When the nuclear reactions begin making too little energy in a star, by virtue of the natural thermostat, the star:
A) would expand slightly.
B) would reduce its central temperature.
C) would increase its density.
D) would increase the mass by a factor of 2.
C
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An atom with atomic number 3 is in its ground state. How many electrons are in its outermost shell?
What will be an ideal response?
Stalactites form from
A) a cave ceiling downward. B) a cave floor upward. C) calcium-rich water dripping down from the cave ceiling. D) the accumulation of calcium-rich water dripping on the cave floor.
A satellite is in orbit around a planet. The orbital radius is 34.0 km and the gravitational acceleration at that height is 2.3 m/s2. What is the satellite's orbital speed?
A) 280 m/s B) 8.8 m/s C) 28 m/s D) 88 m/s
Two capacitors with capacitances of 3.25 and 5.00 ?F, respectively, are connected in parallel. The system is connected to a 55-V battery. What charge accumulates on the 3.25-?F capacitor?
a. 16 ?C b. 180 ?C c. 0.30 ?C d. 3.4 ?C e. 1.5 ?C