Physics - September 2007

According to the theory of relativity both senarios are comparable. Than why this difference???

2007-09-29 04:54:31 · 8 answers · asked by vgd 2

Why does the size of a projectile not make a difference in the air resistance, velocity, and distance?

At what height will a projectile take 1.0s to fall?

At what angle will a projectile thrown from level ground to the same level ground go the furthest?

2007-09-29 04:35:45 · 6 answers · asked by brubabe 5

this is a physics question

2007-09-29 04:16:41 · 2 answers · asked by Xiang Yu 1

Here's the image: http://session.masteringphysics.com/problemAsset/1038593/5/YF-05-58.jpg

The seat weighs 233 N and the person weights 820 N
The seat swings in a horizontal circle at a rate of 33.3 rev/min.
What is the tension in each cable?

2007-09-29 04:04:50 · 2 answers · asked by zoro-kun 2

if light has a speed how fast is darkness

2007-09-29 03:28:01 · 11 answers · asked by Anonymous

Hi, I'm thinking every days of this question: As structure the univers ? Any people has the answers of this question ? Any theory of this ? any bibliography ? Please, Help me.

2007-09-29 02:55:39 · 1 answers · asked by Miguel Angel V 1

2007-09-29 02:53:58 · 2 answers · asked by Aj 1

2007-09-29 02:37:01 · 12 answers · asked by Anonymous

Why does a mirror invert left and right but not top and bottom?
i mean, it doesn't know that it should only invert left to right and not the other.......... so you got an explanation?

2007-09-29 02:23:13 · 5 answers · asked by puregenius_91 3

for example initial z=6 e=6 n=8 after alpha z=4 e= 6 n=6, so there would be a -2 charge assuming C-14 has alpha reaction

2007-09-28 21:20:27 · 2 answers · asked by Anonymous

A constant force of 3.1 N to the right acts on a 17.6 kg mass for 0.43 s. what is the final velocity? Find the final velocity of the mass if it is initially moving along the x-axis with a velocity of 2.02 m/s to the left.

2007-09-28 18:01:24 · 3 answers · asked by Roxana R 1

1)Mass curves space-time around it......but is it not possible to some-how fold the space-time in the form of a SPHERE at a place such as a sort of folding space-time,so if person named Michael WHO died 2yrs. ago,can return back to our present?? if its so wouldn't it cause any paradox?
QUESTION 2) If we consider QUANTUM TUNNELING,particles cross energy barrier even though they don't have that amount of energy to do that...may be that the particles take a short-cut through space-time using something called wormholes(though only theoritical) because in the Cs vapour experiment the wave emer5ged 20feets away FROM T HE OTHER SIDE IN AN "INSTANT" SUGGESTING thast it travelled faster than light in the chamber....but maybe a wormhole connnected from one side of the chamber to the other side of the chamber..maybe Cs vapours at a particular cond. of PVT open up certain miniature wormholes around US?

2007-09-28 17:42:42 · 4 answers · asked by Swapnil B 2

Limit definition in book is

F(x) is said to converge to L, as x approaches a, if and only if for every epsilon > 0 there is a delta > 0 such that

0 < |x-a| < delta implies |f(x) - L| < epsilon.

is the value of delta always presumed to be less than 1? because the book makes this assumption repeatedly when proving existence of limits in certain functions. Let me know

2007-09-28 17:04:49 · 3 answers · asked by Anonymous

2007-09-28 16:33:24 · 7 answers · asked by kntagler 1

2007-09-28 16:29:59 · 2 answers · asked by kntagler 1

Does sound really choose the path which requires the least time, like light?

2007-09-28 15:59:07 · 1 answers · asked by Frances 2

2007-09-28 15:37:53 · 3 answers · asked by Nick 2

An elevator with a weight of 27.9 kN is given an upward acceleration of 1.68 m/s2 by a cable.

(a) Calculate the tension in the cable.
_________ N
(b) What is the tension when the elevator is decelerating at the rate of 1.68 m/s2 but is still moving upward?
____________N

Can anyone help me start and help me work through this? I am just having trouble with it in general.

2007-09-28 15:17:48 · 2 answers · asked by eggyu74 3

2007-09-28 15:06:48 · 11 answers · asked by jacks_insanity 3

if an car is able to acceralate at a rate of about 1.6m/s^2 how long does it take to acceralate from 80km/h to 110km/h

2007-09-28 14:53:42 · 3 answers · asked by Anonymous

find the average speed and average velocity of a complete round trip in which the outgoing 250km is covered at 95 km/h, followed by a 1 hour lunch break. and return 250km is covered at 55km/h.

2007-09-28 14:50:47 · 1 answers · asked by Anonymous

2007-09-28 14:39:21 · 4 answers · asked by oninski 1

2007-09-28 14:15:44 · 4 answers · asked by Anonymous

I have been searching but I don't know if it is the gamma rays released during the nuclear fission or if it comes from another heat source during fission if not what?

2007-09-28 14:14:42 · 3 answers · asked by Anonymous

A skater stands at rest in a skating rink, and throws a baseball (m = 0.15 kg) at a speed of 35 meters per second. If the their mass is 50 kg, and if you neglect friction, what recoil velocity will the skater have?

2007-09-28 13:35:01 · 3 answers · asked by Caramel 2

A train traveling at a constant speed rounds a curve of radius 300 m. A chandelier suspended from the ceiling swings out to an angle of 16.5° throughout the turn. What is the speed of the train?

2007-09-28 13:26:26 · 1 answers · asked by Nikita 1

how fast im mph would i go if I am 140lbs and fell for 4 seconds in a vacuum?

2007-09-28 13:21:14 · 2 answers · asked by dave d 2

please help me to do this question ;) thanks

2007-09-28 13:13:44 · 2 answers · asked by Nikita 1

i dont want any text book anwer to this , if your going to dont bother. i want to think out of the square a bit. so could they be the some thing just different size models. like one thing people say they cant be is ones governed by electro magnetic energy and the other by gravity but too do the comparison proply you have to speed up the planets and if you spead them up say too a trillion times or how much it had to be wouldnt gravity look alot like electro magnitic energy? what i really want to know about is that speed conversion cuz i dont think people take that into account when they think about the comparison. or do they?

2007-09-28 12:15:15 · 6 answers · asked by Anonymous

Since lead is more dense than water, and the density of a substance will always be the same no matter what size, than (1)how come a very small piece of lead can float on water????
(2)Is this only because of surface tension? Or is there more?

(3) Is density the only key to whether or not a substance will float in the presence of another, or is the bouyant force totally different than just density?!?!?!?!

2007-09-28 12:05:43 · 4 answers · asked by Upon this rock 3