Gravitational Potential Energy: You do 116 J of work while pulling your sister back on a frictionless swing, whose chain is 5.10 m long, until the swing makes an angle of 32.0° with the vertical. What is your sister's mass?
A. 15.3 kg
B. 13.0 kg
C. 17.6 kg
D. 19.0 kg
Answer: A
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You are walking around on a solid surface; the surface gravity is comfortable, but it is "hot as hell." It feels as if your eyeballs are being squeezed, and your insides are queasy (due to the high pressure—almost like being deep in the ocean)
Your life-support belt is corroding. The Sun, barely visible through the haze, is near your meridian; you hope for nightfall (unaware that it would provide no substantial relief), but you already have been stuck on this planet for 72 hours, and the Sun seems not to have moved through the sky (and, if it moved at all, it moved eastward from the meridian).
Which of the following statements about the ecliptic plane is not true?
A) It is the plane of Earth's orbit around the Sun. B) It is the plane of the Moon's orbit around Earth. C) During a solar eclipse, the Moon lies in the ecliptic plane. D) During a lunar eclipse, the Moon lies in the ecliptic plane. E) The nodes of the Moon's orbit lie in the ecliptic plane.
A high-mass star dies more violently than a low-mass star because
A) it must always end up as a black hole. B) it generates more heat and its core eventually collapses very suddenly. C) it cannot fuse elements heavier than carbon. D) gravity is weakened by its high luminosity. E) it is most often found as part of a binary system.
Angular momentum has units of ______________
Fill in the blank(s) with correct word