Physics - March 2007

2007-03-26 05:24:16 · 15 answers · asked by Anonymous

2007-03-26 05:20:36 · 6 answers · asked by Anonymous

The sky is blue because?

A) the atmosphere transmits mostly blue light.

B) molecules scatter blue light more effectively than red light.

C) the atmosphere absorbs mostly blue light.

D) molecules scatter red light more effectively than blue light.

E) the Sun mainly emits blue light.

is the answer b please explain

2007-03-26 05:18:53 · 8 answers · asked by Diggler AKA The Cab Driver 1

2007-03-26 05:17:41 · 9 answers · asked by Anonymous

2007-03-26 05:15:26 · 6 answers · asked by Anonymous

2007-03-26 05:12:32 · 5 answers · asked by Anonymous

In a desert stands a 6 meter thick sound barrier, such that if you were surrounded by it on all sides, you would not hear a truck running outside, it is dense concrete in combination with sound absorbing cones. You are standing on one side of the barrier,
(in its shadow) on the other side a truck starts .There are no objects in front of you to reflect the sound of the truck back.
You can hear the truck start. Is this right or wrong, if it is right, how can the ball-and-spring model explain transduction of the wave ? Thx a lot, again, we are assuming here that the barrier is really sound proof, truck motor cannot make it vibrate..

2007-03-26 05:07:32 · 2 answers · asked by kim j 1

We can turn on the light at night but not turn on the dark during daytime. Possible use is drivein theaters during the day.

2007-03-26 05:05:19 · 6 answers · asked by Gilbert S 1

2007-03-26 04:48:54 · 4 answers · asked by Anonymous

A 0.750-kg object hanging from a vertical spring is observed to oscillate with a period
of 2.00 s. When the 0.750-kg object is removed and replaced by a 1.25-kg object, what
will be the period of oscillation?

2007-03-26 04:47:43 · 2 answers · asked by Hilary R 1

A spherical weather balloon is designed to expand to a maximum radius of 17 m when in flight at its working altitude where the air pressure is 0.033 atm and the temperature is 175 K. If the balloon is filled at atmospheric pressure at 300 K, what is its radius at lift-off?

2007-03-26 04:23:02 · 3 answers · asked by Division12 2

Here's there question:

A school bus full of pupils was pulling away from the curb adjacent to the school when the driver heard a squeal of brakes behind. He did not feel an impact but stopped the bus to see what had happened. At the rear of the bus, a car had come to a halt some 60cm from the bus with skid marks 64.56m in length on the dry asphalt road surface. Determine if the driver of the car was exceeding the speed limit of the urban area.
Much appreciated
Thanks

2007-03-26 04:22:52 · 5 answers · asked by Anonymous

I have this problem for extra credit, one of 35, and this is the last one i need. i think i am my own worse enemy on this one because everything i try that makes sense to me doesn't work. I only have 2 submissions left. Thanks!

In Robert Heinlein's The Moon Is a Harsh Mistress, the colonial inhabitants of the moon threaten to launch rocks down onto the Earth if they are not given independence (or at least representation). Assuming that a rail gun could launch a rock of mass m at 2.50 times the lunar escape speed, calculate the speed of the rock as it enters the Earth's atmosphere.

2007-03-26 04:21:19 · 2 answers · asked by Kacey L 1

because our mass is so dense that if any more weight was added then the earth would slowly become a black hole, is this true?

2007-03-26 04:05:55 · 10 answers · asked by Bleeble Blabble 3

If a lightbulb were to emit negative light would it be visible? Would it be the negative of visible(or anti-visible, or totally imperceptible)?

By negative light I mean a theoretical opposite to light, not just darkness as it is the absence of light. So regular light is +, darkness is 0, negative light would be -

2007-03-26 04:04:32 · 3 answers · asked by Luis 6

1. Does the Gyroball defy the laws of Physics?
2. What are the considerable principles and theories on the nature of Gyroball in Physics (Specifically Projectile motion , Angular Momentum)?

