Orbital speed is the speed with which a planet moves around the Sun. This speed is determined by:
A) the mass of the planet only.
B) the mass of the Sun only.
C) both the mass of the planet and the mass of the Sun.
D) the mass of the planet and its distance from the Sun.
E) the mass of both the planet and the Sun and the distance between the two.
E
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At a depth of 1030 m in Lake Baikal (a fresh water lake in Siberia), the pressure has increased by 100 atmospheres (to about 107 N/m2)
By what volume has 1.0 m3 of water from the surface of the lake been compressed if it is forced down to this depth? The bulk modulus of water is 2.3 × 109 Pa. A) 5.3 × 10-3 m3 B) 4.3 × 10-3 m3 C) 2.3 × 10-3 m3 D) 3.3 × 10-3 m3
Superconductors lose their superconducting property above their ________ temperature.
Fill in the blank(s) with the appropriate word(s).
Imagine four equal positive charges, q, placed on points of a circle of radius r at the 3, 6, 9, and 12 o'clock positions. Coulomb's constant is k. The magnitude of the electric field at the center of the circle is given by
A. 4 kq/r. B. 4 kq/r2. C. kq/r2. D. kq/r. E. zero.
The size of a black hole, its Schwarzschild radius, is simply proportional to its _____
A) mass B) luminosity C) temperature D) density