A ball naturally floats with 35% of its volume above the surface of a pool filled with mercury (density 13600
If a force of 1200 N is required to force the ball completely under water, what is the radius of the ball?
A. 5.7 cm
B. 31.9 cm
C. 14.9 cm
D. 12.9 cm
C. 14.9 cm
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One of the harmonics of a column of air in a tube that is open at one end and closed at the other has a frequency of 448 Hz, and the next higher harmonic has a frequency of 576 Hz. What is the fundamental frequency of the air column in this tube?
A) 32 Hz B) 64 Hz C) 88 Hz D) 128 Hz E) 256 Hz
A hunter wishes to cross a river that is 1.5 km wide and flows with a velocity of 5.0 km/h parallel to its banks. The hunter uses a small powerboat that moves at a maximum speed of 12 km/h with respect to the water. What is the minimum time for crossing?
How can a charged object attract an uncharged object made of non-conducting material?
a. The charges in the uncharged object can become polarized. b. The uncharged object must somehow gain a like charge. c. Attraction of an insulator is not possible. d. The uncharged object must somehow gain an unlike charge.
Initially proposed Hubble’s Law
A. Gerard de Vaucouleurs |
B. Georges Lemaître |
C. Hubble’s Law |
D. Edwin Hubble |
E. Velocity or Speed |
F. Ho |