Science & Mathematics - 18 November 2007

"During rush hour., Bill can drive 15 miles using the side roads in the same time that it takes to travel 10 miles on the freeway. If Bill's rate on the side roads is 8 mi/h faster than his rate on the freeway, find his rate on the side roads."

2007-11-18 10:20:13 · 1 answers · asked by Tonie M 1 in Mathematics

solve the equation
the 8 is little and lower a lil. sry i dont kno how to say it.

2007-11-18 10:19:20 · 7 answers · asked by dave h 1 in Mathematics

What was the hourly rate of temperature change?

2007-11-18 10:18:28 · 4 answers · asked by Tonie M 1 in Mathematics

Can someone tell me what the two column proof is for the Isosceles Triangle Theorem and if possible its converse?

2007-11-18 10:16:19 · 2 answers · asked by Anonymous in Mathematics

would you normally expect ∆H° to be positive or negative for a voltaic cell? Justify your answer.

can anyone please help me answer this question?
thanks

2007-11-18 10:15:19 · 1 answers · asked by abc 1 in Chemistry

Using the given bond energies (BE), calculate ΔHorxn for the reaction:
CH4(g) + Cl2(g) => CHCl3(g) + HCl(g) (not balanced)
Bond BE (kJ/mol) Bond BE (kJ/mol)
C-H 413 C-C 347
C=C 614 C-Cl 339
H-Cl 427 Cl-Cl 243

Answer = -330kj

How would I solve a question like this?

2007-11-18 10:14:17 · 3 answers · asked by Johnson H 2 in Chemistry

The directions are:

For the following, solve for the angle such that the angle is greater than 0 but less than 360 degrees.

1. sin of the angle= negative 1/2

Could someone please show me how to do this, with steps included

2007-11-18 10:13:36 · 3 answers · asked by middleeastconflict 2 in Mathematics

I was given an interoffice mailer with what looked like a bloodstain on it. The mailer sat on my desk at least a day before I touched it and noticed the stain. Is there any chance of catching HIV from this? What about anything else?

2007-11-18 10:12:09 · 1 answers · asked by Anonymous in Medicine

I know the answer is 3 or 4. Can someone please break this down in children terms on how I would be able to answer this question. Please show me steps so i could answer similar questions like this.

2007-11-18 10:10:55 · 2 answers · asked by Johnson H 2 in Chemistry

A contest is being held to find the lightest, smallest volume, simplest, and least expensive package to contain 1 gallon of water when it lands on a concrete sidewalk after being dropped off the roof of building? ( a drop of about 125 feet).
a. Describe the approach that you would follow to package the water. The water must be contained throughout the process and there must be a high probability that the package will not break when it lands on the concrete.

Your answer's highly appreciated

2007-11-18 10:10:43 · 5 answers · asked by Patrick 1 in Engineering

I mean, are there any special classes that I would have to take.

2007-11-18 10:10:29 · 2 answers · asked by Natasha 1 in Astronomy & Space

Calculate the voltage of the following cell:
Zn │ Zn^2+ (0.10M) ║ Cu^2+ (0.40M) │ Cu

can anyone please help me solve this problem? and show how it is done.
thank you

2007-11-18 10:10:21 · 1 answers · asked by abc 1 in Chemistry

A dilation has center (0, 0). Find the image of the point B (1, -1) for the scale factor of 3.

2007-11-18 10:09:37 · 3 answers · asked by zerokun4 1 in Mathematics

A cable that is 26 feet long goes from the ground to the top of a building and forms an angle of 48.7o with the wall of the building. How many feet tall is the building?

2007-11-18 10:09:32 · 4 answers · asked by Angel 1 in Engineering

The directions are:

For the following, solve for the angle such that the angle is greater than 0 but less than 360 degrees.

1. sin of the angle= negative 1/2

Could someone please show me how to do this, with steps included

2007-11-18 10:08:57 · 8 answers · asked by middleeastconflict 2 in Mathematics

2007-11-18 10:08:05 · 32 answers · asked by Anonymous in Physics

2007-11-18 10:07:35 · 6 answers · asked by ? 2 in Other - Science

What is the new temperature in degrees Celcius?? Please explain steps---Thank YOu

2007-11-18 10:05:43 · 1 answers · asked by sarah 2 in Chemistry

...........

2007-11-18 10:05:10 · 8 answers · asked by Anonymous in Mathematics

(-3, 4) is reflected over the y-axis. What are the coordinates of the image?

2007-11-18 10:03:39 · 12 answers · asked by zerokun4 1 in Mathematics

2007-11-18 10:03:37 · 3 answers · asked by Anonymous in Physics

Find the derivative.

(sin(5x))^10

Could you also explain how you got your answer? Thanks!

2007-11-18 10:03:37 · 8 answers · asked by Karina C. 2 in Mathematics

What is the derivative of

y= square root of tan5x

Thanks.

2007-11-18 10:02:38 · 2 answers · asked by oriolesfan2323 4 in Mathematics

Equation: y -9=12
Please its for my little sister and she doesnt understand my way of doing it.

2007-11-18 10:02:05 · 23 answers · asked by Carolina L 1 in Mathematics

The question is that there is a frictionless incline and the angle of inclination is 20 degrees, and the spring constant is 331N/m and the mass of the block is 7 kg. The block is released from rest with the spring initially unstretched and the acceleration of gravity is 9.80 m/s^2. I tried to draw a picture so it would look like an acute triangle and a rectangle put together and the block would be on the part of the acute triangle and there would have to be a pulley where the acute triangle and rectangle meet. So I think I have to find the distance between where the acute triangle and rectangle meet to the distance where the block traveled. How can I find how far it travels down the incline before coming to rest and is my diagram okay?

2007-11-18 10:01:09 · 1 answers · asked by KE 1 in Physics

What is thunder?

2007-11-18 10:00:51 · 6 answers · asked by Anonymous in Weather

On october 7, you deposited $15 and then had a balance of $105 in your bank account. You had deposited $12 on October 5 and had withdrawn $25 on october 2. What was your bank balance on october 2 before your withdrawal?

2007-11-18 10:00:39 · 12 answers · asked by Anonymous in Mathematics

What's the antiderivative of xln(x) - x? What are you supposed to do with that first x! I don't know if it's even possible to do a reverse product rule...

2007-11-18 10:00:31 · 1 answers · asked by SarahC 2 in Mathematics

Often times there are large red, or yellow "spheres", or "balloons" on electric transmission lines. What are these objects, and what is there purpose?

2007-11-18 09:58:16 · 3 answers · asked by Robert B 1 in Physics

A 25 g bullet strikes and becomes embedded in a 1.55 kg block of wood placed on a horizontal surface just in front of the gun. If the coefficient of kinetic friction between the block and the surface is 0.45, and the impact drives the block a distance of 9.5 m before it comes to rest, what was the muzzle speed of the bullet?

__________m/s

2007-11-18 09:56:49 · 1 answers · asked by hayleym425 2 in Physics