Physics - August 2007

Explain fully, including all assumed values

2007-08-27 10:04:22 · 2 answers · asked by dosad2004 2

2007-08-27 09:51:55 · 6 answers · asked by Anonymous

2007-08-27 09:46:33 · 4 answers · asked by Anonymous

1.assuming that the period of vibration of a tunning fork depends upon the lenght of the prong and on the density and young's modulus of the material,find by method of dimensions,a formula for the period of vibration[define young's modulus y=stress/strain=(force/area)(extension/original lenght).

2.assuming that the critical velocity vc of a viscous liquid flowing through a capillary tube depends upon the radius 'a' of the tube,the density p and the coefficient of viscosity n of the liquid,obtain a relation between vc,p,a and n.[define coefficient of viscosity n as: force/area times (velocity/displacement).

2007-08-27 09:32:44 · 2 answers · asked by dovey 2

Since the universe is expanding at much less than the speed of light (which our observations say that it is), and we started from a single infitesimal point of existence (the Big Bang), then how come we can see light from billions of years ago? Shouldn't that light have passed us long ago?

2007-08-27 09:29:16 · 6 answers · asked by Anonymous

I remember my mother telling me this as a child but cant understand why this is true. Please help!

2007-08-27 09:27:22 · 3 answers · asked by coolbeankatie 1

>==B==>. . . . . 1km. . . . . >==A==>

At time t=0 both ships inginte their motors.
Both ships are identical and their motors provide constant proper acceleration a=10m/s².

What is relative velocity of the starships (as seen by their captains), when they reach half speed of light v = c/2?

2007-08-27 09:25:10 · 7 answers · asked by Alexander 6

2007-08-27 09:08:27 · 3 answers · asked by Anonymous

2007-08-27 08:49:22 · 7 answers · asked by Wonder 2

What will happen aboard the ship after (proper) time t = c/g, when the ship will 'break' the speed of light barrier?

2007-08-27 08:32:59 · 3 answers · asked by Alexander 6

where it is electrically accelerated .It emerges with velocity v = 4.10 106 m/s. What was its acceleration, assumed constant? (Such a process occurs in old-fashioned television sets.)

2007-08-27 08:29:27 · 1 answers · asked by Wonder 2

PLEASE HELP

NASA has developed Deep-Space 1 (DS-1), a spacecraft that is scheduled to rendezvous with the asteroid named 1992 KD (which orbits the sun millions of miles from the earth). The propulsion system of DS-1 works by ejecting high-speed argon ions out the rear of the engine. The engine slowly increases the velocity of DS-1 by about 19.0 m/s per day.

a) How much time (in days) will it take to increase the velocity of DS-1 by 13400 m/s?

(b) What is the acceleration of DS-1 (in m/s2)?



The left ventricle of the heart accelerates blood from rest to a velocity of +25 cm/s

(c) If the displacement of the blood during the acceleration is +2.0 cm, determine its acceleration (in cm/s2).

(d) How much time does it take for the blood to reach its final velocity?


Starting from rest, a speedboat reaches a speed of 2.2 m/s in 2.2 s.

(e)What is the boat's speed after an additional 2.3 s has elapsed, assuming the boat's acceleration remains the same?

2007-08-27 08:28:55 · 1 answers · asked by atlz1anonly 1

Can someone please provide a step by step explanation of how you integrate

a= dv/dt

to get v = u + at



please can you explain exactly what your doing because i really dont follow this.


thanx =] x

2007-08-27 08:22:35 · 2 answers · asked by Anonymous

2007-08-27 07:47:27 · 10 answers · asked by Alexander 6

The Earth rotates eastward at speed s=500m/s at equator. Airplane flies in due west direction along equator at speed v=s=500m/s wrt earth.

********
When I do this problem in the frame of refence rotating with the earth, then:

forces acting on the plane are:
gravity mg (downwards)
centrifugal force mω²R = ms²/R (upwards)
airlift F (upwards)

dynamic equation for the airplane is
ma = F - mg + ms²/R
Accleration a is centripetal accleration:
a = -v²/R (minus signifies downward direction)
Final equation for airlift:
****************
F = m(g - 2s²/R)
****************

But when I consider this problem in inertial frame of reference, the airplane is at rest, and I get simply
****************
F = mg
****************

2007-08-27 07:18:39 · 4 answers · asked by Alexander 6

♥ I placed a bowl of ice cream very gently on the ground and suddenly the glass bowl shattered! Can you explain this?

Is there any scientific reasoning behind this event. I understand that this incident is not significant, however, I would just like to comprehend the reasoning behind it.

Thank you to all! ♥

2007-08-27 07:06:39 · 18 answers · asked by Nicole S 2

2007-08-27 05:59:29 · 11 answers · asked by Anonymous

2007-08-27 05:23:12 · 8 answers · asked by Anonymous

... Given the expantion of gasses happens on a flat surface and under ideal conditions.. excluding air resistance and energy absorbed by the ground. Lets use a Radius of 10 meters.

2007-08-27 04:47:56 · 3 answers · asked by dtroupe2 2

2007-08-27 04:31:15 · 28 answers · asked by GEETA P 1

Curious amateur photographer located at (0E, 30N) noticed a bright object rising over the horizon, and made a picture of its trajectory.
He directed his camera horizotally due south, and let exposition continue until the object fell under horizon. The trace of the projectile on the film is

a) parabola
b) ellipse
c) hyperbola
d) impossible to predict

2007-08-27 04:29:39 · 1 answers · asked by Alexander 6

What is the ratio of Coriolios force acting on the Moon (from the point of view of observer on Earth) to the force of Earth gravity acting on the Moon?

Data:
One revolution of Earth: 24 hours
One revolution of Moon: 28 days
One revolution of low-orbit satellite: 85 minutes

2007-08-27 04:24:24 · 3 answers · asked by Alexander 6

as there are many gases in air . then we should feel the pressure on our body but we don't. why?

2007-08-27 04:18:46 · 13 answers · asked by Anonymous

1.) A 1.00kg object is observed to have an acceleration of 10.0m/s^2 in a direction 30.0° north of east. The force F2 acting on the object has a magnitude of 5.00N and is directed north. Determine the magnitude and direction of the force F1 acting on the object.

2.) A frictionless plane is 10.0m long and inclined at 35.0° . A sled starts at the bottom with an initial speed of 5.00m/s up to the incline. When it reaches the point at which it momentarily stops, a second sled is released from the top of this incline with an initial speed vf. Both sleds reach the bottom of the incline at the same moment. (a) Determine the distance that the first sled traveled up the incline. (b) Determine the initial speed of the second sled.

2007-08-27 03:17:14 · 1 answers · asked by Anonymous

2007-08-27 02:12:36 · 10 answers · asked by Anonymous

2007-08-27 00:36:59 · 4 answers · asked by helpinghand 2

2007-08-27 00:24:01 · 2 answers · asked by Maria Margarita C 1

If Einstein is the greatest scientist in 21st century then why did he fail in the 8th grade???

2007-08-27 00:21:39 · 12 answers · asked by ♠The Boss♠ 4

aside from satellite please. ten points

2007-08-27 00:04:30 · 8 answers · asked by helpinghand 2

2007-08-26 23:11:47 · 1 answers · asked by Anonymous