Physics - November 2006

2006-11-25 13:38:56 · 21 answers · asked by Tat 2

I have some ceramic powder which exhibit some very useful characteristics. I would like to know the size of these powder particles size which I believe is smaller than 100 nanometers. How to measure it? Are there any institutions who certifies nano technology?

2006-11-25 13:38:45 · 1 answers · asked by William X 1

Ok, obviously, we all know that you're gonna die if you fall in lava. BUT! my question is, what exactly happens to the body? do you die instantly? or does your flesh literally melt off your bones? any ideas?

FOR THE RECORD: I'm not sick and twisted, its just that i just watched LOTR, u know, return of the king, and Gollum fell in, so, u know, gears started turning.

2006-11-25 13:33:30 · 11 answers · asked by pharos91 3

Science students knows that the gravitational force of attraction between two objects is inversely proportinal to R*R(where R is the distance between them). But, if we have two concentric rings with different radii, there center of mass is is the same point. So, R=0 for them. Hence, the Gravitational forve of attarction should be infinite. But, in practice we can easily separate such rings. How/why?

2006-11-25 13:11:43 · 5 answers · asked by gp2much 2

I need to do 20 slides on "Conservation of Linear momentum." now if I am correct i shouldn't talk about elastic and inelastic collisions nor talk about impulse right? what theory should i talk about... I need help any resources anything would help. Any sources??

2006-11-25 13:08:31 · 2 answers · asked by avalentin911 2

http://www.wellnessgoods.com/messages.asp
This is some thing that I heard about a long time ago but couldn't find any more information on it. A friend ran across htis website inadvertently... It's totally worth checking out!

2006-11-25 12:30:28 · 4 answers · asked by sophia 4

My weight is 52 kg.

2006-11-25 11:34:54 · 5 answers · asked by Anonymous

A 67.0 g ice cube can slide without friction up and down a 31.0 slope. The ice cube is pressed against a spring at the bottom of the slope, compressing the spring 10.0cm . The spring constant is 26.0 N/m.

answer in cm.

2006-11-25 11:21:35 · 1 answers · asked by iknowu2jan 3

A 50.0 g projectile moves to the right with a speed of 2.00 m/s toward a 0.500 kg stationary and uniform 50.0 cm long thin rod pivoted at its center of mass wich is free to rotate about this frictionless pivot ( in the center). What is the linear speed of the ends of the rod if the projectile undergoes a totally inelastic collision with the very end of the rod? The rod is mounted horizantally and you may ignore any effects due to gravity.

2006-11-25 11:17:47 · 1 answers · asked by googoosh g 1

2006-11-25 10:50:31 · 2 answers · asked by rockubabe 1

On a triangle it says find the length of the midsegment it has a line across the triangle and at the bottom of triangle it has 324

2006-11-25 10:44:42 · 2 answers · asked by Greg E 1

It really sucks to think about that maybe we will never have commercial aircrafts to fly across any point on Earth at the speed of over Mach 1 because of sonic booms.

I am wandering is there any way that sonic booms can be reduced or avoided?

2006-11-25 10:44:03 · 4 answers · asked by Brad C 1

They say there is nothingl faster than light speed. What about thought? If you believe in telepathy (or mind reading, or projected thought), then you might consider if thought can travel faster than light. The scientific reasoning behind this concept of light speed having superior velocity doesn't even make sense to me either. Maybe somebody out there can explain it to me so I can understand it.

2006-11-25 09:54:57 · 13 answers · asked by Mickey Nation 3

2006-11-25 09:33:18 · 2 answers · asked by karl k 6

like, i can't just talk about black holes in general, it should be something more specific. Essay is 4000 words btw.

2006-11-25 09:32:32 · 8 answers · asked by Anonymous

2006-11-25 08:46:13 · 6 answers · asked by anks 3

2006-11-25 08:14:23 · 5 answers · asked by jrmerch1358 1

A 0.50m long guitar string, of a cross-sectional area 1.0x10^-6 m^2., has a youngs modulas of 2.0x10^-9 n/m^2. how much would you have to stretch the string to get a tension of 20 N?

2006-11-25 08:05:22 · 1 answers · asked by Trevor M 1

Centripetal force help anyone? I dont need a website i just want you to type out how you figured it out and the answer so here goes:

1.What is the centripetal force acting on an 1.5kg object moving in a circular path wiht a centripetal force of 18 m/s2?

2.A 100 g mass is attched to a string 75sm long and swings in a horizontal circle the mass goes around its path once ever .80 sec.
What is the centripetal acceleration of the object and calc the tension of the string

3. It takes a 900 kg racing car 12.3 seconds to travel at a uniform speed around a circular racetrack of 90 meteter radius
what is the centripetal acceleration of the car?
How much centripetal force is acting on the car?
What provides the centripetal force?

2006-11-25 07:56:15 · 3 answers · asked by xhbvi3tboix 3

2006-11-25 07:41:47 · 4 answers · asked by Marvin K 1

this is?

2006-11-25 07:24:02 · 7 answers · asked by mai n 1

A CD has a mass of 17 g and a radius of 6.0 cm. When inserted into a player, the CD starts from rest and accelerates to an angular velocity of 21 rad/s in 0.74 s. Assuming the CD is a uniform solid disk, determine the net torque acting on it.

2006-11-25 06:40:53 · 1 answers · asked by Hey Carl 1

A rotating door is made from four rectangular glass panes, as shown in the drawing. The mass of each pane is 75 kg. A person pushes on the outer edge of one pane with a force of F = 52 N that is directed perpendicular to the pane. Determine the magnitude of the door's angular acceleration.

2006-11-25 06:38:06 · 1 answers · asked by Hey Carl 1

A middle school student so how can I explain to an elementary kid on what determines wheter an object floats on water?

2006-11-25 06:37:19 · 6 answers · asked by Dead Man 1

I have been doing alot of experimenting at school with electricity, especially with the "Cold Fusion" process which to me is fascinating. I have wondered if an HV arc can be drawn underwater using a HV transformer (neon/flourescent light transformer) using around 9K of volts with 35 miliamperes.
As the anode and cathode I will use tungsten electrodes with
Thorium content.
Using a conductive base or solution (baking/bicarb soda I figure is safe) would help I presume. So, can it be done and if so, what would be the pros and cons.

Thank you in advance.

2006-11-25 06:26:59 · 4 answers · asked by Joseph C 1

Lenght=13cm,height=7cm,and depth=9cm

2006-11-25 06:12:19 · 3 answers · asked by Dead Man 1

Law of conservation of linear momentum is usually appplicable in an isolated system.Explain why under certain conditions this law is applicable even if the system is not completely isolated?

2006-11-25 06:01:46 · 4 answers · asked by hash 1

2006-11-25 05:53:26 · 5 answers · asked by hash 1

Two campers dock a canoe. One camper has a mass of 100.0 kg and moves forward at 3.0 m/s as he leaves the canoe to step onto the dock. With what speed do the canoe and other camper move if their combined mass is 175.0 kg?

2006-11-25 05:49:04 · 5 answers · asked by lindi 2

The quantity of momentum used with objects rotating about a fixed axis is called
a) torque
b) uniform circular motion
c) angular momentum
d) centriputal acceleration

2006-11-25 05:47:48 · 4 answers · asked by lindi 2