Physics - March 2007

2007-03-21 12:10:45 · 14 answers · asked by Anonymous

A 3.00-kg mass is fastened to a light spring that passes over a pulley. They pulley is frictionless, and its inertia may be neglected. The mass is released from rest when the spring is unstretched. If the mass drops 10.0cm before stopping, find (a) the spring constant of the spring and (b) the speed of the mass when it is 5.00cm below its starting point.

i got part A..but i dont understand how to do B..so can someone please teach/show me how to do it. that would be great.

2007-03-21 12:06:36 · 2 answers · asked by Becky 2

2007-03-21 12:05:18 · 7 answers · asked by Crystal D 1

Will there be a voltage across the wings?
Would it matter if the airplane flighs west/east or south/north?

Thanks!

2007-03-21 11:58:59 · 2 answers · asked by hotmail.stinks 1

Why does the Stern-Gerlach experiment show that the operator "measure the z component of the magnetic moment of an Ag atom" has only two eigenfunctions with eigenvalues that have the same magnitude and opposite sign?

2007-03-21 11:53:54 · 1 answers · asked by Anonymous

2007-03-21 11:32:14 · 1 answers · asked by JAMES 4

from lab involving spinning a stopper on string with varying dangling mass...

briefly explain the relationship between the centripetal force an the amount of hanging weight.

2007-03-21 11:32:08 · 5 answers · asked by frank8712000 1

F=100 M=? A=65mph what does mass equal

2007-03-21 11:27:26 · 5 answers · asked by Anonymous

Really now. I don't think there is, but does anyone know better?

2007-03-21 11:26:02 · 8 answers · asked by Anonymous

2007-03-21 11:23:31 · 5 answers · asked by Crystal D 1

I know glass can capture a lot of heat. They say cars in the sun can hit 150 degrees. And I've seen systems where they get glass boxes up to 700 degrees (with nothing but sunlight).

So whats the problem with a glass hot air balloon (other than structural)? It wouldn't need fuel if you painted the bottom with black paint to catch heat.

2007-03-21 11:10:36 · 4 answers · asked by imajiknation 2

A 5.0 kg block at rest on a frictionless surface is acted on by forces. F1+5.5 N and it is a girl pushing on the block with a 30 degree angle. The second force is F2=3.5 N and is a boy pulling on it with a 37 degree angle. What additional force will keep the block at rest?

2007-03-21 10:33:42 · 3 answers · asked by Anonymous

Both sizes being constructed of the same material.

2007-03-21 09:40:52 · 5 answers · asked by rico3151 6

2007-03-21 09:32:22 · 4 answers · asked by the man 1

With an electron in the state n=4, l=3, m=2, s=1.
In what shell is this electron located?
In what subshell is this electron located?
How many other electrons could occupy the same subshell as this electron?
What is the orbital angular momentum of this electron?
What is the z component of the orbital angular momentum of this electron, ?
What is the z component of the spin angular momentum of this electron, ?

2007-03-21 09:22:11 · 2 answers · asked by Hankes07 1

The term "progressive collapse" seems to have come into vogue after 9/11 as a way of explaining how WTC 1, 2, & 7 collapsed. However, I have yet to see any natural or even man-made small scale examples of this phenomena. Can somebody please provide me with a real world example of a progressive collapse that can be reproduced in a laboratory on a small scale? More precisely, can someone show me how one object can gravitationally move through another object of equal or greater mass at or near free fall speed? Please try to avoid using the collapse of building structures such as WTC 1, 2, & 7 as examples.

2007-03-21 09:20:37 · 4 answers · asked by eloy_gonzalez_2 1

as the tempature of a metal conductor is reduced the resistance of the conductor will
increase
decrease
stay the same

conductivity in ionized gases depend upon
free electron
negativity ions only free electrons
positive ions only
postive ions and negative ions

2007-03-21 08:41:19 · 3 answers · asked by Anonymous

1. set the balancing holder at the 40 cm mark and placed the mass of 200g at the 20 cm mark. After that, we placed the unknown weight on another holder and adjusted its position on the ruler until we got the ruler horizontal balance. the ruler = 1m long and its weight is 150g. Find the unknown mass?

2. (Ruler = 1m long) set the balancing holder at the 25 cm mark of the ruler and placed the mass of 200g on the weight holder on the ruler in order to make the ruler balanced horizontally, and this position was 16cm. Find the mass of the ruler

2007-03-21 08:27:24 · 1 answers · asked by Anonymous

Please state your sources

2007-03-21 08:16:19 · 6 answers · asked by Rosalie Cullen 2

Liquid is poured from a jar from top of a building
h = 20m high into a bathtub on the ground.

If a loudspeaker in the bathtub 'beep's, how much time
will it take for the sound to propagate to a microphone
inside the jar?

http://alexandersemenov.tripod.com/water/index.htm

Speed of sound in liquid is s = 30 m/s.
Assume that sound propagates through liquid only.

2007-03-21 08:01:50 · 5 answers · asked by Alexander 6

2007-03-21 07:42:20 · 9 answers · asked by researchtissue 5

A 21.2 ohm resistor is connected to a 11.8 V battery. What is the current in the circuit? How much thermal energy is produced in 21.9 min? Answer in units of J.

I figured out the first part of the question using I = V/R. So, for the next part, I have a value for resistance, voltage potential, and current. I'm also given a time. Unfortunately, I have no idea where to move from here. I assume the thermal energy has something to do with electric power, but I can't really grasp how time is a factor. Any help would be appreciated.

2007-03-21 07:40:50 · 4 answers · asked by mmrage318 1

A physics student, bored by a lecture on simple harmonic motion, idly picks up his pencil (mass 9.2g, length 17cm ) by the tip with his frictionless fingers, and allows it to swing back and forth with small amplitude.If the pencil completes 6279 full cycles during the lecture, how long does the lecture last?

2007-03-21 07:36:11 · 6 answers · asked by T.K 1

I cannot figure out the answer. The question is "What force should a winch exert on a 900 kg box to keep it moving at a constant rate if kinetic coefficient of friction is .61?" If you could also explain how you got the answer it would be greatly appreciated. Thanks!

2007-03-21 07:26:28 · 5 answers · asked by Holden F 2

2007-03-21 07:25:03 · 3 answers · asked by Vinayak k 1

lol

2007-03-21 07:24:07 · 15 answers · asked by Anonymous

2007-03-21 07:13:56 · 4 answers · asked by Anonymous

...loose, and he has drifted out of reach of the craft. How could he use his spanner to help him ge back to the craft?

Please help, physics question on forces and momentum.

2007-03-21 07:08:30 · 7 answers · asked by billymardle 1

It can be a rocket, car, plane, etc......but it has to be the fastest ever recorded on earth. There is only one answer but I don't know what sort object did it.

2007-03-21 06:39:58 · 11 answers · asked by bryan_hemmer 2

A 17.9 ohm ­ and a 20.6 ohm ­ resistor are connected
parallel. A difference in potential of 47.9 V is
applied to the combination.

a)What is the equivalent resistance of the
parallel circuit? Answer in units of ­ohms.

b)What is the current in the circuit? Answer in
units of A

c)How much current passes through the 17.9 ohm ­
resistor? Answer in units of A.

2007-03-21 06:38:39 · 5 answers · asked by kpm0729 1