Physics - November 2006

It's okay I solved it though, that answer was comprehensive, thanks.

2006-11-06 07:34:32 · 1 answers · asked by anonymous2372000 1

What's entanglement?

2006-11-06 07:28:47 · 4 answers · asked by Anonymous

2006-11-06 07:17:32 · 11 answers · asked by A True Gentleman 5

a pump under constant pressure uses 25000 joules of energy (work to move 30m squared of water. find the pump pressure required to do the work.

2006-11-06 07:09:57 · 1 answers · asked by Chris D 1

If you went back in time, would you be able to change events that have already happened? What happens if you modified the past and got stuck in a loop. For Example: You hate ure grand-father, and go in the past and kill him. But if he was killed, then your father cannot have been borned and neither you. If you couldn't have been born then how did you go back in the past and killed your grand-father, meaning you didn't so if you didn't.... (you get the cycle)

2006-11-06 07:09:27 · 6 answers · asked by Georges K 1

would prefer a nonmath narrative description

2006-11-06 06:36:34 · 6 answers · asked by Anonymous

an energy-efficient lightbulb,taking in 28.0 W of power,can produce the same level of brightness as a conventional bulb operating at a power 100W.the life time of the energy efficient bulb is 10000 h and its purchase price is $17.0,whereas the conventional bulb has life time 750h and costs $0.420 per bulb.

Determine the total savings obtained by using one energy-efficient bulb over its life time,as opposed to using conventional bulbs over the same time of period?
assume an energy cost of $0.0800 per Kilowatt-hour.

2006-11-06 06:35:45 · 4 answers · asked by reem h 2

A turntable with a moment of inertia of 5.1 10-3 kgm2 rotates freely with an angular speed of 33 1/3 rpm. Riding on the rim of the turntable, 15 cm from the center, is a 1.3 g cricket.
_________rpm

2006-11-06 06:26:27 · 1 answers · asked by star043086 1

An object weighing 325 N in air is immersed in water after being tied to a string connected to a balance. The scale now reads 265 N. Immersed in oil, the object weighs 295 N.

(a) Find the density of the object.

(b) Find the density of the oil

2006-11-06 06:16:23 · 1 answers · asked by mastersource2005 5

The four tires of an automobile are inflated to a gauge pressure of 2.3 105 Pa. Each tire has an area of 0.027 m2 in contact with the ground. Determine the weight of the automobile.

2006-11-06 06:14:54 · 2 answers · asked by mastersource2005 5

A ball is rotating in a horizontal circle at the end of a string that is 3.2 m long at an angular velocity of 11.5 rad/s. The string is gradually shortened to 2.7 m without any force being exerted in the direction of the ball's motion.

A) Find the new angular velocity fo the ball in rad/s. (the ans. is not 13.63??).

B) Find its new linear speed in units of m/s. (36.8 is not right??).

2006-11-06 05:57:18 · 5 answers · asked by Mariska 2

i just wanted to know if all chemical energy has an internal resistance or not... i know wat a chemical energy is but not sure if every chemical energy have an internal resistance within it.

2006-11-06 05:53:40 · 1 answers · asked by bex 2

2006-11-06 05:22:06 · 5 answers · asked by dubkza 1

2006-11-06 05:13:44 · 5 answers · asked by dubkza 1

A flywheel in the shape of a solid cylinder with a radius of 0.499 m and mass of 10.1 kg can be brought to an angular speed of 5.88 rad/s in 0.531 s by a motor exerting a constant torque. After the motor is turned off, the flywheel makes 26.8 rev before coming to rest because of friction (which is assumed constant during rotation).

What percentate of the power generated by the motor is used to overcome friction?

2006-11-06 05:01:01 · 1 answers · asked by Dee 4

A bike tire with a radius of 0.30 m and a mass of 1.1 kg is rotating at 93.6 rad/s.

What torque is necessary to stop the tire in 1.7 s (in units of N . m)?

2006-11-06 04:56:14 · 4 answers · asked by Dee 4

...it'sinteresting to me

2006-11-06 04:49:11 · 1 answers · asked by Narrator 3

In a question, a pebble and a feather both have the same mass (and so the same weight), but the feather reaches terminal velocity quicker than the pebble. How would you explain that using Newton's Laws?

2006-11-06 04:46:33 · 3 answers · asked by lykastar 3

So we worry about dirty bombs and nuclear bombs getting in the hands of terrorists, but at the same time send tanks loaded with depleted uranium shielding and ammo into iraq.

At the time we first sent them our viewpoint was the armour was so tough (due to the depleted uranium) that it would be a rare event to lose one. We had no idea that the IED's would be so big, that we are losing tanks like everything else.

I read on wiki that depleted uranium is use as a neutron reflector in making nuclear weapons. So, are we helping our enemy?

2006-11-06 04:41:14 · 6 answers · asked by Anonymous

Here is a physics thought experiment examining conservation of energy and EM propagation. In answering, please address how the experiment is resolved from a purely classical interpretation (i.e., how might Maxwell have answered this question?); and, how a QM interpretation might result in a different explanation? Here is the experiment. Let us arrange a coherent monochromatic light beam, e.g. a laser beam, to be split and directed along two paths. With repect to the light's wavelength, the paths are suitably arranged such that a half-cycle net time delay exists between them. These beams are then recombined downstream, so as to destructively interfere there. Question: where does the light energy "go"? Or, worded another way, what physical part of this experiment "gets hot"?

2006-11-06 04:35:39 · 6 answers · asked by Chapadmalal 5

2006-11-06 04:08:56 · 1 answers · asked by Anonymous

There must be facts that make anyone even remotely interested in science/astonomy to go..."wow!"

2006-11-06 03:59:05 · 8 answers · asked by Anonymous

The friction coefficient between an athelete's ahoes and the ground is 0.90 . Suppose a superman wears these shoes and races for 50 m. There is no upper limit on his capacity of running at high speeds . What will be the minimum time that he will have to take in completing the 50 m starting from rest ?

2006-11-06 03:56:06 · 1 answers · asked by pratip 1

2006-11-06 03:51:40 · 1 answers · asked by MAC 1

This must be an illusion. I can see individual waves moving up and down, but the horizon is too far away to allow me to see things this small. A puzzeling phenomonia.

2006-11-06 03:22:26 · 2 answers · asked by Donald T 1

2006-11-06 03:16:01 · 2 answers · asked by Balls_Deep 1

In a distance/time graph, is time the independent variable? If so, does it go on the x-axis or y-axis?

2006-11-06 02:48:58 · 3 answers · asked by Anonymous

2006-11-06 02:43:33 · 14 answers · asked by brian m 1

Would you be able to talk to the guy in front of you?

2006-11-06 01:59:22 · 17 answers · asked by Polo 7

any little help would be great.

A steel beam 10m long is installed in a structure at 20 degrees Celsius. What are the beams changes in length at the temperature extremes of -30 degrees celsius to 45 degrees celsius

2006-11-06 01:55:41 · 1 answers · asked by WHISPER 1