If you launch two probes in opposite directions from the Space Station, they will meet as they orbit Earth. According to general relativity, why does this happen?
A) They are following the straightest possible paths through space time, but those paths happen to meet.
B) They are following the allowed orbits according to Newton's universal law of gravitation.
C) The force of gravity tugs on the probes and forces them to orbit Earth.
D) Objects launched in space always follow circular paths, no matter where they are.
A
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In nuclear fusion, energy is produced because:
a) Hydrogen is not stable. b) the mass of the reacting chemicals is larger than that of the products. c) of the energetic impact of collisions. d) gravity leads to collapse. e) positrons are produced.
A uniform sphere of radius R and mass M rotates freely about a horizontal axis that is tangent to an equatorial plane of the sphere, as shown below. The rotational inertia of the sphere about this axis is
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.Which of the following transitions in hydrogen from an initial state (ni) to a final state (nf) results in the most energy emitted?
a. ni = 80, nf = 2 b. ni = 3, nf = 95 c. ni = 2, nf = 1 d. ni = 1, nf = 3
Which organic compound is represented by a pentagon?
a. Benzene b. Cyclopentane c. Cyclopropane d. Cyclobutane e. Methane