Science & Mathematics - 11 October 2006

A 7.50 kg block is resting on a horizontal surface, and is connected to a 5.50 kg mass suspended from a string passed over a frictionless pulley.
Find the acceleration of the system and the tension in the string if the surface is:
(a)
smooth, and
(b)
the coefficient of friction is 0.190

2006-10-11 09:23:22 · 2 answers · asked by helpmewithphysics 1 in Physics

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could someone help me with my science fair project i want to do something with bowling and win science fair?

i want to do this bc a family member of mine ownes a bowling alley and i could use her lanes and ball and wat not for free

2006-10-11 09:23:18 · 4 answers · asked by bball_plyr_11 2 in Other - Science

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algebra would likeanswers to the 5 questions?

1.5x2-3=6x 2.6x+3=5x2 3.8x=3x2+7 4.x2-3=-x 5.v2-30x=600

2006-10-11 09:22:26 · 3 answers · asked by barbaratt2002 1 in Mathematics

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What would happen if cells didnt have mitochondria. What is mitochondria?

Please help

2006-10-11 09:21:59 · 5 answers · asked by iloveyou (: 2 in Other - Science

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Science and medicine mathematical problem?

The equation h=-16t^2 + 112t gives the height of an arrow, shot upward from the ground with an initial velocity of 112 ft/s, where t is the time after the arrow leaves the ground. Find the time it takes for the arrow to reach a height of 180 ft.

2006-10-11 09:20:50 · 4 answers · asked by Anonymous in Mathematics

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Two numbers have a sum of39. Their difference is 11. What are the two numbers?

this is a math problem my child has can you answere it ?

2006-10-11 09:20:34 · 6 answers · asked by G'smom 1 in Mathematics

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physics question....?

A block weighing 80 lbs is on a 32.2 degree inclined plane.
(a)
What is the force parallel to the plane?
(b)
What is the acceleration if there is no friction?
(c)
What is the coefficient of friction if the object is just at the point of sliding?
(d)
Find the acceleration of the block if the coefficient of sliding friction is 0.280.

Any help is greatly appreciated....

2006-10-11 09:20:32 · 1 answers · asked by helpmewithphysics 1 in Physics

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What disease did cured bacon actually have?

2006-10-11 09:20:05 · 15 answers · asked by charlie a 2 in Biology

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what is the measure of each exterior angle of a regular hexagon?

a) 45degree
b) 60degree
c) 72degree
d) 120degree

2006-10-11 09:19:37 · 4 answers · asked by Anonymous in Mathematics

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what is the chemical name for BrO3-?

2006-10-11 09:19:33 · 4 answers · asked by Anonymous in Chemistry

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where can you find volcanic rock in orange county, california?

2006-10-11 09:18:53 · 4 answers · asked by em 1 in Earth Sciences & Geology

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How do you balance this equation?

NH3 + O2 = NO + H2O

2006-10-11 09:18:36 · 7 answers · asked by Kiko T 1 in Chemistry

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1 multiple choice question?

Ok.....they give you an initial velocity that a cannon ball is fired out of a cannon from and they give you a height for a cliff. They make you solve for time, horizontal distance, and final resultant velocity. They then ask, which of the following will be UNAFFECTED by a decrease in initial velocity.

Atime
Bhorizontal distance
Cfinal resultant velocity

I wasn't sure. I thought it was B, my friend said it's A and then I changed my mind but I'm still not completely sure...some people also said it's C, but for some reason I don't think it's C....any thoughts?

2006-10-11 09:17:31 · 8 answers · asked by Anonymous in Physics

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what is the second derivative of Ec+E1*sin^2(ka) with respect to k?

2006-10-11 09:16:50 · 1 answers · asked by NEU 1 in Mathematics

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anyone know what goes in earthquake safety kits?

its for a school project and anyone who knows somthing dont hold out i need some ideas

2006-10-11 09:16:05 · 2 answers · asked by Christian P. 1 in Weather

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Most things in nature work for the best chance of species survival , why are teenagers able to have babies?

It just seems counter productive for teenagers to be able to have children when they are at the most mentally confused time of a person's life. Why is this possible?
Could it be that we are really at our peak during our teenage years and society has caused this mental confusion?

2006-10-11 09:15:51 · 10 answers · asked by butnozzle 2 in Biology

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what year was the first bridge inven ted?

2006-10-11 09:14:46 · 4 answers · asked by yopopos 1 in Other - Science

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what goes up but doesnt come down?

2006-10-11 09:13:02 · 20 answers · asked by javionmachi 1 in Biology

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organic chemistry question?

substance x
use the IR to identify the functional group present.
use NMR spectrum to determine the positions of the protonts

pic of x
http://img423.imageshack.us/img423/1807/compoundxrb5.jpg

substance y
use the IR spectrum to determine the functional group
use the IR to determine the reletive molar mass and significant fragments

pic of y
http://images6.theimagehosting.com/compound y.th.jpg

2006-10-11 09:11:15 · 2 answers · asked by The d 1 in Chemistry

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If olive oil is made from olives and sunflower oil is made from sunflower seeds what is baby oil made from?

2006-10-11 09:10:46 · 15 answers · asked by charlie a 2 in Biology

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system of equations, using either substitution or elinmation?

how do i solve this equation ?
i get how 2 do the substitution and all but i cant solve this
its different the proble is:
f = 6 - 2g
1/6f + 1/3g = 1

do i just use that f or what ?

2006-10-11 09:10:26 · 10 answers · asked by Jan 2 in Mathematics