A woman who normally weighs 400 N stands on top of a very tall ladder so she is one Earth-radius above Earth's surface. What is her weight there?
A) zero
B) 100 N
C) 200 N
D) 400 N
E) none of the above
Answer: B
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What are the two basic requirements for life to exist?
a. heat and light b. carbon and water c. oxygen and carbon d. light and carbon e. light and water
A typical meteor is created by a particle about the size of a
A) pea. B) baseball. C) car. D) basketball.
Which of the following best explains the hypothesized phenomenon of black hole evaporation?
A) Particles (or anti-particles) are created by a quantum mechanical effect near, but outside, the event horizon of the black hole. The law of conservation of energy maintains that the black hole must lose energy to "pay" for the creation of this mass. B) Particles (or anti-particles) are occasionally ejected from within the event horizon, causing the black hole to lose mass. C) Virtual particles created near the black hole are constantly annihilating each other, causing a high temperature even if the black hole has no accretion disk. This high temperature provides escape velocity for the virtual particles, causing the entire "cloud" of virtual particles to expand away into space. D) Black hole evaporation is a virtual process, meaning that it has been theorized by astrophysicists, but doesn't really occur.
Say you are in the bottom of Happy Valley. How does the force ofgravity compare towhat it would be on top of Mount Nittany?
a) two times less in Happy Valley than on Mount Nittany b) two times greater in Happy Valley than on Mount Nittany c) slightly greater in Happy Valley than on Mount Nittany d) exactly equal in Happy Valley and on Mount Nittany e) slightly less in Happy Valley than on Mount Nittany