Physics - December 2007

2007-12-28 10:45:11 · 4 answers · asked by Aint No Bugs On Me 4

A diver performing a double somersault spins at an angular speed of 4.0 $ rad/s precisely 0.50 s after leaving the platform. Assuming the diver begins with zero initial angular speed and accelerates at a constant rate, what is the diver’s angular acceleration during the double somersault?

2007-12-28 09:35:44 · 4 answers · asked by Qasim S 1

Because I know some bullets can penetrate over 3 feet of wood, but less than a foot of dirt? Why is this so if the dirt is a bunch of loose particles, whereas the wood is a single material? thanks!

2007-12-28 08:51:21 · 7 answers · asked by Anonymous

2007-12-28 08:22:06 · 5 answers · asked by Perpetua 2

The image of the blast? (Presumably, the sightline would be blocked at some point by the curvature of the planet.)
The sound?
Hot winds?
Falling debris?
Some other effect?

2007-12-28 08:17:32 · 9 answers · asked by Perpetua 2

Dry ice feels like its dry when you hold it. It gives off what looks like a steam from the dryness.

2007-12-28 07:47:47 · 6 answers · asked by elise f 1

Whenever I turn on the TV I see loads of documentaries by loons like David Icke and Bob Lazar who believe that UFOs are piloted by little green men, but are there actually any serious scientists who believe this?

Has any "real" scientist ever published a serious paper in a science journal supporting the belief that UFOs are alien spacecraft? Or even given a speech in support of the idea?

If so, I'd really like to know which issues. I'd even like to know if any of the have published a serious peer reviewed paper against the idea.

2007-12-28 06:54:41 · 13 answers · asked by Anonymous

2007-12-28 05:41:30 · 3 answers · asked by Anonymous

A.) A car is parked on a cliff overlooking the ocean on an incline that makes an angle of 16.0° below the horizontal. The negligent driver leaves the car in neutral, and the emergency brakes are defective. The car rolls from rest down the incline with a constant acceleration of 4.10 m/s^2 and travels 43 m to the edge of the cliff. The cliff is 37m above the ocean. The acceleration of gravity is 9.81 m/s^2.
How long is the car in the air? Answer in units of s.

B.) What is the car's position relative to the base of the cliff when the car lands in the ocean? Answer in units of m.

2007-12-28 05:39:33 · 1 answers · asked by Melissa 1

2007-12-28 05:39:30 · 1 answers · asked by Anonymous

......then out through the other side of the earth and then you jumped down it, would you fall straight through to the other side of the earth? Would gravity take over in the middle of the earth and you'd be floating?

2007-12-28 05:29:35 · 16 answers · asked by Tracie E 1

My father was in the Navy before they had radar. These big ships don't turn easily and the officers had to worry about worry about running into other ships. My dad taught me a trick about avoiding collisions.

Just using eyesight and knowing where the other ship was in relationship to their bow, how could they tell if they were on a potential collision course?

2007-12-28 04:52:04 · 3 answers · asked by Frst Grade Rocks! Ω 7

2007-12-28 04:01:26 · 14 answers · asked by Anonymous

How?...and why?

2007-12-28 03:54:02 · 4 answers · asked by ¿Spooky - Version 0.2? 3

When building frames become hurricane-proof, frame coverings will have a different structural application.
Kevlar and fire-proof materials will be able to be added to theses new frame coverings, as a composite material additive. Since the frames will already contain the structural aspects of current rigid-materialed panels that are used to assist the frames, will there be developed, cost-effective frame coverings that will address things like water-repellency, fire-resiliency, and so on?

2007-12-28 03:23:33 · 3 answers · asked by Anonymous

doesn't the existence of the Planck length and Planck area suggest the existence of absolute position?

2007-12-28 03:01:33 · 4 answers · asked by Felsen 3

The clerk pulls with a force of 194 N at an angle of 25.0° with the horizontal. The box has a mass of 35.4 kg, and the coefficient of kinetic friction between box and floor is 0.450. Find the acceleration of the box in m/s^2

2007-12-28 02:12:34 · 3 answers · asked by P 1

Theoretically assuming such a bomb could be developed how powerful would it be ?

2007-12-28 01:45:21 · 11 answers · asked by lucifer 2

can i say that all the conventional diodes are said to be avalanche diodes?

2007-12-28 01:24:33 · 3 answers · asked by Anonymous

Not Homework.

2007-12-28 00:21:35 · 11 answers · asked by Dovey 7

I have an older relative that still has many metal fillings in her teeth and she swears she can name the music on a radio that is turned off. Is she crazy?

2007-12-28 00:19:54 · 9 answers · asked by Dovey 7

how is einstein's theory of relativity similar to and different from galilean-newtonian relativity?

2007-12-27 23:47:25 · 7 answers · asked by Aly A 1

this one is related to physics so please do not term it with Rays or any other measure unit!!

2007-12-27 23:26:43 · 4 answers · asked by code p 1

so pls can u give me this derivation or atleast give me the link for this derivation, it would be a great help.

2007-12-27 23:08:34 · 1 answers · asked by transcendentalist 2

1kg=?ltr

2007-12-27 22:21:45 · 25 answers · asked by Anonymous

A standard laser pen, for example, has a circular beam about 1mm accross. What's the smallest diameter beam that's ever been created? And can we get any smaller?
I'm not thinking of any particular wavelength of light - it doesn't have to be a visible beam of light.

2007-12-27 22:02:51 · 10 answers · asked by Mark R 2

the formula

2007-12-27 21:06:01 · 5 answers · asked by Joshua 2

how does your whole house become cool?

2007-12-27 20:27:13 · 6 answers · asked by seung lvs yahsin 1

If the "many worlds" theory of quantum mechanics is proven to be true, will we be able to use quantum computers to communicate with people in parallel universes?

2007-12-27 19:34:47 · 6 answers · asked by Bill Cousert 2

2007-12-27 19:33:50 · 5 answers · asked by Anonymous