Science & Mathematics - 8 October 2007

The drawing shows a circus clown who weighs 960 N. The coefficient of static friction between the clown's feet and the ground is 0.52. He pulls vertically downward on a rope that passes around three pulleys and is tied around his feet. What is the minimum pulling force that the clown must exert to yank his feet out from under himself?

like, i can't even find a place to start. it is 11:30 at night and im tired and just want to finish this homework and go to sleep. please, Please help me. you don't even have to fully explain your work. i just need help.

thank you so much!

2007-10-08 16:31:39 · 3 answers · asked by Elizabeth 3 in Physics

the drawing is like this
5 is osn top adjacent to 3. 4 is down more on the same line.
There is one line going through 5 and 3 to make an angle. Another line goes under 4 to make an angle.

2007-10-08 16:29:05 · 2 answers · asked by j money 2 in Mathematics

Nine is subtracted from a number, and then the difference is multiplied by 5. The result is 75. What is the number?

2007-10-08 16:27:55 · 11 answers · asked by Anonymous in Mathematics

The steel I-beam is basically a crane with a triangle it is liftling. the triangle is isosceles with two 70 degree angles and one 40 degree angle. it has a weight of 9.30 kN and is being lifted at a constant velocity. What is the tension in each cable attached to its ends?


i know that the velocity is constant so a=0, and the sum of the forces =0. and i know mg = 9300 N, not 9300*9.8 m/s^2. You do not multiply by 9.8, since you are given the weight, not the mass.

so....

t1~tention 1
t2~tention 2
in the y dirrection: t1 sin theda1 + t2 sin theda2=0
in the x dirrection, t1 cos theda1 + t2 cos theda2=0

i understand that if you make a triangle, t1 is the hypotenuse, t1y=1/2 fg, and t1x would be one the bottom.

so t1y=1/2mg/sin70

that is as far as i could get with this problem. see, i really did try to do it. i just can't finish it. please, PLEASE help me. i really am trying!

2007-10-08 16:27:34 · 1 answers · asked by Elizabeth 3 in Physics

2007-10-08 16:23:41 · 3 answers · asked by Burnt Toast 1 in Chemistry

2007-10-08 16:22:12 · 3 answers · asked by Anonymous in Chemistry

2007-10-08 16:21:18 · 8 answers · asked by I walk,my walk & Talk,my talk 3 in Geography

^

what does that sign mean?

for example:
2a^2 = 14^2 = 196
a^2 = 98
a = sqrt (98)=7 sqrt (2)
perimiter = 4 a = 28 sqrt (2) inches =
about 40 inches

2007-10-08 16:15:22 · 9 answers · asked by Anonymous in Mathematics

I have a lab report in which I have drawn a velocity/time graph...there is only one question I don't understand:
What was the MAGNITUDE of the ball's acceleration in this lab?
Can anyone just explain to me what exactly magnitude is and how you solve or describe it!

THANK YOU!!

2007-10-08 16:12:58 · 3 answers · asked by Captain Oblivious 6 in Physics

the compound X2O3 Is reduced by hydrogen according to the reaction: X2O3 + 3H2---------> 2X+3H20.

IF 9.30 g of X2O3 produce 3.64 g of h20, what is the element x?

2007-10-08 16:12:29 · 3 answers · asked by ccutestuff2001 2 in Chemistry

If I bought a telescope from walmart would it be good enough to give me a good view of astronauts doing a space walk? could I read the writings on the space shuttle with it?

2007-10-08 16:10:27 · 17 answers · asked by Anonymous in Astronomy & Space

PLSSSS

2007-10-08 16:07:16 · 3 answers · asked by disaztershobz 2 in Mathematics

the equation 2NA + 2H20---------> 2NAOH + H2. IF 7.2 grams of NA undergoes reaction with water and the resulting hydrogen is burned in oxygen to produce water, how many grams of water would be produce?


don't give me the answer please explain how to do it. i have seen other but i don't get an answer the professor provided. thanks!

2007-10-08 16:06:33 · 1 answers · asked by ccutestuff2001 2 in Chemistry

okayy theres a math bonus thing and i have no clue how to do it.
the problem says...What is the opposite of the reciprocal of the multiplicative inverse of the additive inverse of 5?

can someone explain how to do thiss?

