The mean distance between the Earth and Sun is called
A) the astronomical unit.
B) the parsec.
C) the Kepler.
D) the megameter.
E) the light-year.
A
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Which of the following is a common characteristic of the Jovian planets?
A. thick atmosphere B. mostly composed of hydrogen and helium C. lack of solid surface D. ring systems and satellites E. All of these choices are correct.
According to the Big Bang theory, how many forces—and which ones—operated in the universe during the GUT era?
A) 1 force that represented the unification of all four forces that operate today B) 3 forces: gravity, the strong force, and the electroweak force C) 2 forces: the strong force and the electroweak force D) 2 forces: gravity and a single force that later became the strong, weak, and electromagnetic forces
A string is stretched and fixed at both ends, 200 cm apart. If the density of the string is 0.015 g/cm, and its tension is 600 N, what is the wavelength (in cm) of the first harmonic?
A. 600 B. 400 C. 800 D. 1000 E. 200
A car travels at a constant speed of 95.0 km/h around a circular track with a diameter of 1.00 km. What is the magnitude of the car's centripetal acceleration, and what supplies this?