When 14C goes through radioactive decay, one of its neutrons splits into a proton and an electron. What does 14C become?
a. 13C6
b. 14N7
c. 13N7
d. 13B5
e. 15C6
b
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At the center of the Sun, fusion converts hydrogen into
A) hydrogen compounds. B) plasma. C) radiation and elements like carbon and nitrogen. D) radioactive elements like uranium and plutonium. E) helium, energy, and neutrinos.
Two astronauts, with masses 60. and 80. kg, are initially at rest in outer space. They push each other apart. How far has the heavier astronaut moved when the lighter astronaut has moved 12. m?
A) 12. m B) 9.0 m C) 16. m D) 21. m E) 7.0 m
A quantity of an ideal gas is kept in a rigid container of constant volume. If the gas is originally at a temperature of 19°C,
at what temperature will the pressure of the gas double from its original value? A) 91°C B) 38°C C) 311°C D) 273°C E) 122°C
By how much is the energy stored in a Hooke's law spring increased when its stretch is increased from 7.00 cm to 15.00 cm?
a. 159% b. 259% c. 359% d. 459% e. The correct answer is not given.