Physics - December 2006

if you have a hollow sphear with 100percent reflectav mirrors inside,a camora [coverd in 100pcr mirrors]that givs info to a screen without interfeering with the light also inside,what would you see if you introdused light into the sphear and it couldent escape?

2006-12-13 09:17:36 · 5 answers · asked by the professor 2

I mean, gas has mass so why isn't gravity dragging it to the ground?

2006-12-13 09:05:57 · 8 answers · asked by Anonymous

I know that when you spin an unboiled egg on a plate and put a finger on it to stop it, it will start spinning again if you let go of it. This is as the liquid inside it is still spinning. It rubs against the sides of the eggshell and causes it to spin again. I doubt this is possible with solid objects as nothing is moving inside them, but is the effect possible for objects with gas inside them, and could the effect be possible for plasma filled objects.

2006-12-13 08:33:57 · 7 answers · asked by Anonymous

2006-12-13 08:17:08 · 7 answers · asked by Aaron T 2

H/W question: Describe in terms of mass and weight the journey of a can of beans with a mass of 0.5kg from a shop in the north pole to a launch pad on the equator all the way to the moon.

This is my nephews science homework for tonight, I'm completely baffled!!! Can anyone help us out please??????! Thank You!

2006-12-13 08:02:45 · 5 answers · asked by Andie 2

it sais for each solid below draw the cross section formed when the plane indicated by the lines intersects the figure.... theres cubes cylinders cones triangular pyramids and prisms and rect pyramids!! HELP!!!!!!!!

2006-12-13 07:47:16 · 9 answers · asked by steelers_fan736 2

I took a very cold soda out of the freezer. It was completely liquid; no ice. As I opened the cap the top of the liquid froze and slowly the rest of the soda from top to bottom froze as well.

2006-12-13 07:29:10 · 6 answers · asked by Anonymous

2006-12-13 07:25:27 · 6 answers · asked by cjkaz 1

What is the equation that caculates the size somthing will be at certain gravitation pulls. For instance how do they know that on Jupiter we would only be about a foot tall becuase of gravity?

2006-12-13 07:14:21 · 3 answers · asked by matthias c 2

2006-12-13 07:04:53 · 7 answers · asked by habaceeba 3

sounds stupid but i want to settle a disagreement =

When you jump on a moving bus, do you land further back than where you left off because when you are in the air, the bus isnt moving you. so surely you should technically land in a different spot as the bus is moving underneath you.

I hope you understand what i mean.

2006-12-13 06:52:12 · 9 answers · asked by danny_9950 2

Conventional Newtonian calculations show that it will go up about 1000 metres before the velocity becomes zero and it starts to fall and that the time, before reaching the ground again, is around 3 secs. Such calculations ignore air resistance.

I have been in Greece when enthusiastic football fans have taken to the streets and emptied various firearms into the sky. I assume that air resistance will result in some limit to the missile velocity on return but surely not enough to make the thing safe?

2006-12-13 06:51:39 · 20 answers · asked by lykovetos 5

A skier has just begun skiing down a 30 degree slope. She is going at a constant speed. What is her coefficient of sliding friction?

(in the previous problem, the coefficient of sliding friction was .20 with an undetermined acceleration rate)

2006-12-13 06:37:22 · 6 answers · asked by The Answer 1

A skier has just begun schussing (skiing downhill without turning) down a 30 degree slope. The coefficient of sliding friction is .20. What is her acceleration rate?

2006-12-13 06:35:06 · 4 answers · asked by The Answer 1

a coffee cup on the dashboard of a car slides forward on the dash when the driver decelerates from 40 km/h to 0 in 3.5 seconds or less, but not if he takes a longer time. What is the coefficient of static friction between the cup and the dashboard?

2006-12-13 06:31:02 · 2 answers · asked by The Answer 1

450 loop circular armature coil with a diameter of 8cm rotates at 120 rev/s in a uniform magnetic field of strenght 0.55T. What is the rms voltage ouput? what would you do to the rotation frequency in order to double the rms voltage?

