What is the mass of 25 cm3 of pure water?
a. None of these
b. 25 kg
c. 25 g
d. 25 mL
c
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A 20-kg object is resting at the top of a table 1.3 m above ground level. The object is then picked up and moved to a height of 7.7 m above ground level. What is the change in the gravitational potential energy of this object?
A particle with charge Q is on the y axis a distance a from the origin and a particle with charge q is on the x axis a distance d from the origin. The value of d for which the x component of the force on the second particle is the greatest is:
A) 0 B) a C) sqrt(2a) D) a/2 E) a/sqrt(2)
What is the moderator of a nuclear reactor?
a. The control rods that halt a chain reaction if it is out of control. b. A substance that absorbs neutrons to keep the reaction in control. c. The material that slows down the neutrons to induce more chain reactions. d. The material that speeds up the neutrons to induce more chain reactions. e. The name for the fissionable material itself (usually uranium).
Helium fusion within a star begins
A) after all the hydrogen within the star has been depleted. B) when all carbon has been depleted. C) because of the force of gravity. D) with the expulsion of practically all hydrogen.