Science & Mathematics - 12 October 2006

While running, a person dissipates about 0.60 J of mechanical energy per step per kilogram of body mass. If a 52 kg person develops a power of 64 W during a race, how fast is the person running? (Assume a running step is 1.5 m long.)

2006-10-12 08:33:07 · 5 answers · asked by activegirl 1 in Physics

In trying to use a GPS receiver to determine "sunrise", the answer given was not what I want. I need to determine the time at which early morning twilight begins (eg. still totally dark) when all I have is the time of sunrise.
Given the variables of :elevation on the earth , level surrounding terrain, time of the season, etc...What is the number of minutes I subtract from "sunrise", as given by a GPS unit, to arrive at that time at which early morning twilight will begin (but is still completely dark)?

2006-10-12 08:33:03 · 4 answers · asked by Jim B 1 in Astronomy & Space

i think it should of done. what do u think?

2006-10-12 08:28:59 · 14 answers · asked by chatterbox0492 1 in Earth Sciences & Geology

i've had a long hard day at work and the wine tasted soooooooooooo good... am i the only one bit rat arsed on here tonight?

2006-10-12 08:25:47 · 8 answers · asked by lil missy 2 in Other - Science

Does anyone know why humans (and other primates) have an external occipital protuberance? In quadropeds it serves as an attachment point for a ligament that supporst the weight of the head, so I'm thinking it may be a holdover from our ancestors. In primates all it does is serve as an attachment for a ligament and trapezoid muscles. Any other significance of it?

2006-10-12 08:22:22 · 3 answers · asked by darcy_t2e 3 in Biology

2006-10-12 08:22:09 · 11 answers · asked by Abdul Karim 1 in Astronomy & Space

A 0.05kg arrow is launched vertically into the air. The bowstring exerts an average force of 53N on the arrow over a distance of 0.75m.
a) with what speed does the arrow leave the bow
b) how high will the arrow travel. neglect air resistance

thanks!

2006-10-12 08:20:57 · 3 answers · asked by vanilea 2 in Physics

2006-10-12 08:16:53 · 18 answers · asked by Dana B 1 in Physics

2006-10-12 08:16:25 · 13 answers · asked by Anonymous in Physics

2x > -6 and x - 4 < 3

x + 3 > 2x + 1 and -4x < -8

-6 < x + 3 < 6

-3x > -6 or x - 5 < 2

x - 2 > 2x + 1 or 10 > -2x + 2

Could someone please help me solve these? They are the last questions on my test review.

2006-10-12 08:15:55 · 4 answers · asked by Brad 1 in Mathematics

2006-10-12 08:13:56 · 14 answers · asked by Anonymous in Biology

2006-10-12 08:11:19 · 3 answers · asked by Patrick 5 in Engineering

tongue,after sheng, swahili, arabi, n mandalin. But of course I have never snobbed(Tell me the sp of that) the mixed language, ts funny, and, may be, I don"t know----I need to meet Wole Soyinka or V S Naipaul-----who doesn"t love fun? well my worry was, how do one learn english to its full?

2006-10-12 08:09:56 · 4 answers · asked by Anonymous in Other - Science

2006-10-12 08:08:25 · 2 answers · asked by kelleygaither2000 1 in Physics

I"ve got an F in math! I pay attention and all that crap! I just don't turn my stuff in. How do I remember to get all my stuff in, and get it done!!!!!!!!

2006-10-12 08:04:21 · 11 answers · asked by free2luvbob 2 in Mathematics

In the form (x +/- a)(x +/- b) stating the value of a, b and c, where c is an integer.

2006-10-12 07:59:07 · 11 answers · asked by bjw3rt 1 in Mathematics

2006-10-12 07:58:05 · 4 answers · asked by Jack G 3 in Earth Sciences & Geology

A ->->-> B

A cyclist travels from A to B. At A she is travelling at 8m/s. She descends a vertical distance of 20m to the bottom of the hill from A. The road eventually rises 12m vertically to B. At B she is travelling at 5m/s. She and the bike have a mass of 80 kg. The total distance along the road from A to B is 500m. There is a constant resistance of 20N. What is the work done from A to B? At B the road is horizontal. She is accelerating at 0.5m/s/s. What is the power generated by her at B?

2006-10-12 07:51:47 · 6 answers · asked by Anonymous in Mathematics

in titration of acetic asid with NaOH,what will happen if we add more indicator?

2006-10-12 07:50:49 · 2 answers · asked by NaZaniN e NaZaniN 1 in Chemistry

2006-10-12 07:47:09 · 28 answers · asked by Adele W 1 in Mathematics

why does time go faster when we are asleep

2006-10-12 07:45:02 · 13 answers · asked by Anonymous in Biology

I meant the Glass which used in Car Windshield, Mirror etc..

2006-10-12 07:40:56 · 16 answers · asked by Issac J 1 in Engineering

2006-10-12 07:40:00 · 5 answers · asked by jame2226 1 in Zoology

How many days lapse and how far does it travel in 1 orbit around the Sun?

2006-10-12 07:38:15 · 28 answers · asked by exert-7 7 in Astronomy & Space

2006-10-12 07:35:53 · 12 answers · asked by chopperchick 1 in Zoology

Three friends pool money for a DVD - it cost 15 dollars. They go to another friends shop and ask him for a discount - he is not there so they are charged 15 dollars for the DVD. After they leave their friend comes back and tells his assistant to return 5 dollars to the three friends, the assistant pockets 2 dollars, returning just 3 dollars to the three friends. So each friend gets back 1 dollar and ends up just spending 4 dollars for the DVD. 4x3=12 So that means the DVD actually cost them 12 dollars. Add this to the amount pocketed by the assistant and it is 12 + 2 = 14 and not 15 dollars so tell me where did the other 1 dollar go?

2006-10-12 07:34:19 · 6 answers · asked by Tooling~guy 2 in Mathematics

Hello. I'm taking a class at my college called Criminal Evidence. I overheard another student say if you're drinking cranberry juice and someone slips a date rape drug inside, the cranberry juice cancels it out. How true is that? And why does it happen, if it's true? Please, only serious answers!

2006-10-12 07:33:45 · 14 answers · asked by Kellie 3 in Chemistry

A car radio designed to operate with a 6.3V battery uses 4.5A of current,


a) If we wanted to use a 12.6V battery, what resistance should be placed in series with the radio to keep the same operating conditions?

2006-10-12 07:32:34 · 7 answers · asked by Anonymous in Engineering

2006-10-12 07:32:20 · 16 answers · asked by Andy C 1 in Astronomy & Space

Sometimes in the early night hours as the moon appears over the horizon the moon looks huge but as it moves overhead in the sky its apparent size gets much smaller. I would think that the moon at the horizon is further away from me than when its directly above.

2006-10-12 07:30:56 · 9 answers · asked by abel g 2 in Astronomy & Space