A nuclear reaction is said to be exothermic if the total kinetic energy is
A)
less after the reaction than before.
B)
equal both before and after the reaction.
C)
greater after the reaction than before.
D)
zero after the reaction.
C
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The Earth is 93.0 million miles from the Sun and its period of revolution is 1 year = 3.15 × 10^7 s. What is the acceleration of the Earth in its orbit about the Sun?
a. 18.6 mi/s2 b. 9.30 × 10^?3 mi/s2 c. 13.6 × 10^?6 mi/s2 d. 3.70 × 10^?6 mi/s2
What principle is responsible for the fact that certain sunglasses can reduce glare from reflected surfaces?
A) refraction B) reflection C) polarization D) diffraction E) total internal reflection
The number of protons in a neutral atom is
A) called the mass number. B) zero. C) the same for all elements. D) equal to the number of electrons. E) equal to the number of neutrons.
The point in Earth's orbit where Earth is farthest from the sun is known as
a. aphelion. b. perihelion. c. precession. d. the winter solstice e. a and d