Physics - April 2007

Determine (a) the amplitude, frequency, the period, the total energy, and the KE and PE when x is 9.0 cm?

2007-04-21 19:49:52 · 1 answers · asked by Anonymous

we thought we couldn't exceed the sound barrier because we approached it and failed a few times. but we have never come close to the speed of light to see if we'de fail to attain it.

2007-04-21 18:48:29 · 10 answers · asked by Anonymous

im so Confused...........
they say Earth was Form because of that.....
"Bigbang Theory"
and other's say......
"God created the PLaneT Earth".......
im really confused............
pls help me..........

2007-04-21 17:38:28 · 6 answers · asked by Anonymous

I want website which gives simulation of physics experiments.I basically want it for e/m ratio expt (by jj thompson).

2007-04-21 15:15:34 · 3 answers · asked by Alekh mittal 2

I bought a 100W replacement daylight CFL bulb:
(light output 1500 lumens, energy used 23 watts; the back says for use with 120 volts 60 hz circuits)
I'd like to use it in my home lamp (which says on the lamp, use MAX 60 watt, 120 volt, type A bulb).
But since the actual output of the flourescent I bought is 23 watts, can I use it in the 60 watt lamp, or is it going to be a problem since it is a 100W replacement bulb?

2007-04-21 15:03:32 · 5 answers · asked by art_lover 2

I have a question which is engineering based. i understand this question is probably not possible but I am wondering if anyone with a greater understanding of physics and engineering might have something forward looking ideas or something to add.

In a simple explanation i think it would be possible some how to use human pedal like power to turn a generator of the same size you would use at a nuke plant. Its clear a human can not directly turn it pedal power so no flames please, my question is what what laws of physics could we integrate together to allow this to happen.

Don't forget coal plants and nuke plants which turn these generators are very very costly to run. I should say Extremely costly to run. So try to think of it this way you have let say 12 humans per 8 hour shift per one generator, and they are going to be cream of the crop for this duty.

Give your best answer, answers which say its not possible are fine just back it up. Thanks and have fun

Jasun

2007-04-21 14:46:27 · 11 answers · asked by Jason P 3

2007-04-21 14:07:33 · 4 answers · asked by Angel 1

Does anyone know anything about the program webassign? I can't figure out how to enter scientific notation. For example...if the answer was 1.28*10^-14...it says its wrong when I type it in. then i tried to do it like this- 1.28 E-14 and it says it can't read it? Are there other ways to enter scientific notation.



Or possibly I just did the problem wrong...wanna check my work!?

1-Calculate the force of gravity on a 13 kg mass if it were 6.4 106 m above Earth's surface (that is, if it were 2 Earth radii from Earth's Center.) The mass of Earth is 6 1024 kg.


2-Calculate the force of gravity between Earth and the sun (Sun's mass = 2.0 1030 kg; Earth's mass = 6 1024 kg; average Earth-Sun distance = 1.5 1011 m).



(those are the two problems that i can't figure out how to enter...thanks for your help!!)

2007-04-21 13:51:28 · 1 answers · asked by Jane A 3

2007-04-21 13:06:36 · 2 answers · asked by Anonymous

Do they go into space? Or just like fall back onto earth? Or what?!

2007-04-21 11:54:03 · 9 answers · asked by Anonymous

When a large explosion goes off, does the sound reach you faster as an observer because the shockwave pushed the air towards you faster?

http://www.maniacworld.com/massive-detonation-of-100-tons-of-explosives.html

2007-04-21 09:06:00 · 3 answers · asked by Matthew L 4

If you have a pulley system which had a fixed pulley attatched at the top of a retort stand. And Through it came a rope which attatched to a movable pulley which is attatched to the load. What would be the IMA and how would I calculate the AMA?

2007-04-21 09:04:14 · 1 answers · asked by DUDE 2

2007-04-21 08:58:50 · 3 answers · asked by Butterfly 1

Hello everyone,

I am having a little bit of a problem of how to do my physics planning excercise for this year, so I wondered if anyone can help?

Basically its all about LDRs' and the main point of it is to investigate how the intensity of light emitted by a lamp varies with wavelength.

So I was wondering if any of you big clever people could think of a way to investigate this?

Think about:

-How light intensity can be determined?

-How range + precision of any instruments that would be used?

Thanks everyone and much apprieciated! This is the only one I ever got stuck on. Its probably so simple I am thinking to hard.

