Science & Mathematics - 28 August 2007

Okay, i just started college, and was forced to take Physics 2A in order to be able to take 1A later.

Now i am not new to Physics, i learned and loved the subject for an entire year and scored a 4 on the AP exam, so know that i am not an idiot who needs to start at base-level, my school just didnt care and made me take it anyway

so first day's homework assignment was easy, but i couldn't help but notice everything was in American units....

WHY?

Why use Empirical? it is pointless and useless, metric is easier to convert within it's own system, if you go on an international level and measure things in ft, you will get laughed at and to top it all off, Metric is not so confusing when it comes to weight and mass.

Does anyone know why my professor is teaching in Empirical?

Do all college professors teach Empirical?

2007-08-28 17:30:55 · 3 answers · asked by Jay 3 in Physics

Flask and stopper = 31.601g
Flask, stopper, and water = 60.735g
Density of water = .9973g/cm^3
Mass of water = 29.134g
Mass of filled flask = 60.735g
Mass of empty flask = 31.601g

D=m/v or v=m/d

Volume of water= volume of flask= 29.21 cm^3

Applications:
Mass of unidentified liquid= 56.796g – 31.601g = 25.195g

The volume of the liquid is the same as the volume of the flask, 25.195g is the mass of the unknown liquid.
Question1)What is the volume of the unknown liquid?
Question 2)What is the density of the unknown liquid in g/cm^3?

Additional info(to be applied to the following questions):
Flask, stopper, and metal = 99.323g
Flask, stopper, metal, and water = 12.827g
Mass of metal = 60.092g
Mass of water = 21.504g

The water’s volume is found based upon its density, as in 1 lb.

Question 3) What is the volume of water (in cm^3)?

Based upon the volume found in question 3:
Volume of the metal = volume of the flask – volume of the water
Volume metal = _____question #4______cm^3 - ______question #5________cm^3 =
______question #6______cm^3

After having found the density of the metal; using the equation in 1 lb.
Question #7: What is the density of the metal is g/cm^3?

2007-08-28 17:29:35 · 1 answers · asked by 1234567890 5 in Chemistry

I know that in Archimedes' principle, the buoyant force is equal to the weight of the fluid displaced by the object. Since the object will sink until it has displaced fluid equal to its weight, why isn't the principle that the bouyant force is equal to the weight of the object? Isn't this true:

weight of object = weight of displaced fluid = buoyant force?

2007-08-28 17:27:30 · 5 answers · asked by LaDeeDa 2 in Physics

hi, i understood these problems during class, but now that i'm doing the hw, i'm completely lost.

question 1: According to a rule-of-thumb, every five seconds between a lightning flash and the following thunder gives the distance of the storm in miles. Assuming that the flash of light arrives in essentially no time at all, estimate the speed of sound in m/s from this rule.

question 2: A horse canters away from its trainer in a straight line, moving 130 m away in 14.0s. It then turns abruptly and gallops halfway back in 4.8s. Calculate (a) its average speed and (b) its average velocity for the entire trip, using "away from the trainer" as the positive direction.

question 3: An airplane travels 2100 km at a speed of 800 km/h and then encounters a tailwind that boosts its speed to 1000 km/h for the next 1800 km. What was the average speed of the plane for this trip?

I already know the answers, but I need help figuring out to work the problems.

2007-08-28 17:25:32 · 1 answers · asked by kolipjh126 2 in Physics

Cu + AgNO3 -> Ag + Cu(NO3)2

As many steps as you can give would be great! My book is the worst and I know nothing about where or how to begin!
Thanks so much!

2007-08-28 17:19:34 · 3 answers · asked by Anonymous in Chemistry

I thought it was in Orion but when I look up the names of the stars in Orion I can't see it. What is the technical name of our sun?

2007-08-28 17:19:14 · 21 answers · asked by martina_ie 3 in Astronomy & Space

In a bicycle race, Lionel gives Robert a 500 m advantage. Also, Lionel agrees to start 15 min after Robert. IF Lionel bikes at 17 km/h and Robert at 14 km/h, how long will it take Lionel after he starts biking to overtake Robert?

2007-08-28 17:14:20 · 1 answers · asked by a 1 in Mathematics

2007-08-28 17:13:15 · 19 answers · asked by Anonymous in Mathematics

I understand it's the title of a Neil Young album. But I was thinking about the phrase "rust never sleeps" and wondered if it was literally true that the process of something rusting does not cease, if the materials involved in the process actually never cease to slowly continue forming what we refer to as rust. I know, weird quesiton....

2007-08-28 17:10:29 · 5 answers · asked by mersaulte 1 in Earth Sciences & Geology

Thanks for answering!!

2007-08-28 17:07:24 · 2 answers · asked by Anonymous in Astronomy & Space

I have to make a powerpoint presentation on a technical topic in my college so i want to know more about spring theory.Please forward the link.

