Physics - November 2006

Would this be true for an astronaut in orbit?

2006-11-02 06:41:27 · 9 answers · asked by whoknows 1

I know it depends a lot on the velocity and guage of the bullet being fired at it, but how think does steel have to be to become bulletproof?

2006-11-02 06:38:05 · 5 answers · asked by Brett R 2

2006-11-02 06:11:39 · 13 answers · asked by Anonymous

2006-11-02 06:07:59 · 15 answers · asked by Anonymous

2006-11-02 05:48:05 · 2 answers · asked by claudia 1

Two carts collide on a track. Cart B is stationary to begin with. The two carts stick to each other on impact. Cart A is moving at 29.9 m/s just before the collision, and the two sticking together have a speed of 16.8 m/s right after impact.
Compute and record the momentum of both carts before the collision, and the momentum of the combination after the collision. Cart A has a mass of 628 g; cart B has a mass of 641 g.
Now, calculate the kinetic energy before, and after the collision.
Determine what percentage of the energy was lost in the collision.
Are you able to explain your answers? Good luck!

2006-11-02 05:46:57 · 2 answers · asked by Anonymous

Who to calculate the angular diameters( in radians) of the sun and the moon, as seen on the earth?
When Elipses happen on the earth because of an amazing coincidence, how to calculate the angular diameters in radians of the sun and the moon, as seen on earth.
radus of earth is given= 6,96.10^5 km.
raduis of moon is given=1,74.10^3km

2006-11-02 05:40:46 · 2 answers · asked by nice_ girl 1

I need an example of something that weighs 1kg and my mind is blank right now.

2006-11-02 05:39:47 · 11 answers · asked by Anonymous

2006-11-02 05:32:53 · 6 answers · asked by claudia 1

2006-11-02 05:31:50 · 2 answers · asked by claudia 1

Cylindrical pulley w/ the following:
mass, M = 6.9 kg
radius, r = 0.811 m
moment of inertia 1/2 Mr^2

is used to lower a bucket (m=2.9 kg) into a well. The bucket starts from rest and falls for 3.3 s, acceleration of graviy is 9.8 m/s^2.

A) What is the linear acceleration of the falling bucket in units of m/s^2?

B) How far does it drop in units of m?

C) What is the angular acceleration of the cylinder in units of rad/s^2?

2006-11-02 04:58:29 · 1 answers · asked by Anonymous

if the kinetic energy of an arrow is doubled, by what factor has its speed inreased ?
if its speed is doubled, by what factor does its kinetic energy increase?

2006-11-02 04:57:26 · 6 answers · asked by nice_ girl 1

Heisenberg indicated that it cannot be done=who is right?

2006-11-02 04:45:19 · 2 answers · asked by goring 6

2006-11-02 04:41:38 · 7 answers · asked by navya 2

Why not use simple solutions?The best explanations are they not usually the simplest ones?

2006-11-02 04:37:51 · 6 answers · asked by goring 6

Why not a no Big Bang at all?Could there have been some other way of construction without blowing up things. why build with explosions. Usually you need activation energy to cause an explosion.

2006-11-02 04:33:10 · 2 answers · asked by goring 6

Does the 2nd law of thermodynamics explain disntegration?
So as energy dissipates where does it go,does it expand into outer nothing?

2006-11-02 04:07:25 · 1 answers · asked by goring 6

That stops a spinning disc from dropping flat, some years ago I was rolling a steel disc along it was one metre in dia and ten mil. thick when I wanted to put it down I leaned it a little and gave it a twist and it started to rattle round (like a coin does) I stepped onto the centre of it and it held my weight for about ten seconds before coming to rest, now it's not centrifugal force 'cos it only turned about once, so does it have a name?

2006-11-02 04:07:07 · 5 answers · asked by bo nidle 4

2006-11-02 04:01:17 · 9 answers · asked by Anonymous

2006-11-02 03:57:18 · 9 answers · asked by Tacymevol 5

2006-11-02 03:53:41 · 10 answers · asked by MAC 1

2006-11-02 03:29:49 · 7 answers · asked by harry potter 1

What is the speed of a bullet...:)

2006-11-02 03:21:57 · 10 answers · asked by Um. Hi. 1

I've got an little presentation 2 do and i was wondering if ne1 knows how rainbows r made, i mean wit all the science stuff about light etc.

if theres ne of u peeple out ther that know sum proper physics n stuff id appreciate it if u cud tel me the anser2this question.
thnks

2006-11-02 03:17:53 · 4 answers · asked by ·´`·.¸.» ALLY «·´`·.¸. 1

A 4.0kg bundle starts up a 30degree incline with 128J of kinetic energy. Howfar will it slide up the incline if the coefficient of kinetic friction between bundle and incline is 0.30?

2006-11-02 03:17:41 · 1 answers · asked by Galaxy D 2

There is a clever kitchen gadget for drying lettuce leaves after you wash them. It consists of a cylindrical container mounted so that it can be rotated about its axis by turning a hand crank. The outer wall of the cylinder is perforated with small holes. You put the wet leaves in the container and turn the crank to spin off the water. The radius of the container is 12 cm. When the cylinder is rotating at 2.0 revolutions per second, what is the magnitude of the centripetal acceleration at the outer wall?

2006-11-02 03:17:17 · 6 answers · asked by Anonymous

a horizontal force of magnitude 35.0N pushes a block of mass 4.0kg across a floor where the coefficient of kinetic friction is 0.600. 1)how much work is done by that applied force on the block - floor system when the block slides through a displacement of 3.00m across the floor? 2)during that displacement, the thermal energy of the block increases by 40.0J. what is the increase in thermal energy of the floor? 3)what is the increase in kinetic energy of the block?

full solution pleas.

2006-11-02 03:14:29 · 3 answers · asked by Galaxy D 2

And He put this little dot there in a special spot of His own preference and it became an absolute frame of reference?
And the whole process without playing with dice(Einstein's statement)?

2006-11-02 03:12:42 · 11 answers · asked by goring 6

A 0.400 kg rock is balancing on the edge of a cliff 500m above a valley. What is the gravitational potential energy of the rock with respecet to the valley below?

HELP please :)

2006-11-02 03:08:05 · 3 answers · asked by Anonymous

2006-11-02 03:03:22 · 3 answers · asked by goring 6