Physics - November 2007

Where:
ºF=ºC=K=R?

2007-11-09 03:27:20 · 5 answers · asked by zeldaevolution 1

When a stone is whirled around using a string there is a force acting towards the centre of the cirlcle. Is there a force acting towards the circumferance too?

2007-11-09 03:15:45 · 3 answers · asked by Nimal T 1

led type put out the light nessary for my needs but is too much inthe way , is the filiment responsible or the led lens?????????????

2007-11-09 03:11:25 · 2 answers · asked by Jeremy B 1

In studying HIGH BLOOD PRESSURE medical scientist admit they do not know 90% to 95% of the time what causes it. Why don't the govt. furnish equip. so other scientific studies could be just as positive as the BIG BANGERS who never have to admit they could be wrong?

2007-11-09 02:53:23 · 6 answers · asked by james h 2

2007-11-09 02:47:12 · 1 answers · asked by haywood 55 2

2007-11-09 02:29:45 · 2 answers · asked by haywood 55 2

No answers from the wiki. i don't really understand what it means. so the answer has got to be layman.

i understand that a superconductor has no resistance in it. it is a metal supercooled by liquid nitrogen and stuff. i just don't understand why the Meissner effect can make a magnet float.

2007-11-09 02:19:28 · 1 answers · asked by AKL 3

According to Einstein and others, gravity results from the curvature of space-time. It has been tested and is found true. I don't argue it. I just do not understand the following.

How does this explain my strong attraction to earth?

How can I understand that curvature of space-time is causing falling objects to accelerate at ca. 9.8 m/s^2 toward earth -- unfailingly?

It seems that for objects on earth something else is at work?

Is it love? (sorry for my fuzzy humor)

Any ideas? Any good explanations?

2007-11-09 01:37:39 · 4 answers · asked by Fuzzy 7

2007-11-09 01:05:34 · 6 answers · asked by mister? 1

depth and density relationship

2007-11-08 23:35:37 · 6 answers · asked by Anonymous

2007-11-08 23:13:08 · 3 answers · asked by yashvi s 2

What is the lift (in newtons) due to Bernoulli's principle ona wing of area 78 m^2 if the air passes over the top and bottom surfaces at speeds of 260 m/s and 150 m/s, respectively?

2007-11-08 21:23:02 · 2 answers · asked by Anonymous

2007-11-08 21:16:00 · 5 answers · asked by DivCW 2

The force exerted by an unusual spring when it's compressed a distance 11 {\rm cm} from equilibrium is given by F = - kx - cx^3, where k = 304N/m and c = 3.5N/m^3.

Find the energy stored in this spring when it's been compressed 11 {\rm cm}.

Isn't the energy stored equal to

U = 1/2 kx^2

I plugged in 304 for k and .11 for x and go 1.839 which was incorrect. I know this problem looks too easy to be true so I want to know what I did wrong.

2007-11-08 20:13:11 · 2 answers · asked by Anonymous

The mercury in my thermometer has separated and so does not give an accurate reading. Does anyone know how to bring it back together?

2007-11-08 19:57:12 · 11 answers · asked by Anonymous

my mam said that nucleus is positive charge wherelse electron is negative charge so it revolves. opposite charge attract each other. then why electron and nucleus are not attracted?

2007-11-08 19:55:11 · 8 answers · asked by Anonymous

A skier starts down a frictionless 30{^\circ} slope. After a vertical drop of 27m, the slope temporarily levels out and then drops at 22{^\circ} an additional 41m vertically before leveling out again.

A. What is the skier's speed on the upper level stretch?

B. What is the skier's speed on the lower level stretch?

My Work for A:

Initial: K + U = Final: K + U
K = kinetic energy, U= potential energy
Initial: 1/2 mv^2 = mgh = Final: 1/2 mv^2
Since it's a 30 degree slope, force of gravity is:
X direction: mgsin30
Y direction: mgcos30
Where gravity = 9.8 m/s^2
Height: 27m

Before the 27m drop, does the skier have kinetic energy? I would think so because he's moving but does he have potential energy right before he drops? If so, does the kinetic+potential before he drops have to equal to 1/2 mv^2 once he is on the stretch?

