Discuss the ring particles orbiting Jupiter, Saturn, Uranus, and Neptune
What will be an ideal response?
Jupiter's rings are dark and reddish, and mostly microscopic, made up of rocky material. Saturn's rings are made up of billions of ice particles. Uranus's rings are dark and contain little dust. Neptune's rings are similar to those of Uranus but contain more small dust particles.
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The planets in the solar system
A) revolve around the Sun in the same direction B) orbit around the Sun in nearly the same plane C) have nearly circular orbits D) all of these are true
Why can we not measure the mass of elliptical galaxies using the 21-cm line of hydrogen gas?
A) All elliptical galaxies are too far away for us to detect the 21-cm line. B) Supermassive black holes in the center of elliptical galaxies disturb measurements of the 21-cm line. C) The disorderly motion of the material in elliptical galaxies prevents us from measuring different velocities at different sides of the galaxy. D) Elliptical galaxies have little gas, so do not have strong 21-cm line emission.
A mass is bouncing on the end of a spring with a period T when measured by a ground observer. What would the period of oscillation be (as measured by the same observer) if the mass and spring were moving past the ground observer at a speed of 0.600c?
a. 0.440 T b. 1.25 T c. 0.600 T d. 1.67 T
A wire has a cross-sectional area of 0.10 mm2. If there are 4.0 × 1028 atoms per cubic meter in this wire, and if each atom contributes 2 free electrons,
what is the drift velocity of the electrons when the current in the wire is 6.0 A? (e = 1.60 × 10-19 C) A) 0.0047 m/s B) 0.94 m/s C) 0.019 m/s D) 0.0092 m/s