Physics - May 2007

1. 720 C
2. 360 C
3. 3.0 C
4. 12 C

2007-05-03 16:36:33 · 4 answers · asked by tiffanyjdias 1

How many electrons must be removed to make the sphere neutral?

A. 2.5 x 10^-13
B. 1.6 x 10^12
C. 4 x 10^12
D. 7.03 x 10^24

2007-05-03 16:26:26 · 1 answers · asked by Anonymous

i want to know if having a lamp on or the lights on in the ceiling (or anything else that creates light, excluding fire, such as a light bulb) will effect the room temperature much,
making it hotter or is this change hardly noticeable that it seems like nothing had changed?

2007-05-03 15:56:01 · 6 answers · asked by Anonymous

2007-05-03 15:16:39 · 3 answers · asked by Ryoma Echizen 3

A typical decibel level for a buzzing mosquito is 40 dB, and normal conversation is approximately 50 dB. How many buzzing mosquitoes will produce a sound intensity equal to that of normal conversation?

2007-05-03 15:01:29 · 7 answers · asked by J39P 1

2007-05-03 14:37:28 · 1 answers · asked by mocha 1

In mathematica terms?

2007-05-03 13:54:49 · 3 answers · asked by questforanswers 3

2007-05-03 13:19:11 · 6 answers · asked by RONNIE R 1

2007-05-03 13:09:30 · 6 answers · asked by Josh G 1

One end of a horizontal string is tied to a wall, and the other end is tied to an object with weight W that hangs over a pulley to hold the string taut. The object is large enough that the string never moves at the pulley. Under these conditions, the string vibrates with wavelength and frequency in its first harmonic.

a) If we add enough weight to double W without appreciably stretching the string what will be the wavelength and frequency of the string's first harmonic vibration?

b) If we don't change W, but move the pulley so that the vibrating part of the string is half as long, what will be the wavelength and frequency of the string in its first harmonic?


c) If we now double W (without appreciably stretching the string) and at the same time move the pulley so that the vibrating part of the string is twice as long as it originally was, what are the wavelength and frequency of the string in its first harmonic?

2007-05-03 12:40:29 · 1 answers · asked by dude 1

2007-05-03 12:34:15 · 3 answers · asked by boots 1

the child is standing on a scale while riding in the elevator and when the elevator is not moving he weighs 80 lbs. when the elevator accelerates upward at one g what will his weight be?

2007-05-03 11:29:21 · 4 answers · asked by Julia G 1

2007-05-03 10:27:58 · 5 answers · asked by Anonymous

Ultra-floppy disk drive operates at speed 60GRPM (f=1GHz).
By how much the proper area of 3.5" floppy disk is increased,
if its diameter remains unchanged ?

2007-05-03 10:20:19 · 6 answers · asked by Alexander 6

2007-05-03 07:50:58 · 3 answers · asked by blondie42 1

2007-05-03 07:39:00 · 6 answers · asked by alvarenga_m 1

why are car fog lights yellow? Does it matter it their yellow? Does driving in the city or countryside make a difference?

2007-05-03 06:43:57 · 3 answers · asked by Anonymous

Is there a way to calculate the evaporation rate of say, a droplet of water? From what I understand, there are several factors to be taken into account:
- temperature
- air humidity
- concentration of substances dissolved in the water
- the rate at which fresh air is brought in near the surface (Fick's law of diffusion?)
- effect of hydrogen bonds in the water
- surface area of the droplet
- Does the type of material the droplet lies on also have a significant effect on evaporation rate?

2007-05-03 06:14:39 · 3 answers · asked by tzz1985 2

a 3.0kg mass sliding on a frictionless surface into a 1.0 *** and a 2.0 mass. after the explosion the velocity of the 1kg mass is 5.0m/s due north, and that of the 2kg mass is 7.0m/s, 45 degrees south of east. what was the original speed and direction of the 3kg mass?

2007-05-03 05:51:33 · 2 answers · asked by Joseph C 1

Even if you are touching the metal shaft, you are still only touching one side which may be hot, but you don't have a complete path for the electricity to go thru you to ground (assumming you are wearing shoes and not touching anything else - or standing in water!). If you know the answer please explain. No lame guesses from morons please!

2007-05-03 05:48:20 · 7 answers · asked by wonderman 1

2007-05-03 05:32:00 · 3 answers · asked by Alexander 6

A railroad freight car whose mass is 70,000kg collides qith a stationary caboose car, there is no friction with the rails. the cars couple 2gether and 20% of the initial kinectic energy is transformed into thermal energy,sound,bending of metals,vibrations,e.t.c. find the MASS of the caboose?

2007-05-03 05:25:30 · 2 answers · asked by Anonymous

The beam of light from a laser on a rotating turntable casts into space. At some distance, the beam moves across space faster than c. Why does this not contradict relativity?

2007-05-03 05:25:03 · 4 answers · asked by LostinPhysics 1

two blocks, one 8.0 kg and the other 5.0 kg, sit side by side in contact with each other on a frictionless horizontal surface. if a constant horizontal force of 40N is applied to the 8-kg block in the direction of the smaller block, what is the magnitude of the resulting acceleration? find the contact force the two blocks exert on each other.

2007-05-03 05:20:08 · 4 answers · asked by Joseph C 1

2007-05-03 04:56:58 · 12 answers · asked by Anonymous

2007-05-03 04:56:08 · 3 answers · asked by franco vita 2

I have always wondered if a helicopter could stay aloft in stationary position long enough would the world be moving underneath it such that it would "go around the world" in 24 hours....

2007-05-03 04:41:02 · 3 answers · asked by getoutatown_2000 1

2007-05-03 04:10:18 · 4 answers · asked by Eckbert 1

2007-05-03 04:05:05 · 9 answers · asked by ASHUTOSH Jena 1

Here are the choices.
Radio Waves
Light Waves
X-Rays
None of the above

My question is I need help find out which one has the largest Velocity, largest frequency, and largest wavelength , and then I need help find which one these have the highest energy? Can you please help me.

2007-05-03 03:28:11 · 7 answers · asked by Sesily E 1