Physics - February 2007

2007-02-06 14:08:34 · 2 answers · asked by Anonymous

Can someone concisely explain to me what resonance is in physics (in wave theory)?

2007-02-06 13:59:39 · 1 answers · asked by Anonymous

2007-02-06 13:40:35 · 1 answers · asked by ashley f 1

2007-02-06 13:38:37 · 1 answers · asked by Vincent B. L 1

A 2.50*10^2-kg cast-iron car engine contains water as a coolant. Suppose that the engine's temperature is 35.0º Celsius when it is shut off, and the air temperature is 10.0º Celsius. The heat given off by the engine and water in it as they cool to air temperature is 4.40*10^6 Joules. What mass of water is used to cool the engine?

Please help me with this problem.
I can't understand this.

2007-02-06 13:27:46 · 3 answers · asked by swimmertommy 1

the force required to keep the puck sliding at constant velocity is ?

2007-02-06 13:08:28 · 3 answers · asked by Anonymous

what happens to its molecules when pressure is put on it?? Does it decrease and is so why? if it doesn't why?? if can please give websites for me to look at.

2007-02-06 12:54:17 · 4 answers · asked by Kate L 1

what happens to air when u put pressure on it???

2007-02-06 12:27:33 · 4 answers · asked by Kate L 1

Any help please I think you use the heat transfer formula but i don't know how?

2007-02-06 12:14:50 · 2 answers · asked by Anonymous

I have to make a mini light show/ mini musical exbitat. What are some simple ways to do it. Its due 2/12

2007-02-06 12:08:34 · 1 answers · asked by Anonymous

2007-02-06 12:04:47 · 6 answers · asked by pri_anu1 p 1

A child can throw a baseball at 20mph some professional ball players can throw a baseball at 100mph which is five times as fast. How much more energy does the pro ball player give to the faster ball

2007-02-06 11:56:58 · 1 answers · asked by Bayslappers 1

2007-02-06 11:32:00 · 4 answers · asked by Lo 2

I'm talking hypothetically so only realistic answers. I'm talking about an average swimming pool. No kiddie pools or pools that are the size of a lake.

2007-02-06 11:30:00 · 4 answers · asked by Anonymous

I am trying to re-create a complete *proof* that E(sub_0)=mc^2, or that E=(gamma)mc^2 (I am at the stage where proving one will lead on to the other).
I have the expression for kinetic energy:
K=(gamma)*mc^2 - mc^2
And I need a proof from that of the equations above. All of the books I have looked in simply seem to assert it. Where do I go from here?
NB-all proofs based on Einstein's postulates of course.

2007-02-06 11:09:39 · 1 answers · asked by THJE 3

Am I correct in assuming that due to the earths rotation, a person standing at the equator travels through the fabric of space/time slightly faster than a person standing at either of the poles?

According to Einstein's relativity, wouldn't they age slower, since time slows down as you approach the speed of light?

2007-02-06 10:47:02 · 4 answers · asked by Anonymous

How do find the transformations in general?

2007-02-06 10:46:04 · 1 answers · asked by Angelina 1

1. What is an alternationg circuit?
2.how does a direct current differ from an alternating current?
3. What is a conductor of electricty
4. What is a semi-Conductor? What is the most popular ingredient added to metal to produce a sem-conductor
5.What is a insalator?
6. Explain what we mean by a volt?
7. What is a series curcuit?
8. Why does a string of christmas lights go out if one bulb is burned out?
9. What is the resistance of a circuit that shows a voltage drop of 4 volts when a current of .5 amps is flowing thought it?
10.What current flows through and appliance if the voltage is 36 volts and the resistance is 18 ohms?
11. what is the voltage drop of a system if the amps 5 A and the resistance is 10 Ohms?
12. What are the three varaations of the forumla for resistance, voltage and current?
13. If a house ciruit is to be constructed to run 5 (100 watt) lights, how large must the breaker be?
14. The 4 best conductors of electricity in order of conductivity are?

2007-02-06 10:45:57 · 1 answers · asked by Anonymous

The speed of a bicyclist is 10 mph faster than the speed of a walker. If the bicylist travels 26 miles in the same amount of time that the walker travels 6 miles, find the speed of the bicyclist.

2007-02-06 10:33:19 · 7 answers · asked by Anonymous

A 2860 Hz tuning fork is sounded at the same time that a note on a piano is struck. You hear 12 beats/s. You tighten the string slightly and now hear 20 beats/s. What is the frequency of the vibrating piano string now after the tightening?

How would you solve this without the frequency of the piano string when you hear 12 beats/s?? Some help please?

2007-02-06 10:23:21 · 3 answers · asked by Anonymous

Why does the tennis ball go the farthest?

2007-02-06 10:05:26 · 8 answers · asked by webprincess02 1

my friend insists its yellow, but isnt it really white?!! SERIOUSLY!

2007-02-06 09:51:57 · 6 answers · asked by iloveyou! 2

coppers and silver can be cahrged by unduction. i know its because plastic in general doesnt conduct electricity, but isnt there more to it?

2007-02-06 09:48:22 · 4 answers · asked by socom_lover 2

You know how with momentum...there is inelastic and elastic collisions. Well right now I am doing a lab that is about explosions...so what I am wondering is...if there are also inelastic and elastic explosions or does that not make sense. I have to do a lab that explains possible reasons and explanations of error for why in an explosion of two carts ...conservation was not conserved.

2007-02-06 09:43:41 · 1 answers · asked by Jane A 3

The range of human hearing is roughly from twenty hertz to twenty kilohertz. Based on these limits and a value of 340 m/s for the speed of sound, what are the lengths of the longest and shortest pipes (open at both ends and producing sound at their fundamental frequencies) that you expect to find in a pipe organ?
....................................... m (shortest pipe)
......................................m (longest pipe)

2007-02-06 09:42:04 · 5 answers · asked by Anonymous

m/s in 2 s. What is the total force her harness had to withstand? How many times her weight is this force?

2007-02-06 09:34:29 · 3 answers · asked by Anonymous

If the masses of the two objects are equal, then their post-explosion velocity will be equal in magnitude (assuming the system is initially at rest). If the masses of the two objects are unequal, then they will be set in motion by the explosion with different speeds. Yet even if the masses of the two objects are different, the momentum change of the two objects (mass • velocity change) will be equal in magnitude.

What I am confused about is...in an "explosion" of two carts, if the masses are unequal, is momentum still conserved? How so?

2007-02-06 09:29:26 · 5 answers · asked by Jane A 3

a- parallel to both the magnetic field and the wave direction
b- perpendicular to both the magnetic field and the wave direction
c- parallel to the magnetic field and prependicular to the wave direction
d- perpendicualr to the magnetic field and parallel to the wave direction

2007-02-06 09:28:18 · 3 answers · asked by Samantha B 1

a- X-rays
b- radio waves
c- light waves
d- sound waves

2007-02-06 09:21:39 · 3 answers · asked by Bailey B 1

a- a magnetic field
b- electromagnetic waves
c- sound waves
d- nothing in particular

2007-02-06 09:20:23 · 2 answers · asked by Bailey B 1