A 6.0-?F capacitor charged to 50 V and a 4.0-?F capacitor charged to 34 V are connected to each other, with the two positive plates connected and the two negative plates connected. What is the total energy stored in the 6.0-?F capacitor at equilibrium?
a. 6.1 mJ
b. 5.7 mJ
c. 6.6 mJ
d. 7.0 mJ
e. 3.8 mJ
b
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A mass-to-light ratio for a galaxy of much greater than one indicates that
A) on average, each solar mass of matter in the galaxy emits much more light than our Sun. B) on average, each solar mass of matter in the galaxy emits much less light than our Sun. C) most stars in the galaxy are more massive than our Sun. D) the galaxy is very massive. E) the galaxy is not very massive.
Which best describes the appearance of an asteroid?
a. spherical in shape and covered with craters b. spherical in shape with a volcanic surface c. irregular in shape and covered with craters d. irregular in shape with a volcanic surface e. spherical in shape and smooth, dusty surface
Carbon-15 and nitrogen-15 are isotopes of the same element
What will be an ideal response?
Energy balance in the Sun refers to a balance between
A) the rate at which fusion generates energy in the Sun's core and the rate at which the Sun's surface radiates energy into space. B) the mass that the Sun loses each second and the amount of mass converted into energy each second. C) the force of gravity pulling inward and the force due to pressure pushing outward. D) the amount of energy the Sun radiates into space and the amount of energy that reaches Earth.