Why is Venus' rotation unusual?
What will be an ideal response?
Venus is the only terrestrial planet to rotate retrograde (or backwards or clockwise) on its axis.
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Add the following lengths, each obtained from a different measuring instrument, and round the answer to the proper number of significant figures: 20.02 m, 5.91 m, 0.0097 m, and 2.467 m
What will be an ideal response?
High-energy photons are used to bombard an unknown metal. The strongest peak is found for X-rays with an energy of 66 keV. What is the atomic number of the metal?
A) 80 B) 81 C) 82 D) 83 E) 84
A camera gives a correct exposure at f/4 with a shutter speed of 1/128 s. In order to increase the depth of field, the f-stop is changed to f/8. What shutter speed will now give a correct exposure if lighting conditions do not change?
1.1/512 s 2.1/256 s 3.1/32 s 4.1/16 s
The orbital motion of a wave is greatest (has the largest "diameter") at
A) the wave base. B) about one-half the depth of the wave base. C) a depth of one-half the wavelength. D) the surface.