2006-12-13 06:18:00 · 2 answers · asked by sultan2377 1

2006-12-13 06:16:16 · 22 answers · asked by S.G. S 1

Scientists can determine either the location or velocity of a subatomic particle. However, both of these characteristics can not be known simultaneously. Why is this?

2006-12-13 06:06:43 · 7 answers · asked by fretzdawg 2

2006-12-13 06:06:09 · 14 answers · asked by Herbie 1

how effective would it be?

2006-12-13 06:00:17 · 1 answers · asked by catchup 3

the only problem is that the only college that i can get in to right now is a community college. i want a short vocational job so that i can support my way through the whole process of becoming a quantum physist. im training to be a bartender right now and should have a bartneding licence before the end of the year. i was thinking of working on a college campus so that way at least id be close to where the "action" is. another problem i find is that im not that good at math. i can understand the concepts extremly well but when it comes to actually doing the math on my own i get lost.
any advice would be of great help. i just feel i need a piont in the right direction so that i can start plainnng out my journey. thanks

2006-12-13 05:36:21 · 9 answers · asked by lostnkhaos 2

if you had a hollow sphere that was mirrored inside, completetly sealed whith a camera set on timer to flash would the light from the flash be in there forever and would you see it if you opend the sphere

2006-12-13 05:32:31 · 8 answers · asked by bumble 3

Give 3 examples in which friction is a hindrance (undesired)

2006-12-13 05:27:02 · 5 answers · asked by Fatima 1

First: In the early days of the internal combustion engine there were a few disatrous gasoline-delivery truck explsions. After these, gasoline-delivery trucks were equipped with chains that dragged on the road. What was the purpose of these chains?

Part 3-
Basically, we were using Coulomb's law and Cheerios or paper bits with a Van de Graaff generator.

Why do the Cheerios fly up when the Van de Graaff generator is turned on (they are placed on the dome)?

Part 5-
The wings of many airplanes are equipped with metal points that face back-ward. What is the purpose of these points?

Part 6-
Using a fluorescent lamp and a Van de Graaff generator.

1) Why does the fluorescent lamp glow when placed near the generator?

2) Why does the tube not glow as brightly when positioned tangential to the surface of the dome?

2006-12-13 05:26:49 · 2 answers · asked by Anonymous

There are diagrams to these question which I can not obviously post so can someone please tell me if the answers I chose SOUND right?
THE ANSWER IS THE LETTER OR LETTERS INDICATING EACH CHOICE THAT FORMS A CORRECT STATEMENT.

1-a crate rests on an inclined plane.
(a)the force exerted by the crate perpendicular to the plane is less than the weight of the crate.
(b)The plane exerts no force on the crate
(c)One component of the weight of the crte tends to cause the crate to slide down the plane
(d)The crate may weigh 500 kg.
My answer is B and C

2-a figure shows the components of the parallel wind forces acting on the sail of a boat.
(a)the forward component force is the desired one
(b)the sidewise component force tends to tip the boat
(c)the useful component force is greater than the undesired one
(d)more efficient use of the wind force would result if the boat turned and took a course 30 degrees to the right.
My answer is A, B, and D

THANKS

2006-12-13 05:14:27 · 3 answers · asked by Fatima 1

So we as humans see time as going in two directions, backwards (the past), and forwards (the future). We can only travel in one direction, and can only travel at one speed ("real time"). But what if there were infinite directions, like if I had a decision to make, what if the timeline split into two futures; one where I made said decision and one where i didn't. Now since there are infinite possibilities, maybe there is an infinite amount of timelines, and time travels in an infinite amount of directions, similar to height, width and length do.

Or I could be way off, your thoughts?

2006-12-13 05:11:16 · 7 answers · asked by Anonymous

2006-12-13 04:49:25 · 2 answers · asked by lmarchant17 1

2006-12-13 04:45:44 · 4 answers · asked by lilchoppacitychick 1

why the material of nicol prism can differentiate two plane polarised rays?

2006-12-13 04:42:27 · 10 answers · asked by divs 1

2006-12-13 04:35:22 · 3 answers · asked by sadf a 1