Science & Mathematics - 8 November 2007

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2007-11-08 18:39:09 · 4 answers · asked by Ant J 1 in Mathematics

2007-11-08 18:33:27 · 10 answers · asked by roxan a 1 in Zoology

Please, no Wikipedia. This I can check myself.

2007-11-08 18:32:53 · 10 answers · asked by cucumis_sativus 5 in Zoology

Q: Equation for each prabola.

focus (-4,-2)
Dicrectix x= -8

2007-11-08 18:24:07 · 2 answers · asked by Kennedy 1 in Mathematics

A stainless steel band (coefficient of linear expansion = 17.3 10-6°C-1; Young's modulus = 18 1010 N/m2) is placed around a tooth. It is essentially circular with an initial mean radius of 5.0 mm, a height of 3.6 mm, and a thickness of 0.46 mm. If the band just fits snugly over the tooth when heated to a temperature of 77°C, what is the tension in the band when it cools to a temperature of 37°C?
????N

2007-11-08 18:02:00 · 1 answers · asked by Ashley S 1 in Physics

2007-11-08 18:01:30 · 5 answers · asked by sheena k 1 in Zoology

Its actually what i want to know

2007-11-08 17:58:22 · 4 answers · asked by Rigo 2 in Biology

Her mass is 77.5kg.
The terminal speed is 54.5m/s.

2007-11-08 17:57:37 · 1 answers · asked by physics 1 in Physics

please show work if possible

1. how many squares of various sizes are in s six-by-six square?

2. find the sum of the reciprocals of the first five positive powers of three. express your answer as a common fraction

2007-11-08 17:47:47 · 3 answers · asked by Osamu Miyawaki 1 in Mathematics

soon,i will major in biomedical engineering..so i would like to know wether it is part of my studies..

2007-11-08 17:46:41 · 1 answers · asked by spider 2 in Engineering

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solve the system of equations

2007-11-08 17:46:16 · 4 answers · asked by Esther R 1 in Mathematics

1) r2-5r+6/r2-4 How would i simplify that
2) f(4) = 0 and f(6) = 6, which of the following could represent f(x) The answer is 3x-12, but i do not know y thats the answer.
3) This year, 75% of the graduating class of Harriet Tubman High School had taken at least 8 math courses. Of the remaining class members, 60% had taken 6 or 7 math
courses. What percent of the graduating class had taken fewer than 6 math courses?
4) In an arithmetic series, the terms of the series are equally spread out. For example, in
1 + 5 + 9 + 13 + 17, consecutive terms are 4 apart. If the first term in an arithmetic series is 3, the last term is 136, and the sum is 1,390, what are the first 3 terms?

5) Listed below are 5 functions, each denoted g(x) and each involving a real number constant
c > 1. If f (x) = 2x, which of these 5 functions yields the greatest value for f (g(x)), for all
x > 1 ?
A. g(x) = cx
B. g(x) = c/x
C. g(x) = x/c
D. g(x) = x – c
E. g(x) = logcx
Can u explain!

2007-11-08 17:25:50 · 5 answers · asked by bluesky777 1 in Mathematics

If there was a planet at a similar distance to earth, with the same orbiting period as earth, how would we have known? Can we see clearly in the movements of Venus, Mars and Earth itself, that this is not the case?

2007-11-08 17:24:41 · 19 answers · asked by kwaaikat 5 in Astronomy & Space

An object is located 3.5cm from the optical centre of a lens. The lens produces an image of magnification that is +0.667 the size of the object.

- Is this lens a diverging or a converging lens? Explain your answer.

- Find the position of the image and the focal length of the lens using the magnification equation and the thin lens equation.

2007-11-08 17:18:02 · 1 answers · asked by Anonymous in Physics

2007-11-08 17:16:03 · 11 answers · asked by adbfgav b 1 in Geography

A high diver leaves the end of a 5.0 m high diving board and strikes the water 1.4 s later, 2.2 m beyond the end of the board. Considering the diver as a particle, determine the following.
(
a) her initial velocity, v0
____ m/s ____° above the horizon

(b) the maximum height above the water reached
______ m
(c) the velocity vf with which she enters the water
_____ m/s _____° below the horizon

2007-11-08 17:09:17 · 3 answers · asked by sportmatic23 1 in Physics

Where do camels store water? i know it is not in their humps because they store fat in there. Anyone know?

