Gold has a melting temperature of 1063?C and a latent heat of fusion of 12,700 J/mole.
(a) The absolute temperature is 1336 K. The latent heat of fusion is removed from the gold when it solidifies; it is therefore negative. The entropy change is given by the equation:
(b) The entropy change is negative. A negative entropy change corresponds to an increase in order in the change from a liquid to a crystalline solid.
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The position of an object as a function of time is given by x = - ct, where b = 2.0 m/ and and x and t are in SI units. What is the instantaneous velocity of the object when
A) 1.7 m/s B) 2.1 m/s C) 2.3 m/s D) 2.7 m/s
A. The divergence is positive. B. The divergence is negative. C. The divergence is zero.
The world's largest refracting telescope is operated at the Yerkes Observatory in Wisconsin. It has an objective of diameter of 1.02 m
Suppose such an instrument could be mounted on a spy satellite at an elevation of 300. km above the surface of the Earth. What is the minimum separation of two objects on the ground if their images are to be clearly resolved by this lens? (Assume an average wavelength of 0.55 ?m for white light.)
Why do we use fuses?
a. to eliminate shock hazards b. to prevent fires c. to save on the cost of electricity d. to store charge