Current observations indicate that the amount of baryonic matter and dark matter in the Universe
a. is sufficient great enough to overcome the expansion of the Universe.
b. implies that the Universe is closed.
c. is mostly in the form of black holes and quasars.
d. are roughly equal.
e. implies that the Universe is open.
e
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The potential energy of a spring of constant k that has been stretched a distance x is given by
A. (½)kx. B. kx2. C. (½)kx2. D. (½)k/x. E. kx.
A parallel-plate capacitor is filled with a dielectric with K = 4. The plate area is 3 m2 and the plate separation is 2 mm. The capacitance of this capacitor is
A) 8 nF. B) 210 nF. C) 18 nF. D) 53 nF. E) 13 nF.
One unusual aspect of dark matter is
A) it exerts no gravitational force. B) it moves faster than lightspeed. C) it exerts a new kind of fundamental force, never observed before. D) it does not interact with electromagnetic radiation. E) its gravitational force pushes (or repels) instead of pulling.
Determine the heat capacity (in calories/°C) of a lake containing one million gallons (approximately 4 million kilograms) of water at 15°C
a. 4 × 10^6 b. 4 × 10^9 c. 4 × 10^3 d. 1 × 10^3 e. 4 × 10^2