Physics - December 2006

2006-12-09 17:13:42 · 4 answers · asked by sunil b 1

2006-12-09 17:06:58 · 1 answers · asked by Cindy 2

2006-12-09 16:42:15 · 9 answers · asked by shelly1740 1

2006-12-09 16:37:57 · 4 answers · asked by QED 1

A 50.0-g hard-boiled egg moves on the end of a spring with force constant k=25.0 N/m. It is released with an amplitude 0.300 m . A damping force F=-bv acts on the egg. After it oscillates for 5.00 s, the amplitude of the motion has decreased to 0.100 m .

Calculate the magnitude of the damping coefficient b. I need to express this answer in kg/s

2006-12-09 16:36:57 · 1 answers · asked by MattS 1

what improvised material (physics) can a student do like me????
pls.. help me

2006-12-09 16:25:09 · 1 answers · asked by Anonymous

A 60.0 g ball of clay is thrown horizontally with a speed of 9.00 m/s toward a 910 g block resting on a frictionless surface. It hits the block and sticks. The clay exerts a constant force on the block during the 10.0 ms it takes the clay to come to rest relative to the block. After 10.0 ms, the block and the clay are sliding along the surface as a single system.
What is their speed after the collision?
What is the force of the clay on the block during the collision?
What is the force of the block on the clay?

2006-12-09 16:00:12 · 1 answers · asked by MattS 1

Can mind travel be induced via technology ?

2006-12-09 15:54:06 · 2 answers · asked by webradio 1

2006-12-09 15:24:08 · 5 answers · asked by Ejsenstejn 2

A satellite cirlces planet Roton every 2.8 h in an orbit having a radius of 1.2x10^7 m. If the radius of Roton is 5.0x10^6 m, what is the magnitude of the free fall acceleration on the surface of Roton?

2006-12-09 15:21:17 · 1 answers · asked by Shane H 2

2006-12-09 15:12:23 · 18 answers · asked by ? 5

2006-12-09 15:10:42 · 7 answers · asked by ? 5

Mismas, one of Saturn's moons, has an orbital radius of 1.87 * 10^8 meters and an orbital period of about 23.0 hours. Use Newton's version of Kepler's third law to find Saturn's mass.

Please help me with this problem.
I'm having trouble understanding it.
I asked this once before, but I was confused with the answers and the formula's used.

2006-12-09 14:38:24 · 2 answers · asked by vicky p 1

Say 1 or 2 above absolute zero, gaseous helium blowing by quickly, is there a Chill Factor?

2006-12-09 14:35:25 · 10 answers · asked by Anonymous

I would probably say it cant but lets say it could what would happen if you did the 2 perfect mirrors faceing each other about 2 feet away from each other and then add a ray of light going perfectly straight in between them? What would it look like? Would the ray of light bounce between them forever? I think perfect mirrors are the coolest.

2006-12-09 13:59:08 · 6 answers · asked by magpiesmn 6

A 1.25-kg book in space has a weight of 8.35 Newtons. What is the value of the gravitational field at that location?

Please help me with this problem.
I'm having trouble understanding how to find the answer.

2006-12-09 13:41:30 · 2 answers · asked by swimmertommy 1

The asteroid Ceres has a mass of 7.0 * 10^20 kg and a radius of 500 km.

a. What is the gravity on the surface of Ceres?

b. How much would a 90-kg astronaut weigh on Ceres?

Please help me with this problem.
I'm having trouble understanding it.

2006-12-09 13:39:54 · 3 answers · asked by swimmertommy 1

Mismas, one of Saturn's moons, has an orbital radius of 1.87 * 10^8 meters and an orbital period of about 23.0 hours. Use Newton's version of Kepler's third law to find Saturn's mass.

Please help me with this problem.
I'm having trouble understanding it.
I asked this once before, but I was confused with the answers and the formula's used.

2006-12-09 13:34:19 · 2 answers · asked by vicky p 1

65kW is to arrive at a town over two 0.100 ohm lines. How much power is saved in the voltage is stepped up from 120V to 1200V and then down again, rather than simply transmitting at 120V. (It is assumed that the transformers are 99% efficient). The answer in book is 54kW.

