Physics - April 2007

2007-04-13 04:11:42 · 3 answers · asked by Bramble 7

A coil is wrapped with 474 turns of wire on
the perimeter of a circular frame (of radius
28 cm). Each turn has the same area, equal
to that of the frame. A uniform magnetic
field is directed perpendicular to the plane of
the coil. This field changes at a constant rate
from 29 mT to 69 mT in 31 ms.
What is the magnitude of the induced E in
the coil at the instant the magnetic field has a magnitude of 51 mT? Answer in units of V

2007-04-13 04:00:42 · 2 answers · asked by cjtc 1

Using general sine formula, I derived a function that fit the curve of the tidal heights changes over a period of 24h. As you might know, Moon comes out every day 50min later than day before, and therefore, there is a small shift (C) in the next day. On the 3rd day, shift is going to be 2XC, on 4th 3XC and so on. Therefore, the first function, that fit the 1st day, due to all those new and increasing shifts, won't fit exactly any of the curves in the future.

Is there a function (something similar to the sequence principal?) that could follow the the tidal curve over longer period of time, and I mean, a general one, since I don't want to deduce 10th day by obtaining 9 days before :)

Any kind of help would be extremely useful, since I'm not that level of math yet:) and you should know something about that how Moon affects Earth also...I guess. You can also include any useful links you think I should look at. Thanks:)

2007-04-13 03:58:51 · 2 answers · asked by Kaja 2

A solenoid 8.6 cm in radius and 82 m in length
has 13700 uniformly spaced turns and carries
a current of 3.1 A. Consider a plane circular
surface of radius 1.5 cm located at the center
of the solenoid with its axis coincident with
the axis of the solenoid.
What is the magnetic flux through this
circular surface?(1Wb = 1Tm^2) Answer in
units of Wb.

2007-04-13 03:58:34 · 1 answers · asked by cjtc 1

A) your ear
B) your foot
C) your hand
D) your nose

2007-04-13 03:22:13 · 13 answers · asked by puppy love 1

2007-04-13 03:16:12 · 9 answers · asked by Anonymous

2007-04-13 03:13:37 · 5 answers · asked by Anonymous

2007-04-13 02:51:45 · 2 answers · asked by Anonymous

If we are willing to pay the price of going to the the moon to get it:-

http://www.bbc.co.uk/sn/tvradio/programmes/horizon/broadband/tx/moonsale/

it will be fusion reactors all round won't it?

Or will we have World War III squabbling over who has right to what?

Isn't it worth getting it right this time, because fusion power will give clean and virtually limitless energy for everybody - 'we can have our cake and eat it' this time can't we?

2007-04-13 02:51:09 · 2 answers · asked by Anonymous

2007-04-13 02:20:30 · 8 answers · asked by manishapannu 1

I have to give one reason why a floppy disk which contains data on a magnetic disk should not be left in the sun...any help pls??

2007-04-13 00:37:12 · 4 answers · asked by Anonymous

I need to explain why the gravitaional force on the moon is different from that on earth. Can anybody help me plssss..only a short statement is needed

2007-04-13 00:26:36 · 11 answers · asked by Anonymous

2007-04-12 23:03:12 · 10 answers · asked by siva 1

2007-04-12 22:27:03 · 5 answers · asked by 2kool4u 5

I saw these TV programs (we get smart TV programs in the UK) where they say there may be billions of dimensions (a la the Everett interpretation of quantum mechanics). Then they go on to say there are eleven dimensions. Are they talking about different things? Why does this confuse me?

2007-04-12 22:12:51 · 6 answers · asked by 2kool4u 5

i sail and i am curious what the physics that powers sail boats is. i am in a physics course so i have a relatively good understnading of basic physics.

2007-04-12 21:08:28 · 4 answers · asked by Anonymous

If a pendulam clock is accurate at sea level, will it gain or lose time when taken to high altitude?
Please explain I have a test on this thing.......

2007-04-12 19:33:03 · 3 answers · asked by Anonymous

When I weigh myself on a scale, it tells me for example I'm 75 kg. The Kilogram is a unit for mass. However, we know that the scale reads the weight (whose unit would be Newton). Do I weigh 75x10=750 Newton? or 75 Newton?

2007-04-12 19:29:55 · 6 answers · asked by Young Guy 2

Alpha particles are more ionising. But gamma rays have more energy and can penetrate deeper.
Which one is more dangerous?

