Physics - June 2007

A wooden cube "just floats" inside water when a 200gm mass is placed on it. When the mass is removed the cube is 2cm above the water level. The side of the cube is_____cm.

I know the answer is 10cm, But please show the process (along with explanation)

2007-06-12 22:32:48 · 3 answers · asked by D2007 1

where does the equation (E-Ir=IR) comes from where E=EMF ,I=current, R=external resistor and r= internal ressistance.

2007-06-12 22:19:42 · 3 answers · asked by madxplrr 1

2007-06-12 21:55:25 · 5 answers · asked by michael l 1

On the long and the short ends?

Thanks

2007-06-12 21:05:13 · 1 answers · asked by dreamewon 1

2007-06-12 20:49:44 · 7 answers · asked by meghalee d 1

For example, an electron can occupy multiple places, until we look at it, then, as in the double slit expierment, it chooses just one.

Im open to the possibility that I misunderstand the Heisenberg Uncertianty Principal, lol.

Anyway, I would like to have all the atoms in this $100 bill be in both my pocket and my wifes pocket at the same time. Why isnt this possible?

(Well it is, but without my pants being in her pocket, smartass)

2007-06-12 20:31:07 · 4 answers · asked by Anonymous

how would it work if it did?

2007-06-12 19:59:49 · 10 answers · asked by First Name Whittney 3

ok they say you cant go the speed of light because you would become infinite, thus you would need infinite energy.
However if you were on a ship and got to the speed of light wouldnt your fuel source(being with you at the point you went light speed) alo become infinite no matter how little you had left?

2007-06-12 19:04:56 · 11 answers · asked by lost 2

Which of the following deal with fission?

You can pick more than one.

A. inertial confinement
B. critical mass
C. nuclear reactors
D. H-bombs

2007-06-12 18:49:02 · 4 answers · asked by undergrounder 1

Use cylindrical shells to find the volume of the solid generated when the region is enclosed by the given curves is revolved about the x-axis.
y2=x , y = 1, x=0 ( y have small 2( its mean poswer of y)

----
Question: 2)

Find the volume of the solid that results when the region enclosed by the given curves is revolved about the x-axis.

y=x2 + 1 , y= x+3
( 2 is power of x and it is small not capital number)

please solve this. me will thanksfull to you.

2007-06-12 18:44:28 · 4 answers · asked by zubair y 1

thanks so much! :)

2007-06-12 18:34:57 · 1 answers · asked by Anonymous

If you pay attention when looking at water dripping on a smooth surface, you'll see a small percentage of the bubbles produced on impact are different; they are brilliant silver and shoot at high speed away from the impact point. You get more if the water is a little soapy so you might see them when washing the car. The 'bubbles' appear to have water inside them instead of air. I'm not sure of the mechanism of how they're formed. Any thoughts?

2007-06-12 17:40:59 · 4 answers · asked by AmigaJoe 3

If the use of a cold air intake modification on a combustion engine in an automobile helps improve power and gas mileage, would introducing a small- med.-lg. amount of compressed oxygen give the same result?
Anyone who's used an oxy-acetylene torch knows that acetylene alone isn't capable of cutting anything until you turn on the oxygen.
Is the principle of the cold air intake mod that colder air is denser and since oxygen excites combustian the fuel/air mixture is more volatile?
Why does nitrous oxide boost horsepower so much?
Aside from the obvious modifications needed to introduce oxygen into the air/fuel mixture and possible motor component strengthening, what mods would be required to make this work (if at all), ie.- timing, cam, valves, pistons, compression ratio, etc.?

2007-06-12 17:26:03 · 5 answers · asked by Whoda thunkit? 5

Two cars are driving toward each other on a straight and level road in Alaska. The BMW is traveling at 104.8 km/h north and the VW is traveling at 40 km/h south, both velocities measured relative to the road. At a certain instant, the distance between the cars is 11.0 km. Approximately how long will it take from that instant for the two cars to meet? [Hint: Consider a reference frame in which one of the cars is at rest.]

2007-06-12 16:18:41 · 6 answers · asked by terra_flare_aqua_ciel 1

A. gram
B. Kilogram
C.lilter
D. pound

2007-06-12 16:14:06 · 12 answers · asked by sailorsoccer07 1

I am told that anti-matter is matter stripped of its electrons, is this true?

2007-06-12 15:41:54 · 8 answers · asked by Anonymous

basically i'm trying to find the dipole moment between a proton and electron at rest, they are x meters apart. my book doesn't really explain dipole moments, so any help would be awesome!

2007-06-12 15:23:44 · 1 answers · asked by babykrisbach1 2

2007-06-12 15:21:10 · 7 answers · asked by Anonymous

Is it something we use as a scale to compare things or is it a fabric? (as in something that would have proof as existing)

2007-06-12 14:56:58 · 4 answers · asked by Zhongwen Ren 1

At one instant the center of mass of a system of a two particles is located on the x-axis at x=2 m and has a velocity of (5.0m/s)i. One of the particles is at the origin. The other particle has a mass of 0.10 kg and is at rest on the x-axis at x=8.0. What is the mass of the particle at the origin? Total momentum? Velocity of particle at origin?

