Physics - June 2007

I just want to make a little bang out of it, but i dont know how to do it, without using any other uncommon substances (f.ex. gun powder, etc)

2007-06-11 09:05:41 · 6 answers · asked by Anonymous

i.e. what would exist eyond the universe. "Universe is infinite" is not an answer

2007-06-11 09:00:33 · 9 answers · asked by David P 1

An airplane flies 200 km due west from city A to city B and then 255 km in the direction of 34.0° north of west from city B to city C. In straight-line distance, it is 437.7 km from city C from city A

Relative to city A, in what direction is city C?

2007-06-11 08:14:47 · 5 answers · asked by Idaly M 2

Since big bang has expanding space dragged energy along with it?

Basically, how do space and energy relate/interact in an expanding universe?

2007-06-11 07:34:39 · 2 answers · asked by Andrew H 2

2007-06-11 07:18:08 · 14 answers · asked by mick s 1

If so is heaven hotter then hell?

2007-06-11 06:33:15 · 9 answers · asked by Anonymous

2007-06-11 06:25:53 · 7 answers · asked by lindi 2

This question seemed easy til i started to plug in the knowns and I got the wrong answer
A gymnast is swinging on a high bar. The distance between his waist and the bar is 0.8 m, as the drawing shows. At the top of the swing his speed is momentarily zero. Ignoring friction and treating the gymnast as if all his mass is located at his waist, find his speed at the bottom of the swing.

I manipulated the conservation of mechanical energy formulas and ended up with v=squareroot (2*g*h)<

2007-06-11 06:20:45 · 4 answers · asked by gayle w 1

A 54.0 kg skateboarder starts out with a speed of 1.90 m/s. He does +80.0 J of work on himself by pushing with his feet against the ground. In addition, friction does -265 J of work on him. In both cases, the forces doing the work are nonconservative. The final speed of the skateboarder is 6.15 m/s.
(a) Calculate the change (PE = PEf - PE0) in the gravitational potential energy.
J

(b) How much has the vertical height of the skater changed?
m

(c) Is the skater above or below the starting point?
below the starting point
above the starting point


Really having a hard time doing this problem, gravitational potential energy problem no examples like this in my book and the teacher never taught us this part of the chapter can you please help me get started!

2007-06-11 06:02:19 · 1 answers · asked by gayle w 1

Two loudspeakerse are mounted on a merry go round whose radius is 9.01m. When stationary the speakers both play a tone whose frequency is 100 Hz. They are situated at opposite ends of a diameter. The speed of sound is 343 m/s and the merry go round revolves once every 20s. What is the beat frequency that is detected by the listener when the speakers are both pointing at him from equal distances?

Thanks for any help you can offer

2007-06-11 05:55:25 · 3 answers · asked by Anonymous

Folks, my engineering structures teacher told me moment of inertia is nothing but resistance to bending.
Though I understand it, I cant ..... well its a hard feeling to explain.

1)what is moment of inertia?
2)What is the formula to calculate it for various shapes?
3)how do we get the formula?
4)How to find the moment of inertia of a square of side 1 m?

Please help me out.

2007-06-11 05:54:01 · 0 answers · asked by Anonymous

A 4.50X10^4 kg space probe is traveling at a speed of 12000 m/s through deep space. Retrorockets are fired along the line of motion to reduce the probe's speed. The retrorockets generate a force of 3.00X10^5 N over a distance of 2500 km. What is the final speed of the probe?

set this problem up using the formal FD=work and the wnc=final energy-initial energy
750000000=1/2(4.5X10^4)(v-1200)^2-(4.50*10^4)(9.80)
i got 1382.628<<

2007-06-11 05:53:10 · 3 answers · asked by wildcherrychica1 2

More specifically a infinitely rigid steel body bouncing off the ground.

2007-06-11 05:52:11 · 1 answers · asked by schlouey 3

And how does it apply to a boat on the water.

2007-06-11 05:37:12 · 6 answers · asked by Mike C 1

I know compressed air in a tank is heavy-er than at normal presher. So if you put helium in a tank under a high vacuum, Would the tank be lighter?

2007-06-11 04:51:12 · 10 answers · asked by skully 2

you have 3 coins, 2 fair coins and one with probability of head being 1/3. A coin was dropped and lannded head up. The probability that it is a fair coin is
(a) 1/3
(b) 1/2
(c) 3/4
(d) 3/4

2007-06-11 04:42:15 · 3 answers · asked by honey 1

I watched a video of this on youtube, and I found myself wondering why this happens! I suppose it's some sort of accumulation of the water molecules or being pulled or something... but what exactly is it? I will pick a best answer today! THANKS!!!!!!!!!!!

2007-06-11 04:21:53 · 4 answers · asked by Anonymous

2007-06-11 04:05:42 · 10 answers · asked by ≈ nohglf 7

An 800w,220V kettle and three 100W,220V bulbs are connected in parallel across a 220V source.The current drawn from the source-
1. 6.9A
2. 5.5A
3. 5.0A
4. .15A

2007-06-11 03:50:10 · 4 answers · asked by godisgreat 1

2007-06-11 03:50:09 · 5 answers · asked by Anonymous

what holds the neutrons and protons together in an atom.
Gravitational forces are too weak( dont argue with this point)
Electric forces are repulsive not attractive( 2 protons ), so what holds them together?? please be specific and to the point dont just write paragraphs and paragraphs.

2007-06-11 03:29:22 · 7 answers · asked by M!z0 3

If the point (3, 7) is dilated with a scale factor of ____, and the center of the dilation is at the origin, then the image of that point is (12.75, 29.75).

2007-06-11 03:17:12 · 1 answers · asked by Anonymous

2007-06-11 02:43:35 · 23 answers · asked by asheesh 1

Usually heat flows from a body at higher temperature to the one at lower temp.till an equilibrium is struck i.e.till both the bodies have the sme teperature,is it possible to utilise the quantity of heat available in large bodies say a large water tank to raise the temperature of a smaller waterbody?

2007-06-11 02:40:16 · 4 answers · asked by riaz 2

2007-06-11 02:28:08 · 6 answers · asked by Kerri L B 1

2007-06-11 01:27:54 · 4 answers · asked by supersizedbigmacdaddy 1

choose only one and explain

2007-06-11 01:02:27 · 12 answers · asked by Nick 1

We have the intelligence to store the energies like Sound, if the President talks at one place of the Country it can be brought to where ever we like to hear. Can it be possible in the Energy of Light.

2007-06-10 23:13:39 · 12 answers · asked by selvaaindia 1

2007-06-10 23:03:23 · 16 answers · asked by siva 1

Air is invisible, but very fast air can show a contrail, like on a plane upper wing. Why?

2007-06-10 23:00:10 · 4 answers · asked by high-lighter 3