2009-2010 Study List

[stupidityismygam]

It would probably be nifty we could keep all of the questions about the Study List Problems in this thread.

[sexyasiangirl]

08E-37 A hiker and a jogger start out together on a 5 mi long trail. The jogger runs a mi in 8 min 10 s, and the hiker travels at 2.5 mph. When the jogger got to the end of the trip, she turned around and ran back to the hiker. She then reversed direction again, heading back towards the end of the trail. This continued until the hiker finished the trail. How far did the jogger run?

Fast/easy way to do this? =/

[sexyasiangirl]

Also,

09E-38. Lenny starts with a full, 2-cup container of 30% salt solution. He divides the solution in half. To one half, he adds water to double the volume and refills the original container, discarding the leftover mixture. How many times must this procedure be done to dilute the original 30% solution down to just less than 5%?

[stupidityismygam]

[sexyasiangirl]

Oh thanks that makes sense.

How about the Lenny one? The way I'm interpreting it, I keep getting 2 (2.58), but the answer is 7?

[stupidityismygam]

[sexyasiangirl]

Oh okay I thought he was just throwing away the original cup 1 every time he halved it, then refilling it with the new cup 2.

[uglydawg360]

I have three questions that i couldnt solve from the study list. So I would appreciate it if someone would help.

05A-38 (modified). A pendulum has a period that is directly
proportional to its distance from the center of the earth
and also proportional to the square root of the pendulum
length. If a 24-inch pendulum has a 2 second period at sea
level, what would be the period of a 20-inch pendulum at
altitude of 1 mile? -------------------------------------------


A 4.5 ft cord is sectioned into three pieces to form
a right triangle. If the hypotenuse is 2.1 ft, what is the
ratio of the lengths of the other two pieces, a number
greater than 1?


Ten tablespoons of dye are added to a gallon of
water to make dyestock. How much dye is needed to make
twenty 55-gallon drums of diestock?

[88bobcat]

[calcguy]

Please allow me to respectfully point out a small correction to the dyestock problem.
10 Tbsp = 5 oz
When you add 5 oz of dye to 1 gal of water, you have (128 + 5) oz of dyestock.
5 oz/(128 oz + 5 oz) = x gal/(20 x 55 gal)
x = 41.4 gal

[AuSmith]

[88bobcat]

[uglydawg360]

thanks for the help

[uglydawg360]

K I need help on some of the geometry problems
First 06E-60 i tried solving using law of cosine to the find the third side then found all three angle in the middle triangle and the leftmost side then used law sines to find the missing side. But i my answers is a bitt off. SO Can some one explain throughly

09f-60 k so i used the law of cosine to the find all the angles of the triangle with side length 508. Since AB is straight i subtracted 90 and the and angle from that i found which was 12.48 from 180 to get 77.52 for the angle on the triangle with side length 830. Using law of sines I found the base of the triangle and using the base and the opposite side i found the angle in rad. BUt again i was bit off like barley i didnt even round. SO can some explain how i would solve for that angle.


04E-70
07C-60
04d-80

[AuSmith]

[uglydawg360]

Yes i did get 1.88
and how did u get 108 degrees for 04d-80

[AuSmith]

[stupidityismygam]

[uglydawg360]

So anyone figure how to do the scalene triangle and get an answer other than 1.88

For the parallelogram I did pi-1.08 and got 2.06 then use law of cosine to solve for the big side 207 but then i m lost seriously i tried every way to find angles and the side any hints?


Also need help on study list the last one left to finish 08D-36

Thanks in advance

[AuSmith]

[stupidityismygam]

[AuSmith]

Oh, shucks. The wiki page gives some more explanation. The law of sines still works, but [unparseable or potentially dangerous latex formula] is not [unparseable or potentially dangerous latex formula] on [unparseable or potentially dangerous latex formula].

[uglydawg360]

08D-36. What percent of the earth’s surface can be seen in
an airplane flying at 30,000 ft elevation? Neglect
refraction.





plz this is the only one that i havent solved and i havent seen this in any of the test this year yet

[88bobcat]