2007-03-26 04:03:41 · 2 answers · asked by Kyle J 6

It's a 5mfd used on a furnace motor. I have a volt-ohm meter. Please give me step by step instructions. Thanks

2007-03-26 04:01:47 · 3 answers · asked by tjc 2

In theory can black holes consume antimatter, or would the antimatter somehow negate consumption?

2007-03-26 03:58:46 · 1 answers · asked by Luis 6

I found a suitable battery for my laptop, but I need to know if it's close to 10 hours or so battery life. I can't seem to find the conversion for it, and I haven't had physics in a long time.

2007-03-26 03:36:45 · 5 answers · asked by ♫ Shinedown ♫ 3

If there is a large release of energy, such as in an atomic blast, does that affect time around it at the moment the energy is released?

I'm asking because it seems to affect the space around it, and space and time are connected, so what would the effects be?

2007-03-26 03:21:15 · 4 answers · asked by Luis 6

If I were right in the "doorway" of a wormhole, and the theoretical device creating it failed and the wormhole collapsed, what would happen to my being?

Would I be dispersed atomically through the universe between where the traversed(as in would I be pulled, or stretched, between the 2 points)? Would I simply be at one end or the other, or split in half? Or would I be dumped whole somewhere in between?

2007-03-26 03:18:23 · 6 answers · asked by Luis 6

Some hydrogen gas is enclosed within a chamber being held at 200degrees celcius whose volume is 0.025 m^3. Initially, the pressure in the gas is 1.50 * 10^6 Pa (about 1.5atm ). The chamber is removed from the heat source and allowed to cool until the pressure in the gas falls to .95 *10^6 Pa.

2007-03-26 03:17:25 · 2 answers · asked by RhondaJo 2

plz i have a project about gravitons i got information from wikipedia but i ma not finding enough resources and websites to get infromation from.so plz if anyone knows any website or book i can get infromation from.thanks

2007-03-26 03:15:27 · 2 answers · asked by qt girl 2

how it is going to change life in future ?

i have seen a science documentary 3 years ago, acc. to that every book that is ever written and is available can be in a coin size chip, and much much more

Because of Information.Technology i am able to ask this question, will it effect the life the same way, the I.T. did..

2007-03-26 02:51:04 · 10 answers · asked by Anonymous

A horizontal disc of diameter 12.0 cm is spinning freely about a vertical axis through its centre at an angular speed of 72 rpm
A piece of putty of mass 5.0g drops onto and sticks to the disc at a distance of 4.0 cm from the centre. The angular speed reduces to 60 rpm. (a) Calculate the moment of inertia of the disc
No external torques are applied to the system during this process

(b) A constant tangential force is now applied to the rim of the
disc which brings the disc to rest in 6.0 s Calculate the
magnitude of this force

(c) Calculate the rotational energy of the system before and
after the putty is added to the disc.

2007-03-26 02:42:21 · 1 answers · asked by   4

If I could go into the centre of the Earth, dead centre I suppose, theoretically if it was survivable and such, would gravity at the core be as much as here? Would it be concentrated in a bubble?

Or does it dissipate as it goes through the layers of the planet, and become less potent at the centre?

2007-03-26 02:40:32 · 3 answers · asked by Luis 6

If there was no matter in the universe right now(0 atoms total), would we still have time?

2007-03-26 02:22:23 · 5 answers · asked by Luis 6

In theory, if there were no matter at all right now for some reason(the atoms in the universe would total 0), would the laws of physics still apply, or does the lack of matter mean a lack of laws to govern that matter?

2007-03-26 02:21:16 · 3 answers · asked by Luis 6

Current vacuum technology can achieve a pressure of 1.0 * 10^-10mm of Hg. At this pressure, and at a temperature of 40.0 degrees C.

2007-03-26 02:05:16 · 3 answers · asked by RhondaJo 2

A tank is filled with an ideal gas at 400 K and pressure of 1.00 atm.

2007-03-26 02:01:11 · 5 answers · asked by RhondaJo 2