Kepler was finally able to absolutely prove the truth of his theory of the motion of the planets by using
A) the data of Tycho Brahe.
B) his own highly accurate observations of the planets.
C) data gathered by the ancient Greeks.
D) All of the above.
E) Nonsense--it is impossible to prove that a theory is true.
E
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____________________ are great lava flows covering 17% of the lunar surface
Fill in the blank(s) with correct word
What happens when a solar nebula contracts?
A) It flattens out. B) It spins faster. C) It heats up. D) All of the above E) None of the above
A 4.0-pC point charge is placed at the center of a hollow (inner radius = 2.0 cm, outer radius = 4.0 cm) conducting sphere which has a net charge of 4.0 pC. Determine the magnitude of the electric field at a point which is 6.0 cm from the point charge
a. 35 N/C b. 25 N/C c. 30 N/C d. 20 N/C e. 10 N/C
Ethyl alcohol bubbles form at 78.50C, 101 kPa. Assuming that the surface tension is 75 mN/m and the density of vapor ethyl alcohol is 0.8 kg/m^3 with a vapor pressure of 102 kPa, estimate the buoyant force acting on the bubbles.
What will be an ideal response?