Physics - July 2007

Of a Hydrogen atom. Please help.

2007-07-18 01:09:09 · 3 answers · asked by Bigbob22 2

2007-07-18 00:55:16 · 9 answers · asked by Deepak 1

Our physics teacher just asked this question in class. And I'm pretty sure it is possible.Acceleration is given by the formula v-u/t.
But if the sum (v-u) is not zero then acceleration cannot be zero!
Please, I need detailed answers.Just the example won't do.

2007-07-18 00:33:44 · 12 answers · asked by Anonymous

when light passes from water its speed reduces, but at the time when it ceomes out of the wanter, it again regains its original speed. how is that possible.... from where it gets the acceleration to come again to its original speed....?

2007-07-17 23:51:31 · 6 answers · asked by omi 1

2007-07-17 21:58:46 · 29 answers · asked by Anonymous

2007-07-17 20:49:42 · 9 answers · asked by Anonymous

2007-07-17 19:58:39 · 5 answers · asked by Texican2007 1

Also if possible how can we add two A.C.

2007-07-17 19:47:00 · 4 answers · asked by sunil j 1

If electrons flow to form - to + and current flows from + to - then how can they be the same?

Can someone please explain? Thanks.

2007-07-17 18:16:31 · 5 answers · asked by Anonymous

The space blankets, used by the cosmonaut, are coated by silver from outside because the silver is a ........
(a)good insulator of heat
(b)poor conductor of heat
(c) best radiator of heat
(d)poor radiator of heat
please answer this question.
also i want to know whats the difference between insulator ,conductor and radiator

2007-07-17 18:10:20 · 4 answers · asked by Anonymous

2007-07-17 16:43:46 · 13 answers · asked by pkul2007 2

2007-07-17 14:54:32 · 1 answers · asked by BOYET N 1

2007-07-17 14:32:01 · 2 answers · asked by Anonymous

I just came back to studying physics after a month break, and I'm starting to get my feet wet again. I've come across a problem which I just cannot figure out. Two boxes are connected with a length of rope connecting the top of the bottom box to the bottom of the top box. There is also a rope coming out of the top of the top box. Each box is 10 kg, the mass of the strings is negligible. The boxes are accelerated upwards at 5 m/s^2. I need to find the tension in both strings.

Now, I know I should use F = ma (F = 10*5 = 50?), but I also need to incorporate g = 9.8 m/s^2... How do I do this problem? Again, I apologize for the triviality of the problem.

2007-07-17 14:17:19 · 4 answers · asked by Anonymous

http://s76.photobucket.com/albums/j29/E_man777/?action=view¤t=tricycle_l.jpg

On the tricycle above, the pedals are locked to the wheel.
What happens when the Force pulls in the picture above and why?

- I think that the wheel will spin the other way, making the tricycle drive backwards. Is this correct?

Thank you for the help

2007-07-17 13:34:38 · 4 answers · asked by blazin rabbit 2

whenever i sit in my friend's new car, when i get out of the car after a drive, i get a slight electric shock when i touch the door. and its irritating, i dont like it. what can i do to prevent such shock?

2007-07-17 13:31:08 · 4 answers · asked by votremec 2

I'll have one which shoots blue or green laser/lazer bolts.

You baddies can have the ones which shoot red bolts.

Bullets are so passé.

2007-07-17 13:31:02 · 12 answers · asked by golfgirl 3

2007-07-17 13:16:47 · 6 answers · asked by Anonymous

oh my go...im so frustrated bcuz i cnt remember howta do this...can som1 help me plsz?!?!..
thank yuh

2007-07-17 13:02:47 · 11 answers · asked by ↕•||||•↕ 1

ok this might get kinda confusing but here it goes.
Lets say that we have 2 intelligent species with the same capabilities and resources in two diferent planets.
So lets suppose that one of planets speed is 1 km per second, and the other planet speed is 200 km per second.
Ok so the species living in the slower planet meets the species living the faster planet in a very very very distant future.
The species that lived in the slower planet would be more advanced than the species that lived in the faster planet, this because of time dilation right?

2007-07-17 13:01:09 · 3 answers · asked by Anonymous

2007-07-17 12:46:38 · 4 answers · asked by charlie 1

I need to know how to determine the amount of CO2 needed to inflate a life raft without damage by over inflation.

2007-07-17 12:34:02 · 3 answers · asked by arcturus 1

A toy cannon uses a spring to project a 5.30-g soft rubber ball. The spring is originally compressed by 5.00 cm and has a force constant of 8.00 N/m. When the cannon is fired, the ball moves 15.0 cm through the horizontal barrel of the cannon, and there is a constant friction force of 0.032 N b/t the barrel and the ball. (a) With what speed does the projectile leave the barrel of the cannon? (b) At what point does the ball have max speed? (c) What is this max speed?

I figured out part a, need help w/ b & c....

2007-07-17 12:21:42 · 2 answers · asked by Anonymous

2007-07-17 12:11:10 · 2 answers · asked by Maria G 1

1. A roller coaster car rolls over the crest of a 30m high hill at a speed of 3.2m/s. The car then rolls down the track to the bottom of the hill and continues up the next hill, which is 20m high. Determine the speed of the car at the top of the second hill.

2. Maria wants to dive from the seaside cliff, but she does not feel safe hitting the water faster than 20m/s (44mi/h). What is the maximum height from which she dive?

2007-07-17 11:46:47 · 3 answers · asked by sunshinegirl93534 2

A toy cannon uses a spring to project a 5.30-g soft rubber ball. The spring is originally compressed by 5.00 cm and has a force constant of 8.00 N/m. When the cannon is fired, the ball moves 15.0 cm through the horizontal barrel of the cannon, and there is a constant friction force of 0.032 N b/t the barrel and the ball. (a) With what speed does the projectile leave the barrel of the cannon? (b) At what point does the ball have max speed? (c) What is this max speed?

2007-07-17 11:45:33 · 2 answers · asked by Anonymous

2007-07-17 11:26:58 · 5 answers · asked by t_on_e 3

A child's rubber balloon of mass 2.5g is filled with helium gas of density .33kg/m^3. The balloon is spherical, with a radius of 12cm. A long cotton string with a mass of 2.0g per meter hangs loosely from the bottom of the balloon. Initially, the string lies loosely on the floor, but when the balloon ascends, it pulls the string upward and straightens it out. At what height will the balloon stop ascending, having reached equilibrium with the hanging portion of the string? Assume that the surrounding air has the density 1.29 kg/m^3

2007-07-17 11:23:27 · 1 answers · asked by yahoo answers 1

A tube is bent so that both ends are upward; the tube contains some water. Gasoline is poured into one end of the tube; the region with gasoline is 20cm high. How much higher is the gasoline-air surface than the water-air surface?

2007-07-17 11:18:05 · 6 answers · asked by yahoo answers 1

2007-07-17 11:09:57 · 5 answers · asked by kobukmike 1