Science & Mathematics - 2 December 2007

1.)Charles's law states that at a constant pressure,the volume of a fixed amount of gas varies directly with its temperature measured in degrees kelvin.A gas has a volume of 250 mL @ 300 degrees K.
write an equation for the relationship between volume and temperature.
2.)the amount of simple interest earned in a savings account varies directly with the amount of money in the savings account.you have $1000 in your savings account and earned $50 in simple interest .how much interest would you earn if you had $1500 in your savings account?

2007-12-02 12:11:38 · 6 answers · asked by Anonymous in Mathematics

2007-12-02 12:11:26 · 5 answers · asked by Corey 1 in Mathematics

2007-12-02 12:10:40 · 5 answers · asked by emily d 1 in Mathematics

i found the derivative to be dy/dx = - (2x + 2y)/(2x - 6y)
then i found the slope at that point to be equal to 1, which makes the slope of the normal -1
then i found the normal line to be y = -x + 2

do i set the curve equal to the line?
as in
x^2 + 2xy - 3y^2 = 0
and -y - x + 2 = 0
so
x^2 + 2xy - 3y^2 = -y - x + 2
i did this, then i tried to solve for y. i couldn't. i don't think i'm on the right track though.

so i guess, i'm not sure what to do after i get the normal line

2007-12-02 12:10:06 · 3 answers · asked by salmonella_jr 3 in Mathematics

Please give examples with numbers.

2007-12-02 12:09:14 · 25 answers · asked by ♥Ebonique♥ 2 in Mathematics

I need help with this math probem i cannot understand it:

Mia went downtown by bus, traveling at 60 km/h. She walked home at 6 km/h. Her total traveling time was 2.75 h. How far did she travel?

2007-12-02 12:09:14 · 11 answers · asked by |♥*/♥\*♥| 3 in Mathematics

Determine the derivative of x^2 -xy +y^2 =7.
I did 2x - [ydy/dx + x] + 2ydydx = 0 and I know thats where I made the mistake.

So basically, can someone show me what I'm doing wrong? Thanks :)

2007-12-02 12:07:02 · 5 answers · asked by Maike Tater 2 in Mathematics

2007-12-02 12:06:50 · 1 answers · asked by s 3 in Earth Sciences & Geology

Stephanie and Kaylee can finish apiece of work in 5 11/30 days. Stephanie can do the job herself in seven days. If Kaylee wanted to do the job alone, how long would it take her?
Answer :23 days

2007-12-02 12:06:20 · 5 answers · asked by janie 2 in Mathematics

Stephanie and Kaylee can finish apiece of work in 5 11/30 days. Stephanie can do the job herself in seven days. If Kaylee wanted to do the job alone, how long would it take her?
Answer :23 days

2007-12-02 12:04:12 · 1 answers · asked by janie 2 in Mathematics

5.00 x 10^21 formula units of nickel II sulfate


7.66 x 10^19 molecules of hydrogen peroxide

2007-12-02 12:03:15 · 3 answers · asked by ambie♥ 3 in Chemistry

When a hockey player shoots a slap-shot, is he using aerobic or anaerobic respiration to produce the energy used?

2007-12-02 12:02:41 · 3 answers · asked by cyber_caper 2 in Biology

I have to write a paper on this subject & I just need an idea of the whole question

2007-12-02 12:00:44 · 39 answers · asked by im_da_qween 1 in Mathematics

I really need help. The first one:

6e^-0.07x = e^0.02x

The second one:

30(1.05)^x = 15e^x



Easy 10 points!

2007-12-02 11:54:50 · 4 answers · asked by Anonymous in Mathematics

A woman stands on a platform (with a frictionless pivot), which is rotating with an angular speed of 5.20 rad/s. Her arms are outstretched, and the rotational inertia of the platform+woman system is 5.4 kg·m2. She then pulls her arms in, so that now the system's rotational inertia is 4.20 kg·m2.

What will be her new angular speed when she pulls her arms in?


