Physics - March 2007

as it swings freely back and forth for a long period of time?

2007-03-04 14:35:49 · 1 answers · asked by scimatics 1

a carbon nanotube is very very small..abt ..so how do they hold it..?
and how do they put atoms in it for controlled reactions.i.e polymers dont branch
last q... is there a microscope with more resolution then electron microscope?

2007-03-04 14:33:03 · 1 answers · asked by Anonymous

examples and explain how they're compound.answer asap!!

2007-03-04 14:32:48 · 3 answers · asked by . 1

in the time when they are in line what way will the sun pull the earth..will it tilt it like it has done millions of years before,Are what If it pushed it after all it is magnitised and it is pos and neg.wow man what a rush..the sun pushed the earth out of orbit away from the astroid.. But
it sucked the earth into it's own orbit as-well
have you seen the old twilight zone shows..
the midnight sun............

2007-03-04 14:32:13 · 3 answers · asked by ashkicker420 3

In the picture, (Click on link for image)... what is the acceleration of the crate if the applied force is 330 N and the coefficient of kinetic friction is 0.45.

Angle of the applied force is 21 degrees with respect to the negative x-axis... the crate weighs 32 kg.

LINK FOR IMAGE: http://img.photobucket.com/albums/v156/PNHTran88/phys.jpg

Thanks!!

2007-03-04 14:30:09 · 1 answers · asked by 123haha 1

Hi can anyone help me out with physics homework?

I need to find out the resistance of 0.31 mm diameter constantan wire. Constantan wire has a resistivity of 49 x 10-8 and the length is 1000mm.

The second question is as above but with a length of 500mm.

I have the equation of = pL/A but I keep getting different answers not sure what I am doing?

Can you help me out? I dont know what I am doing!

Thank you

J

2007-03-04 14:27:59 · 2 answers · asked by shetajan 1

reference frame in which both planets are at rest. The twins, of the same age, depart at the same time on different spacecraft. Speedo's craft travels steadily at 0.970c, and Goslo's travels at 0.750c. Calculate the age difference between the twins after Goslo's spacecraft lands on Planet X.

2007-03-04 14:22:19 · 1 answers · asked by Ting 4

In a physics experiment, I used a diode connected in series with a protective resistor and measured the current and potential difference across it. Does anyone know why it's necessary to include this protective resistor when using a diode?

2007-03-04 14:11:56 · 1 answers · asked by KrazySweetie 4

2007-03-04 14:02:38 · 5 answers · asked by Anonymous

2007-03-04 14:01:34 · 11 answers · asked by stephanie t 1

A spring of negligible mass has force constant K= 1400.

Part A:

How far must the spring be compressed for an amount 3.20 of potential energy to be stored in it?

Part B:

You place the spring vertically with one end on the floor. You then drop a book of mass 1.20 onto it from a height of 0.700 above the top of the spring. Find the maximum distance the spring will be compressed.

2007-03-04 14:01:30 · 1 answers · asked by Superman 1

It has to do with the theory that when objects move through space, that the space bends to fit the object. I was watching the discovery channel. But then how does the 1 in 12 people understand this make sense if in brief terms it is that simple.

I'm only 13 too. Unless I am incorrect that pretty easy to understand.
Even though I've heard the theory has to do with things such as when you are in a car going 50 and you throw a baseball 50 mph out that the ball will be going 100mph momentarily.

2007-03-04 13:45:28 · 4 answers · asked by Drick 3

no mass is given

2007-03-04 13:24:12 · 1 answers · asked by Ting 4

2007-03-04 13:10:16 · 4 answers · asked by Anonymous

2007-03-04 12:39:56 · 9 answers · asked by Lala 3

In the late 1800's, Edwin A. Abbot wrote the mathematical tale FLATLAND. Please give a source?

2007-03-04 12:33:04 · 1 answers · asked by Jeremy J 1

2007-03-04 12:17:49 · 8 answers · asked by sheriefhalawa 2

in circles
ellipses
parallel to the direction of travel or
perpendicular to the direction of travel?

2007-03-04 12:13:41 · 4 answers · asked by sjl062484 1

Im not sure how to do these, any help? Thanks

a) sketch the situation and draw all the forces on the box.

