A child sits on a merry-go-round, 1.5 meters from the center. The merry-go-round is turning at a constant rate, and the child is observed to have a radial acceleration of 2.3 m/s2
How long does it take for the merry-go-round to make one revolution?
5.1 s
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The Ptolemaic model of the universe
A) explained and predicted the motions of the planets with deferents and epicycles. B) is the basis of our modern cosmology. C) could not account for the stellar parallax observed by Hipparchus. D) describes the orbits of the planets as being ellipses, not circles. E) always kept Mars and Mercury between the Earth and Sun.
In which of the following cases does TANSTAAFL apply?
a. common use of land for grazing of sheep b. use of air in industrial processes c. use of water for power plant cooling d. TANSTAAFL applies in all the above cases. e. TANSTAAFL does not apply in any of the above cases.
What are the third, fifth, and seventh planets in order of increasing distance from the Sun?
A. Venus, Earth, Jupiter B. Earth, Jupiter, Uranus C. Mars, Jupiter, Neptune D. Mercury, Mars, Saturn
A guitar string 0.650 m long has a tension of 61.0 N and a mass per unit length of 3.00 g/m. (a) What is the speed of waves on the string when it is plucked? (b) What is the string's fundamental frequency of vibration when plucked?
What will be an ideal response?