Physics - November 2006

2006-11-06 19:00:48 · 2 answers · asked by krishna s 2

2006-11-06 18:51:56 · 5 answers · asked by travelpa 7

2006-11-06 18:23:13 · 8 answers · asked by chica 2

2006-11-06 18:18:23 · 18 answers · asked by Live & Let Live! 1

I clearly am misunderstanding a fundamental principal here. As far as I know sound needs a medium such as air or water to travel. While light only gets distorted by traveling though something. Yet I know that communication is space is possible.

So is it that the signal of radio is more like light than sound in that it needs no medium or am I completely lost on this concept?

2006-11-06 17:56:00 · 8 answers · asked by Gamla Joe 7

In the first law of motion by Issac Newton it says that if something
is moving in constant motion then it is considered straight movement because if you were to put it on a graph it is linear.
So if an object is moving in constant motion or in the same way without interferance then it is straight right.My friend says that the
object HAS to travel in a straight line for it to be straight.Me I
just said that the velocity has to be good and that even if a object
is going in a circle and the speed is constant it can apply.So
he is saying that in the first part of the Law when Issac says
that an object in motion will stay in motion or in a constant way
or constant speed in a straight line does it mean straight line
as in it literally goes straight or its speed is constant and
it can go in a circle?

I might not be correct so please tell me if I am right or wrong.

2006-11-06 17:11:10 · 14 answers · asked by Anonymous

In other words, the general relativity theory he discovered, doesn't it, mean that there was a beginning? and not an infinite series

2006-11-06 17:04:40 · 5 answers · asked by Anonymous

A particle of mass 0.52 kg is attached to
the 100-cm mark of a meter stick of mass
0.21 kg. The meter stick rotates on a horizon-
tal, frictionless table with an angular speed of
1.7 rad/s.
Calculate the angular momentum of the
system when the stick is pivoted about an
axis perpendicular to the table through the
50-cm mark.

2006-11-06 16:59:16 · 2 answers · asked by askance 4

what is it caused from?
is it energy?

2006-11-06 16:54:25 · 14 answers · asked by Suide 1

2006-11-06 16:50:52 · 6 answers · asked by naenae 1

Assume a spaceship is traveling directly towards you at a constant speed of half the speed of light and you are able to observe a clock on board the spaceship using a telescope. What would you actually see. Would you see the clock moving faster or slower than your own, and by how much?

2006-11-06 16:28:08 · 3 answers · asked by heartsensei 4

partscoretotalsubmissions1--10/10A car (mass = 1130 kg) is traveling at 35 m/s when it collides head-on with a sport utility vehicle (mass = 2210 kg) traveling in the opposite direction. In the collision, the two vehicles come to a halt. At what speed was the sport utility vehicle traveling?

2006-11-06 16:19:33 · 5 answers · asked by Alan l 1

A student (m = 63 kg) falls freely from rest and strikes the ground. During the collision with the ground, he comes to rest in a time of 0.0120 s. The average force exerted on him by the ground is +16000. N, where the upward direction is taken to be the positive direction. From what height did the student fall? Assume that the only force acting on him during the collision is that due to the ground.

2006-11-06 16:18:46 · 3 answers · asked by Alan l 1

It is common knowledge that atoms do not touch one another, they rather orient themselves into electromagnetic alignments of form and patterns. so what we appear to touch is but the electromagnetic-field signature of that pattern. So then what is real?

2006-11-06 16:06:31 · 5 answers · asked by Anonymous

A 55 kg swimmer is standing on a stationary 230 kg floating raft. The swimmer then runs off the raft horizontally with a velocity of +4.6 m/s relative to the shore. Find the recoil velocity that the raft would have if there were no friction and resistance due to the water.

2006-11-06 15:44:21 · 2 answers · asked by Alan l 1

49. A 3.50 g bullet is fired horizontally at two blocks at rest on a frictionless table. The bullet passes through block 1 (mass 1.20 kg) and embeds itself in block 2 (mass 1.80 kg). The blocks end up with speeds v1 = 0.630 m/s and v2 = 1.40 m/s. Neglecting the material removed form block 1 by the bullet,
Find the speed of the bullet as it:
(A) leaves and
(B) enters block 1.

The answers are:

(A) 721 m/s
(B) 937 m/s

But I don’t know how to get these answers, please help me!

