Free Fall: Ball A is dropped from the top of a building. One second later, ball B is dropped from the same building. Neglect air resistance. As time progresses, the difference in their speeds
A. increases.
B. remains constant.
C. decreases.
D. cannot be determined from the information given.
Answer: B
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Which of the following statements correctly compares the terrestrial planets?
A. Earth is the only planet that has active plate tectonics and surface water. B. Venus has the densest atmosphere and the highest average temperature. C. Mercury is the planet with the thinnest atmosphere and the smallest size. D. All of these choices are correct.
What two physical processes balance each other to create the condition known as gravitational equilibrium in stars?
A) gravitational force and outward pressure B) gravitational force and surface tension C) the strong force and the electromagnetic force D) the strong force and the weak force
The charge per unit length on an insulator is 6.2 ?C/m. On a 2.0-m length of this material, what is the difference in the number of electrons and the number of protons?
a. There are 7.8 × 10^13 more electrons than protons. b. There are 7.8 × 10^13 more protons than electrons. c. There are 3.9 × 10^13 more protons than electrons. d. There are 3.9 × 10^13 more electrons than protons.
When you look at a single slit diffraction pattern produced on a screen by light of a single wavelength, you see a bright central maximum and a number of maxima on either side, their intensity decreasing with distance from the central maximum. If the width of the slit is increased,
a. the pattern shrinks in size. (central maximum less wide; other maxima in closer to it) b. the pattern increases in size. (central maximum wider; other maxima farther from it) c. it does not affect the size of the pattern. d. the width of the central maximum increases, but the other maxima do not change in position or width. e. the width of the central maximum decreases, but the other maxima do not change in position or width.