Physics - March 2007

2007-03-06 00:48:04 · 8 answers · asked by Anonymous

work done in raising a stone of mass 4kg , specific gravity 4 , immersed in water from a depth of 3m to 1m below the surface is-
a)58.8J b)49.6J c)11.7J d)97.3J
THE ANSWER IS (a)58.8J ............ but how???

2007-03-06 00:20:51 · 5 answers · asked by Anonymous

2007-03-06 00:19:24 · 1 answers · asked by Eloisa Q 1

2007-03-06 00:17:41 · 5 answers · asked by jagadish 1

Could you explain also how you found the answer please so that i know how to find the answer on other density questions.

2007-03-06 00:15:02 · 4 answers · asked by anarchygirl 1

How could you identify a pure metal if you have a balance, a graduated cylinder, and a table of densities for metals?

2007-03-06 00:08:52 · 3 answers · asked by Anonymous

2007-03-06 00:02:04 · 8 answers · asked by jagadish 1

like sin i /sin r

2007-03-05 23:53:52 · 2 answers · asked by Anonymous

2007-03-05 23:45:50 · 7 answers · asked by Anonymous

2007-03-05 22:58:40 · 5 answers · asked by *nice gurl* 1

it's easy question..

2007-03-05 22:54:33 · 2 answers · asked by *nice gurl* 1

2007-03-05 22:32:24 · 9 answers · asked by Sedash 1

if you are in a car and you where traveling at the speed of light and you turned the head light on what would happen, would you see the light. the best answer will get 10 points.

2007-03-05 22:16:07 · 22 answers · asked by Anonymous

pls give me a nice answer... it`s for my physics folio...pls..

2007-03-05 22:11:14 · 2 answers · asked by kimmmy 1

2007-03-05 21:42:23 · 10 answers · asked by karthik S 1

2007-03-05 21:23:09 · 10 answers · asked by ambili 1

I am making a solar still with a half spilt cylinder(cut trash can.....). Does this mean i'm applying a parabolic reflector to my solar still? What color should i use to paint my solar still(including inside and outside) and why ? You can also please suggest me improvements that can be done to my solar still?

2007-03-05 21:09:48 · 1 answers · asked by 47 2

This is for physics people...

2007-03-05 20:22:35 · 3 answers · asked by AnAmericanGuywholivesinJapan 1

an energy efficient air conditioner draws 7 amps in a standard 120 volt circuit. it cost $40 more than a standard air conditioner that draws 12 mps. if electricty cost 8 cents per kilowatt hour, how long would you have to run the efficient air conditioner to recoup the difference in price.

2007-03-05 20:22:14 · 2 answers · asked by El 1 1

2007-03-05 19:46:03 · 5 answers · asked by smile4me 1

The engine in an imaginary sports car can provide constant power to the wheels over a range of speeds from 0 to 70 miles per hour (mph). At full power, the car can accelerate from zero mph to 29.0 mph in time 1.20s .

At full power, how long would it take for the car to accelerate from 0 to 58.0 mph? Neglect friction and air resistance.

So I'm under the impression that I need to a use a relation between power and energy, and energy and velocity....

I've determined the velocity to be 1.3 m/s. Only problem now is that the only way I can connect the formulas is through mass, which is not given. Any ideas?

2007-03-05 19:43:30 · 3 answers · asked by Dathan C 2

2007-03-05 19:36:28 · 3 answers · asked by farah z 1

vector A has a magnitude of 188units and points at an angle 30 north west.vector B points an angle of 50 north east.vector C points at an angle of 20 south west.the 3 vectors add to give a resultant vector that is zero.using components ,find the magnitudes of vectors B and C

2007-03-05 19:29:19 · 2 answers · asked by trick*star 1

2007-03-05 19:17:29 · 8 answers · asked by Anonymous

A uniform board of length L and mass M lies near a boundary that separates two regions. In region 1, the coefficient of kinetic friction between the board and the surface is (mu1), and in region 2, the coefficient is (mu2). The positive direction is shown in the figure.

http://session.masteringphysics.com/problemAsset/1011078/29/MWE_cw_5_a.jpg

Find the net work W done by friction in pulling the board directly from region 1 to region 2. Assume that the board moves at constant velocity.
Express the net work in terms of M,g ,L ,mu1 , and mu2.

I would really appreciate help with this one guys, I keep getting it wrong :( Thanks in advance!

2007-03-05 19:14:03 · 5 answers · asked by Anonymous

please name them. keep it brief and simple, this is for homework.

2007-03-05 18:50:33 · 1 answers · asked by Anonymous

is perpendicular to a magnetic field of 0.63 T pointing up. During the course of 0.25 s, the field is changed to one of 0.25 T pointing down. What is the average induced emf in the coil? mV


Can anyone offer any help for this one??

2007-03-05 18:32:06 · 2 answers · asked by Jade m 1

2007-03-05 18:28:49 · 8 answers · asked by Parth M 1

How it is derived? What is the origin of that theory? Any site/link that you can provide?

2007-03-05 18:07:51 · 1 answers · asked by Optics 2

ok, i'm stuck with this problem and I have to use a website to turn in the answer that is limited to say if it is right or wrong, which doesn't help me at all.

A uniform board of length L and mass M lies near a boundary that separates two regions. In region 1, the coefficient of kinetic friction between the board and the surface is ų1, and in region 2, the coefficient is ų2. The positive direction is shown in the figure.

http://session.masteringphysics.com/problemAsset/1011078/29/MWE_cw_5_a.jpg

Find the net work W done by friction in pulling the board directly from region 1 to region 2. Assume that the board moves at constant velocity.
Express the net work in terms of M, g, L, ų1, and ų2.

Any ideas? Thank you in advance.

2007-03-05 18:02:26 · 3 answers · asked by Sergio__ 7