Physics - November 2006

2006-11-12 23:30:10 · 4 answers · asked by arman jon v 1

2006-11-12 22:05:44 · 7 answers · asked by raine01_21 1

2006-11-12 21:51:03 · 4 answers · asked by Anonymous

2006-11-12 21:16:31 · 7 answers · asked by Rockesh 2

principle of least action is a variational principle related with hamiltonian formulation

2006-11-12 21:09:06 · 4 answers · asked by Bipin mzr 1

2006-11-12 21:07:05 · 4 answers · asked by pps 1

2006-11-12 19:21:10 · 9 answers · asked by Xa!ny 2

can you pls help me me here are the questions:
1. what is physics?
2. what are the sub - area of physics?
3 how phsics help in technological developments?

2006-11-12 19:06:38 · 6 answers · asked by Anonymous

The flywheel of a steam engine runs with a constant rotational velocity of 150 rev/min. When steam is shut off, the friction of the bearings and of the air stops the wheel in 2.2 h.

(a) What is the constant rotational acceleration, in revolutions per minute-squared, of the wheel during the slowdown? (b) How many rotations does the wheel make during the slowdown?

(c) How many rotations does the wheel make before stopping?

(d) At the instant the flywheel is turning at 75 rev/min, what is the tangential component of the translational acceleration of a flywheel particle that is 50 cm from the axis of rotation? (e) What is the magnitude of the net translational acceleration of the particle in (d)?

Can you explain your answers, and show the equations you used to solve this?

2006-11-12 18:57:43 · 2 answers · asked by Anonymous

In theory if you traveled in a circle fast enough there would be a point when you arrived at the depature point before you left it?

2006-11-12 18:55:37 · 18 answers · asked by ANON 4

is the fourth??????

How can time be a dimension, how can anything.

Just say that you have a cardboard box, everything in that box is air and empty space, how can there be more than one dimension, what is a dimension, it it made of matter??? (I'm a biologist, not a physicist)

Also, what is time, I don't believe there is a force regulating the movement of molecules and atoms, if we never even contemplated time then nothing would be any different, because batteries make a clock tick, which measures how long until the end of the day. Time isn't a force. Or is it?

2006-11-12 18:24:57 · 9 answers · asked by Anonymous

The flywheel of a steam engine runs with a constant angular speed of 300 rev/min. When steam is shut off, the friction of the bearings stops the wheel in 2.5 h.
(a) What is the constant angular acceleration, in revolutions per minute-squared, of the wheel during the slowdown?
b) How many rotations does the wheel make before stopping?
(c) At the instant the flywheel is turning at 75 rev/min, what is the tangential component of the linear acceleration of a flywheel particle that is 50 cm from the axis of rotation?
(d) What is the magnitude of the net linear acceleration of the particle in (c)?

2006-11-12 17:56:04 · 3 answers · asked by Shane H 2

Yes, I'm aware that the laws of thermodynamics say that perpetual motion machines are impossible, but just imagine that some mad scientist miraculously invents one. What could such a machine be used for? Also remember that perpetual motion machines come in two types... 1. ones that just run forever with 100% efficiency and... 2. ones that are more than 100% efficient (they basically create energy from nothing) What would be some practical uses for both types? Use your imaginations! :)

2006-11-12 17:45:58 · 3 answers · asked by Link 5

You launch your physics textbook along a horizontal desk with an initial speed of 5.0 m/s. The kinetic coefficient of friction is .15. Find the acceleration of the textbook and the stopping distance.

2006-11-12 16:26:06 · 2 answers · asked by sowheredoibegin 1

You ( of 70 kg mass) are riding in an elevator going up with an acceleration of 3 m/s ^2. How much force does the elevator's floor exert on you?

b) Answer the same question when the elevator is moving down with the same acceleration.

