Physics - October 2006

2006-10-27 12:23:44 · 2 answers · asked by Dave R 1

2006-10-27 12:23:15 · 3 answers · asked by Hoang 1

A car accelerates from a standstill to 60 km/hr in 10.0 seconds. What is its acceleration?

A train is accelerating at a rate of 2.0 km/hr/s. If its initial velocity is 20km/hr, what is its velocity after 30 seconds?

Equation: a= vf-vi/ t a=velocity
vf= final velocity
vi=initial velociy
t=time

2006-10-27 12:09:10 · 3 answers · asked by Anonymous

A 15 kg block is at rest on a level floor. A 390 g glob of putty is thrown at the block such that it travels horizontally, hits the block, and sticks to it. The block and putty slide 15 cm along the floor. If the coefficient of sliding friction is 0.4, what is the initial speed of the putty?

2006-10-27 12:02:21 · 2 answers · asked by Dan L 1

this is a physics question.

2006-10-27 11:43:15 · 3 answers · asked by pr1nce$$ 1

Yes, it's a geeky physics joke...

2006-10-27 11:14:49 · 13 answers · asked by Anonymous

supposing the escalator itself didn't stop.

2006-10-27 11:09:38 · 10 answers · asked by eprefugee 3

2006-10-27 11:07:43 · 8 answers · asked by filotofo 1

Ok..say time travel is possible by increasing the velocity of my surrounding enviroment nearing the speed of light whereas time would speed up so essentially I would travel to a future time. Now say I bulid this geosphere/motion sphere or what have you...and I put my wife in the sphere agreeing that we will let the sphere spin for one hour. Wife gets in....I stand there and watch the sphere spin faster & faster till it nears the speed of light then continues for an hour thereof..all done then...now say our theories were sound and time has actually sped up for the wife and she has traveled .say...1 week into the future just for argument...now since wifey is a week in the future she shouldnt be in the sphere when I shut it off because after all...I won't be seeing her until a week has passed right?...Ok...so what happened when I shut off the sphere...did she disappear into the future?..will I see her in a week?..and how?..would be cool if a flash of light and out she popped 1 week later.

2006-10-27 10:22:04 · 13 answers · asked by Anonymous

2006-10-27 10:21:35 · 7 answers · asked by Strange Person 2

2006-10-27 10:16:29 · 7 answers · asked by AnnaQ 1

i need help with this question:

Atlas (the mythical god) is believed to hold the weight of the sky on his shoulders. IS Atlas performing any work (in terms of physics)?

Im assuming the answer is no...but im not 100% sure abt it...

THX..every1

2006-10-27 10:06:04 · 5 answers · asked by beautifuldisaster 2

There is a gun in which the barrel length is 62cm and has a muzzle velocity of 450m/s. A wooden chair of 30 kg sits on a wooden floor. A bullet of 10g penetrates the chair and the bullet lodges itself into the chair 9 centimeters. How far back, in centimeters, did the chair fly back? The coefficient of kinetic friction between the chair and the floor is 0.2

I'm not really sure how to approach this problem other than trying to use momentum conservation but do I need to find the force of the bullet on the chair to find the acceleration and then use momentum conservation to find the velocity, but i don't think that works. Any direction please?

2006-10-27 08:59:48 · 3 answers · asked by Bryan C 2

At a certain factory, 300 kg crates are dropped vertically from a packing machine onto a conveyor belt moving at 1.20 m/s. The coefficient of kinetic friction between the belt and each crate is 0.400. After a short time, slipping between the belt and the crate ceases, and the crate then moves along with the belt. For the period of time during which the crate is being brought to rest relative to the belt, calculate, for a coordinate system at rest in the factory, (a) the kinetic energy supplied to the crate, (b) the magnitude of the kinetic frictional force acting on the crate and (c) the energy supplied by the motor. (d) explain why answers (a) and (c) differ.

2006-10-27 08:10:23 · 2 answers · asked by afchica101 1

2006-10-27 08:02:38 · 2 answers · asked by ADS 1

2006-10-27 07:54:13 · 5 answers · asked by Lizzy B 1

A particle can slide along a track with elevated ends and a flat central part. The flat part has length L=40 cm. The curved portions of the track are frictionless, but for the flat part the coefficient of kinetic friction is µk = 0.20. The particle is released from rest at point A, which is at height h = L/2. How far from the left edge of the flat part does the particle finally stop?

The answer is 20 cm but I don't know how to get this answer! Please Help!

2006-10-27 07:53:03 · 3 answers · asked by afchica101 1

What is the speed of sound?

2006-10-27 07:32:17 · 1 answers · asked by Anonymous

2006-10-27 07:21:45 · 9 answers · asked by nima m 1

I hheard some mumbo jumbo that its an optical illusion bt i want 2 hear opinions.

2006-10-27 07:20:59 · 20 answers · asked by rubs c 2

Like a sun made with antimatter particles?

2006-10-27 07:15:35 · 3 answers · asked by izms 1

2006-10-27 06:49:26 · 14 answers · asked by twinsen110 4

Two solid spheres simultaneously start rolling (from rest) down an incline. One sphere has twice the radius and twice the mass of the other. Which sphere reaches the bottom of the incline first? Which has the greater speed there? Which has the greater kinetic energy at the bottom?

2006-10-27 06:48:53 · 6 answers · asked by Pat M 1

A 1000kg cart is rolling to the right at 4.50m/s . A 90.0 kg man is standing on the right end of the cart.What is the speed of the cart if the man suddenly starts running to the left with a speed of 7.00m/s relative to the cart?


I not really sure how to involve relative motion into this momentum problem. Any help?

2006-10-27 06:47:43 · 1 answers · asked by Bryan C 2

2006-10-27 06:42:30 · 21 answers · asked by nakerhaker 1

If a bullet is shot in the air at a ceremony what distance does it travel,before coming down?

2006-10-27 06:36:57 · 7 answers · asked by Anonymous

An article on Yahoo's home page concerning the existence of ghosts. Some physicist says that Ghosts cannot exist because they break the laws of physics.(They violate Newton's law of action and reaction.) But, I always thought that ghosts were in another dimension. If ghosts are in another dimension how do we know that their(ghosts) laws of physics are the same as ours?? If ghosts are in a different Universe than ours, then our laws of physics might not apply to them. Make sense?? Plus ghosts are energy right?? Some people say electrical in nature. Maybe the fact that they have electrical qualities might explain how they can react in our universe. That is just speculation though. Help me out with this one.

2006-10-27 06:35:00 · 12 answers · asked by MightyRighty 3

Have you been using Wikipedia for a long time? If yes, did you find the information there 100% accurate? Where can I go to find more accurate information on semiconductors?

Thanks

2006-10-27 06:32:43 · 14 answers · asked by gymnopedia 1

The length of each of the bonds between the atoms of a molecule of nitrogen (N2) is
0.0976 nm. The mass of a nitrogen atom is 2.32 x 10^11 pg.

Determine the moment of inertia of the molecule about an axis passing through the center of mass perpendicular to the line joining the two atoms. Ans. in units of pg nm^2.

2006-10-27 06:22:33 · 2 answers · asked by Anonymous

2006-10-27 06:16:36 · 26 answers · asked by Denis B 1