Science & Mathematics - 3 December 2006

2006-12-03 22:38:31 · 8 answers · asked by narendersinghkundu 1 in Engineering

2006-12-03 22:35:38 · 10 answers · asked by Anonymous in Zoology

2006-12-03 22:34:58 · 3 answers · asked by Anonymous in Botany

plz read the following very carefully.
we do work to move a box on an inclined plane...
we have to prove that work done = fs cos theta
for proving f s cos theta:
we can do by 2 methods,...

1)by finding the component of displacement of body in the direction of force.

here,...surely the work we are finding is the work we do in that particular direction?
so ...it is not equal to the full work ?

2)we find the component of force applied in the direction in which the object oves on the inclined plane.
as this is the direction in which the object is movng ,..surely this is the total work done.?

but in accord with the first method...we got ...F * S cos theta
in accord with the 2nd method,...we got ...Fcos theta* S
so both of them are equal...but how can that be when one is measuring only work along a specific direction and the other work in the whole?

i would really prefer an explanation in logic rather than by mathematics.
i know it will take time...but plz do help.

2006-12-03 22:33:33 · 7 answers · asked by catty 4 in Physics

I have a home work in gene maping problems
I dont know how to do it
please can any one help me
I feel like I want to cry
please if there is anyone who is interested in Genetics, please help me, please ,please
u can contact me on my msg to discuss the probelms
missitalian_9@yahoo.com

2006-12-03 22:32:57 · 3 answers · asked by Cinderella 3 in Biology

2006-12-03 22:28:56 · 10 answers · asked by Anthony R 4 in Physics

A 4500-kg helicopter accelerates upward at 2.0m/s squared. What lift force is exerted by the air on the propellers?

Please show work so i can understand.....thanks

2006-12-03 22:28:16 · 3 answers · asked by Anonymous in Physics

explaine about sado point in matrix

2006-12-03 22:28:11 · 3 answers · asked by bhaskar 1 in Mathematics

which number is called perect number? give me some examples

2006-12-03 22:24:20 · 11 answers · asked by bhaskar 1 in Mathematics

A Circle, radius 3 centered at the point (1, 1) and the line y=2x+1

I already know the formula r^2 = (X-a)^2 + (mx+c-b)^2

I just can't understand how to getan answer. (Please answer in steps so i can understand easier).

2006-12-03 22:19:27 · 6 answers · asked by Chris 4 in Mathematics

2006-12-03 22:15:17 · 10 answers · asked by benjaminbrum 2 in Earth Sciences & Geology

2006-12-03 22:14:32 · 5 answers · asked by benjaminbrum 2 in Earth Sciences & Geology

the gravitational force of the sun pulls every planet towards it including earth then why doesn't the planets bang with the sun but keeps on revolving around the sun at a distance

2006-12-03 22:13:19 · 10 answers · asked by Daksh Jain 1 in Astronomy & Space

2006-12-03 22:09:09 · 6 answers · asked by jbee 1 in Engineering

2006-12-03 22:08:38 · 6 answers · asked by Anonymous in Geography

2006-12-03 22:06:43 · 18 answers · asked by frank s 2 in Geography

2006-12-03 22:05:43 · 22 answers · asked by pixie_stick 1 in Medicine

There are a pack of birds on one side of the tree and another pack of birds on the other side of the tree.

#1 one pack of birds says to the other pack of birds. "if one of you's comes to our side we will be double then you's in number". e.g ratio 1:2

and the second pack of birds reply, "if one of you's comes to our side we will be even in number" e.g ratio 1:1

Now what are these numbers?

meaning how many birds are there in one pack of birds compared to the other pack of birds on the others side,

i will add a hint later if no ones get it. ;)

2006-12-03 22:02:46 · 6 answers · asked by year 12 student 2 in Mathematics

2006-12-03 21:58:19 · 1 answers · asked by Anonymous in Chemistry

Does Nocturnal emission occur only with men?

2006-12-03 21:56:25 · 5 answers · asked by aramaiya 3 in Biology

Assuming that 1 inch = 2.54 cm, what is 820 cm in feet?

2006-12-03 21:55:30 · 11 answers · asked by yadayadayada192 1 in Mathematics

2006-12-03 21:48:34 · 2 answers · asked by chua77 1 in Weather

i donno plz answer!!!

2006-12-03 21:46:43 · 13 answers · asked by pixie_stick 1 in Zoology

what are bench acids and alkalis?(i know what acids and alkalis are)
can you name 3 of each
what is meant by OH- and H+

2006-12-03 21:35:05 · 3 answers · asked by Anonymous in Chemistry

like what the hell is the squareroot of 31? How do you find out?

2006-12-03 21:31:37 · 8 answers · asked by Anonymous in Mathematics

2006-12-03 21:26:36 · 3 answers · asked by t2001ger 1 in Engineering

2006-12-03 21:26:15 · 2 answers · asked by Anonymous in Physics

2006-12-03 21:25:36 · 10 answers · asked by i_need_a_username97 1 in Mathematics

2006-12-03 21:21:50 · 10 answers · asked by Aries Jordan E 1 in Chemistry

2006-12-03 21:20:30 · 4 answers · asked by alain_akira03 1 in Biology