Science & Mathematics - 1 October 2007

i have to do a lab to find the coefficient of friction. In this lab, we must slide a block down an inclined plane. we have to find the following forces. Fp = Force of parallel, Fn = Force of Normal, and Ff = Force of Friction. Also I have to find the coefficient of friction (μ). I have no idea how to find it but so far i have the angle of the slope (27°) and the Fw (force of weight) which is 1.1N. Youre suppose to use trignometry to find these values. Also Fp equals Ff in magnitude in this trial and you can calculate the coefficient of friction after obtaining all this other info. Ff is equal in magnitude and opposite in direction to Fp. I've provided an rough image of how everything looks like.

http://img.photobucket.com/albums/v146/xplicitbabs/physics.jpg

2007-10-01 18:10:07 · 1 answers · asked by Anonymous in Physics

Some vegetables wilt as they age. explain this occurence in the terms of osmosis. describe how you can use osmosis to restore the crispness of such vegetables.

2007-10-01 18:09:09 · 7 answers · asked by Jim G 2 in Biology

False:A function f is differentiable at c if its graph has a
tangent line at the point (c; f(c)).

on the other hand
True: If the graph of the function f has a tangent line at the point (c,f(c)) then f is differentiable at c.

2007-10-01 18:08:35 · 3 answers · asked by shevchenko 1 in Mathematics

using the senses immediately available to you (sight,smell,touch)

2007-10-01 18:04:29 · 4 answers · asked by Tikoy 1 in Botany

...using the elimination method to solve for the equation

5x +4y = -3

-7x - 8y = -3

... also using the the elimination method to solve this.

2x + 3y= -12

7x+ 7y = -28

and also by using substituting method

6x + 7y = -29

x= -2 - 4y

2007-10-01 18:03:18 · 8 answers · asked by studentez 1 in Mathematics

2007-10-01 18:02:13 · 2 answers · asked by I_color_outside_the_lines 4 in Biology

1) what is the sum of the number of corners, sides, and edges on a cube?

2) In what year will the USA celebrate its tercentennial?

3) When John Hancock signed the Declaration of Independance, his age was a multiple of 13 and the sum of the digits was 12. How old was he when he signed the document?

4) The diameter of a tennis ball is 2.5 inches. How many tennis balls can fit in a can 2.5 across and 1 foot long.

5) The largest painting in existance is the "Battle of Gettysburg." it weighs 1792 more pounds than 5 tons. how many pounds does it weigh?

2007-10-01 18:01:08 · 7 answers · asked by Natalie 1 in Mathematics

For Monday morning's staff meeting, Jim bought 2 bags of bagels and 3 packages of cream cheese and paid $12.00 (excluding sales tax). For Friday's meeting, he bought 4 bags of bagels and 2 packages of cream cheese and paid $14.00 (again, excluding sales tax). How much do bags of bagels and packages of cream cheese cost?

2007-10-01 18:01:07 · 3 answers · asked by Lady E 1 in Mathematics

Without using graphing calculator, is it possible to find all the asymptotes of:

y = cos^2(x) / (x^2) ?

I can find one, when x = 0, but the book also has y=0. Any ideas how I can approach that?

2007-10-01 17:57:19 · 3 answers · asked by Anonymous in Mathematics

show that the function F(x) = [(x-a)^2 * (a-b)^2] +x takes on the value (a+b)/2 for some value of x.

2007-10-01 17:57:02 · 2 answers · asked by shishi 1 in Mathematics

Im helping my friend with her homework and there was 1 question i couldnt figure out, i think the question deals with converting but i dont know if my reasoning is true and if does deal with converting how can i convert kilograms to meters?
please help me my brain hurts and i still have homework to do, well i think im finished. sorry to go off the subject. =)

2007-10-01 17:54:38 · 16 answers · asked by Kimberley M 1 in Mathematics

1) There are two equations for power consumed by a device:

P = I²R
P = V²/R

The first expression indicates that Power is directly proportional to R whereas the second expression indicates inverse proportionality.
How can the seemingly different dependence of P on R in these expressions be explained?



2) An electrician puts a fuse of rating 5A in that part of domestic electrical circuit in which an electrical heater of rating 1.5kW, 220V is operating. What is likely to happen in this case and why? What change, if any, needs to be made?

