Physics - September 2007

the expansion of the singularity, was nothing before that, and if so, what would be your thoughts on the meaning of "nothing"?

2007-09-15 18:49:14 · 6 answers · asked by Anonymous

in physics

2007-09-15 17:59:53 · 6 answers · asked by lynxelaine 1

Suppose that two identical objects go around circles of identical diameter, but one object goes around the circle twice as fast as the other. The turning (centripetal) force required to keep the faster object on the circular path is:

a) the same as the force required to keep the slower object on the path.
b) one-fourth as much as the force required to keep the slower object on the path.
c) half as much as the force required to keep the slower object on the path.
d) twice as much as the force required to keep the slower object on the path.
e) four times as much as the force required to keep the slower object on the path.

2007-09-15 17:06:04 · 2 answers · asked by ? 6

I have read explanations in the past, but some things are unclear (big surprise) to me:

1. How do particles become "candidates" for entanglement? Were they somehow related before hand, or do they just have to interact at some point?

2. They apparantly exhibit their respective behaviors without respect to causality -- how is this proven and how is it possible? ("we don't yet know" is an acceptable answer)

3. How does this translate into the possibilty of "quantum teleportation"? I don't see or understand the flow of logic.

I am no math whiz -- if you can explain it without math, great -- but if you must, be gentle with me. This is one of the most fascinating subjects I can imagine.

2007-09-15 17:04:49 · 3 answers · asked by glinzek 6

Additional Details

12 minutes ago
Hereis my aditional edit that people believed I cannot go back in time. You see I added more info.

I guess I go ahead and patent it. I will start with provisional caus I dont have money yet. And I find lawyer to write claims for me. We used lightning rocket to shoot in the sky to create artificial lightning. Then it strikes the cylinder and then I cannot tell you ....

29 seconds ago
Why I got reported for asking a question? What if I invented time machine why cannot that happen someone invented stupid tolet paper you use to wipe your fat ***

23 minutes ago - 3 days left to answer. - 20 answers - Report It

2007-09-15 16:29:51 · 10 answers · asked by G 1

What is the net force acting on a 25-N freely falling object? What is the net force when the object encounters 15 Nof air resistence? When it falls fast enough to encounter 25 N of air resistence?

2007-09-15 16:14:35 · 1 answers · asked by Anonymous

2007-09-15 15:56:08 · 6 answers · asked by Anonymous

What is the velocity of car 2 relative to car 1? Help Physics question??Thanks :)?
Two cars approach a street corner at right angles to each other. Car 1 travels at a speed relative to Earth v1E = 27 km/h, and car 2 at v2E = 51 km/h.

(a). What is the relative velocity of car 1 as seen by car 2?
57.71 km/h; 62.103° (west of north)

(b). What is the velocity of car 2 relative to car 1?
........km/h;.......° (south of east)


Please help me to do this Physics Question? i got the first questions and it turns out to be right..but how do i get the velocity of car 2 relative to car 1?????????? please show the work also ..Thanks :)

2007-09-15 15:45:18 · 2 answers · asked by Nikita 1

A major league pitcher can throw a baseball in excess of 46.7 m/s. if a ball is thrown horizontally at this speed, how much will it drop by the time it reaches the catcher who is 19.2 m away from the point of release?

2007-09-15 15:41:04 · 3 answers · asked by Anonymous

2007-09-15 15:39:16 · 3 answers · asked by Anonymous

2007-09-15 15:32:28 · 1 answers · asked by Anonymous

2007-09-15 15:09:53 · 17 answers · asked by Anonymous

2007-09-15 14:57:37 · 3 answers · asked by tchershelly 1

Two forces, 474 N at 11± and 425 N at 32± are
applied to a car in an effort to accelerate it.

m=3395 kg
Force 1= 474 Newtons at 11deg above horizontal.
Force 2= 425 Newtons at 32deg below horizontal.

1) What is the magnitude of the resultant of
these two forces? Answer in units of N.

2) Find the direction of the resultant force (in re-
lation to forward, with counterclockwise con-
sidered positive).
Answer in degrees from the positive x-axis,
with counter-clockwise positive, within the
limits of -180deg. to 180deg. Answer in units of deg.

