The density of interstellar dust is very low, yet it still blocks starlight because:
A) it is so cold it absorbs higher energy photons.
B) there is 100 times more opaque gas than dust present in the ISM.
C) the dust particles are about the same size as the light waves they absorb.
D) the dust particles are irregular in shape.
E) ice particles reflect all light back toward their stars, not toward us.
C
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Which person’s watch or clocks register(s) a coordinate time between those events in some inertial frame?
A. Alice B. Bob C. Carol D. Alice and Bob E. Bob and Carol F. Alice and Carol T. All three observers
What do we mean when we say that particles such as neutrinos or WIMPs are weakly interacting?
A) They respond to the weak force but not to the electromagnetic force, which means they cannot emit light. B) The light that they emit is so weak that it is undetectable to our telescopes. C) They are only weakly bound by gravity, which means they can fly off and escape from galaxies quite easily. D) They interact with other matter only through the weak force and not through gravity or any other force.
A particle (charge = +40 ?C) is located on the x axis at the point x = ?20 cm, and a second particle (charge = ?50 ?C) is placed on the x axis at x = +30 cm. What is the magnitude of the total electrostatic force on a third particle (charge = ?4.0 ?C) placed at the origin (x = 0)?
a. 41 N b. 16 N c. 56 N d. 35 N e. 72 N
A type of chemical weathering caused by rainwater that has absorbed atmospheric carbon dioxide and formed a weak carbonic acid that slowly dissolves rock is
What will be an ideal response?