2006-11-12 16:23:44 · 4 answers · asked by sowheredoibegin 1

You want to move a 200-kg piano up a 30 degree incline. The static coefficient of friction is .80 and the kinetic coefficient is .30.
a) What is the minimum force you need to push with to get the piano moving?
b) How much force is needed to keep the piano moving up the incline at constant speed?

2006-11-12 16:20:51 · 3 answers · asked by sowheredoibegin 1

ok i ama bit confused when you have an object hangng from two cables... i know you do F1 F2 F3 and you come up with two variables and solve for eachother. say you have a lamp hanging that weighs 150N and the angles are 35 degrees and 15 degrees how would i solve that?

2006-11-12 16:10:47 · 1 answers · asked by socom_lover 2

I have been pulling my hair out trying to figure this question out and i just cannot!!!!
This makes me want to HATE PHYSICS!!!


here is the question:
1)
A bag of Produce weights 5.83lb on Earth. What should it weight on the moon, where the free-fall acceleration is (1/6) that on Earth? answer in units of N.

if anyone can please help me or show me how to figure it out...I would greatly appreciate it!!!

2006-11-12 15:51:09 · 7 answers · asked by Cool_Tall_One 3

HELP!!!! ASAP please

2006-11-12 15:50:33 · 2 answers · asked by blusunburst 1

It is a dayton gearmotor .Model 3m138Turns clockwise.Want it to turn counter clocwise.

2006-11-12 15:40:40 · 9 answers · asked by Blane R 1

physics.

2006-11-12 14:59:31 · 2 answers · asked by ryan 3 3

2006-11-12 14:57:56 · 1 answers · asked by edsam1 2

Our class is having difficulty with this projectile motion problem that we have to have submitted by tomorrow afternoon. The problem is...

"When a nurse squeezes a syringe, the liquid squirts 3.43 cm into the air. With what speed does the liquid emerge from the syringe?"

She gave us multiple choices to pick from, and in case they are helpful, I'll include them as well.

a.) 0.410 m/s
b.) 0.820 m/s
c.) 1.64 m/s
d.) 2.28 m/s

Thanks for any help!
Phys Class in MN

2006-11-12 14:44:42 · 4 answers · asked by jeanettervetr 2

2006-11-12 13:53:41 · 13 answers · asked by rm 1

An elevator starts from rest with a constant upward acceleration and moves 1m in the first 1.6s. A passenger is holding a 3.1kg bundle at the end of a vertical cord.
The acceleration of gravity is 9.8m/s^2.
What is the tension in the cord as the elevator accelerates? Answer in units of N.

2006-11-12 13:50:08 · 2 answers · asked by Anonymous

2006-11-12 13:44:29 · 5 answers · asked by maisaroni 1

An experiment took place in which an arrow was shot against a target and the distance and velocities were measured. The Overall % of the arrow kinetic energy transferred to the target as kinetic energy was 7.2%.

What happened to the original kinetic energy of the arrow? Give at least four possible ways in which this kinetic energy could have been lost.

would the mean lost into heat and sound? I don't really understand what they're asking when saing "four possible ways". any help?

2006-11-12 13:41:04 · 2 answers · asked by Anonymous

Two 2.00 kg masses are connected by a 50.0 cm long rod of negligible mass. This rod can rotate in the vertical plane around a horizontal rotation axis through its middle. Initially assume the rod is balanced and sitting along the horizontal as shown below. Suddenly a 50.0 g spider drops onto one of the masses with a speed of 3.00 m/s. (a) What is the angular speed of the system just after the spider lands? (b) What is the fraction of kinetic energy after the spider lands to just before it lands? (c) Through what angle will the system rotate before coming to rest?

2006-11-12 13:36:13 · 1 answers · asked by Anonymous

2 words or less answer needed.thankya!

2006-11-12 13:32:29 · 3 answers · asked by z 2

Which creates force of friction: sliding your physics book across the table on its back cover or along one of its edges?

2006-11-12 13:31:17 · 7 answers · asked by Anonymous