Science & Mathematics - 29 November 2007

Okay, after a small research I decided to but an Orion, 70mm, refractor (whatever that means). Is my first telescope. I haven't open it yet but it struck me the big "Made in China" sign on the box. Don't wanna sound biased but I was expected to be American made.

2007-11-29 04:18:38 · 16 answers · asked by krumenager 3 in Astronomy & Space

2007-11-29 04:16:20 · 6 answers · asked by battle_boy1000 1 in Weather

For intro physics level, the depth of a region of water is increased, the propagation speed of waves through this region increases. Is the frequency in this region changed? I know that frequency changes with changes in media, and that you still have the same water, but does changing depth constitute a change in the medium?

2007-11-29 04:15:48 · 4 answers · asked by CH 1 in Physics

a. It is the only line of latitude that is a great circle.
b. It is the same as the prime meridian.
c. It is a line of longitude.

2007-11-29 04:13:42 · 9 answers · asked by Anonymous in Geography

a. to the North Pole
b. to the geomagnetic north pole
c. to the South Pole

2007-11-29 04:12:48 · 4 answers · asked by Anonymous in Geography

2007-11-29 04:11:58 · 3 answers · asked by Anonymous in Engineering

2007-11-29 04:11:04 · 2 answers · asked by SAREK 3 in Engineering

If the ring is dropped into boiling water, what will be the change in the inner diameter of the ring?

2007-11-29 04:10:12 · 1 answers · asked by Pascal 4 in Physics

The following problems are to be written up in polished form, showing all relevant work.

2. A manufacturer purchases a key component used in the production of their product from two different suppliers. (They want to keep their flexibility by maintaining a relationship with both suppliers.) The cost for this key component from supplier A is $5.25 per unit. From supplier B, the component cost is $4.80 per unit. The manufacturer needs to 7500 units and has $37,350 available to make the purchases. Set up a system of equations to describe this situation. Solve the system of eqautions to find the solution.
3. On a sunny day, a building and its shadow form the sides of a right triangle. If the hypotenuse is 32 m long and the shadow is 24 m, how tall is the building?
4. An airplane leaves an airport and flies due west 120 miles and then 210 miles in the direction 220°30′. Assuming the earth is flat, how far is the plan from the airport at this time (to the nearest mile)? (Hint: draw a picture of this with north pointing up.)

2007-11-29 04:06:30 · 2 answers · asked by Nicole 4 in Mathematics

if the lengths of the sides of the triangle are integers, what is the shortest possible length of a side?

2007-11-29 04:01:54 · 4 answers · asked by Anonymous in Mathematics

true or false

2007-11-29 04:01:50 · 10 answers · asked by Anonymous in Physics

I have a test monday and Im having a lot of trouble....can you tell me whatever you can about the similarity of reactivity between alkenes and alkynes

2007-11-29 03:59:02 · 2 answers · asked by Me 3 in Chemistry

2007-11-29 03:55:09 · 7 answers · asked by Sweet Judy 7 in Zoology

I need 6 examples of Newton's 3 laws being shown in the movie

2007-11-29 03:47:47 · 2 answers · asked by S Z 2 in Physics

I'm really confused
A 48 inch piece of string is cut into 2 pieces. One piece is used to form a circle, while the other is used to form a equilateral triangle. How should the string be cut so that the sum of the area is a minimum.
Thanks for any help, I tried working it out for like an hour and can't get it right :S

2007-11-29 03:47:40 · 5 answers · asked by *SnowQueen* 3 in Mathematics

1 moles of an ideal gas at T =313K is cooled down in an isovolumetric process and as a consequence the pressure drops for a factor of 2.1. After that the gas expands in an isobaric process till the initial temperature T is reached. Calculate the amount of heat (in kJ) absorbed by the gas during the whole process.

2007-11-29 03:47:27 · 1 answers · asked by Anonymous in Physics

One mole of an ideal gas is heated for Δ T = 74 K in an isobaric process. During the process the gas absorbed Q = 1,689 J of heat. Calculate the change of its internal energy. Enter your answer in scientific notation with 3 sig. fig.

2007-11-29 03:46:55 · 1 answers · asked by Anonymous in Physics

Can this drug keflex be used to take care of upper respitory tract infections? What else it used for ?

2007-11-29 03:46:41 · 3 answers · asked by SPACEGUY 7 in Medicine

A m=5 kg weight is dropped from height h =1.9 m onto a cart containing sand , mass M= 29 kg, initially moving at horizontal speed v= 2.1 m/s. How much heat is released in the process ?

2007-11-29 03:46:23 · 1 answers · asked by Anonymous in Physics

Around 1660 s the thermometers in Florence, Italy, were made so that 50 oFl correspond to 44 oR (Rheomir scale) and 0 oFl = -15 oR. On the other hand , on the Rheomir scale water freezes at 0 oR and boils at 80 o R. Find the value of 74 oFl on the Celsius scale.

2007-11-29 03:45:12 · 1 answers · asked by Anonymous in Physics

2007-11-29 03:45:03 · 7 answers · asked by x j 1 in Mathematics

how are you supposed to find the answer?

2007-11-29 03:42:45 · 9 answers · asked by jen 2 in Mathematics

Could someone please help me step-by-step through this sort of problem? I'm having trouble wraping my head around it.

Here's an example:
A 0.35 M solution of an unknown weak base has a pOH of 5.75. Calculate the Kb.

2007-11-29 03:41:42 · 2 answers · asked by Anonymous in Chemistry

2007-11-29 03:37:59 · 5 answers · asked by FURIOUS 1 in Mathematics

HCl + CaCO3 ---->
HCl + NaHCO3---->
HCl + KHCO3---->
I guess I am confused, because I believe water should be a product. Is there more than two products in some of these equations? I am so confused.

2007-11-29 03:34:28 · 6 answers · asked by cdavis337 2 in Chemistry

How many air molecules are in a 12x12x10 ft room? Atmospheric pressure is 1 atm and room temperature is 20. C. Assume ideal behavior.

2007-11-29 03:33:42 · 1 answers · asked by princess_be 1 in Chemistry

What are 30 animals that sucks to survive?
Example: A cow sucks to get milk, what are others?

2007-11-29 03:32:26 · 2 answers · asked by acidload 1 in Zoology

2007-11-29 03:31:21 · 3 answers · asked by abluheron1 4 in Earth Sciences & Geology

Of course I know it is because there is nothing making it go back given that there is no wind and indeed the mosquito is flying relative to the cars velocity. Nevertheless when a person is travelling in a really fast car why do we tend to get sucked into the seat, I mean I know it is because of inertia, but still why doesnt the same principle apply to the mosquito and make it go to the back of the car?

2007-11-29 03:31:19 · 5 answers · asked by feelingtherain 2 in Physics

Given: C is on the perpendicular bisector of AB.
Prove: Triangle ADC=Triangle BDC

???

2007-11-29 03:28:48 · 2 answers · asked by heather 2 in Mathematics