Physics - June 2007

2007-06-29 08:13:10 · 8 answers · asked by attiqzafar 1

I cant help but notice that Ek = 1/2 MV2 looks a lot like E = MC2. Should I take it that at the speed of light that the energy of the object is only 1/2 kinetic? If so what is the other half? Does the object get hot or something?

2007-06-29 08:06:54 · 8 answers · asked by timssterling 4

when looking at an object that is really hot, you can see ripply waves rising from it, distorting the view beyond the hot object. what is that effect called?

2007-06-29 08:03:39 · 7 answers · asked by norbert 1

I have a force acting only tangentially on the outer edge of a freely spinning wheel. I know this creates a torque that will accelerate the wheel. But how does this force effect the pivot point or bearing at its centre? Is any of this force transmitted to the bearing and if so how? Thanks!!!

2007-06-29 08:01:01 · 3 answers · asked by john 1

2007-06-29 08:00:52 · 4 answers · asked by attiqzafar 1

Space and time are related through gravity and it is sure that gravity caused a decceleration of time as more mass was formed in the early universe. Are these rates necessarily uniform? And as more mass is converted to energy will this locally affect the change in rate of time and space (less mass = less gravity)?

2007-06-29 07:45:01 · 2 answers · asked by misoma5 7

if u were to drill a whole thorugh earth and jump in... would u fall right through where in the other side of the world you'll be falin upside down.... or at the earth's core would u be pushed back up?


if anyohter sugegstions please share

2007-06-29 07:44:45 · 4 answers · asked by Mayday Parade in da all time low 2

If an internal combustion engine is a "heat engine", why is the cooling effect of the cooling liquid limited by a thermostat? Surely the lower the coolant temperature (exit temperature), the more efficient the engine.

2007-06-29 07:28:54 · 2 answers · asked by Poor one 6

2007-06-29 07:26:07 · 13 answers · asked by sanjay a 1

i want the summary of theory of relativity..

2007-06-29 07:23:36 · 13 answers · asked by sanjay a 1

Why is the sky blue?

Is time travel possible?

If the universe is expanding, what is it expanding into?

LMAO!

2007-06-29 07:21:38 · 6 answers · asked by ? 5

I understand it is a vector around a source charge but what is the field itself composed of?

2007-06-29 07:16:24 · 13 answers · asked by Andrew H 2

Suppose two twins found themselves at a great distance apart, travelling twards each other at half the speed of light (which is an attainable speed), both starting this journey at the same age. Suppose they are far enough from any celestial body so that they can be considered as being equally affected by any gravitational pull. The question is, what does each brother see when passing the other brother (note that they never stop, nor do they collide - they simply pass by each other, with the crafts engines being set so that they maintain a constant speed in spite of the varying gravitational pull each craft exerts on the other, so that no acceleration or decelleration occurs). According to (what I understand of) special relativity, each brother should see the other as being older than himself, which is clearly impossible. Einstein has answered a simillar question, but that involved departing and returning to earth, which involves an acceleration, which explained this parradox.

2007-06-29 06:43:49 · 8 answers · asked by cefacialtfel 1

A mass of 0.129 kg hangs from a vertical spring in the lab room. You pull down on the mass and throw it vertically downward. The speed of the mass just after leaving your hand is 3.40 m/s.
a) While the mass moves downward a distance of 0.10 m, how much work was done on the mass by the Earth? Include the appropriate sign.
At the instant in part (a) when the mass has moved downward a distance of 0.10 m, the speed of the mass has decreased to 1.84 m/s. How much work was done on the mass by the spring? Include the appropriate sign.

2007-06-29 05:58:52 · 1 answers · asked by Ashley 2

2007-06-29 05:44:23 · 7 answers · asked by Anonymous

2007-06-29 05:18:42 · 13 answers · asked by ? 2

If your falling of a tall building will a plastic bag lower down the speed your falling at?

2007-06-29 04:35:32 · 9 answers · asked by Anonymous

There is a fact saying that nothn the universe may exceed the speed of light. But, is this not disproved by the fact that energy is simply matter which is traveling at the speed of light squared? I understand the equations do not technically mean this but then again wat is energy if not extremely velocified matter?

2007-06-29 04:30:11 · 8 answers · asked by Anonymous

How does the sun burn without oxygen?

2007-06-29 03:14:22 · 4 answers · asked by Queen 1

Outside the space shuttle, you and a friend pull on two ropes to dock a satellite whose mass is 1500 kg. The satellite is initially at position < 3.2, -1, 2.3 > m and has a speed of 3 m/s. You exert a force < -500, 470, -300 > N. When the satellite reaches the position < 6.2, 3.5, 3.8 > m, its speed is 3.06 m/s. How much work did your friend do?

2007-06-29 03:13:43 · 3 answers · asked by Ashley 2

What magnification would you need on an optical microscope to see a 5 micron diameter bubble?

2007-06-29 03:01:40 · 4 answers · asked by Rori S 1

I have to derive

B_helmholtz = (8 / 5*sqrt5) (mu_0*N*i / R)

from

B_x (X) = (mu_0 / 2) [NiR^2 / (R^2 + X^2)^3/2]

Now X = R/ 2 and - R/ 2

I'm thinking that you sub this (X) into B_x (X)

Any ideas?

2007-06-29 02:28:24 · 1 answers · asked by Anonymous

This is a stumper. If a can of compressed air is punctured and the escaping air blows to the right, the can will move to the left in a rocket-like fashion. Now consider a vacuum can that is punctured. The air blows in the left as it enters the can. After the vacuum is filled the can will:

a) be moving to the left
b) be moving to the right
c) not be moving

Choose only one answer. The person who can explain their reasoning and selects the correct answer will be selected for Best Answer and all the immortal glory which accompanies it! Good luck.

2007-06-29 02:07:18 · 7 answers · asked by ? 6

I need all the geniuses in the world to help me please!!!

2007-06-29 00:28:18 · 11 answers · asked by Anonymous

1. a train starts from rest and moves with a constant acceleration of 2 m per second square for half min. brakes r applied and the train comes to rest in 1 min.find a)total ditance moved by the train
b)the maximum speed attaines by the train

2.a stone is thrown vertically upwards. on its way up it passes point a with speed v and point b 3m higher than a speed v/2. calc. the speed v and maximum height reached by the stone above point b
3.a juggler juggles 5 balls with 2 hands.each ball rises 2 m above her hands. approx how many times per minute does each hand toss a ball.

2007-06-28 23:56:41 · 2 answers · asked by shubh 1

2007-06-28 23:42:59 · 6 answers · asked by saint 1

If time slows down for a person in a spacecraft moving quickly away from Earth, does it also slow down for a person staying still while the Earth moves quickly away from them?

2007-06-28 23:28:38 · 9 answers · asked by colin m 1

An extreme skier, starting from rest, coasts down a mountain that makes an angle 25.0° with the horizontal. The coefficient of kinetic friction between her skis and the snow is 0.200. She coasts for a distance of 10.2 m before coming to the edge of a cliff. Without slowing down, she skis off the cliff and lands downhill at a point whose vertical distance is 4.10 m below the edge. How fast is she going just before she lands?

2007-06-28 23:27:35 · 3 answers · asked by M&M 2

2007-06-28 23:03:15 · 17 answers · asked by Anonymous

Your sister,
Ginger

2007-06-28 22:21:10 · 5 answers · asked by Anonymous