In a nuclear reaction, what value is conserved in addition to electric charge, energy, and momentum?
A) atomic number
B) neutron number
C) nucleon number
D) all of the given answers
E) none of the given answers
C
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Polaris has always been the star nearest the north celestial pole
a. True b. False Indicate whether the statement is true or false
Part of a wreck from a ship weighs 500 N. It displaces 100 N of fluid. The buoyant force acting on it is
1) 100 N. 2) 250 N. 3) 500 N. From this we can see that the buoyant force is equal to the 4) weight of the submerged object. 5) volume of fluid displaced. 6) difference between the weight of the object and the weight of fluid. 7) weight of fluid displaced.
Absolute zero is the temperature of
A. frozen water B. the Universe C. liquid helium D. nothing
Mercury, the closest planet to the Sun, has an orbital period that is
1.greater than that of all of the other planets. 2.less than that of all of the other planets. 3.greater than that of some of the planets and less than that of others. 4.equal to one Earth year.