Science & Mathematics - 10 October 2007

1)Surprisingly, very few athletes can jump more than 2.2 ft (0.68 m) straight up. Use d = 1/2 gt2 and solve for the time one spends moving upward in a 2.2 foot vertical jump. Then double it for the "hang-time" -- the time one's feet are off the ground.


2)A car takes 10 s to go from v = 0 to v = 30 m/s at approximately constant acceleration. If you wish to find the distance traveled using the equation d = 1/2 at2, what value should you use for a?

3)What is the acceleration of a vehicle that changes its velocity from 130 km/h to a dead stop in 13 s?

2007-10-10 14:43:18 · 1 answers · asked by eaglesblueflag 1 in Physics

2007-10-10 14:42:05 · 3 answers · asked by stewie8675309 2 in Chemistry

What organic compound should be the main source of energy for living things?

What type of organic compound gives you the most energy?

2007-10-10 14:40:03 · 1 answers · asked by Ball_til_ya_fall 2 in Biology

2007-10-10 14:39:33 · 2 answers · asked by Joe T 1 in Mathematics

measuring matter

2007-10-10 14:36:50 · 7 answers · asked by ROCHELLE Y 1 in Physics

Is it the electron orbital? Please help!

2007-10-10 14:34:17 · 3 answers · asked by Claire 3 in Physics

And about what year will it be?

2007-10-10 14:33:08 · 27 answers · asked by Kentucky Dave 6 in Astronomy & Space

Question

-35/6X(-1/-14)-(1/3-5/8)/(4/9)

My teacher said the answer is 1.177083333. However my answer is 0.239583333. Nobody in my class can get her answer..am I crazy? am I right?

2007-10-10 14:31:55 · 2 answers · asked by Doug V 2 in Mathematics

In a neighborhood of the point a, the level curve C ={x is a element of R^2 : f(x) = c } can be parameterized by a differentiable function g:(-e,e)->R^2 with g(0)=a use the Chain Rule to prove that gradient f(a) is orthogonal to the tangent vector to C at a
any help on solving this question is much appreciated!

2007-10-10 14:30:32 · 1 answers · asked by Dr H 2 in Mathematics

2007-10-10 14:30:28 · 1 answers · asked by ROCHELLE Y 1 in Physics

The number of inches in the perimeter of an equilateral triangle equals the number of square inches in the area of its circumscribed circle. what is the radius, in inches, of the circle?

thanks, =)

2007-10-10 14:30:01 · 2 answers · asked by *vikko* 2 in Mathematics

What is the derivative of:

f(x)=(1+x^2)e^(-x^2)


i got f'(x)=2x(1+x^2)e^(-2x) , but i think thats wrong...

2007-10-10 14:29:29 · 1 answers · asked by PunPride 2 in Mathematics

what ius 1/3 of 6/7? how did you get that answer?

2007-10-10 14:26:20 · 9 answers · asked by bball+life=:) 3 in Mathematics

What would the cfms be if a 12x12 piece of duct was blowing 2000 fpms?

2007-10-10 14:25:30 · 2 answers · asked by Anonymous in Engineering

2007-10-10 14:25:18 · 5 answers · asked by massiel c 1 in Chemistry

I don't see a place to go to the next page. Is this a really new category??? I know I just found it...but how long has it been on here?

2007-10-10 14:22:48 · 5 answers · asked by Deenie 6 in Paranormal Phenomena

2007-10-10 14:20:05 · 3 answers · asked by COCO CHANEL 2 in Weather

2007-10-10 14:17:40 · 3 answers · asked by Lynni Latosa 1 in Astronomy & Space

2007-10-10 14:15:19 · 9 answers · asked by Average Joes 4 in Chemistry

Heres the question..

A box contains 3 red blocks, 7 blue blocks, and 4 white blocks. If a block is selected at random, what is the probabiliy of selecting a white block.

A. 7/14 C. 3/7

B. 5/14 D. 2/7

2007-10-10 14:14:58 · 9 answers · asked by Anonymous in Mathematics

what is planet mercurys orbital period, or duration of 1 orbit around the sun

2007-10-10 14:14:03 · 4 answers · asked by Missy 1 in Astronomy & Space

2007-10-10 14:12:44 · 2 answers · asked by Missy 1 in Astronomy & Space

2007-10-10 14:11:18 · 2 answers · asked by Missy 1 in Astronomy & Space

Use the factor theorem to show that x-c is a factor of P(x) for the given values of c, where
P(x)=x^3-5x^2+7x-3, c=1

The quotient ?
the remainder ?
please find the quotient and the remainder
i know how to do thid i just need to check my answer with your answer so i could know if i did it right

2007-10-10 14:11:06 · 5 answers · asked by star baller 360 5 in Mathematics

Can anyone help with this qn?

Over a specified period, observers sighted 200 birds at a particular location. The birds were
classified into four species as shown in the table below. The previously known proportion of
species for that location was 3:3:3:1.
Species 1 2 3 4 Total
No. of birds 46 74 65 15 200
(Source: P.V. Rao (1998), Statistical Research Methods in the Life Sciences, Duxbury
(a) Calculate the expected number of birds for each species, assuming that the composition
of species has not changed.
(b) Is there evidence to suggest that the composition of the species in that location has
changed? Conduct the appropriate test.
(c) With reference to the observed and expected values write an informative conclusion.

2007-10-10 14:08:15 · 2 answers · asked by Anonymous in Mathematics

Man is the great inventor. If we use up all the oil, we will simply invent new technology to thrive and survive. Look at how we've responded with the green movement. I have faith in humankind!

2007-10-10 14:06:41 · 8 answers · asked by Dan L 1 in Earth Sciences & Geology

For a biologogy report.
I'm supposed to list three answers.
so far I've got
a. Wasps eat some harmful pests.
b. Wasps eat decaying debris (dead animals and food)

I just need one more but I've looked it up, and I can't find anything.

2007-10-10 14:04:50 · 5 answers · asked by Haley B 2 in Zoology

A bucket of water with mass 6.40 kg is accelerated upward by a cord of negligible mass whose breaking strength is 65.0 N .

2007-10-10 14:04:13 · 2 answers · asked by Anonymous in Physics

A 1000 N crate is being pushed across a level floor at a constant speed by a force of 500 N at an angle of 20.0° below the horizontal. Need help finding coeficient of kinetic friction between the floor and the crate. explanation would also be very helpful and appreciated.

2007-10-10 14:04:05 · 1 answers · asked by caycetw23 1 in Physics

A spacecraft descends vertically near the surface of Planet X. An upward thrust of 25.0 kN from its engines slows it down at a rate of 1.20m/s^2, but if an upward thrust of only 10.0 kN is applied, it speeds up at a rate of 0.80m/s^2.

2007-10-10 14:02:17 · 1 answers · asked by Anonymous in Physics