A 1.0-kg chunk of ice at 0°C melts, absorbing 80 000 cal of heat in the process. Which of the following best describes what happens to this system?
a. increased entropy
b. lost entropy
c. entropy maintained constant
d. work converted to energy
a
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An airplane flies in a semi-circular arc in order to simulate “weightlessness” for its occupants. If the speed at which the plane flies is 750 km/hr, what is the radius of the semicircular path it flies in?
A. 57 km B. 1.6 km C. 4.4 km D. 2.2 km E. 76 km
The coefficient of linear expansion of ordinary glass is three times that of Pyrex glass. An ordinary glass rod and a Pyrex glass rod of equal lengths at room temperature are dropped into boiling water. The change in length of the ordinary glass rod will be 3 times the change in length of the Pyrex glass rod
a. True b. False Indicate whether the statement is true or false
According to Einstein, as the wavelength of the incident monochromatic light beam becomes shorter, the work function of a target material in a phototube:
a. increases. b. is directly proportional to wavelength. c. decreases. d. remains constant.
Which of the following is the standard international unit for measuring energy?
A) Kelvin B) joule C) watt D) newton E) meter