I'm not sure how to approach this problem, please help!

2007-12-02 11:53:40 · 2 answers · asked by =P 6 in Physics

A clerk moves a box of cans down an aisle by pulling on a strap attached to the box. The clerk pulls with a force of 184.0 N at an angle of 30° with the horizontal. The box has a mass of 31 kg, and the coefficient of kinetic friction between the box and the floor is 0.45. Find the acceleration of the box.

AND

A 3.10 kg block is pushed along the ceiling with an constant applied force of F = 86.5 N that acts at an angle = 52° with the horizontal, as in the figure below. The block accelerates to the right at 6.02 m/s2. Determine the coefficient of kinetic friction between the block and the ceiling.

and

A 1.1 kg mass starts from rest and slides down an inclined plane 8.8 10-1 m long in 0.62 s. What net force is acting on the mass along the incline?

2007-12-02 11:53:10 · 1 answers · asked by Anonymous in Physics

Ice skaters use the conservation of angular momentum to produce high-speed spins when they bring their arms close to the rotation axis. Imagine a skater moves her arms inward, cutting the moment of inertia in half and therefore doubling the angular speed. If we consider the rotational kinetic energy, we see that the energy is doubled in this situation. Thus, angular momentum is conserved, but kinetic energy is not. Where does this extra energy come from?

2007-12-02 11:52:57 · 2 answers · asked by Mara F 2 in Physics

A rectangle is bounded by the x-axis and the semicircle y=sqrt(25 - x^2). What length and width should the rectangle have so that its area is a maximum?

2007-12-02 11:52:42 · 3 answers · asked by Anonymous in Mathematics

Given f(x) = 5x2 – 3x + 1, find f(–9).

2007-12-02 11:45:17 · 8 answers · asked by Anonymous in Mathematics

Write the equation of the line which has y-intercept
(0, -2) and is perpendicular to the line with equation y = –3x + 1.

2007-12-02 11:44:46 · 2 answers · asked by Anonymous in Mathematics

If the force of gravity between the sun and the planets suddenly disappeared, what type of path would the Earth follow?

2007-12-02 11:43:45 · 11 answers · asked by Chris C 2 in Astronomy & Space

A horiztonal force of 10 N is applied to a 1.0 kg block sitting on a flat surface. The coefficient of static friction between the block and the surface is 0.80, and the coefficient of kinetic friction is 0.70. Plot the velocity of the block as a function of time over the first five seconds. My question: how do you find the plot points?

2007-12-02 11:38:03 · 1 answers · asked by mathfan09 1 in Physics

i want to do psychiatry but struggle with science...

2007-12-02 11:37:23 · 12 answers · asked by Anonymous in Medicine

2007-12-02 11:34:36 · 2 answers · asked by Wendy G 1 in Mathematics

2007-12-02 11:33:28 · 2 answers · asked by Anonymous in Mathematics

a. None of the tangent lines are vertical.
b. (0,0)
c. (0,1)
d. (1,0)

2007-12-02 11:32:09 · 3 answers · asked by terrycropper 1 in Mathematics

I was just wondering if we wrer going to have a snow day tomoro

2007-12-02 11:29:59 · 6 answers · asked by Alexus 2 in Weather

2007-12-02 11:29:46 · 3 answers · asked by Nikki M 2 in Earth Sciences & Geology

Please show me how to work this problem:
Give area of region bounded by F(x)=X^2 - 3, x=-2x and vertical line x= 2.
I worked the problem and I got 11/9. This is how I did the problem
Integrate (-2x - x^2-3) (limit -3 to 1) + integrate (-2x-x^2-3) (limit 1 to 2).

Please explain me my mistake and please go step by step.

thanks.

2007-12-02 11:25:31 · 3 answers · asked by Avi 1 in Mathematics

Colin invested $16,000, part at 7% and part at 5%. If the total interest at the end of the year is $920, how much did he invest at each rate?

2007-12-02 11:25:23 · 4 answers · asked by Superman 2 in Mathematics