Physics - January 2007

Does a traveling light particle, traveling at the speed of light become trapped in time? If the theory of relativity is true then as a object travels near the speed of light, time slows down. Once that object reaches light speed, time stops. If time stops then the eight seconds that a light particle takes to reach earth from the sun would become a infinite amount of time relative to that particle, meaning that the particle never reaches earth. How can something both happen (particle reaches earth) and not happen (particle is frozen in time) at the same time? Be on the lookout here soon for another question I will be posting concerning the speed of light.

2007-01-14 15:16:08 · 11 answers · asked by jedi1josh 5

I just saw a Lexus commercial. It had (simulated, of course) one Lexus dropped from a helicopeter from 4000 feet. It had another one on the ground, which started from a dead stop 4000 feet from where the dropped Lexus would hit. The driven car passed underneath the dropped vehicle before the dropped one hit the ground. So, in theory, the driven car was moving faster than the dropped one. Unfortunately, my math skills aren't up to figuring out how fast either car was moving, and how long it took them to get up to that speed. Any one with an answer? And thanks in advance.

2007-01-14 15:08:09 · 4 answers · asked by Brian T 1

or would you need an electron microscope?

2007-01-14 15:05:11 · 6 answers · asked by SCOTT M 1

2007-01-14 14:53:12 · 1 answers · asked by babydd39 1

2007-01-14 14:47:33 · 5 answers · asked by Anonymous

2007-01-14 14:38:27 · 4 answers · asked by babydd39 1

When an earthquake occurs, two types of sound waves are generated and travel through the earth. The primary, or P, wave has a speed of about 8.0 km/s and the secondary, or S, wave has a speed of about 4.5 km/s. A seismograph, located some distance away, records the arrival of the P wave and then, 78 s later, records the arrival of the S wave. Assuming that the waves travel in a straight line, how far is the seismograph from the earthquake?

2007-01-14 14:20:22 · 1 answers · asked by pearlygaze 3

Two blocks are connected by a wire that has a mass per unit length of 8.50 X 10^-4 kg/m. One block has a mass of 19.0 kg, while the other has a mass of 42.0 kg. These blocks are being pulled across a horizontal frictionless floor by a horizontal force P that is applied to the less massive block. A transverse wave travels on the wire between the blocks with a speed of 352 m/s (relative to the wire). The mass of the wire is negligible compared to the mass of the blocks. Find the magnitude of P.


If you understand this, can you please tell me how you did it? Thanks!

2007-01-14 14:18:00 · 2 answers · asked by pearlygaze 3

structural faliure

2007-01-14 12:51:19 · 3 answers · asked by steve r 1

Can someone please tell me what other transistor I can use instead
2SA933 and what diode can I use instead 1SS119

2007-01-14 12:48:09 · 3 answers · asked by Dominator. 2

Are positrons classified as a lepton or a quark?

2007-01-14 12:06:10 · 3 answers · asked by Anonymous

I need help on these two problems regarding work, power, and machines:

1. An effort force of 200 N is applied to an ideal machine to move a 750 N resistance a distance of 300 cm.
A) Through what distance must the effort force act?
B) What is the ideal mechanical advantage of the machine?

2. A mover pushes a 260-kg piano on wheels up a ramp 7 m long onto a stage 1.75 m above the floor. The mover pushes the piano with a force of 680 N.
A) How much work does the mover do?
B) What work is done on the piano by the machine?
C) What is the efficiency of the machine?

Thanks for all your help!

2007-01-14 12:05:56 · 3 answers · asked by Anonymous

friend brought this book over showing details of this thought experiment, but it didnt explain how an atom or photon changed into a wave when it is observed, how can an atom know its being observed? another section of the book explained how they started to observe the atom after it has been shot through the slit and it still changed form. I am not very educated in terms of physics so please keep your respones in laymens terms

2007-01-14 11:54:39 · 5 answers · asked by Anonymous

2007-01-14 11:43:33 · 6 answers · asked by RODI M 2

1.) what is the most chemically reactive non-metal?
2.) which element is a metalloid by location but has properties that suggest its a light metal? (Al?)
3.) what is the most metallic element?
4.) What is the heaviest element on the planet?

2007-01-14 11:12:25 · 6 answers · asked by =) 2

I need one factor that may cause the density of an object to change. I have a test tomarrow and i have no clue!! help!!

2007-01-14 11:08:02 · 10 answers · asked by Jess 2

And if all weight did increase, by how much would it?

