A spaceship from another galaxy passes over the solar system directly above a radial line from the sun to the Earth. (We measure that distance to be 1.5 × 10^11 m.) On Earth, the spaceship is observed to be traveling at a speed of 0.80 c, for which ? = 5/3 . As measured on Earth it takes the spaceship 625 seconds to travel from the sun to Earth. When a scientist in the spaceship measures the
Earth-sun distance and the time it takes her to travel that distance, she finds the results are respectively
a. 9.0 × 10^10 m; 375 s.
b. 9.0 × 10^10 m; 625 s.
c. 1.5 × 10^11 m; 625 s.
d. 2.5 × 10^11 m; 625 s.
e. 2.5 × 10^11 m; 1042 s.
a
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The Jovian planets have low density because:
A) they formed in the outer solar nebula where water vapor could freeze to form ice particles. B) interactions between their magnetic fields and the solar wind generate powerful electric currents. C) the continuous blast of micrometeorites evaporates surface ice, leaving behind embedded minerals. D) the heat flowing out of them emits about twice as much less energy as they absorb from the Sun.
AC Generator: You are designing an ac generator with a maximum emf of 8.0 V. If the generator coil has 200 turns, each with a cross-sectional area of 0.030 m2, what should be the frequency of the generator in a magnetic field of 0.030 T?
A. 7.1 Hz B. 7.5 Hz C. 8.0 Hz D. 44 Hz
The figure above shows the geological time scale of Earth. The time since dinosaurs went extinct (with the K-T event) represents approximately ________ of the Earth's history.
A) 0.15% B) 1.5% C) 15% D) 50%
What four equations provide for the four unknowns u, v, w, p that are most often of interest in fluid mechanics?
(A) Continuity, momentum (B) Continuity, momentum, energy (C) Continuity, momentum, energy, equation of state (D) Continuity, momentum, energy, enthalpy relation