I am confused.

Thanks.

2007-11-08 19:49:34 · 1 answers · asked by Anonymous

please help. i know its true but why?

2007-11-08 19:31:40 · 1 answers · asked by wtfitsnguyen 2

2007-11-08 18:52:28 · 4 answers · asked by worried person 1

A stainless steel band (coefficient of linear expansion = 17.3 10-6°C-1; Young's modulus = 18 1010 N/m2) is placed around a tooth. It is essentially circular with an initial mean radius of 5.0 mm, a height of 3.6 mm, and a thickness of 0.46 mm. If the band just fits snugly over the tooth when heated to a temperature of 77°C, what is the tension in the band when it cools to a temperature of 37°C?
????N

2007-11-08 18:02:00 · 1 answers · asked by Ashley S 1

Her mass is 77.5kg.
The terminal speed is 54.5m/s.

2007-11-08 17:57:37 · 1 answers · asked by physics 1

An object is located 3.5cm from the optical centre of a lens. The lens produces an image of magnification that is +0.667 the size of the object.

- Is this lens a diverging or a converging lens? Explain your answer.

- Find the position of the image and the focal length of the lens using the magnification equation and the thin lens equation.

2007-11-08 17:18:02 · 1 answers · asked by Anonymous

A high diver leaves the end of a 5.0 m high diving board and strikes the water 1.4 s later, 2.2 m beyond the end of the board. Considering the diver as a particle, determine the following.
(
a) her initial velocity, v0
____ m/s ____° above the horizon

(b) the maximum height above the water reached
______ m
(c) the velocity vf with which she enters the water
_____ m/s _____° below the horizon

2007-11-08 17:09:17 · 3 answers · asked by sportmatic23 1

The bulk modulus for oil is 5.00 G Pa.

If you take 5.20 L of oil from the earth to Venus, where the surface pressure is 92.0 atmospheres, how much will its volume change, assuming that it is in a flexible (and hence compressible) container? (Ignore the temperature change.)

2007-11-08 16:51:47 · 2 answers · asked by ! 2

A 3:25 g particle is moving at 1:51 m/s toward a stationary 7:89 g particle. (a)With what speed does the heavier parti-
cle approach the center of mass of the two particles? Answer in units of m/s.
(b)What is the magnitude of the momentum of the lighter particle, relative to the center of mass? Answer in units of Ns.

2007-11-08 16:39:35 · 2 answers · asked by Captain Jack is Back 1

A 0.016 kg marble sliding to the right at 20.9 cm/s on a frictionless surface makes an elastic head-on collision with a 0.016 kg marble moving to the left at 18.6 cm/s. After the
collision, the first marble moves to the left at 18.6 cm/s.
a) Find the velocity of the second marble after the collision. Answer in units of m/s.
b) What is the total kinetic energy before the collision? Answer in units of J.
c) What is the total kinetic energy after the collision? Answer in units of J.

2007-11-08 16:35:52 · 1 answers · asked by Captain Jack is Back 1

force requiered to cause the car to go around the corner at constant speed:

a. the centripetal force increases
b. the centripetal force decreases
c. the centripetal force remains the same
d. none of the above

I think it's d using common sense I can't find this at google or my textbook so am I right or wrong

2007-11-08 16:33:42 · 2 answers · asked by Too CooL 3

ALL excited electrons give off energy when they return to their ground state from an excited state. Why don’t all heated substances give off colored light?

2007-11-08 16:10:20 · 2 answers · asked by Anonymous

By how much does the carrier lengthen when it is traveling in the warm Mediterranean Sea at a temperature of 21°C?

2007-11-08 16:07:08 · 2 answers · asked by Anonymous

Furthermore, what's it's gravitational attraction to the Earth?

How would I calculate these two things?

2007-11-08 15:59:59 · 2 answers · asked by Kiwi K 1