2007-04-12 18:57:14 · 8 answers · asked by Anonymous

An insulated beaker with negligible mass contains liquid water with a mass of 0.205 kg and a temperature of 67.9 C
How much ice at a temperature of -14.4 C must be dropped into the water so that the final temperature of the system will be 28.0 C?
Take the specific heat of liquid water to be 4190 J/kGK , the specific heat of ice to be 2100 J/kGK , and the heat of fusion for water to be 334 kJ/kG.
mass = kG

2007-04-12 17:53:37 · 1 answers · asked by Anonymous

A steel ball is dropped from a building's roof and passes a window, taking 0.125 s to fall fromt he top to the bottom of the window, a distance of 1.20m. It then falls to a sidewalk and bounces back past the window, moving from the bottom to top in 0.125 s. Assume that the upward flight is an exact reverse of the fall. The time the ball spends below the bottom of the window is 2.00 s. How tall is the building?

2007-04-12 16:20:08 · 2 answers · asked by Danyal Ali 1

Deep sea retrieval operation. Object is to lower claw approx. 200 meters, acquire target, release ballast and float target to surface. No submersible vehicle available. No divers available. No choice as to what to use for flotation bodies. Empty propane tanks from gas grills. Have been unable to obtain data on crush depth. No opportunity to experiment. Must be done right first time. Anybody know?

If 'empty' (acetone-filled) acetylene tanks from welding are substituted for propane tanks, will crush depth be increased? Will lifting capability be increased?

2007-04-12 14:09:43 · 5 answers · asked by cdf-rom 7

2007-04-12 13:58:13 · 3 answers · asked by AlanG 3

Hey
So, you go back in time and kill your own father before you were born...what happens?! If you're his son, and you kill him before you're born, then you were never born, which would mean you couldn't of gone back in time to kill him.
Not looking for the answer, just the name for this situation. I know it's something scientific, but i just can't remember....any ideas?

2007-04-12 12:40:39 · 5 answers · asked by Phantom 2

Can someone help, my 7th grade cousin has this assignment and it is regarding a workup on the powerbill and we are using my powerbill?

On my powerbill the total kWh used this month is 222,
Days: 27, Avg KWh per Day is 8, & Avg Cost per Day is $0.87.
I needed some help doing some analysis.

To the nearest tenth of a cent, how much does 1 kWh cost?
-is that 0.087 cent?

I was trying to figure out in joules how energy i consume? Is there a formula and how do I do that?
-From my own research the answer I got was 799,200,000 J

Next, I wanted to find the average power consumption in Watts? (I am not sure what formula to use or how to go about this?

Also, the power company has noted that I am provided with 120 V? Based on the power consumption, what is the average current running in my house?

And in general, I was wondering how much would it cost me to leave all the lights on in the house for one day. I have 70 bulbs in my house that are all 75 watts?

Thanks!

2007-04-12 12:25:20 · 3 answers · asked by Anonymous

A high-speed lifting mechanism supports a 730 kg object with a steel cable 36.0 m long and 4.00 cm2 in cross-sectional area.
(a) Determine the elongation of the cable.
______________mm
(b) By what additional amount does the cable increase in length if the object is accelerated upward at a rate of 3.4 m/s2?
____________mm
(c) What is the greatest mass that can be accelerated upward at 3.4 m/s2 if the stress in the cable is not to exceed the elastic limit of the cable, 2.2 108 Pa?
_______________ kg

2007-04-12 11:57:27 · 2 answers · asked by Emma 1

If you were standing on a mountain, would you weigh more, less, or the same standing at sea level?? Why??

2007-04-12 11:10:46 · 17 answers · asked by ♥ Nichole[never gives up]♥ 5

2007-04-12 10:57:12 · 8 answers · asked by Libby 5

2007-04-12 10:33:07 · 6 answers · asked by Alice Cullen 4

An unstable particle at rest breaks up into two fragments of unequal mass. The mass of the lighter fragment is 2.40 x10-28 kg, and that of the heavier fragment is 1.64 x10-27 kg. If the lighter fragment has a speed of 0.893c after the breakup, what is the speed of the heavier fragment?
Thank you very much for any help you can give me on this question! I really appreciate it!

2007-04-12 10:18:11 · 2 answers · asked by Runaround Sue 1