I have 3 forces for this, is that all their is? I have one going up that the rope is putting on the box, and one that the box is putting on the rope, and then one that the gravity is putting on the box.

b) In 1.5s the box goes from rest to 2.5 m/s What is the magnitude of the tension in the rope? Is it greater than or less than the weight of the box?

I think I use v=vo+at to get this and find acceleration which is 1.667 m/s but I dont know how to write the answer...
c) The box then travels upward at a uniform velocity of 2.5 m/s. What is the Tension in the rope during this time? Is this greater than or less than the weight of the box?

d) The box then slows back to rest in just 0.50 s. What is the Tension in the rope during this time? Is this greater or less than the weight of the box?

2007-03-04 12:08:07 · 2 answers · asked by ? 1

10. A person weighing 490 newtons is standing on a bathroom scale in an elevator that is acceleratinf upward at a rate of 0.2 meter per second squared. what does the bathroom scale indicate the person's weight is?
(a) 480 N
(b) 490 N
(c) 588 N
(d) 500 N
(e) 392 N

13. Two vectors, A and B, have componentgs ax = -2, ay = 3,
bx =1, and by=4. What is the magnitude of the vector A+B?

(a) 3.8
(b) 6.2
(c) 8.2
(d) 5.6
(e) 7.1

14. A 10 newton force is applied to two masses, 4 kilograms and 2 kilograms, respectively, in contact as shown below. the horizontal motion is along a frictionless plane. what is the magnitude of the contact force, P, between the two masses?
(a) 10 N
(b) 3.34 N
(c) 7.86 N
(d) 39.2 N
(e) 4N

2007-03-04 11:49:50 · 3 answers · asked by Whats the Scoop? 2

(a) Calculate the speed of a proton that is accelerated from rest through a potential difference of 120V. (b) Calculate the speed of an electron that is accelerated through the same potential difference.

2007-03-04 10:56:09 · 1 answers · asked by euchred88 1

The armature of a simple AC generator has 20 circular loops of wire with a radius of 10cm. It is rotated with a frequency of 60Hz in a uniform magnetic field of 800mT. What is the max value of the emf induced in the loops, and how often is this value attained?

2007-03-04 10:43:15 · 1 answers · asked by Deco 2

The kinetic energy of a particular mass (m) is found by taking1/2 of the product of the mass((m) and the square velocity (v). Write the expression for the kinetic energy of a particle.

2007-03-04 10:42:38 · 2 answers · asked by Sweetie 2

We know how to measure the gas but how do you explain a gas has mass when some are lighter then air.

2007-03-04 10:37:27 · 7 answers · asked by NatNat 2

2007-03-04 10:22:55 · 5 answers · asked by sakuraandli2gether4eva 1

Can anyone help me out with some guidance in how to approach this problem?

A ray of light strikes a plane mirror at a 45° angle of incidence. The mirror is then rotated by alpha = 7° into the position shown in red in the drawing, while the incident ray is kept fixed.

http://www.webassign.net/CJ/p25-08alt.gif

(a) Through what angle (theta) does the reflected ray rotate?
°

(b) What is the answer to part (a) if the angle of incidence is 60° instead of 45°?
°

2007-03-04 10:13:08 · 2 answers · asked by larkinfan11 3

2007-03-04 10:04:48 · 6 answers · asked by STORMY K 3

How does this "dark force" effect us? What excatly is it? How does this explain the formation of galaxies?

2007-03-04 10:02:56 · 1 answers · asked by Anonymous

2007-03-04 10:01:39 · 1 answers · asked by David H 1

The reason I ask, is that I just got a few "energy saving bulbs and on them they say:
"11W, 220-240V, 96mA

Unless my maths is wrong, using ohms law that doesn't really work out.

I had a look on my normal filament bulbs, but they don't say how many amps they use, so I decided to look on the internet.

The only thing I found was here: http://answers.yahoo.com/question/?link=ask&l=c&qid=&title=&eval_final=&.crumb=2Erv97koPqG&kid=
"240V Light Bulbs - for every 10 watts allow 800mA"

But that means that my 40w bulbs draw more current than my projector (which draws about 1.4A). And the projector has a very very bright bulb, fans and the electrics inside etc.

So here I am asking: How much current does (for example) a 60w bulb in the UK (240v) draw?

2007-03-04 09:59:58 · 5 answers · asked by pandaking 1