Science & Mathematics - 16 December 2007

how do you know to use the uniform distribution and why is the distribution of U(-0.5,0.5) ?

In a laboratory, 48 measurements are taken and rounded off
to the nearest integer. Find the probability that the total error
introduced by rounding is no more than 2.

2007-12-16 05:32:43 · 1 answers · asked by Anonymous in Mathematics

I have been having trouble coming up with analogies for a cell as if it were a Movie Theatre. Primarily because the information I was given on the subject minimally helps me understand how a cell could be like a Movie Theatre. Listed below are the specific cell parts I need to come up with analogies for. Any help will be greatly appreciated.

Plasma Membrane
Cytoskelton
Golgi Apparatus
Smooth Endoplasmic Reticulum
Rough Endoplasmic Reticulum
Mitochondria
Lysosomes
Cytoplasm
Ribosomes
Vacuoles
Nucleus

2007-12-16 05:31:50 · 3 answers · asked by Anonymous in Biology

on my homework they are asking me :
suppose you are standing in the aisle of a bus traveling along a straight road at 100km/h, and you hold a pencil stil above your head. Then relative to the bus, the velocity of the pencil is 0km/h, and relative to the road, the pencil has a horizontal velocity of :
(less than 100km/hr)
(100km/hr)
or (more than 100km/hr)

HELP!!!
please

2007-12-16 05:30:33 · 1 answers · asked by MiSh3lLi. 1 in Physics

Okay, so I live in Southeastern Michigan. We are having a huge snowstrom right now. There's about 10 inches of snow on the ground, and they're expecting another 3-4 by tomorrow morning. It is soooo windy, so there are a ton of snow drifts.
Do you think there's a good chance of me having a snow day tomorrow? If you need more weather info, go to a weather site and check the forecast for Ann Arbor, MI.
Thanks everyone!

2007-12-16 05:28:03 · 5 answers · asked by blue92 3 in Weather

A 15.6 kg block is dragged over a rough, horizontal surface by a constant force of 77.5N acting at an angle of 27.4 degrees above the horizontal. The block is displaced at 54.2m, and the coefficient of friction is 0.155. The acceleration of gravity = 9.81.

What is the magnitude of the workd done by the force of friction. Answer in joules.

2007-12-16 05:26:24 · 3 answers · asked by alex s 1 in Physics

3
2
7
5
8
4

2007-12-16 05:26:15 · 4 answers · asked by Anonymous in Chemistry

1) a string under a tension of 74 N is used to whirl a rock in a horizontal circle of radius 3.4 m at a speed of 26.79 m/s. The string is pulled in and the speed of the rock increases. When the string is 0.627 m long and the speed of the rock is 55.4 m/s, the string breaks.
What is the breaking strength of the string?
Answer in units of N

2) A merry-go-round makes one complete revolution in 16.4 s. A 35.7 kg child sits on the horizontal floor of the merry-go-round 5.52 m from the center
The acceleration of gravity is 9.8 m/s/s
What minimum coefficient of static friction is necessary to keep the child from slipping?

2007-12-16 05:26:04 · 2 answers · asked by Anonymous in Physics

2007-12-16 05:25:37 · 10 answers · asked by pualani06 1 in Astronomy & Space

How much work is required to pull the skier 60.4 m up a 31.0 degree slope (assumed to be frictionless) at a constant speed of 2.0 m/s? The acceleration of gravity is 9.8 m/s^2. Answer in units of J.

2007-12-16 05:24:24 · 1 answers · asked by Anonymous in Physics

im so confused with my homework !
How is it that
sec( - theta) = - csc theta ? ? ?
and how does
cot ( pi + pi/4) = 1??
i am really confused!! can anyone help??

2007-12-16 05:22:07 · 6 answers · asked by Anonymous in Mathematics

2007-12-16 05:21:52 · 6 answers · asked by Anonymous in Engineering

2007-12-16 05:19:16 · 4 answers · asked by Anonymous in Mathematics

degrees above the horizontal. The block is displaced 97.8 m, and the coefficient of kinetic friction is 0.142. The acceleration of gravity is 9.8m/s^2. find the magnitude of the work done by the force of friction. Answer in hte units of J.

