Stars nearby to our sun have an average relative speed of about 70,000 km/hour. How fast is that in km/s?
A) about 3000 km/s B) about 20 km/s
C) about 1200 km/s D) about 4.2 million km/s
B
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Because of refraction, a person standing waist deep in a swimming pool appears to have
A) shorter legs. B) longer legs. C) thinner legs. D) none of the above
Sound: What characteristics of a sound wave are related to the "pitch" of a musical note? (There could be more than one correct choice.)
A. amplitude B. wavelength C. frequency D. period
A rifle is aimed horizontally at the center of a large target 60 m away. The initial speed of the bullet is 240 m/s. What is the distance from the center of the target to the point where the bullet strikes the target?
A. 48 cm B. 17 cm C. 31 cm D. 69 cm E. 52 cm
According to Lenz’s Law the direction of the induced current produced by a changing magnetic flux is such as to produce a magnetic field that
A. reinforces the change in the original magnetic flux. B. opposes the change in the original magnetic flux.