A heat engine that in each cycle does positive work and loses energy as heat, with no heat energy input, would violate:
A. the zeroth law of thermodynamics
B. the first law of thermodynamics
C. the second law of thermodynamics
D. the third law of thermodynamics
E. Newton's second law
Answer: B. the first law of thermodynamics
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Gravitational Force: What is the distance from the center of the Moon to the point between Earth and the Moon where the gravitational pulls of Earth and Moon are equal? The mass of Earth is 5.97 × 1024 kg, the mass of the Moon is 7.35 × 1022 kg, the center-to-center distance between Earth and the Moon is 3.84 × 108 m, and G = 6.67 × 10-11 N ? m2/kg2.
A. 3.45 × 108 m B. 3.84 × 107 m C. 4.69 × 106 m D. 3.83 × 106 m E. 4.69 × 107 m
In Problem 2.7, the perpendicular distance d (in.) from force F to line AC is:
(A) 1.7 (B) 2.1 (C) 1.2 (D) 3.3
Asteroid 2004 FH passed within a tenth of the Earth-Moon distance in March 2004. When its period was found to be about nine months, it was classified as a(n):
A) short period comet. B) aten asteroid. C) apollo asteroid. D) amor asteroid. E) Kuiper Belt Object.
What do we mean by the star-gas-star cycle?
A) It is the idea that stars in close binary systems can exchange gas with one another. B) It is the set of nuclear reactions by which heavy elements are produced in the cores of massive stars. C) It describes the orbits of the stars and interstellar medium around the center of the galaxy. D) It is the continuous recycling of gas in the galactic disk between stars and the interstellar medium.