Which is denser?
A. the Sun, which is about 300,000 times more massive than Earth
B. Earth (a solid object)
Answer: B
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A box of graham crackers is labeled "120 Calories per serving." Assuming this means 120 kcal, and recalling that 4.16 J = 1 cal, the energy of a serving of the graham crackers is about
A. 5 × 104 J. B. 5 × 105 J. C. 4.2 × 103 J. D. 120 J.
Two uncharged metal spheres, L and M, are in contact. A negatively charged rod is brought close to L, but not touching it, as shown. The two spheres are slightly separated and the rod is then withdrawn. As a result:
A. both spheres are neutral B. both spheres are positive C. both spheres are negative D. L is negative and M is positive E. L is positive and M is negative
The velocity of propagation of a transverse wave on a 2.0 m long string fixed at both ends is 200. m/s. Which one of the following is not a resonant frequency of this string?
A) 50 Hz B) 200 Hz C) 25 Hz D) 100 Hz
How thick are Saturn's rings from top to bottom?
A) a few million kilometers B) a few tens of thousands of kilometers C) a few hundred kilometers D) a few kilometers E) a few tens of meters