The specific heat of ice is 2.100 kJ/kg 
the heat of fusion for ice at 0
is 333.7 kJ/kg, the specific heat of water 4.186 kJ/kg 
and the heat of vaporization of water at 100.0
is 2,256 kJ/kg. What is the final equilibrium temperature when 10.00 grams of ice at -15 
is mixed with 3.000 grams of steam at 100
?
A. 87.21
B. 85.32
C. 82.56
D. 80.12
E. 78.45
C. 82.56
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Light precedes through three polarizing sheets. Unpolarized light enters the 1st sheet and the resultant vertically polarized beam continues through the 2nd and 3rd
The 2nd sheet has its transmission axis at 50.° with respect to the 1st, and the 3rd is at 70.° with respect to the 1st. (a) What percent of the original intensity emerges from filter #1? (b) What percent of the original intensity emerges from filter #2? (c) What percent of the original intensity emerges from filter #3? (d) If filter #2 has its transmission axis changed to 30.°, what % intensity now emerges from the 3rd filter?
In the general theory of relativity, a gravitational field:
a. does NOT have any effect on how time passes. b. does NOT have any effect on space. c. makes clocks run faster. d. can be replaced by warped spacetime. e. is locally equivalent to being at rest in an inertial reference system.
Photoelectric Effect Using Stopping Potential: For a certain metal, light of frequency 7.24 × 10-14 Hz is just barely able to dislodge photoelectrons from the metal. (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J, e = 1.60 × 10-19 C)(a) What will be the stopping potential if light of frequency 8.75 × 10-14 Hz is shone on the metal?(b) What is the work function (in electron-volts) of this metal?
What will be an ideal response?
Two radioactive isotopes, X and Y, both decay to stable products. The half-life of X is about a day, while that of Y is about a week. Suppose a radioactive sample consists of a mixture of these two nuclides
If the mixture is such that the activities arising from X and Y are initially equal, then a few days later the activity of the sample will be due A) predominantly to Y. B) predominantly to X. C) entirely to Y. D) to X and Y equally.