How does Newton's Universal Law of Gravitation explain Kepler's laws?
A) Universal gravitation implies that the orbits of the planets must be elliptical (Kepler's first law).
B) Universal gravitation implies that the planets will sweep out equal areas in equal times (Kepler's second law).
C) Universal gravitation implies that the planets further from the Sun will move more slowly than the planets closer to the Sun (Kepler's third law).
D) Universal gravitation implies that when a planet is closer to the Sun in its orbit, it will move faster than when it is farther from the Sun (Kepler's second law).
E) Both C and D are correct.
E
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First Law of Thermodynamics: An expansion process on an ideal diatomic ideal gas for which CV = 5/2 R has a linear path between the initial and final coordinates on a pV diagram. The coordinates of the initial state are: the pressure is 300 kPa, the volume is 0.030 m3, and the temperature is 390 K. The final pressure is 150 kPa and the final temperature is 340 K. What is the change in the internal (thermal) energy of the gas, during this process? (R = 8.31 J/mol ? K)
A. -2900 J B. -1700 J C. 2900 J D. 1700 J E. 0 J
What must be the diameter of a cylindrical 120-m long metal wire if its resistance is to be 6.0 ?? The resistivity of this metal is 1.68 × 10-8 ? ? m
A) 0.065 mm B) 0.65 mm C) 0.65 cm D) 0.325 mm E) 0.0325 mm
Supernovae are ____
a. very common: there are thousands of detectable events occurring in our galaxy each year b. common: a few dozen are detected in our galaxy each year c. uncommon: there are only one or two detected in our galaxy each year d. rare: only one or two occur each century in our galaxy e. extremely rare: only one or two are detected in the Universe each decade
A chunk of material from the interior of a white dwarf would weigh about 100 times more than an Earth rock of the same size.
Answer the following statement true (T) or false (F)