The mass of a proton at rest is m. If the proton is moving so fast that its total energy is four times its rest energy, then what is the kinetic energy of the proton?
a. 3mc2
c. 2mc2
b. mc2
d. 4mc2
A
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The current in a wire varies with time according to the equation I(t) = 6.00 A + (4.80 A/s)t, where t is in seconds. How many coulombs of charge pass a cross section of the wire in the time period between t = 0.00 s and t = 3.00 s?
What will be an ideal response?
Which statement about this cluster is not true?
A) It contains some stars that are burning helium in their cores. B) It probably contains no young stars at all. C) It is likely to be located in the halo of the galaxy. D) It is likely to be spherical in shape. E) It is the type of cluster known as an open cluster of stars.
An aquarium contains a 5-cm layer of water (n = 1.333) floating on top of carbon tetrachloride (n = 1.461). If the angle of incidence into the water from the carbon tetrachloride is 20°, what is the angle of refraction into the air?
a. 20° b. 30° c. 38° d. 69° e. 26°
What evidence suggests that life arises relatively easily?
A) Life was present on Earth soon after the end of the heavy bombardment. B) Life is currently present in extreme environments like deep ocean volcanic vents. C) All organisms on Earth use DNA as their genetic material. D) Tardigrades, small animals, can survive exposure to the near-vacuum of space.