Objects in the Kuiper belt
A) are in random orbits at all inclinations to the ecliptic.
B) are the sources of long-period comets.
C) lie beyond the orbit of Neptune, and close to the ecliptic.
D) are dense, like the iron meteorites.
E) lie beyond the orbit of Neptune and perpendicular to the ecliptic.
C
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Phase Angles: A 120-V rms voltage at 60 Hz is applied across an RC circuit. The rms value of the current in the circuit is 0.60 A, and it leads the voltage by 60°. What is the capacitance in this circuit?
A. 13 ?F B. 14 ?F C. 15 ?F D. 16 ?F E. 17 ?F
Which large jovian moon is thought to have been captured into its present orbit?
A) Callisto B) Titan C) Triton D) Io
The percentage (by number of atoms) of the Sun that is hydrogen is about
A) 91%. B) 71%. C) 27%. D) 9%. E) less than 1%.
A solar heated house loses about 5.5 × 10^7 cal through its outer surfaces on a typical 24-h winter day. What mass of storage rock is needed to provide this amount of heat if it is brought up to initial temperature of 58°C by the solar collectors and the house is maintained at 23°C? (Specific heat of rock is 0.21 cal/g/°C.)
a. 1.4E+3 kg b. 7.5E+4 kg c. 7.5E+3 kg d. 7.5E+2 kg e. 1.6E+3 kg