2007-10-08 16:06:31 · 3 answers · asked by .michellee. 2 in Mathematics

The answer is [-7, infinity] Can you break down how to get this answer Thanks

2007-10-08 16:02:52 · 4 answers · asked by Anonymous in Mathematics

I am confused so bear with me. From what I understand I can look up an object’s Declination/Right Ascension and use this info to know where to look for that object in the sky. Is this correct?

If Mars is listed as being...Dec: 23degrees21min, RA: 06h02m
Can I use this to know where to look?

If its declination is 23 degrees this should be at the Zenith for anyone whose latitude is 23 degrees. Right?

Declination is directly related to latitude which seems pretty straight forward, but there is something about right ascension that I don't understand.

Where is RA measured from? I know it is measured eastward from the March Equinox, but how do I find where the March Equinox is?

And yes I deleted this question the first time. Sorry about that. I got so confused I had to scrap it and start from scratch……and Rev. Einstein I did read your response and appreciate your input.

2007-10-08 16:01:40 · 3 answers · asked by Anonymous in Astronomy & Space

2007-10-08 16:01:08 · 20 answers · asked by Anonymous in Mathematics

I live in the eastern US.

2007-10-08 16:00:57 · 4 answers · asked by gldnsilnc 6 in Zoology

The answer is [2,5] but how do you get that answer?????

2007-10-08 16:00:24 · 2 answers · asked by Anonymous in Mathematics

Is Darkmatter some kind of demon? Is there such thing as speed of darkness if there is speed of light? could it be the same speed? maybe there are two gods? --Help me with your opinion on this. if nothing registers in me, im gonna have to experiment this myself. and this could take me some time. coz Im really curious.

2007-10-08 15:59:39 · 12 answers · asked by quasar 2 in Astronomy & Space

2007-10-08 15:59:18 · 7 answers · asked by Anonymous in Medicine

ok so split china into 4 quarters. northwest northeast southwest and southeast. and what type of climates do each of them have?

2007-10-08 15:58:00 · 1 answers · asked by Anonymous in Weather

Chemistry.....Help!!!?
I can't figure this dang thing out:

Assume the reaction of 51.47 g of Ge in the following reaction to determine the other quantities.

3Ge + 2N2 -> 1Ge3N4
moles of Ge reacting =
moles of N2 required =
moles of Ge3N4 formed =
mass of Ge3N4 formed =

I have ge and n2 as .71 and .47, which are correct, but I can't seem to figure out that last two. Please help!!!

2007-10-08 15:57:52 · 2 answers · asked by Anonymous in Chemistry

I was given a graph of force vs time. I was also given the mass of an object, kinetic and static friction coefficients. The question asks for the velocity of the object at certain times. i'm not sure how to incorporate the friction coefficients in. Can anyone help?

2007-10-08 15:57:03 · 1 answers · asked by stud muffin 2 in Physics

it says to graph the equation..
nd they give you lyk

g(x)=[[3x]]+4
it says u can use calc
but teacher said she wants us to do it by hand
and i have no clue ><
any ideas?

2007-10-08 15:55:05 · 5 answers · asked by Anonymous in Mathematics

a) has it already reached maximum height? Explain your answer
B)what is its kinetic energy at maximum height if the mass of the projectile is 2kg?

2007-10-08 15:53:25 · 1 answers · asked by Lim B 1 in Physics

anyone know how to get the derivative of cos 2x - 5cos^2 X?

Here are some choices.
1. -6cos2x
2. 3sin2x
3.6cos2x
4.6sin2x
5.3cos2x

2007-10-08 15:53:23 · 4 answers · asked by Lil j 1 in Mathematics

I feel like this is not possible.

2007-10-08 15:53:05 · 6 answers · asked by mar_c601 2 in Mathematics

A committee of 5 people must be formed from a group consisting of 8 people. How many different ways can be we form this committee?

my answer is
8p5= 6720.
Wrong answer!

I dont know the right answer yet, please help me!

2007-10-08 15:51:09 · 3 answers · asked by solvia k 2 in Mathematics

I can't decide what I want to do with my civil engineering degree when I get out of school... As far as I know I can go into design, or I can go into something like field work or construction management. As far as I see, there is more money in design, but I think I'd enjoy being out doors on projects more. I would like the design to, but just not as much. Does anyone have any opinion on this situation...is there money in managing out in the field?

2007-10-08 15:48:59 · 3 answers · asked by Andrew N 2 in Engineering