Roughly what percentage of the mass-energy of in-falling matter can be converted to other forms of energy as the matter falls into a black hole?
A) 0.7%
B) 1-4%
C) 10-40%
D) 100%
C) 10-40%
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Given the distance x that a spring is compressed, what is the potential energy of the spring?
A. 2 kx^2 B. ½ kx C. ½ kx^2 D. 2 kx
An astronaut is in an all-metal chamber outside the space station when a solar storm results in the deposit of a large positive charge on the station. Which statement is correct?
a. The astronaut must abandon the chamber immediately to avoid being electrocuted. b. The astronaut will be safe only if she is wearing a spacesuit made of non-conducting materials. c. The astronaut does not need to worry: the charge will remain on the outside surface. d. The astronaut must abandon the chamber if the electric field on the outside surface becomes greater than the breakdown field of air. e. The astronaut must abandon the chamber immediately because the electric field inside the chamber is non-uniform.
Considering how small atoms are, what are the chances that at least one of the atoms exhaled in your first breath will be in your last breath?
A) Not very likely because atoms are constantly dematerializing. B) Not possible at all because atom don't last that long. C) Very probable because atoms are incredibly small. D) There's not really a way that scientists are able to make such an estimate.
One possible way that future scientists may determine whether the core-accretion model or the gravitational instability theory better explains the formation of the jovian planet is:
A) measuring the mass of the rocky material in the jovian planets' cores. B) measuring the metallic hydrogen layer in the jovian planets. C) observing the changes in the rings around the jovian planets. D) observing the changes in the magnetic fields of the jovian planets.