I have no clue how to solve this. I tried to use xcm = m1+v1+v2*m2..../m1+m2....
and got
m1=(0,0)
m2=(2,0)
m3=(8,0)

xcm= m1*(0)+(2)m2+.10(80)/m1+m2+.10

but then i have to many unknown values to solve for m

2007-06-12 14:41:57 · 5 answers · asked by Anonymous

i have no idea what they are, or what they do in your home. helpppp.

2007-06-12 14:33:54 · 8 answers · asked by Sara.* 1

a) The anode (+ terminal) of an X-ray tube is at a potential of +119000V with respect to the cathode (- terminal). How much work (J) is done by the electric force when an electron is accelerated from the cathode to the anode? Also if the electron is initially at rest, what kinetic energy does the electron have when it arrives at the anode?

b) The potential at location A is 440V. A positively charged particle is released from rest & arrives at location B with a speed vB. The potential at location C is 784V, & when released from rest from this spot, the particle arrives at B with twice the speed it previously had, or 2vB. Find the potential at B.

c) Two hollow metal spheres are concentric with each other. The inner sphere has a radius of 0.1740m & a potential of 86.0V. The radius of the outer sphere is 0.176m & its potential is 84.0V. If the region between the spheres is filled with Teflon, find the electric energy contained in this space.

2007-06-12 14:05:44 · 2 answers · asked by Brandy J 1

a) Two charges A & B are fixed in place, at different distances from a certain spot. At this spot the potentials due to the two charges are equal. Charge A is 0.179 m from the spot, while charge B is 0.444m from it. Calculate the ratio qB/qA of the charges.

b) Four identical charges (+2.20 micro coulomb each) are brought from infinity & fixed to a straight line. The charges are located 0.416m apart. Determine the electric potential energy of this group.

c) What point charge is at the center of a +24V epuipotential surface that has a radius of 0.199m?

d) The inner and outer surfaces of a cell membrane carry a negative & positive charge, respectively. Because of these charges, a potential difference of about 0.0750V exists across the membrane. The thickness of the membrane is 7.95x10^-9m. What is the magnitude of the electric field in the membrane?

2007-06-12 13:49:32 · 3 answers · asked by Brandy J 1

like making gold and stuff.

2007-06-12 13:19:31 · 8 answers · asked by Anonymous

When measuring resistance on resistor or even potentiometers, true resistance deviates from listed resistance. A 10K Ohm, may in fact be 9.9999 K Ohm, as opposed to true 10K.

The bigger picture of a deviation from true Pi is perhaps the travel of an electron in an atom. If wave particle duality is true in that everthing behaves as a sine function, how do we know that absolutely, all forces and matter revolve in a true pi?

A car going in a circle deviates greatly from pi, the path it takes (let's say, pi as 3.14 per whatever measurement). Whilst an electron orbiting protons and neutrons perhaps follow a more precise orbit (say, Pi to one billion places).

Now if electrons deviate from a true pi path, how do we know that with the concept of wave duality, this does not affect all other things in the bonded chain that makes our universe?

2007-06-12 13:16:12 · 3 answers · asked by Frank D 2

It just proves that science is a stupidity realm made by humans to deceive all of us.

2007-06-12 12:03:16 · 8 answers · asked by Johnny Y 1

you are trying to lose weight by working out on a rowing machine. each time you pull the rowing bar toward you, it moves a distance of 1.2m in a time of 1.5s. the readout on the display indicates that the average power you are producing is 82w. what is the magnitude of the force that you exert on the handle?

for some reason i keep getting the wrong answer...im not sure why, any help please
thanks

2007-06-12 11:40:14 · 4 answers · asked by Anonymous

What actually happens at an atomic level when two pool balls collide headon I dont want to know about the trajectory, just the subatomic point of contact ( if there is any )

2007-06-12 11:08:16 · 2 answers · asked by Anonymous

What are three main advantages of studying objects at different wavelengths of radiation?

2007-06-12 10:49:05 · 2 answers · asked by Anonymous

Hi,

so the problem is a 30 g marble ball which moves to the right with a speed of 0.200 m/s and a 10g ball coming from the right. with a speed of 0.4 m/s. They collide and I want to find the velocity after they collide. I got this far

mv1+mv2=mv1f+mv2f
0.03*0.2+0.01*-0.4 = 0.03v1f + 0.01v2f
0.002=0.03v1f + 0.01v2f

then i used
v2f-v1f = -(v2-v10)
v2f-v1f = -.6

then i solved for v2f and substituted it into the first equation.
.002 = 0.04v1f+0.01 (-.6 +v1f)
...
v1f=.2

v2f= -.6+.2 = -.4

those final velocities are wrong they should be -0.1 and 0.5 and also i think v1f should have been negative cause it is going in the opposite direction after the collision. I'm not sure what i did wrong but i really appreciate any help.

2007-06-12 10:48:24 · 3 answers · asked by Anonymous