Doppler methods. B) We have detected the planet with the Doppler method, but not any other method. C) We have detected the planet with the transit method, but not any other method. D) We have observed both transits and eclipses of the orbiting planet.
The biggest reason why heat engines are far from 100% efficient is
A) gravitational forces. B) the second law of thermodynamics. C) gremlins. D) the first law of thermodynamics. E) friction.
An ideal gas is allowed to expand adiabatically. Assume the process is reversible. The change in entropy is
a. 0 b. nR ln (V2/V1) c. nR ln (T2/T1) d. kn ln (V2/V1) e. kn ln (T2/T1)