2006-11-06 15:37:04 · 5 answers · asked by afchica101 1

2006-11-06 15:25:36 · 7 answers · asked by Anonymous

I need to know by tonight!!! Thanks for being so helpful!

2006-11-06 15:18:46 · 3 answers · asked by pupluver 1

2006-11-06 15:12:21 · 7 answers · asked by Anonymous

2006-11-06 14:51:53 · 7 answers · asked by sara k 1

2006-11-06 14:25:03 · 5 answers · asked by Anonymous

I watch star wars. How does lightsaver work? Is it possilbe to shot out energy like that and suddenly stop at about 1m? Is it possible to keep the energy beam like that in an open air? Also when the lightsaver hit other lightsaver how come it doesn't go thought? aren't they energy waepon not physical weapon with mass?

2006-11-06 14:24:23 · 8 answers · asked by jason 1

I heard there is many different way to get very close to light speed, even though theoretically mass traveling at speed of light is impossible. For example using matter anti-matter engine and cause continuous explosions would eventually accelerate up to velocity that is just under light speed. Ok here is what I don't know about. In this science fiction I read. As velocity increse the mass will increase, so when it get to near light speed the mass will increase up to even mass of saturn and go on. In this sf novel that I read. Space military used matter anti matter engine equipped missil to enemy planet to make gaint hole on thier planet or make the missil go fast as possible and increase mass so that it will become blackhole near enemy. Is it true that as velocity increase mass increase?

2006-11-06 14:18:42 · 7 answers · asked by jason 1

(a) How many seconds was the rock in the air?
(b) How far out from the base of the cliff does the rock land?

2006-11-06 14:17:54 · 7 answers · asked by Anonymous

A soccer player kicks a soccer ball of mass 0.45 kg that is initially at rest. The player's foot is in contact with the ball for 3.0 x 10^-3 seconds, and the force of the kick is given by:
F(t) = [(6.0 x10^6)t - (2.0 x10^9)t^2] N
for 0 <_ t <_ 3.0 x10^-3 seconds, where t is in seconds. Find the magnitudes of:
(A) The impulse on the ball due to the kick.
(B) The average force on the ball from the player's foot during the period of contact.
(C) The maximum force on the ball from the player's foot during the period of contact.
(D) The ball's velocity immediately after it loses contact with the player's foot.

The answers are:
(A) 9.0 kg x m/s
(B) 3.0 kN
(C) 4.5 kN
(D) 20 m/s

But I don't know how to get these answers, please help Me!

2006-11-06 14:13:20 · 1 answers · asked by gods1princesschanel 1

A balll of mass m=60 g is shot with speed vi=22 m/s into the barrel of a spring gun of mass M= 240 g initially at rest on a frictionless surface. The ball sticks in the barrel at the point of maximum compression of the spring. Assume that the increase in the thermal energy due to friction between the ball and the barrel is negligible.

(A) What is the speed of the spring gun after the ball stops in the barrel?

(B) What fraction of the initial kinetic energy of the ball is stored in the spring?

The answers are:

(A) 2.35 x 10^3 J

(B) 352 J

But I don't know how to get these answers, please help me!

2006-11-06 14:06:00 · 1 answers · asked by gods1princesschanel 1

If I see some science fiction movies like matrix, there are these snti gravity drivers. I heard theoretically it is impossible. But some people say it is possible to make anti gravity engine by rotaing it greater than 5000rpm and generate electromagnetic field.

2006-11-06 13:55:00 · 8 answers · asked by jason 1

a crayon?
a car?
a book?
a computer?

2006-11-06 13:50:55 · 9 answers · asked by Anonymous

A ball is dropped from the top of a 40 m high building. At what INITIAL VELOCITY must a second ball be throw from the top of the building 2.00 s later, such that both balls arrive at the ground at the same time??

Givens...
delta y = -40m
initial velocity of 1st ball = 0 m/s (dropped)

Needs...
initial velocity of second ball = ???


I have no idea on how to do this?!?! i think i have to make two equations equal to each other but i dont think i can because the second ball came 2 seconds later. Please help.



delta x = (Vix)(t)
Vix= Vi cos(pheta
Vy(final velocity) = Viy -gt
delta y = viyt - 1/2gt^2
Vy^2 = Viy^2-2g(delta y)
Viy = Vi sin(pheta

2006-11-06 13:47:06 · 4 answers · asked by Alex M 1

Could someone please explain, how is entropy related to probability?

2006-11-06 13:46:45 · 2 answers · asked by miledi111 1