Science & Mathematics - 17 October 2006

A roller coaster at an amusement park has a dip that bottoms out in a vertical circle of radius r. A passenger feels the seat of the car pushing upward on her with a force equal to six times her weight as she goes through the dip. If r = 20.5 m, how fast is the roller coaster traveling at the bottom of the dip in m/s?

2006-10-17 03:48:58 · 2 answers · asked by blah 1 in Physics

1)3 g
2)30 g
3)300 g
4)3000 g

2006-10-17 03:48:56 · 6 answers · asked by Shodan 2 in Physics

2006-10-17 03:47:32 · 2 answers · asked by Tom M 1 in Chemistry

An aircraft has a take off velocity of 240 km/hr. What is the length of the runway needed at the airport if the average accelararation of the aircraft along the ground is 2.5 m/sec^2?
1) 90m
2) 490m
3) 980m
4) 9800m

2006-10-17 03:43:58 · 10 answers · asked by Shodan 2 in Physics

2006-10-17 03:43:55 · 12 answers · asked by nina r 1 in Earth Sciences & Geology

Hey it is said that according to the environmental balance the percentage of NITROGEN is around 71 and oxygen is about 27
Nd that of carbondioxide is nearly 1
Dont mind about the denominationssss i dont remeber properly/
the main source of oxygen for us is the trees, which releases co2 during nights. So there should be some imbalance here
But this is not happening
can any one explain y ???

2006-10-17 03:43:03 · 4 answers · asked by PhoenixBird 3 in Earth Sciences & Geology

2006-10-17 03:42:07 · 11 answers · asked by petsa 1 in Astronomy & Space

2006-10-17 03:38:12 · 7 answers · asked by bundyal38 2 in Other - Science

Is it a proten change or electrical, how is the memory stored? Will it be posable to scan the brain of an educated person and copy the education to a new person? Is it worth putting a dead persons brain in liquid nitrogen in the hope the data could be recovered in the future.

2006-10-17 03:37:37 · 11 answers · asked by Anonymous in Biology

The sum of two numbers is 43. One number plus three times the other number is 65. What are the numbers?

2006-10-17 03:37:15 · 14 answers · asked by sylviachencho 2 in Mathematics

2006-10-17 03:34:31 · 4 answers · asked by Anonymous in Zoology

2006-10-17 03:31:46 · 2 answers · asked by stephen r 1 in Biology

2006-10-17 03:31:40 · 10 answers · asked by rrajilal786 1 in Physics

suppose a roller coaseter passes point one (summit of a hill) at a height of 35m amd a speed pf 1.70m/s. if the average force of frictions is equal to one-fifth of its weight, what speed will it reach point 2 (the bottom of the hill) at 0m? the distance traveled is 45.0m.

2006-10-17 03:31:04 · 2 answers · asked by Anonymous in Physics

Doing a science experiment with low ph's dissolving chalk. The chalk dissolves in oj, yet in cola it does not? Why? is it the carbonation or the phosphoric acid vs citric or ???? Thank you

2006-10-17 03:30:54 · 5 answers · asked by MM 1 in Chemistry

Calculate the pH of the solution resulting from the addition of 25.0 mL of 0.250M ammonia and 55.0 mL of 0.250 M HCl solution.

I got 5.18 for the pH but im not so certain I did it right, can anyone else solve this and tell me what you got. does the # sound good? Im not sure I used the write method to solve it..

2006-10-17 03:30:35 · 3 answers · asked by farxfromxlonelyx 1 in Chemistry

Ten crisp points for a breakdown of what's dodgy about this report!
(Mind you, might be quicker to list what they got right!)
http://www.wetaskiwintimes.com/News/260939.html

2006-10-17 03:30:29 · 8 answers · asked by Avondrow 7 in Astronomy & Space

2006-10-17 03:24:23 · 4 answers · asked by Rajeev_S_R N 1 in Physics

2006-10-17 03:23:48 · 6 answers · asked by Chris the Great 1 in Chemistry

My nail form my big toe is dead.Should I just take it off? How do I look after my toe after that? eg wrap in bandage.

2006-10-17 03:21:34 · 9 answers · asked by AE_73 2 in Medicine

2006-10-17 03:20:48 · 9 answers · asked by Rajeev_S_R N 1 in Physics

a. life costs zero
b. that life has a value of infinity
c. that the value is too large to state
d. that the value of life is an imaginary number

2006-10-17 03:19:58 · 27 answers · asked by Tony R 1 in Mathematics

2006-10-17 03:18:44 · 4 answers · asked by xtra_sweetgrl 1 in Other - Science

a. a straight line
b. a vertical line
c. a parabola
d. decreasing

2006-10-17 03:16:08 · 10 answers · asked by Tony R 1 in Mathematics

2006-10-17 03:14:18 · 6 answers · asked by md_free23 1 in Earth Sciences & Geology

http://www.newscientistspace.com/article/dn10311-space-elevators-to-heave-themselves-skyward.html


What do you think about that?

2006-10-17 03:13:34 · 9 answers · asked by mmd 5 in Astronomy & Space

If each space represents 1 foot,how tall is the ramp?
a.3 feet
b. 4 feet
c. 1 foot
d. 2 feet

2006-10-17 03:13:24 · 5 answers · asked by Tony R 1 in Mathematics

2006-10-17 03:12:51 · 6 answers · asked by Anonymous in Other - Science

2006-10-17 03:09:01 · 18 answers · asked by vinayaka n 1 in Other - Science

think & answer.

2006-10-17 03:08:39 · 10 answers · asked by Anonymous in Other - Science