When an object experiences uniform circular motion, the direction of the acceleration is
A) in the same direction as the velocity vector.
B) in the opposite direction of the velocity vector.
C) is directed toward the center of the circular path.
D) is directed away from the center of the circular path.
E) depends on the speed of the object.
C
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If a nucleus decays by ?+ decay to a daughter nucleus, which of the following statements about this decay are correct? (There may be more than one correct choice.)
A) The daughter nucleus has more protons than the original nucleus. B) The daughter nucleus has more neutrons than the original nucleus. C) The daughter nucleus has the same number of nucleons as the original nucleus. D) The daughter nucleus has fewer protons than the original nucleus. E) The daughter nucleus has fewer neutrons than the original nucleus.
What is main-sequence fitting?
A) a way of forcing stars to fit into a standard main sequence, even when they have some unusual characteristics B) a method for determining the age of a star cluster C) a method for determining the distance to a star cluster by assuming that its main sequence should line up with the main sequence on a standard H-R diagram D) the way we construct an H-R diagram by plotting the surface temperatures and luminosities of stars
The sky is the deepest blue
A) just before a rainstorm. B) during a rainstorm. C) just after a rainstorm. D) when the air is humid. E) just before sunset.
Assume the Heisenberg uncertainty principle can take the form ?E?t ? h/4B. How accurate can the position of an electron be made if its speed is 5 × 10^6 m/s and if the uncertainty in its energy is 10 eV?
a. 7.7 × 10^?18 m b. 1.3 × 10^?23 m c. 6.2 × 10^?15 m d. 1.6 × 10^?10 m e. 1.2 × 10^?9 m