Thanks in advance!

2006-12-09 13:12:41 · 4 answers · asked by sultan2377 1

I'm having trouble with this problem (especially the last part of it)

Batman(mass of 100kg) swings from a line fixed to a chandelier to kick the Joker(mass of 70 kg) who is directly under the chandeilier. if Batman swings through a height of 2.00m and has a velocity of 3.00 m/s AFTER he kicks the Joker, how far will the joker slide along the floor? Noted: take the coefficent of kinetic friction between the floor and the joker to be .400.

please help..

2006-12-09 12:47:11 · 4 answers · asked by coolguy0603 1

when you have just made a cuppa, if you put the milk in and leave it a while will the temperature difference be less than without milk. I vaguely remember doing something about this in high school physics but cant remember the correct answer.

2006-12-09 12:08:14 · 12 answers · asked by mark w 2

During a chicago storm, winds can whip horizontally at speeds of 100km/h. If the air strikes a person at the rate of 40kg/s per square meter and is brought to rest.
estimate the force of the wind on a person.
Assume the person is 1.50m high and 0.5m wide. Compare to the typical maximum forces of friction (u=1.0) between the person and the ground, if the person has a mass of 70kg.


help me tell the formula , its a problem in my book i cound find it out , but in the back of the book there is an answer for it and the answer is : 8x10^2 N, Fwin> ffr= 7x10^2 N. but i dont know how to get this answer.

2006-12-09 11:55:33 · 2 answers · asked by nice_ girl 1

This always puzzles me!
I knw that energy cnt be created neither destroyed but if u bring two "like poles" close, they jump apart... isnt that creating kinetic enrgy????

2006-12-09 11:50:47 · 12 answers · asked by Khan Sahab!!!! 1

If person A is traveling at 80% the speed of light in a vehicle with a perfect timekeeping mirror, that bounces light off the mirrors to record time very accurately, and person B was on the outside watching at the vehicle pass by, what would the time difference between the persons be to the exact decimal?

2006-12-09 11:35:48 · 5 answers · asked by Anonymous

If so,would it be an answer to interstellar travel? Also where exactly are the atoms during trasit?

2006-12-09 11:23:28 · 2 answers · asked by michael b 1

The direction of electron flow changes direction with the change in polarity from an ac power system. The power flow remains in a constant direction. How do we measure this. How do we know what side the power is being put into, and what side it is coming out of. An electric motor and a generator are magnetically coupled and very similar in design, what clue exists in the power flow that indicates which direction power is flowing?

I have been told that it has to do with voltage leading or lagging current, which are vars. You can however have a positive or negative power factor, you can voltage leading or lagging current, but the power still flows in the same direction.

I have been told that it has something to do with the phase angle of the power. Like the power is out of phase a certain amount depending on the direction, but I'm not sure that's it either. That's just like vars again I thought. I have searched everywhere, can someone please explain this to me?

2006-12-09 11:20:03 · 4 answers · asked by James W 1

i have a problem with physics and plzzz help by reading my question. tell me how to find out and which formula do i have to use.

Take the general case of an object of mass (ma) and velocity(va) elastically striking a stationary(vb=0) object of mass (mb) head-on.
a). show that the final velocity (va') and (vb') are given by : va'=(ma-mb/ma+mb)va
vb'=(2ma/ma+mb)va.
b). what happens in the exrem case when (ma) is much smaller than (mb)? Cite a common example of this.
c). what happens in the exreme case when (ma) is much larger than (mb)? Cite a common example of this.
d). what happens in the case when (ma=mb)? Cite a common example.

2006-12-09 11:14:28 · 9 answers · asked by schoolgirl 1

would the answer to all ifs b the same

2006-12-09 11:00:22 · 11 answers · asked by krombone 1

C'mon there really is no physical reality, We know that atoms dont really touch one another, they only align to electromagnetic polarity, Our senses are purely elctrical, everything we experience is but a electromagnetic field pattern, energy with information.

2006-12-09 10:54:57 · 3 answers · asked by Anonymous

I was wondering how to prove kepler's first law. It would be appreciated if you explained each step.

2006-12-09 10:51:14 · 2 answers · asked by Anonymous