Physics - April 2007

I noticed I can hold a object such as a pen in my hand and move my hand in all 3 dimensions, BUT the pen is still facing up the entire time. I have to rotate the pen in order for it not to face up, but I can rotate it without using any of the other 3 dimensions becuase my hand doesn't move along any axis it only rotates.

2007-04-15 17:06:26 · 4 answers · asked by jayguy5000 1

2007-04-15 16:57:53 · 3 answers · asked by Anonymous

How long until we have working fusion reactors and what are the main problems holding back development?

2007-04-15 16:33:15 · 6 answers · asked by Anonymous

In the nerve conduction velocity experiment, if any of the nerves used were reversed in their placement on the stimulating

2007-04-15 16:21:29 · 1 answers · asked by igor a 1

The distance of the Earth from the sun is 93 000 000 miles. If there are 3.15 × 10^7 s in one year, find the
speed of the Earth in its orbit about the sun.

2007-04-15 15:39:51 · 4 answers · asked by Anonymous

Suppose you wanted to be able to adjust the brightness of a light bulb in a lamp. Describe one way that you might be able to do this. If possible, don't recommend dimmers and light switches. Just describe what happens. (Grade 9 Physics)

2007-04-15 15:33:16 · 5 answers · asked by ¤Elva¤ 4

The northern lights are the result of high energy particles coming from the sun striking atoms high in Earth's atmosphere. If you looked at the light through a spectrometer, would you expect to see a continuous or line spectrum? Explain.
Thanks :)

2007-04-15 15:23:00 · 1 answers · asked by Anonymous

Consider a charged metallic spherical shell of radius a=1.75cm. The potential at distance of r=6 cm from the center of teh shell is measured to be 1.5kV. What is the charge on the shell? Calculate the potential on the surface of the shell.

Can I just use the equation V=KQ/r or is there more to that?

2007-04-15 15:20:59 · 1 answers · asked by Puzzled 3

I am trying to learn how to solve the following problem. Thanks for your help:

If a rolling ball has an initial velocity of -1.5 m/s and a constant acceleration of -0.23m/s^2 what is the average velocity after 2.2s?

Thanks for your help. Serious answers only, I am trying to learn how to do this from a book that is not real clear.

2007-04-15 15:02:25 · 4 answers · asked by rcpaden 5

A light wave has a 670 nm wavelength in air. Its wavelength in a transparent solid is 420 nm.

2007-04-15 14:56:18 · 4 answers · asked by RhondaJo 2

Im wondering which is faster, a Railgun or a Coilgun, or perhaps there is another sort of gun that can perform faster. Overall, i am just wondering what can get an object from point A to point B the fastest.

2007-04-15 14:51:45 · 3 answers · asked by Anonymous

2007-04-15 14:33:30 · 4 answers · asked by Anonymous

2007-04-15 14:27:24 · 1 answers · asked by Amber B 1

2007-04-15 14:24:30 · 3 answers · asked by Amber B 1

2007-04-15 14:23:45 · 3 answers · asked by Amber B 1

2007-04-15 14:23:26 · 1 answers · asked by Amber B 1

2007-04-15 14:22:53 · 2 answers · asked by Amber B 1

Keep it simple. I am making a simple Java game where you fire a cannonball at a target. I wanted to add air resistance and wind. I got the wind part down but I don't know about air resistance.

2007-04-15 13:39:59 · 3 answers · asked by Anonymous

why can't they be the shape regular light bulbs are?

2007-04-15 13:31:33 · 2 answers · asked by hlg567 3

Hi,
I am building a simulation. I need to figure out how to get V Final for two objects, given V initial and Mass for each. They are all circles.
How do you solve for this situation? I know that they are circular so the impulse vector will be along the line through their centers.
I'm not sure how to use this. There are 4 unknowns , but only 3 equations (conservation of energy, momentum for each direction)

2007-04-15 13:09:31 · 3 answers · asked by Randome 1

2007-04-15 12:26:58 · 2 answers · asked by wayne 2

A small block with mass 0.300 kg is attached to a string passing through a hole in a frictionless, horizontal surface. The block is originally revolving in a circle with a radius of 0.750 m about the hole with a tangential speed of 4.50 m/s. The string is then pulled slowly from below, shortening the radius of the circle in which the block revolves. The breaking strength of the string is 30.0 N.

What is the radius of the circle when the string breaks?

Thank you in advance!

2007-04-15 12:01:17 · 1 answers · asked by Anonymous

Given: A circular shaped object with an inner radius of 15 cm and an outer radius of 29 cm. There are three forces (acting perpendicular to the axis of rotation) whose magnitudes are
12 N, 24 N, and 13 N acting on the object. The force of magnitude 24 N is 25degree below horizontal.

Find the magnitude of the net torque on the wheel about the axle through the center of the object. Answer in units of Nm.

2007-04-15 11:38:37 · 2 answers · asked by p.b 1

The motor is barely 2 inches should I use more lemons?

2007-04-15 11:14:51 · 4 answers · asked by nickfly 2

I have a formula that I would like to find the propagated error from: n = (c) (p x a^2)/v, c= constant, and p, a, and v are variables.
This is generalized to the form:
X = c (A x B^2)/C, where c = constant, and A,B,C are variables
I know c, A, B, C, delta A, B, C, X, and delta X; so I basically know all the variables in this problem. How would I go about finding the propagated error?
Wikipedia gives:
If X = c(A*B)/C, where c is constant and A, B, C are variables
((DX)/X)^2 = (DA/A)^2 + (DB/B)^2 + (DC/C)^2
But I have a B^2 term in there; how would I go about finding the error?

2007-04-15 11:02:26 · 1 answers · asked by J Z 4

Do darker colors make an ice cube melt faster?
Or do lighter colors make an ice cube melt faster?

2007-04-15 10:40:21 · 10 answers · asked by Sara.faye. 2

2007-04-15 10:01:09 · 9 answers · asked by Anonymous

I need lab report abt da coefficient of friction of wood & wood Lik a complete report, if u did 1 before please send me one. I have one due tomorrow, and was busy with other work. If u know a internet link abt where i can find one plz send it. I need a complete report, not the stuff from google (which asks questions). PLEASE, just give me any lab report for coefficient of friction...ANYTHING! thank you

2007-04-15 08:54:41 · 4 answers · asked by Jubair 1

2007-04-15 08:40:35 · 9 answers · asked by paige.cawkwell@btopenworld.com 1

2007-04-15 08:38:42 · 2 answers · asked by paige.cawkwell@btopenworld.com 1