Consider the ratio of the surface area of a sphere to its volume. What happens to this ratio if the diameter of the sphere increases by a factor of 3?
A. Decreases by a factor of 9
B. Increases by a factor of 3
C. Decreases by a factor of 3
D. Increases by a factor of 9
E. Stays the same
C. Decreases by a factor of 3
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As a star like the Sun exhausts hydrogen in its core, the outer layers of the star
a. become hotter and more luminous. b. become cooler and more luminous. c. become hotter and less luminous. d. become cooler and less luminous. e. become larger in radius and hotter.
Capacitors in Combination: A system of four capacitors is connected across a 90-V voltage source as shown in the figure.(a) What is the charge on the 4.0-µF capacitor?(b) What is the charge on the 2.0-µF capacitor?
What will be an ideal response?
About how high can water at sea level be theoretically lifted by a vacuum pump?
A) less than 10.3 m B) 10.3 m C) more than 10.3 m
What is the kinetic energy of an electron in the ground state of hydrogen?
A. 0.000 B. 13.6 eV C. 6.80 eV D. 27.2 eV E. 1.88 eV