3) If the car has a mass of 3395 kg, what accel-
eration does it have?
Ignore friction. Answer in units of m=s2.

2007-09-15 14:40:02 · 1 answers · asked by alex v 1

To stop a car you require first a certain reaction time to begin breaking; then the car slows under a constant breaking deceleration. Suppose that the total distance moved by your car during these two phases is 186 ft when its initial speed is 50mi/h, and 80 ft when the initial speed is 30 mi/h. What are a) your reaction time and b) the magnitude of the deceleration.

If you can answer this you are a genius.

Thanks in advance

2007-09-15 14:33:02 · 1 answers · asked by cage k 2

This is a question from my Physics homework and I cannot figure it out. PLease help showing the steps to get to the final answer. Thanks.

2007-09-15 14:22:45 · 1 answers · asked by infamous 3

s is the lengh of the arc (m) , r is the radius (m) et θ is the angle in radian how to demonstrate this formula??? thanks a lot

2007-09-15 14:11:03 · 4 answers · asked by Anonymous

You stand on a chair and jump off
The Earth is lurching up toward you with acceleration a.
If your mass is 96 kg, what is value of a?
If the seat of chair is 30 cm off ground, how far does Earth move while you are falling?

2007-09-15 14:08:36 · 4 answers · asked by ひいらぎ 5

When I mention Physics to someone in the US they said "yea..it's good to excersize" (Physics = phys ed). The average American has no conception about anything deeper than belching.

2007-09-15 13:38:55 · 2 answers · asked by Anonymous

Today I was at the mall waiting for the elevator. Me and 9 other people walked into the elevator. I was number 9 and as I walked in the elevator started to move up then quickly stopped. The doors closed and it went up very slow and there was a lot of vibration and noise. The capacity was 4500 lbs. And everyone was average wegiht. Can they move when the doors are open? It's a brand new mall, so I know nothing is broken down.

2007-09-15 13:12:53 · 7 answers · asked by Dude 4

2007-09-15 12:58:28 · 2 answers · asked by ? 3

can you give me more information, web page? or anything?

thanks would b anwesome...i'm doing a project..heheh

2007-09-15 12:46:11 · 8 answers · asked by elia_princess 2

A car travels 22.4 km due North & then 34.9 km in a direction 45.8 degrees west of North. Find the magnitude of the car's resultant displacement. Answer in units km

2007-09-15 12:36:50 · 2 answers · asked by Anonymous

what will occur to it when heated and cooled

2007-09-15 12:34:05 · 1 answers · asked by Anonymous

A model rocket is launched straight upward
with an initial speed of 47.8 m/s. It acceler-
ates with a constant upward acceleration of
2.19 m/s2 until its engines stop at an altitude
of 180 m.
a) What is the maximum height reached by
the rocket? Answer in units of m.
b) When does the rocket reach maximum
height? Answer in units of s.
c) How long is the rocket in the air? Answer
in units of s.

2007-09-15 11:53:51 · 1 answers · asked by Anonymous

2007-09-15 11:43:34 · 2 answers · asked by Anonymous

A 3.90 kg penguin runs onto a huge horizontal sheet of frictionless ice. The sheet lies on the xy-plane. At t = 0 s it is at x = 0 m and y = 0 m with an initial speed of 0.71 m/s along the positive x-axis. It slides while being pushed by the wind with a force of 0.53 N directed along the positive y-axis. Calculate the penguin's speed at t = 7.43 s.

2007-09-15 11:37:03 · 2 answers · asked by Dustin D 1

What part of the atom does it come from?

2007-09-15 11:33:39 · 16 answers · asked by futuretopgun101 5

The total distance of an ice skating course is 200 km, and the record time for covering it is 5 hours, 40 min, 37 sec.

a: what is the average speed of the race?

b: If the first half of the distance is covered by a skater moving with a speed of 1.05v (where v is the average speed found in (a), ) how long will it take to skate the first half?

2007-09-15 11:32:55 · 1 answers · asked by fatiimaq08 3

and whats a negative refraction

2007-09-15 11:15:55 · 6 answers · asked by C12H22O11 4