Kepler's second law, which states that as a planet moves around its orbit it sweeps out equal areas in equal times, means that
a)planets have circular orbits
b)planets period does not depend on the eccentricity of its orbit
c)a planet travels faster when it is nearer to the Sun and slower when it is farther from the Sun
c)a planet travels faster when it is nearer to the Sun and slower when it is farther from the Sun
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Thermal Expansion: A solid object has a volume density ?0 at a temperature of 315 K. The coefficient of volume expansion for the material of which it is made is 7.00 × 10-5 K-1. What will be its density (in terms of ?0 at a temperature of 425 K, assuming that it does not melt and that its thermal properties do not change with temperature?
Fill in the blank(s) with the appropriate word(s).
The Hubble Space Telescope is the largest telescope ever built.
Answer the following statement true (T) or false (F)
At what distance from the central axis of a long straight thin wire carrying a current of 5.0 A is the magnitude of the magnetic field due to the wire equal to the strength of
the Earth's magnetic field of about 5.0 × 10-5 T? (?0 = 4? × 10-7 T • m/A) A) 1.0 cm B) 2.0 cm C) 3.0 cm D) 4.0 cm E) 5.0 cm
The Emergency Core Cooling System is used in the event of an accident to ________
a. stop the fission reactions b. reduce fuel rod temperatures c. provide backup power to control rods d. change the decay heat of the fuel pellets