A vessel containing 10 kg of water is left out where it evaporates. If the temperature remains constant at 20°C, what is the change in entropy (in kcal/K)? (The latent heat of vaporization at 20°C is 585 cal/g.)
a. 30
b. 10
c. 20
d. 40
e. 290
C
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A positively charged insulating rod is brought close to an object that is suspended by a string. If the object is repelled away from the rod we can conclude:
A) the object is positively charged B) the object is negatively charged C) the object is an insulator D) the object is a conductor E) none of the above
Among these choices, which is the first thing that happens in thehistory of the universe?
a) formation of nuclei of helium b) binding of electrons to nuclei c) first stars form d) universe becomes transparent e) first supernova explosions occur
The celestial equator always crosses the horizon at the east point and west point
a. True b. False Indicate whether the statement is true or false
What would be the deBroglie wavelength for 1 gram moving at "escape speed" 25,000. mph?
What will be an ideal response?