100 grams of molten lead (600°C) is used to make musket balls. If the lead shot is allowed to cool to room temperature (21°C), what is the change in entropy (in J/K) of the lead? (For the specific heat of molten and solid lead use 1.29 J/g/°C; the latent heat of fusion and the melting point of lead are 2.45 × 10^4 J/kg and 327°C.)
a. ?145
b. ?252
c. ?302
d. ?429
e. ?100
a
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A disk is suspended by a nail such that the pivots in a vertical plane about a point on the edge of the disk. If the period of oscillation of the disk is 1.25 s, what is the disk’s radius?
A. 26 cm B. 78 cm C. Cannot answer without knowing the disk's mass D. 51 cm
Why was the globular cluster M13 selected as the target for the 1974 Arecibo message?
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In Jules Verne's From the Earth to the Moon, scientists are launched from the surface of Earth by a cannon
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What is the frequency, in hertz, of a sound wave (v = 340 m/s) with a wavelength of 68 m?
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