Center of Mass: Three balls are moving along a straight line having the instantaneous positions shown in the figure. At that instant, find the location and velocity of the center of mass (or center of gravity) of this system.
What will be an ideal response?
7.00 m to the right of the 2.00 kg ball, 1.11 m/s to the right
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For a specific element, photons of how many different energies could be emitted by electrons in the n = 3 level as they return to the n = 1 level?
a. 1 b. 4 c. 2 d. 3
Which of the following characterize(s) a wave?
a. Wavelength b. Amplitude c. Period d. All of these
Consider a child who is swinging. As she reaches the lowest point in her swing:
a. the tension in the rope is equal to her weight. b. the tension in the rope is equal to her mass times her acceleration. c. her acceleration is downward at 9.8 m/s2. d. none of the above.
What are the seasons like on a planet whose rotation axis is NOT tilted with respect to its orbital plane?
A) shorter than those on Earth. B) longer than those on Earth. C) the same as those on Earth. D) Reversed from those on Earth (winter, fall, summer, spring). E) there are no seasons.