Science & Mathematics - 3 December 2007

Find all values of t at which the particle changes direction. Justify your answer.

2007-12-03 16:28:21 · 1 answers · asked by help! 1 in Physics

I am the TA for the electric machines laboratory course at The Ohio State University.

One of the things I enjoy doing when I teach this lab is to bring in demonstrations of motors/gens or magnetism that have a certain "cool factor" (eg: an electromagnet that can lift 50lbs). I also like to give out "optional reading" links to websites with useful or practical information related to the course topics.

So, the type of website I am looking for is something that is pretty easy reading and contains primarily conceptual information. A website that has flash animations or GIFs that show concepts would be great as well.

I am looking for something like these sites:
http://my.execpc.com/~rhoadley/magindex.htm
http://www.wvic.com/how-gen-works.htm

Thanks!

2007-12-03 16:20:04 · 1 answers · asked by Ubi 5 in Engineering

I'm writing a book, and the main part takes place on a continent that is on the equator. I need to know what kinds of naturally occuring foods, and/or common plants are found. This is assuming the people on this continent have had no contact with other people and are literally isolated. So before Europeans brought over their stuff to Latin and Central America, what kind of things naturally grew on the land, than the people widly used?

2007-12-03 16:19:49 · 4 answers · asked by Max 4 in Agriculture

The instructions are construct rhombus RHOM with angle H and the side line segment RH. Can anyone help me?

2007-12-03 16:16:35 · 1 answers · asked by Anonymous in Mathematics

please help me with this problem, i'd like to know HOW to do this. please set this up for me!

Matthew is 3 times as old as Jenny. In 7 years, he will be twice as old as she will be the. How old is each now?

2007-12-03 16:14:09 · 10 answers · asked by tonetti@sbcglobal.net 2 in Mathematics

2007-12-03 16:11:39 · 5 answers · asked by lashel h 1 in Mathematics

Two objects are made from the same material. They have different masses and temperatures.

If they don't experience the same temperature change, which object will experience the greater temperature change?

Please provide sources of info...I don't want faulty information.

2007-12-03 16:07:11 · 7 answers · asked by triciawin87 2 in Physics

If i have an area of a circle A=(piD^2)/4 and i calculate 1/A=4/piD^2. Then what is uncertainty of 1/A? d(1/A)

Can someone please help me.

2007-12-03 16:04:05 · 1 answers · asked by I S 1 in Engineering

A 17 kg child descends a slide 3.5 m high and reaches the bottom with a speed of 1.5 m/s. How much thermal energy due to friction was generated in this process? in Joules

2007-12-03 16:03:47 · 3 answers · asked by joe s 1 in Physics

like the number of step it takes to complete one rotation

2007-12-03 16:03:02 · 5 answers · asked by Pradeep 1 in Engineering

A car traveling at 100 km/hr, stops in a distance of 70 m with constant acceleration. What is the magnitude of the acceleration? in meters per second squared

2007-12-03 16:01:43 · 3 answers · asked by joe s 1 in Physics

2007-12-03 15:59:02 · 4 answers · asked by Anonymous in Mathematics

2007-12-03 15:57:56 · 6 answers · asked by Anonymous in Mathematics

2007-12-03 15:56:31 · 8 answers · asked by Anonymous in Mathematics

2007-12-03 15:54:22 · 6 answers · asked by Anonymous in Mathematics

We have been studying this in school lately...
Your thoughts?

2007-12-03 15:51:58 · 4 answers · asked by Anonymous in Biology

Find the amount of heat required to change steam that is at 120 degrees celcuis to ice at 20 degrees celcuis. Can someone give me the formula to solve this problem?

2007-12-03 15:51:57 · 3 answers · asked by Momo 5 in Physics

I was raised on a cattle farm. Now that I am an adult and my grandfather is passed away I kinda want to get a few cows. Not many. I guess I'm asking, "What should I know?" How much on average does a cow cost including their veterinarian needs? How much should I buy them for and how much should I sell them for? I could never buy one for slaughter. Please help me out cattle farmers!

2007-12-03 15:50:07 · 4 answers · asked by zetty 2 in Agriculture

Please show how you came to the answer. Thanks!

2007-12-03 15:48:19 · 2 answers · asked by Sleepy S 1 in Mathematics

A race car driver must average 204.0 km/h over the course of a time trial lasting ten laps. If the first nine laps were done at 200.0 km/h, what average speed must be maintained for the last lap? (Answer to the nearest km/h.)


for all you math geniuses, its not 240 km/hr you have to manipulate the means or something

2007-12-03 15:38:04 · 7 answers · asked by gabriel_d_popuch 1 in Physics

2007-12-03 15:37:56 · 2 answers · asked by filmaddict24 2 in Astronomy & Space

i need it for a sci. project

2007-12-03 15:33:56 · 1 answers · asked by Anonymous in Physics

I need help solving it...what is the equation i use?!!

2007-12-03 15:33:52 · 1 answers · asked by texxas815 1 in Physics

Finf the radius of each circle with the given measurement....
A=289(pi)in squared

**Please show work and explain if possible! I have more problems like this one, and I don't want to have to refer to this website for more than one.**
Thank you in advance!

2007-12-03 15:30:44 · 4 answers · asked by dazed and confused 2 in Mathematics

why cant it be purple? i want purple grass.

2007-12-03 15:30:25 · 10 answers · asked by jdhahling 2 in Botany

2007-12-03 15:29:05 · 4 answers · asked by Anonymous in Medicine

365.25 days, the avg distance is 1.5 x 10^ 8 km and the Earth's mass is 6 x 10^24kg

2007-12-03 15:28:36 · 3 answers · asked by abbs 2 in Physics

I needed to determine the derivative of e^3x(cos4x+4sin4x)

so far i have

f'(x)= 3e^3x(cos4x+4sin4x) + e^3x(16cos4x-4sin4x)

How can i simplfy it so i end up with an answer of
f'(x)= e^3x(19cos4x+8sin4x)<--- this is the final answer...I need the steps in between!

2007-12-03 15:24:53 · 5 answers · asked by michelle 1 in Mathematics

Someone just mentioned about them and I wanted the rest of you to read about them ..just go to Wiki.Do you know any more about them? I'm just wondering how this name got started.Do you know?

2007-12-03 15:23:04 · 14 answers · asked by Deenie 6 in Paranormal Phenomena

2007-12-03 15:22:13 · 4 answers · asked by Miss Happy 1 in Mathematics