Find the orbital speed of an ice cube in the rings of Saturn
The mass of Saturn is 5.68 × 1026 kg and the rings have an average radius of 100,000 km. (G = 6.67 × 10-11 N ? m2/kg2)
A) 27.5 km/s B) 13.8 km/s C) 1.95 km/s D) 19.5 km/s
D
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A series circuit contains an 80-?F capacitor, a 0.020-H inductor, and a switch. The resistance of the circuit is negligible
Initially, the switch is open, the capacitor voltage is 50 V, and the current in the inductor is zero. At time t = 0 s, the switch is closed. When the potential across the capacitor is 30 V, what is the rate of change of the current? A) 1000 A/s B) 1500 A/s C) 2000 A/s D) 2500 A/s E) 3000 A/s
The electric field just outside the surface of a hollow conducting sphere of radius 20 cm has a magnitude of 500 N/C and is directed outward. An unknown charge Q is introduced into the center of the sphere and it is noted that the electric field is still directed outward but has decreased to 100 N/C. What is the magnitude of the charge Q?
a. 1.5 nC b. 1.8 nC c. 1.3 nC d. 1.1 nC e. 2.7 nC
) Based on observations, which of the following statements about stars in the Milky Way is generally true?
A) the older the star, the lower its abundance of heavy elements B) the older the star, the bluer its color C) the older the star, the faster its orbital speed D) the younger the star, the higher its mass E) the less massive the star, the older it is
Which of the following is not a reason why telescopes tend to be built on mountaintops that are relatively far from cities and are in regions with dry climates?
A) The thin air on mountaintops makes the glass in telescope mirrors less susceptible to warping. B) Being on a high mountain top means being relatively high in the atmosphere, which tends to limit turbulence. C) Dry regions mean less rain and clouds, and mountaintops in dry regions may even allow some infrared observations. D) Mountaintops far from cities are generally subject to less light pollution than locations nearer to cities.