Mathematics - 3 September 2007

2007-09-03 02:53:53 · 9 answers · asked by Anonymous

the question. solve m(dv/dt) = mg - kv^2 .. (ordinary differential eq.)

then.. a man and a parachute are falling with a speed of 173 ft/sec. when the parachute opens and the speed is reduced so as to approach the limiting value of 15 ft/sec. by air resistance proportional to the square of the speed.

show that

t = (15/2g)ln((79/94).[(v+15)/(v-15)])

i have tired thinking.. still cant show that.. :(

2007-09-03 02:49:53 · 1 answers · asked by fareez 1

2007-09-03 02:38:35 · 8 answers · asked by Anonymous

(x+y)^4

How does this expand/factor? I know there is some sort of pattern, but I forgot it.

If you can factor it, that would be great, or if you just know the factoring pattern... that would be great too! Thanks for any and all help!

2007-09-03 02:33:34 · 2 answers · asked by lovely_laura002 2

2007-09-03 02:32:42 · 6 answers · asked by Anonymous

2007-09-03 02:31:15 · 2 answers · asked by Anonymous

2007-09-03 02:30:02 · 2 answers · asked by Anonymous

http://img108.imageshack.us/img108/1042/untitled2qo3.jpg

Pic included!

2007-09-03 02:28:29 · 2 answers · asked by zerokun4 1

At CMS there are 950 students. Each student chews 1oz per day. If their are 180 days... How man tons did they chew?

I got:
171000oz &&
0.0029687 ton.

2007-09-03 02:03:42 · 2 answers · asked by Beautiful Disaster 2

calculate the limit

2007-09-03 01:51:44 · 2 answers · asked by Deutschjoe 3

i - root of -1

2007-09-03 01:15:53 · 4 answers · asked by Anonymous

David is swimming upstream from a dock at a constant rate. After he has swum 400 metres, he meets Julie who is floating downstream on an air-mattress. He contiunes to swim upstream for a further 10 minutes before turning round and swimmind back to the dock, which he reaches ar the same time as Julie. Assume that David's swimming is constant relative to the water and that the current has constant speed of x metres per minute. Find x.

2007-09-03 01:14:00 · 1 answers · asked by Anonymous

i forgot :( help please!

2007-09-03 00:24:51 · 7 answers · asked by Anonymous

1- sodium + water ----> sodium hydroxide + hydrogen
2- Magnesium + steam ----> magnesium oxide + hydrogen
3- Hydrogen + mitrogen ----> ammonia
4- Magnesium + carbon dioxide ---> magnesium oxide+carbon

2007-09-03 00:14:17 · 2 answers · asked by Roller 2

2007-09-03 00:13:33 · 3 answers · asked by gie 1

Why is it called the x-axis and y-axis, instead of a-axis and
b-axis! If you know please answer! If you find it on a website please put the website! I rreeaallyy need it!

2007-09-03 00:11:50 · 6 answers · asked by ♪♫D Tran♪♫ 1

iam here 4 years and i finished the school in 2 - 3 years and those things they teach us right now to maths i ve already done them to school at my country (cyprus ) its near greece this thing happens to all schools ???

2007-09-03 00:00:50 · 2 answers · asked by angus young 1