If the Q-value is less than zero for a nuclear reaction, the reaction is
A)
exoergic.
B)
endoergic.
C)
endothermic.
D)
exdoergic.
E)
not possible.
B
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The Saros cycle
a. was used in ancient times to predict eclipses. b. is 18 years, 11 days long. c. accounts for the tides seen on Earth. d. was used in ancient times to predict eclipses and is 18 years and 11 days long, e. None of the other choices are correct.
Given that the charge on an up quark is +2/3 and the charge on a down quark is ?1/3, which combination represents a neutron?
A. uud B. udd C. uuu D. ddd
In order to quadruple an object's kinetic energy, we must
A) double its speed. B) double its height C) stretch it twice as far. D) quadruple its height. E) quadruple its speed.
Besides Earth, which of the terrestrial planets and/or satellites of terrestrial planets show(s) evidence for the possible existence of liquid water flowing on its surface in the past?
a. Venus b. the Moon c. Phobos d. Mars e. None of the terrestrial planets or satellites show such evidence.