2007-11-08 17:09:04 · 9 answers · asked by Anonymous in Zoology

Find the lengths of the hypotenuse and the altitude to the hypotenuse.

Please explain. Thanks a lot.

2007-11-08 17:07:50 · 4 answers · asked by Anonymous in Mathematics

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2007-11-08 17:07:21 · 1 answers · asked by Anonymous in Mathematics

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2007-11-08 17:04:06 · 1 answers · asked by Anonymous in Mathematics

2007-11-08 17:02:30 · 3 answers · asked by adbfgav b 1 in Geography

Explain please. Thank you.

2007-11-08 17:01:30 · 4 answers · asked by Anonymous in Mathematics

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2007-11-08 16:59:03 · 5 answers · asked by Anonymous in Mathematics

The bulk modulus for oil is 5.00 G Pa.

If you take 5.20 L of oil from the earth to Venus, where the surface pressure is 92.0 atmospheres, how much will its volume change, assuming that it is in a flexible (and hence compressible) container? (Ignore the temperature change.)

2007-11-08 16:51:47 · 2 answers · asked by ! 2 in Physics

A street lamp weighs 190 N. It is supported by two wires that form an angle of 140° with each other. The tensions in the wires are equal.
(a) What is the tension in each wire?
____ N
(b) If the angle between the wires is reduced to 110°, what is the tension in each wire?
_____N

2007-11-08 16:51:26 · 6 answers · asked by cutie 2 in Engineering

Reaction (1) to (4) can occur in the industrial conversion of ammonia into nitric acid.

Note: I would denote the oxidation number as ON:

Which one of these reactions shows the greatest change in the oxidation number of nitrogen?

(1) 4NH3 + 5O2 ---> 4NO + 6H2O
The ON of N in 4NH3 is -3, and the N in 4NO is +2, correct?

(2) 3NO2 + H2O ---> 2HNO3 + NO
The ON of N in 3NO2 is +4, the ON of N in 2HNO3 is +6 and the ON of N in NO is +2, correct?

(3) 2NO + O2 --> 2NO2
The ON of N in 2NO is +2 and the ON of N in 2NO2 is +4, correct?

(4) 4NH3 + 6NO --> 5N2 + 6H2O
The ON of N in 4NH3 is -3, the ON of N in 6NO is +2 and the ON of N in 5N2 is 0, correct?

however, my answer is (2) but the correct answer is (1)...please correct my mistakes from the above workings and show me your workings on how you calculate out that the greatest change in the oxidation number of nitrogen is in (1)..thanks

2007-11-08 16:41:29 · 1 answers · asked by Anonymous in Chemistry

A 3:25 g particle is moving at 1:51 m/s toward a stationary 7:89 g particle. (a)With what speed does the heavier parti-
cle approach the center of mass of the two particles? Answer in units of m/s.
(b)What is the magnitude of the momentum of the lighter particle, relative to the center of mass? Answer in units of Ns.

2007-11-08 16:39:35 · 2 answers · asked by Captain Jack is Back 1 in Physics

2007-11-08 16:38:03 · 21 answers · asked by yodude 1 in Astronomy & Space

A 0.016 kg marble sliding to the right at 20.9 cm/s on a frictionless surface makes an elastic head-on collision with a 0.016 kg marble moving to the left at 18.6 cm/s. After the
collision, the first marble moves to the left at 18.6 cm/s.
a) Find the velocity of the second marble after the collision. Answer in units of m/s.
b) What is the total kinetic energy before the collision? Answer in units of J.
c) What is the total kinetic energy after the collision? Answer in units of J.

2007-11-08 16:35:52 · 1 answers · asked by Captain Jack is Back 1 in Physics

Iron ores contain oxides such as iron(3) oxides (Fe2O3). IN a blast furnace, the iron ore is made into iron metal by heating it with carbon monoxide. Carbon Dioxide is the toher product. Write a balanced equation for this reaction. How much carbon monoxide is required to produce 504 gram of iron metal.( step by step guide please)

2007-11-08 16:35:20 · 2 answers · asked by Black Ninja12 3 in Chemistry