2007-12-16 05:19:12 · 2 answers · asked by Anonymous in Physics

its for my math homework and im stuck, please help

2007-12-16 05:19:00 · 5 answers · asked by Anonymous in Mathematics

I want to purchase a hands free magnifier such as Optiviewer or Magniviewer and they are described as 6", 8", 12" with a related diopter number. How do I select one of these?

2007-12-16 05:12:57 · 2 answers · asked by Jack W 1 in Mathematics

4q(3p^2-5q)(3p^2+5q)
The numbers after the "^" are powers.

I got the answer 36qp^3-100q^3

2007-12-16 05:12:00 · 5 answers · asked by Anonymous in Mathematics

What is the absolute value of 0/2

2007-12-16 05:11:34 · 4 answers · asked by Fel 2 in Mathematics

I once woke up with the feeling that someone was watching me and when I turned to look around my room I saw a woman with red hair in curlers standing just outside my door frame staring at me. At first I thought it was my mom, so I called to her twice before I realised that her hair was red and my mom's hair is brown. I blinked and she was gone, but I still felt like I was being watched....and my mom hadn't been wearing curler for at least 2 years when I saw this woman.

2007-12-16 05:11:04 · 12 answers · asked by Anonymous in Paranormal Phenomena

2007-12-16 05:06:38 · 8 answers · asked by Anonymous in Physics

1. Name two animal phyla whose members show segmentation.
2. What is one advantage of the multichambered heart that is found in some vertebrates?
3. Name one advantage and one disadvantage of being a hermaphrodite.
4. List three characteristics that insects share with other members of the subphylum myriapoda.
5. List two differences between insects and other members of the subphylum myriapoda.
6. The ventral muscles of the belly are more developed in amphibians than they are in fishes. Explain why?
7. Female mosquitoes feed on blood, while male mosquitoes feed on plant sap or nectar. How is this difference in feeding behavior important for the reproductive success of mosquitoes?
8. Shrews are the smallest mammals, some weighing as little as 2 g(0.07oz). They also eat constantly and must hunt for food both day and night. Explain why shrews have such a voracious appetite.
9. What primates exhibit bipedalism?

2007-12-16 05:06:00 · 1 answers · asked by Qwerty 2 in Biology

i am stuck with the follwoing question: floor is 2.4m by 1.6m. all the tiles are 20cm cquare. one layer of border tiles is placed around the edge. how many tiles are needed to fill in the middle?

2007-12-16 05:02:44 · 5 answers · asked by Tin T 2 in Mathematics

Hi there,
I'd like to ask for an explanation on finding positive and negative coterminal angles of both degrees and radians. For example, how would I find the two for something such as -230 degrees, or 23(pie)/6? Any helpful explanations will be greatly appreciated. Thanks!

2007-12-16 04:59:22 · 4 answers · asked by Quasar 2 in Mathematics

"Ask Marilyn"

2007-12-16 04:56:40 · 2 answers · asked by jimmymae2000 7 in Mathematics

How would you explain it easy English so every one would understand ?

2007-12-16 04:53:32 · 9 answers · asked by T C 1 in Engineering

do aliens love?

2007-12-16 04:51:22 · 14 answers · asked by Anonymous in Astronomy & Space

and hit Evette Fielding in the bum so that it hurts, then why is it they need Evette Fielding's help to move a little glass on a slippery flat ouija board?

2007-12-16 04:50:01 · 8 answers · asked by Anonymous in Other - Alternative

Find the slope of any line perpendicular to the line through points (6, 3) and (7, 7).

2007-12-16 04:47:55 · 7 answers · asked by mrsstrick27 2 in Mathematics

Just wonderring....

2007-12-16 04:44:46 · 5 answers · asked by lil-yoel24 1 in Zoology

Your teacher challenges you and your best friend to each pull a pair of scales attached to the ends of a horizontal rope, in tug-of-war fashion, so that the readings on the scales will differ. Can this be done? Explain.

2007-12-16 04:44:39 · 2 answers · asked by Anonymous in Other - Science

It seems to be used to measure the quantity of Vitamin A in foods, but what is it equal to? Milligrams? Micrograms?

Also there seem to be TWO types of measurement for Vitamin A, one is IU, the other is "RAE". Why are there 2 different measurements, and what is RAE?

http://www.nal.usda.gov/fnic/foodcomp/cgi-bin/list_nut_edit.pl

2007-12-16 04:44:33 · 1 answers · asked by Chimera's Song 6 in Chemistry