What nuclear fusion mechanism does an isolated white dwarf use to generate energy?
a. proton-proton chain
b. CNO cycle
c. triple alpha process
d. white dwarfs don't generate their own energy.
d
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An airplane flying horizontally with a speed of 500 km/h at a height of 800 m drops a crate of supplies (see the following figure). If the parachute fails to open, how far in front of the release point does the crate hit the ground?
In the context of the history of the Moon, the slow surface evolution of the Moon was limited because:
A) the Moon lacks air and water. B) the Moon has a very high escape velocity. C) of the heat released from infalling matter. D) of the late heavy bombardment.
How is radioactive dating used to determine the age of an object?
a. Both the amounts of radioactive and decay material are measured. Using these with the radioactive material's half-life, the age can be estimated. b. The amount of radioactive material is measured. Using this with the radioactive material's half-life, the age can be estimated. c. The amount of decay material is measured. Using this with the radioactive material's half-life, the age can be estimated. d. The amount of heat generated by radioactive dating is measured to determine age.
Two resistors with resistances of 5.0 ? and 9.0 ? are connected in parallel. A 4.0-? resistor is then connected in series with this parallel combination
An ideal 6.0-V battery is then connected across the series-parallel combination. What is the current through (a) the 4.0-? resistor and (b) the 5.0-? resistor?