2007-10-01 17:53:54 · 9 answers · asked by Akilesh - Internet Undertaker 7 in Physics

2007-10-01 17:53:04 · 4 answers · asked by ck 1 in Biology

its been raining alot in Aventura,FL and before going to school this morning around 6 it was still dark and there was a very heavy thunderstorm but i saw something strange is saw 3 green flashes of light one on the street, one in the air, and another next to a condo these seem to be lamps that light during thunderstorms but since I saw on in the air it freaks me out they flash and go away they seem like explosions the light seems to come from the lightning and then spread and stop help?

2007-10-01 17:49:16 · 2 answers · asked by Virgilio C 1 in Weather

2007-10-01 17:47:41 · 6 answers · asked by curzon17 1 in Mathematics

You could write formulas to find the perimeter and area of each figure. Then find the perimeter and area of each figure. Show your work. :)

1. Pretend there is square box here. 7 cm on the right and 9.6 cm on the bottom.

Could someone please help me with these. i dont get it.

2007-10-01 17:47:36 · 4 answers · asked by Anonymous in Mathematics

I think i know the answer but i dont know why
i need it done in like a step by step process so i can know how to do these kind myself thanks so much!

(x-5)squared

is the answer x squared-10x+25
if so, why?

2007-10-01 17:46:08 · 9 answers · asked by Angelica 1 in Mathematics

i need help with my geometry homework, and im stumped.
im staying up late trying to figure it out,
and i cannot get this one.
everyone at my house is asleep, so i cant ask for help.
can anyone help me?
give me the answer?
explain it to me?
show me how to do it so i can do it on my own?

whatever you want to do,
just as long as i can get the answer out of it.
i need it by 6 am today, and it counts for alot.
and no, i cannot miss it.
PLEASE HELP!!
=]

2007-10-01 17:46:03 · 10 answers · asked by m3aghanFTW 2 in Mathematics

i don't know the answer to these questions. but i've dont everything else..

3. When viewing a cell under the microscope how can you tell if it has depth or thickness?
9. Why can’t cheek cells and onion cells carry out photosynthesis?
5. Why do we stain cells when sometimes viewing them?
17. What's the cell theory?

2007-10-01 17:42:11 · 2 answers · asked by mnc 1 in Biology

Can someone explain the quantum theory to me?? Good answers plz

2007-10-01 17:42:05 · 4 answers · asked by Anonymous in Physics

2007-10-01 17:40:20 · 3 answers · asked by shayma h 1 in Physics

A particular balloon can be stretched to a maximum surface area of 1257 cm^2. The balloon is filled with 3.2 L of helium gas at a pressure of 759 torr and a temperature of 292K . The balloon is then allowed to rise in the atmosphere. Assume an atmospheric temperature of 273 K and determine at what pressure the balloon will burst. (Assume the balloon to be in the shape of a sphere.) This is confusing. It doesn't look like any gas laws I know!

2007-10-01 17:39:38 · 3 answers · asked by Giant Donut 2 in Chemistry

find the equation.
1. x: 0,3,6,10
y: 20,8,-4,-20
2. x: 2,4,6,8
y: 5,8,11,14

3. x:0,3,6,9
y:20,11,2,-7

2007-10-01 17:38:47 · 1 answers · asked by Anonymous in Mathematics

Why do pancreas cells have more ribosomes then another part of the body... I know that ribosomes synthesize proteins... Why are proteins important for the pancreas ? Is it because of the production of insulin ?

THanks

Ciao ;)

2007-10-01 17:34:33 · 5 answers · asked by Anonymous in Biology

2007-10-01 17:32:56 · 8 answers · asked by TicToc.... 7 in Astronomy & Space

At the starting gun, a runner accelerates at 1.9 for 4.8 . The runner's acceleration is zero for the rest of the race.

What is the speed of the runner at ?

What is the speed of the runner at the end of the race?

2007-10-01 17:31:46 · 3 answers · asked by razac24 1 in Physics

what would have the highest specific gravity (SG) and urine volume : 600 ml of coke, 100 ml of water (control group), 600 ml of water and drink 100mL of water, then 5-10 min of vigorous exercise. ?

please provide explanation for choices and provide a link to follow

thanks.

2007-10-01 17:30:52 · 1 answers · asked by Anonymous in Medicine

2007-10-01 17:30:34 · 8 answers · asked by sweets 1 in Physics

like does one or the other allow you to solve more basically?

2007-10-01 17:30:10 · 3 answers · asked by Anonymous in Physics

I've seen it used near physical therapies and haven't been able to find it on the information superhighway.

2007-10-01 17:29:16 · 3 answers · asked by Anonymous in Medicine