Mary is 3.00 meters from the center of a merry-go-round. Her tangential speed is 1.88 m/s
(a) What is her angular speed in rad/s?
(b) What is her acceleration while her speed remains 1.88 m/s?
(a) 0.627 radians/s
(b) 1.18 m/s2
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Which of the following is true of ancient astronomers?
A) They believed that each star could be part of only one constellation. B) They believed that the sky was a great sphere surrounding Earth. C) They believed that Earth revolved around the Sun. D) They believed that stars were scattered through space at different distances.
A hydraulic lift has a small piston with a diameter 5.0 cm piston and the large piston with a diameter of 25 cm. What force must be applied on the small piston in order to lift a car on the large piston that weighs 13,000 N?
A. 520 N B. 5200 N C. 260 N D. 2600 N
Based on the curves shown here, which of the following statements best describes how we can distinguish a massive star supernova from a white dwarf supernova?
A) A white dwarf supernova is brighter at its peak and over a few months fades more steadily than a massive star supernova. B) For a few seconds, a white dwarf supernova is brighter than a massive star supernova, but after that the two look virtually identical. C) The spectrum of a massive star supernova has two major spectral lines, while a white dwarf supernova has only one. D) The two types of supernovae behave so similarly that we can only distinguish them by studying photographs of the systems taken before the explosions.
The change in entropy of a mass m of a solid substance which has a latent heat of fusion LF and melts at a temperature T is
A. LFT/m B. mLFln(T) C. mLFT D. mLF/T E. LF/mT