Today I read articles and texts about Dirac monopoles and I have been wondering about the insistence on gauge potentials. Why do they seem (or why are they) so important to create a theory about magnetic monopoles?
And more generally, why do we like gauge potentials so much?
In: Physics
A particle carrying charge +q is located on the xaxis at x=+d. A particle carrying charge ?3q is located on the x axis at x=?7d.
A. With zero potential at infinity, at what location on the x axis with negative coordinate is the electrostatic potential zero? Express your answer in terms of d.
B. With zero potential at infinity, at what location on the x axis with positive coordinate is the electrostatic potential zero? Express your answer in terms of d.
C. At what location on the y axis with negative coordinate is the potential zero? Express your answer in terms of d.
D. At what location on the y axis with positive coordinate is the potential zero? Express your answer in terms of d.
E. Are there any locations on the x or y axis where the electrostatic potential is zero?
In: Physics
A)How long (in ns) does it take light to travel 1.00
m in vacuum?
B) What distance does light travel in water during the time that it travels 1.00
m in vacuum?
C) What distance does light travel in glass during the time that it travels 1.00
m in vacuum?
In: Physics
A projectile is fired with an initial speed of 36.4 m/s at an angle of 43.0 ∘ above the horizontal on a long flat firing range.
A) Determine the maximum height reached by the projectile.
B) Determine the total time in the air.
C) Determine the total horizontal distance covered (that is, the range).
D)Determine the speed of the projectile 1.50 s after firing.
In: Physics
Background
As seen on this picture of the cosmic microwave background (take from the Wikipedia entry on the very same topic) there exists irregularities in the distribution of matter: Cosmic microwave background. Boom baby!
To my knowledge, this is because the Universe wasn't formed with
all the matter (or whatever you should call whatever existed right
after the big bang) in a completely regular pattern (or if it was
the case that anti-matter had this big fight with ordinary matter
after the Big Bang, it's really not that important I guess), and I
guess this is the reason why we have a highly diverse universe
today, inhabited by galaxies, black holes, and Justin Bieber.
Question
What would the Universe look like if there were no irregularities in it from the get-go? Would we have a big massive black hole in the middle (if one even can talk about a middle), would the Big Bang never happen, or have I just misunderstood the whole thing, making my question completely nonsensical?
In: Physics
how does the specific heat of water compare with that of various metals? Why?
In: Physics
A 2.7-kg block is hanging stationary from the end of a vertical spring that is attached to the ceiling. The elastic potential energy of the spring/mass system is 2.6 J. What is the elastic potential energy of the system when the 2.7-kg block is replaced by a 5.5-kg block?
In: Physics
Please show Each Formula and Each Step used to obtain the answer(s).
How many 18 Watt light bulbs can be operated on a 120- Volt circuited protected bya a 23.4 Ampere fuse? Write answer(s) to two decimal places and in the form of (1.6E-19) if applicable/where needed.
In: Physics
If the density of the universe great than a critical value, then
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it might continue expanding forever. |
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it could expand to a fixed size and remain. |
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it might eventually stop expanding and start collapsing. |
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there's probably less dark matter than luminous. |
In: Physics
A 16.4-kg block rests on a horizontal table and is attached to one end of a massless, horizontal spring. By pulling horizontally on the other end of the spring, someone causes the block to accelerate uniformly and reach a speed of 4.50 m/s in 1.55 s. In the process, the spring is stretched by 0.236 m. The block is then pulled at a constant speed of 4.50 m/s, during which time the spring is stretched by only 0.0565 m. Find (a) the spring constant of the spring and (b) the coefficient of kinetic friction between the block and the table.
In: Physics
A charge of -2.75 nC is placed at the origin of an xy-coordinate system, and a charge of 2.05 nC is placed on the y axis at y = 3.60 cm .
A. If a third charge, of 5.00 nC , is now placed at the point x = 2.65 cm , y = 3.60 cm find the x and y components of the total force exerted on this charge by the other two charges.
B. Find the magnitude of this force.
C. Find the direction of this force.
In: Physics
1) Two vectors, r and s lie in the x y plane. Their magnitudes are 4.84 and 6.09 units respectively, and their directions are 341o and 65.0o respectively, as measured counterclockwise from the positive x axis. What are the values of vectors (a) r . s and (b) | r × s |?
2) For the following three vectors A B C, what is 3⋅C . (3A × B)
?
A =3.00î + 2.00ĵ - 3.00k̂
B =-4.00î + 3.00ĵ + 3.00k̂
C =6.00î - 7.00ĵ
In: Physics
a) How much heat is required to change a 31.3 g ice cube from ice at -10.6°C to water at 47°C? (if necessary, use cice=2090 J/kg°C and csteam= 2010 J/kg°C) b)How much heat is required to change a 31.3 g ice cube from ice at -10.6°C to steam at 110°C?
In: Physics
Two hockey pucks are moving to the right with puck 1 behind puck 2. Puck 1 is moving twice as fast as puck 2, but its mass is half that of puck 2. If puck 2's Vi is 8 m/s, then what is the velocity of each puck after they collide?
In: Physics
A man stands on the roof of a building of height 16.8m and throws a rock with a velocity of magnitude 30.6m/s at an angle of 29.3? above the horizontal. You can ignore air resistance.
Calculate the magnitude of the velocity of the rock just before it strikes the ground.
Calculate the horizontal distance from the base of the building to the point where the rock strikes the ground.
In: Physics