Physics - March 2007

Everything in the room, including you and a candle are the same shade of black. The flame would be the only non-black thing in the room.

2007-03-02 08:33:01 · 4 answers · asked by Karen 2

What would be the energy (in J) required to break a proton into its fundamental constituents (quarks)?

Would the following be a legitimate calculation?

The wiki article on QCD matter states the following:

"At ordinary temperatures or densities this force just confines the quarks into composite particles (hadrons) of size around 1 fm and its effects are not noticeable at longer distances. However, when the temperature reaches the QCD energy scale (T of order 10^12K) or the density rises to the point where the average inter-quark separation is less than 1 fm, the hadrons are melted into their constituent quarks"

Would it, therefore, be correct to assume that a temperature of 10^12 K must be reached in order to break down a proton? Assuming yes, I'll continue.

So, using Hydrogen, as it most closely resembles a lone proton, i'll use the following formula:

(mass of hydrogen sample)(specific heat of hydrogen)(delta T)

2007-03-02 08:29:42 · 3 answers · asked by other_user 2

The current in a circuit is tripled by a connecting a 500-ohm resistor in parallel with the resistance of the circuit. Determine the resistance of the circuit in the absence of the 500-ohm resistor.

2007-03-02 08:17:49 · 6 answers · asked by hpage 3

I have to run 1.5 miles and 300 meters. How can I covert that down to simple distance so I can practice?

2007-03-02 07:46:11 · 10 answers · asked by Anonymous

A car traveling along a level road at speed v = 10 m/s slams on the brakes and skids to a stop. If the force of friction on the car is half the car's weight, how far does the car slide? (Hint: Use the work-energy theorem and solve for d.)

2007-03-02 06:55:42 · 3 answers · asked by Dirck G 1

i'm not undestanding einstein's equation very well. Can someone explain this in a simple manner or provide a website that can?

2007-03-02 06:50:52 · 12 answers · asked by LoVe.PeAcE.jOy. 2

i need to know ASAP for science homework plz

2007-03-02 06:40:18 · 4 answers · asked by Anonymous

What happens when Quark Gluon Plasma is suddenly cooled (or the pressure sustaining it is suddenly relieved)?

Does the inflation of the universe during the inflationary epoch have anything to do with the properties of the plasma?


thanks,

2007-03-02 06:31:35 · 2 answers · asked by other_user 2

# A particle starts from the origin at time t = 0 with a velocity of (-6 i hat - 3 j hat)m/s. The particle moves in the x-y plane with a constant acceleration, (2 i hat + 3 j hat) m/s2. At the instant the particle reaches its turning point along the y-axis, what is the magnitude of its displacement from the origin?

2007-03-02 06:25:54 · 2 answers · asked by hbktona 1

2007-03-02 06:10:19 · 10 answers · asked by ♥ 2

Three charges are situated at three corners of a rectangle as follows:
Upper left corner: 7.0 microC.
Lower Left Corner: 2.1 microC.
Lower right corner: 4.2 microC.

The height of the rectangle is 2.4 cm and the length of the rectangle is 6.5 cm. The columb constant is 8.98755e9 NM^2/C^2. How much electrical potential energy would be expected in movign the 7.0 microC charge to infinity (in J).

2007-03-02 05:52:59 · 1 answers · asked by Anonymous

an electric field is given by Ex = (2kN/C)X^3. Find the potential difference between the points on teh x-axis at x = 1m and x= 6m. Answer in kV.

2007-03-02 05:48:16 · 3 answers · asked by Anonymous

I've had quite few people tell me this is wrong and out of date

2007-03-02 05:35:56 · 14 answers · asked by The Angry Stick Man 6

A uniform electric field of magnitude 292 V/m is directed in the positive x direction. Suppose a 21 microC charge moves from the origin to point A at the coordinates (.27m, .60m). What is the absolute value of the change in potential from the origin to point A? Answer in V.

2007-03-02 05:34:14 · 2 answers · asked by Anonymous

2007-03-02 05:31:09 · 6 answers · asked by Anonymous

in relation to pa systems ie; from voice to microphone, from mic to amp to mixer etc...