2007-01-14 11:05:16 · 6 answers · asked by somerslats 2

I have been stuck on this question for quite a while now and I'm looking for some hints.

Two particles execute simple harmonic motion of the same amplitude and frequency along close parallel lines. They pass each other moving in opposite directions each time their displacement is half their amplitude. What is their phase difference?

Thanks in advance.

2007-01-14 10:53:39 · 3 answers · asked by churning 1

Explain the relationship between force, work, power, and energy. Give examples.

Use vertical and horizontal velocity vectors to describe what happens as a ball is thrown in a nice arc and hits the ground.

Explain why a ball that bounces off the floor transfers more force to the floor than one that sticks to the floor.

Explain motorcycle (and bicycle) wheelies.

What is meant by impulse and collisions.

Explain energy, velocity, and acceleration during a skydiver's journey from the plane to earth.

Explain how to measure the velocity of your throw with a stop watch and meter stick.

Explain how a great basketball player stays in the air for a dunk for 2 seconds. Discuss

2007-01-14 10:49:38 · 1 answers · asked by Anonymous

Explain how to measure the speed of sound with a tuning fork.

Explain how radar guns affect your speeding ticket.

Explain Rogue waves.

Explain sonic booms.

Explain Galloping Gerty.

THank you

2007-01-14 10:45:18 · 2 answers · asked by Anonymous

In Other Words, I am confused by the way current flows. If it flows from + to -, then which side of the battery has got the higher potential, the + or the - one?

2007-01-14 10:42:46 · 1 answers · asked by Anonymous

The band members are trying to move the new 50 kg amplifier to the garage where they practice. If they exert a force of 20 newtons, at what rate will the amplifier accelerate?

2007-01-14 10:31:25 · 4 answers · asked by maconheira 4

1.)The Speed of the blood is dependent on its pressure and flow rate. What will happen to the speed of blood if the pressure is
a. doubled
b. tripled
c. reduced to half of its normal value

2.) A certain bacteria swims with a speed of 3.5 micrometer / second. How long will it take to cross the ends of a petri dish, if the diameter of the dish is 9cm?

2007-01-14 10:29:00 · 1 answers · asked by Samlovesjesea 1

If you were to press the two center points of an egg on the top and bottom with all your strength the egg will not break but if you do it sideways it breaks easily. Why is this possible?

2007-01-14 10:12:05 · 1 answers · asked by TwilightHour17 2

If so, what effects would it have on the body? And what would be experienced during the travel?

2007-01-14 10:10:14 · 9 answers · asked by Anonymous

A 1.00 Kg objectis attached to a horizontal spring.the spring is initially stretched by 0.100 m, and the object is released from rest there.it proceeds to move without fricton.the next time the speed of the object is zero is 0.500 a later.

what is the maximum speed of the object?

2007-01-14 09:49:42 · 2 answers · asked by reem h 2

the problem says... compare the input work to the output work. Based on your comparison, decide whether the principle of conservation of energy is violated. Explain your answer.

note:work input=4,500 J
work output=5,400 J

i think yes this principle is violated because more work was put out than into. plz help me with this?

2007-01-14 09:41:28 · 3 answers · asked by dreamz 4

1) the circumference
2) the diameter
3) the radius
4) it depends on the size of the circle

2007-01-14 09:32:59 · 6 answers · asked by WiLLiAm D 2

Plz help on these 2 physics problems?
1. The top pulley hanging from the support produces only a change in direction of the effort force and not any mechanical advantage. Explain.

2. Determine the relationship between the number of strands supporting a block and tackle and its mechanical advantage.

note that...
mechanical advantage=Resistance(load)N/Effort(force)...
which is usually>1

2007-01-14 09:26:39 · 2 answers · asked by dreamz 4

I was thinking about this the other day and wondering about magnetic flux and gravity-- I know that they are not related, but was wondering about the similarities. Does magnetic flux travel at the speed of light? What is magnetic flux? By that I mean how is it transmitted? Light is photons, and possibly gravity transmitted by gravitons--so what is magnetic flux made out of? I was wondering if gravity could be described in a similar fashion--as a field but without the flux lines--sort of a gravity flux sphere I guess. I know that we don't really understand how gravity really works yet, whether it is particle or field or both or something else entirely that we haven't thought of yet, was just wondering if someone could clear up the magnetic flux thing.

On a side note, are the strong and weak forces similar? Are they fields too? Thanks!

2007-01-14 09:17:15 · 4 answers · asked by ~XenoFluX 3