Peace!

Mav

2007-04-21 08:50:25 · 3 answers · asked by Anonymous

30 Kg. child moving at 4 m/s jumps onto 50 kg sled that is initally at rest on long, frictionless, horizontal sheet of ice.

(a) Detrmine that speed of the child-sled system after the child jumps onto sled.

(b) Detrmine the kinetic energy of the child sled system after the child jumps onto sled.

After coasting at constant speed for a short time, the child jumps off the sled in a such a way that she is at rest with respect to the ice.

(c) Detrmine the speed of the sled after the child jumps off it.

(d) Detrmine the Kinetc Energy off the child-sled system when the child is at rest on the ice.

(e)compare the kinetic energy tht were determine in parts(b) & (d). if the energy si greater in (d) tht is in (b), where did the increse come from?if the energy less in(D) thn it is in (b) where did the energy go?

2007-04-21 08:31:08 · 3 answers · asked by krish s 1

2007-04-21 08:07:57 · 6 answers · asked by Derek W 1

explain the implications for scientific theory..

2007-04-21 07:55:09 · 1 answers · asked by Derek W 1

2007-04-21 07:34:24 · 4 answers · asked by !@#$%^&* 2

I always see movies and video games with heroes who can lift things twice their weight and use them as a weapon. There is a character in Metal Gear Solid called Vulcan Raven who is able to pick up a gigantic vulcan cannon from a helicopter and use it as a hand held weapon. Now, I understand that's just fiction and hollywood but still it makes me wonder. Just how strong can a person possibly make themselves and what is the maximum amount of weight a person can lift? Is there a limit to just how strong a person can get and how much they can lift up?

2007-04-21 07:21:22 · 3 answers · asked by Anonymous 1

look im very smart in matter of fact im in 5th grade doing 11th grade math and science.

2007-04-21 06:28:07 · 8 answers · asked by Anonymous

2007-04-21 06:11:13 · 21 answers · asked by s.s 2

How do you determine when a reaction is endothermic or exothermic?

(Na + ½ Cl2 → NaCl for example)

How do you do this in terms of Physics and Chemistry?

2007-04-21 05:34:41 · 1 answers · asked by Anonymous

An assumption of the Einstein's theory of relativity was the claiming that light's velocity is INDEPENDENT of the relative motion of its source as well as the observer. By pointing that since there is no difference between the speed of light in directions back-and-forth of earth's motion and perpendicular to the earth's motion, because of that, there is no ether wind. But I claim that the speed difference between both trips of light's travel could not be detected because the difference is so so extremely minute to be detected by anything. If anyone dont approve my thinking , then just work out diagrammatically on a paper and see how much extremely minute, the difference between both speeds is.If one day we find so accurate an equipment to detect suchminor differences (if there is any difference), still we can say light's speed is DEPENDENT onthe relative speeds of the mediumof light (the air dragged by the earth or even ether may be dragged). If so, why time dilation?

2007-04-21 05:19:53 · 8 answers · asked by Intensive 2

2007-04-21 04:01:42 · 1 answers · asked by syed q 1

2007-04-21 03:49:40 · 3 answers · asked by sweet l 1

--Does his Theory imply that if you gradually expose yourself to an increasingly extreme condition (such as pulling more G's) in an aircraft..that then it must be true that there with the right training and starting at an early age there is no limit to the speed a human can travel. People may say "how can the span of a human life train for that?" The answer is the fster you travel the slower you age, its is not an all or nothing phenomenon where you stop aging at the speed of light but it works like this as you approcah the speed of light or move at all you age less than when idle, at the speed of light you do not age, beyond the speed of light some say you age in reverse....

2007-04-21 02:08:30 · 6 answers · asked by Brian C 1

2007-04-21 01:57:11 · 8 answers · asked by Brian C 1

Niagara Falls is about 53 m high. An estimated 6 x 106 kg of water passes over the falls every second. If the energy of the falling water were usefully employed, what power could be produced?

2007-04-21 01:25:30 · 6 answers · asked by Amber B 1

i know that according to theory of relativity time dilation happens at speed of light but y it happens? plzz explain me in easy format and simple terms.

2007-04-21 00:11:14 · 6 answers · asked by gaurav g 1

I believe,once again,that this question belongs to the topic of electric charges.I would be grateful to get an answer

2007-04-20 23:30:25 · 4 answers · asked by leona 1