In our study of falling objects, we noted that the total distance fallen was approximately 5 m in 1 s, 20 m in 2 s, 45 m in 3 s, and 80 m in 4 s. Which of the following best describes the pattern in this data?
A) The path followed by the motion is parabolic.
B) The path followed by the motion is elliptical.
C) Distance is proportional to the time.
D) Distance is inversely proportional to the square of the time.
E) Distance is proportional to the square of the time.
E
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A thin 2.00-m string of mass 50.0 g is fixed at both ends and under a tension of 70.0 N. If it is set into small-amplitude oscillation, what is the frequency of the first harmonic mode?
A) 6.61 Hz B) 13.2 Hz C) 26.5 Hz D) 52.9 Hz
Why do elliptical galaxies appear yellow or red?
A) They contain no hot, young blue stars B) They contain only massive-stars that have progressed to the red-giant stage C) They have very little dust or cool gas, and thus have little ongoing star formation D) A and B E) A and C
If the frequency of the AC voltage across a capacitor is doubled, the capacitive reactance of that capacitor
A) decreases to one-fourth its original value. B) increases to 4 times its original value. C) decreases to one-half its original value. D) becomes zero. E) increases to twice its original value.
What are some advantages of radio telescopes over optical telescopes?
What will be an ideal response?