Ten kilograms of water at 0°C is mixed with 10 kg of water at 100°C. The change in entropy (in cal/K) of the system is
a. 1 000
b. 480
c. -720
d. 240
e. -168
D
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Which mechanism does it least effectively suppress?
A. Conduction B. Convection C. Radiation
When we see X-rays from an accretion disk in a binary system, we can't immediately tell whether the accretion disk surrounds a neutron star or a black hole. Suppose we then observe each of the following phenomena in this system
Which one would force us to immediately rule out the possibility of a black hole? A) bright X-ray emission that varies on a time scale of a few hours B) spectral lines from the companion star that alternately shift to shorter and longer wavelengths C) sudden, intense X-ray bursts D) visible and ultraviolet light from the companion star
A child has a temperature of 104°F. What is the temperature in degrees kelvin?
a. 40 b. 406 c. 401 d. 313 e. 349
Daylight hours and night hours are equal in duration throughout the year at the ______________
Fill in the blank(s) with correct word