2007-03-02 05:30:57 · 6 answers · asked by Lucy R 1

2007-03-02 04:52:00 · 3 answers · asked by Nishat H 1

If you accidentally ran out 10ft onto an extremely slick frozen pond, you may not be able to walk back because the relative absence of friction. Fortunately, you have a HUGE bag of pennies with you. Using Newtons 3rd Law, explain what you can do to get back.

2007-03-02 04:49:37 · 12 answers · asked by FangZ 2

Q2.do sound waves have refraction?

Q3.what are te lower and upper fixed point of a
a)celsius thermometer
b)faenheit thermometer

2007-03-02 04:35:41 · 14 answers · asked by SWETA 2

The first, second, and third plus, inertis and centrepital force.

2007-03-02 04:34:04 · 8 answers · asked by Lillian J 1

2007-03-02 03:43:22 · 6 answers · asked by Cleo 2

oint A is at a potential of +250 V, and point B is at a potential of -150V. an alpha particle is a helium nuclues that contains two protons and two neutrons; the neutrons are electrically neutral. An alpha particle starts from rest at A and accelerates toward B. When the alpha particle arrives at B, what kinetic energy (in electron volts) does it have?

2007-03-02 03:37:14 · 2 answers · asked by Luisa S 1

The power we derive from metabolism can do work and generate heat. What is the mechanical efficiency of a relatively inactive person who expends 100 W of power to produce about 2 W of power in the form of work, while generating about 98 W of heat?

2007-03-02 03:15:00 · 1 answers · asked by Dirck G 1

I know you not supposed to put a stong magnet near magnetic tape/storage devises becasue is can erase the data but what is actually happening on the surface of the tape to cause this

2007-03-02 03:08:27 · 2 answers · asked by Anonymous

A ball is thrown at an angle of 53 degrees above the horizontal off the roof of a building with an initial speed of 15 m/s. Find the position and velocity of the ball at 1.0s, 2.0s and 4.0s after it was thrown (ignore air resistance) (x- components are horizontal y components are vertical)

What is the x, y, Vx, Vy and V for the ball at 1.0s, 2.0s and 4.0s

I used equation V=at+Vo to solve for V and X-Xo=.5(V+Vo)t to solve for x.

I got 9m/s for Vox, 12m/s for Voy, ax = -9.8m/s^2 and ax= 0m/s^2

Time = 1.0s, x = 9m, y = 7.1m, Vx= 9m/s, Vy =2.2m/s and V = 9.26 m/s

Time = 2.0s, x = 18m, y = 4.4m, Vx= 9m/s, Vy =-7.6m/s and V = 4.82 m/s

Time = 4.0s, x = 36m, y = -15.2m, Vx= 9m/s, Vy =-27.2m/s and V = -25.66 m/s

Someone else told me the velocitys were wrong can someone show me what to do if I did them wrong, thanks

2007-03-02 02:44:41 · 4 answers · asked by Ruphert J 1

2007-03-02 02:39:33 · 9 answers · asked by Anonymous

I will be working at a job fair and I need to decide between 15 amps and 20 amps. Will 15 amps be enought for 4 laptop computers?

2007-03-02 01:53:47 · 4 answers · asked by scott_yoder 1

9VDC with three resistors are connected in a series.
I understand each will have a voltage drop.
I also understand the sum of all voltage drops will be equal to the source voltage.

Does this mean, the resistors are consuming all of the voltage?
That there is no voltage left, coming out of the final resistor?
If voltage is the pressure which current travels through a circuit, then is that the same as saying no current is returning to the battery ( coming out of the final resistor) ?
I am just not quite sure what voltage drop means, I know how to figure it and all but not sure what it really means is happening.
If anyone can explain I really appreciate it and I thank you kindly.

2007-03-02 01:52:11 · 3 answers · asked by Anonymous

2007-03-02 01:38:57 · 2 answers · asked by Anonymous

A homr run is hit into the upper deck of a stadium. The baseball lands (it is descending when it lands) 60ft above the height from which it was hit. The ball left the bat with a speed of 85 mi/hr at an angle of 60 degrees above the horizontal (Ignore air resistance)

a) what is the speed of the ball when it lands?

b) How long was the ball in the air?

c) What is the horizontal distance from home plate (where the ball was hit) to the point where the ball landed? Put your answer to feet.

d) How far (horizontally would it have gone if it had be allowed to fall back to the height it had been hit?

2007-03-02 01:34:13 · 1 answers · asked by Anonymous