A snowball rolls down a hill gathering snow as it rolls and keeping perfectly spherical shape as it goes.   more »

A mixture of water and AgCl is shaken until a saturated solution forms. Then the solid is filtered, and 100 mL of 0.03 M NaBr. is added to 100 mL of the filtrate. Should a precipitate form?

Use the method of least squares to find a line that best fits the points (-1,-1) (0,0) and (2,1). Use this to estimate the value of y when x = 1.

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An organism with chitinous appendages and Malpighian tubules most likely eliminates carbon dioxide through:

(a) spiracles

(b) tentacles

(c) antennae

(d) nepbridia

Write complete and balanced equatons for each of the following reactions:

(1) P₂O₅ + H₂O --->

(2) NaCl + AgNO₃ --->

(3) H₂SO₄ + NaOH (limited)

(4) FeCl₂ + AgNO₃ --->

There are four train lines between X and Y; and three train lines between Y and Z. Find the number of ways a person can travel:

(1) by train from X to Z by way of Y

(2) roundtrip by train from X to Z by way of Y

How many ways can the roundtrip by train be taken from X to Z by way of Y, given that you do not use the same train line more than once?

Sketch and name all the possible linkage and stereoisomers of the following coordination compunds:

(a) [Pt(NH₃)₂(SCN)₂]

(b) [Co(en)(H₂NCH₂CO₂)₂]CI

If yesterday was Wednesday's tomorrow and tomorrow is Sunday's yesterday, what day would today be?

Compute the derivative of the following equation:

f(x) = x³(2x+4)²

Describe the set of all complex numbers y which satisfy the following condition:

0 < |y - 1| < 1 + |y|

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A cardplayer is dealt a poker hand (five cards) from an ordinary playing deck with the standard 52 cards. Find the number x of ways the player could be dealt a diamond flush (five diamonds).

Find the prime implicants of E=abc + a'c' +abc' +a'b'c +a'bc'

If seven people meet each other and each shakes hands only once with each of the other, how many handshakes will have taken place?

Let x^1/2+y^1/2=a^1/2. Find y' using implicit differentiation.

Which of the capital letters are topologically the same, and which are topologically different?

How many variations, topologically, are the in the alphabet?

Remember flex and bend all you want, but no tearing or gluing...

A net force of 10 newtons accelerates an object at 5.0 meters per second². What net force would be required to accelerate the same object at 1.0 meter per second²?

(1) 1N
(2) 2N
(3) 5N
(4) 50N

The Beatles have a concert that starts in 17 minutes and they must all cross a bridge to get there. All four men begin on the same side of the bridge. It is nightfall, and there is only one flashlight. A maximum of two people can cross at one time. Any party who crosses, either 1 or 2 people, must have the flashlight with them, and the flashlight must be walked back and forth. Each band member walks at a different speed. A pair must walk together at the rate of the slower man's pace:

*Ringo: - 1 minute crossing
*George: - 2 minutes crossing
*Paul:- 5 minutes crossing
*John: - 10 minutes crossing

Example: If Ringo and John go first, 10 minutes have elapsed when they get to the other side of the bridge. If John then returns with the flashlight, a total of 20 minutes have passed and they have missed the concert.

There are two known answers to this problem.

The amino acids in the amino acid sequences of the polypeptide chains of human proteins differ from those of chimpanzees by approximately what percentage?

(1) 1%
(2) 8%
(3) 20%
(4) 30%
(5) 45%

The heat of combustion for 1m of carbon to carbon dioxide is -410 kJ. How many kJ of heat would escape from the combustion of 60.0 g of carbon?

(1) -65 kJ
(2) -1680 kJ
(3) -2050 kJ
(4) -135 kJ