A 100 g glass container contains 250 g of water at 
A 100 g piece of unknown material at 
is added to the water in the container. The final temperature of the mixture is 
What is the specific heat of the unknown material in 
(specific heat of water 
specific heat of glass
A. 245
B. 387
C. 412
D. 558
E. 674
D. 558
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A cold trap is set up to cause molecules to linger near the suction in a vacuum system. If the cold trap has an effective volume of 0.200 L and is maintained at how many molecules are in it at 10.0 Pa of pressure?
(Avogadro's number is 6.022 × 1023 molecules/mol, and the universal gas constant is 8.314 J/mol ? K. Assume the behavior of an ideal gas.) A) 1.11 × 1019 molecules B) 1.10 × 1022 molecules C) 7.71 × 1020 molecules D) 7.71 × 1023 molecules
Suppose you look by eye at a star near the edge of a dusty interstellar cloud. The star will look ________ than it would if it were outside the cloud
A) dimmer and bluer B) more redshifted C) brighter and redder D) dimmer and redder
the electromagnetic force on the proton 
A. The vector points in the +x direction. B. The vector points in the -x direction. C. The vector points in the +y direction. D. The vector points in the -y direction. E. The vector points in the +z direction. F. The vector points in the -z direction. T. The vector is zero.
A converging lens will be prescribed by the eye doctor to correct which of the following?
a. farsightedness b. glaucoma c. nearsightedness d. astigmatism