2007-08-28 17:06:25 · 2 answers · asked by dude logic 1 in Engineering

Does any one know the website that shows major cities and capitals for the west region. or any geography websites??????? thanks...... : )

2007-08-28 17:05:12 · 3 answers · asked by ♥ 4 in Geography

An object is thrown vertically upward such that it has a speed of 25 m/s when it reaches two thirds of its maximum height above the launch point. Determine this maximum height.

Can someone please explain HOW to do this? I don't just want the answer. Is there an equation I need to use orr .. ? I've been trying to figure this out and can't seem to get a correct answer :(

Any help is greatly appreciated!

2007-08-28 17:04:39 · 4 answers · asked by music123 1 in Physics

Hi guys. Looking at the integral, I initially thought using partial fractions would make it a piece of cake, but obviously x^2+2x+4 cannot be factored. So, I completed the square, giving us int of (x+4)/[(x+1)^2+3]. This looks as if we should use trig sub... could someone please show me their method to integrate this function? I'm 99% sure I solved it COMPETELY wrong. Please help! Thank you =D

2007-08-28 16:56:39 · 3 answers · asked by Anonymous in Mathematics

2007-08-28 16:54:51 · 11 answers · asked by jrivera_e17 2 in Astronomy & Space

2007-08-28 16:53:16 · 6 answers · asked by Terra 6 in Medicine

We all know there're 50 of them but I recently did a survey and many had clue where Minnesota, Wisconsin, Iowa, Idaho, Wyoming, Rhode Island, Conneticutt are. Those were the states that which had the most wrong answers

2007-08-28 16:52:37 · 9 answers · asked by charles v 1 in Geography

find the missing coordinate and then plot the point of x=-2, r=15 and the point is in QII.

2007-08-28 16:52:33 · 2 answers · asked by Anonymous in Mathematics

I have Geometry and i don't get any of it.I take notes and pay attention but none of it helps me get better at taking tests and passing them.I study and it doesn't seem to help
angle bisetor problems with angles and degree's with the -->
__
CD = There is a test coming up and i have no clue how to do problems like that!
Are there any websites that you can put a problem in and it will explain step by Step on what to do? and how to solve it?
(i am not trying to just get the awnser)
I need to know how to solve them.
Thanks for your help.

2007-08-28 16:50:13 · 2 answers · asked by ♥breeeeee 4 in Mathematics

2007-08-28 16:49:52 · 2 answers · asked by Angie 2 in Geography

sketch a reasonable graph showing how the dependent variable is related to the independent variable for the following: the angle at which you have to look up to see the sun depends on the itme of day. make the domain extend for several days

i need help with this
the thing im most concerned about is how to do i make the domain/x-axis im thinking? extend for several days?
usually i just mark the axis 'time' and do it by the amount of time goes by (minutes,hours,the usual) ..

any help is super-appreciated !

2007-08-28 16:46:09 · 2 answers · asked by ailee 2 in Astronomy & Space

2007-08-28 16:46:02 · 6 answers · asked by Anonymous in Mathematics

How many feet are there in 2.1 miles, accurate anser gets 10 points!!!!!!!! :)

2007-08-28 16:42:29 · 4 answers · asked by Anonymous in Mathematics

for example
6x + 12 = 3y
3x + -6 = y
please tell me exactly how u solved this.

2007-08-28 16:42:00 · 3 answers · asked by victoria 1 in Mathematics

I was told after it stings/bites you, it will die soon after. But it always seems like the same one flying around and stinging everyone.

2007-08-28 16:37:13 · 6 answers · asked by pinkbunnyslippers0 3 in Zoology

how many meters are there in 25,321 cm?
100 cm=1 meter

2007-08-28 16:36:53 · 12 answers · asked by Anonymous in Mathematics

2007-08-28 16:34:27 · 5 answers · asked by Anonymous in Mathematics

X- ___2___
x^2-9
___________
__1___
x-3

This is a double fraction question, i'm sorry but i did my best with what is available on my keyboard. The top half of the fraction is X minus (another fraction) 2 over x to the second power minus nine. this is all over the bottom half of the larger fraction which is 1 over x-3. Help!

P.S. I know that simplying the bottom half of the top equation x to the 2nd power minus 9 would make (x-3)(x+3) would give a common demoniator. I am unsure of actions after that.

2007-08-28 16:33:30 · 2 answers · asked by DeliaS 1 in Mathematics

this is it:

The regular price of a blouse is $34.00 Find the amount of the discount and reduce prise if there is a discount of 30 %

2007-08-28 16:32:01 · 2 answers · asked by dromaister 2 in Mathematics

Do you think that the human kind would bring along the end of the Earth with their extinction? Or that the destruction of Earth (caused by human impact) would end the human race? Do you think the human kind would find another place in the universe to reside on before the destruction of the Earth? Or do you think that after billions of years after the extinction or being abandoned by the human kind due to lack of resources, the Earth would once again restore to its previous phase and heal the manmade scars with time. Then, would another species would come out for domination?

lol

2007-08-28 16:29:24 · 11 answers · asked by J 5 in Astronomy & Space