Physics - February 2007

On a summer day sunlight may put out 100 million calories into an 80,000 liter swimming pool.
A.) What temperature rise occurs if no other heat enters or leaves the pool?
B.) How many liters of water would have to evaporate from the pool to keep its temperature constant?

2007-02-27 12:49:23 · 2 answers · asked by JaJarvis 1

and going through the point P(4,6,3,2)

2007-02-27 12:45:19 · 1 answers · asked by juliandbn 1

It can be physical or non-physical.

2007-02-27 12:43:54 · 3 answers · asked by Darth Jhon 3

2007-02-27 12:43:08 · 1 answers · asked by raul 1

2007-02-27 12:37:34 · 1 answers · asked by Anonymous

2007-02-27 12:32:36 · 6 answers · asked by Dyanne A 1

Do you expect Kirchoff's voltage law to hold in circuits involving lightbulbs? What about the current junction law? Explain.

2007-02-27 12:04:44 · 1 answers · asked by x3burma 1

for science

2007-02-27 12:03:37 · 3 answers · asked by becky 2

When someone is heading into the event horizon, they basically become two-dimensional. As theory states, the person experiencing it would see nor feel anything happening, but just experiencing going into the event horizon, as the person watching it would see the person being evaporated, ionized, etc.

Now, here's what I don't get, after all that happens to you, all the particles and information that make you you are stored at the edge, still there, which means that the information is retrievable. How is this? wouldn't you go into the black hole, not staying at the edge?

Also, in theory that is considered true, if you are both alive and dead in the event horizon, does that mean that you would be alive forever, just experiencing falling and stuff?

I got this question while I was watching something about Stephen Hawking's theory that a black hole simply disappears, leaving no information behind on the Science Channel. Physicists where challenging it with this after reading a lot and coming up with this.

2007-02-27 11:45:46 · 2 answers · asked by George 3

2007-02-27 11:34:38 · 4 answers · asked by Anonymous

The drawing shows three objects, with m_1 = 12.5 kg and m_2 = 27.5. They are connected by strings that pass over massless and frictionless pulleys. The objects move, and the coefficient of kinetic friction between the middle object and the surface of the table is 0.100.


link to drawing: http://i48.photobucket.com/albums/f226/buttrefly18/untitled-1.jpg

(a) What is the acceleration of the three objects?
(b) Find the tension in each of the two strings.

2007-02-27 11:02:22 · 2 answers · asked by Anonymous

2007-02-27 10:55:52 · 4 answers · asked by Kenneth A 1

why when we flush or run some huge amount of water in the toilet bowl or a sink, the water will always circulate in the motion of clock wise?

2007-02-27 10:52:17 · 2 answers · asked by hollandchua 3

the bullets gotta come back down somewhere eventually

2007-02-27 10:31:30 · 15 answers · asked by Anonymous

2007-02-27 10:27:09 · 1 answers · asked by goring 6

A tether ball leans against the post to which it is attached. The string is attached to the ball such that a line along the string passes through the center of the ball. The string to which the ball is attached has length 1.50 and the ball's radius is 0.111 and has a mass of 0.271 . Neglect any friction between the ball and the pole.

A.What is the tension in the rope?
Take the free fall acceleration to be = 9.80 m/s^2

B.What is the force the pole exerts on the ball?
Take the free fall acceleration to be = 9.80 m/s^2

I found Part A to be 2.66N, but i can't figure out B

2007-02-27 10:11:14 · 5 answers · asked by ♡♥EM♡♥ 4

I dont know how to find the average acceleration during this time interval. Will someone help me?

2007-02-27 10:05:37 · 6 answers · asked by Anonymous

A vertical spring stores 0.962 J in spring potential energy when a 13-kg mass is suspended from it. You can now write two equations: one for the balance of forces on the mass, and another for the energy stored by the spring. This gives you two equations and two unknowns.

(a) How far is the spring stretched by the mass? (m)
(b) What is the spring constant of the spring? (N/m)
(c) By what factor does the spring potential energy change if the mass attached to the spring is multiplied by 4?

I thought I had to start off with 0.962 J = .5kd^2
but I'm not sure where to go from there...

any direction or help would be greatly appreciated. thanks!

2007-02-27 09:58:39 · 2 answers · asked by eureka4sureka 1

Why do they drill Newtonian physics in school if General relativity has replaced it and the Ether doesn't exist, the universe isn't constant? Relativity encompasses Newtonian physics doesnt it?

2007-02-27 09:49:54 · 4 answers · asked by optik_0v3rd0se 2

According to quantum physics, a particle exists as a probability wave function until it is observed, right? So what exactly is an observation?

Is it an observation exclusive to a sentient entity, whether it be direct or indirect (i.e. experimental measurement)? If so, how would a particle "know" it's being observed?

Or is it any interaction with other particles? If so, how can two of the same particles exist anywhere in the universe coexist without somehow interacting? For example, two electrons have electric fields ranging radially outward to infinity, so no matter where they are in relation to eachother, they should always be in contact with regards to their electric forces. Likewise, with any massive particles, gravity would be the common interaction regardless of their relative positions. This being true, wouldn't the wavefunction of every particle in the universe be in a state of constant collapse?

I'm just trying desparately to get a conceptual grasp of this concept. :)

2007-02-27 09:48:03 · 3 answers · asked by frostwizrd 2

If possible, aproximation to the nearest 1000-years or 10,000-years.

2007-02-27 09:31:36 · 8 answers · asked by Anonymous

2007-02-27 09:28:45 · 3 answers · asked by XoSexierDenYewXo 1

2007-02-27 09:14:37 · 4 answers · asked by kevy 1

2007-02-27 08:53:38 · 3 answers · asked by kevy 1

Imagine a very long, uniform wire that has a linear mass density of 0.003 kg/m and that encircles the Earth at its equator. Assume the Earth's magnetic dipole movement is aligned with the Earth's rotational axis. The Earth's magnetic field is cylindrically symmetric (like an ideal bar magnet). The acceleration of gravity is 9.8 m/s2 and the magnetic field of the Earth is 5.0 x 10^-5T. What is the magnitude of the current in the wire that keeps it levitated just above the ground? Answer in units of A, GOOD LUCK!!!

2007-02-27 08:48:06 · 3 answers · asked by smb473 1

density of seawater is 1025kg/cu.m. and g= 9.8 N/kg find the ff?
a. buoyant force of sea water in stone
b. volume of dispaced water
c. volume of the stone

2007-02-27 08:42:54 · 4 answers · asked by eden 2

2007-02-27 08:42:15 · 8 answers · asked by E=MC² 2

the topic is about the fluid pressure!! pls. help me.
Given:
the density of NaCl is 1025 kg/cu. m. ; atmospheric pressure is 75 cm Hg; dHg= 13 600 kg/m3; and g = 9.8 N/kg.

2007-02-27 08:37:22 · 1 answers · asked by eden 2

2007-02-27 08:35:26 · 1 answers · asked by robert l 1

does the photon accelerate? If a photon can't escape a black hole does that same gravity accelerate the photon past the speed of light once it passes the event horizon? Assuming the photon was heading directly into the center of the black hole of course.

2007-02-27 08:26:30 · 7 answers · asked by whoisit13579 1