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4 years ago

Is the universe infinite

Physics

2 answers:

Softa [21]4 years ago

6 0

Answer:

The observable universe is still huge, but it has limits. because it's most likely like an plane all round.

Explanation:

Sedaia [141]4 years ago

4 0

Answer:

Yes

Explanation:

the universe is constanlty expanding at a rate of 74.3 plus or minus 2.1 kilometers (46.2 plus or minus 1.3 miles) per second per megaparsec (a megaparsec being about 3 million light-years).

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A solid nonconducting sphere of radius R carries a charge Q distributed uniformly throughout its volume. At a certain distancer1

Jobisdone [24]

Answer:

The magnitude of the electric field in the second case will be $\frac{1}{8}$ of the electric field in the first case

Explanation:

The electric field at a distance $r_1$ < R from the center of the sphere is given by

the formula $E_1$ = $\frac{kQr_1}{R^3}$

where R is the radius of the sphere, and, Q is the charge uniformly distributed on the sphere.

It is given that the same charge Q is distributed uniformly throughout a sphere of radius 2R and we have to find the electric field at same distance $r_1$ from the center.

In the second case the electric field will be given by

$E_2$ = $\frac{kQr_1}{(2R)^3} = \frac{kQr_1}{8R^3} =\frac{1}{8} \frac{kQr_1}{R^3} = \frac{1}{8} E_1$

Therefore the magnitude of the electric field in the second case will be $\frac{1}{8}$ of the electric field in the first case.

4 0

4 years ago

The average adult in the US watches _____ hours of television each week.

Shkiper50 [21]

The average adult in the us spends 24 hours watching televistion each week

8 0

4 years ago

Read 2 more answers

6th grade science please help !

Len [333]

Answer:

i cant see it just put the question

Explanation:

8 0

3 years ago

Read 2 more answers

the equation of motion is given for a particle when s is in meters and t is in seconds. Find the acceleration after 4.5 seconds

ki77a [65]

Answer:

Explanation:

The question is incomplete.

The equation of motion is given for a particle, where s is in meters and t is in seconds. Find the acceleration after 4.5 seconds.

s= sin2(pi)t

Acceleration = d²S/dt²

dS/dt = 2πcos2πt

d²S/dt² = -4π²sin2πt

A(t) = -4π²sin2πt

Next is to find acceleration after 4.5 seconds

A(4.5) = -4π²sin2π(4.5)

A(4.5) = -4π²sin9π

A(4.5) = -4π²sin1620

A(4.5) = -4π²(0)

A(4.5) = 0m/s²

4 0

3 years ago

Electromagnetic waves propagate much differently in conductors than they do in dielectrics or in vacuum. If the resistivity of t

evablogger [386]

Answer:

Del(ρ/ε₀) - (Del)²E = -dμ₀J/dt

Explanation:

From Maxwell's fourth equation

Curl B = μ₀J + μ₀ε₀dE/dt (1) where the second term is the displacement current.

If the oscillation conduction current in the conductor is much larger than the displacement current then, the displacement current goes to zero. So we have

Curl B = μ₀J (2)(since μ₀ε₀dE/dt = 0)

From maxwell's third equation

Curl E = -dB/dt (3)

taking curl of the above from the left

Curl(Curl E) = Curl(-dB/dt)

Curl(Curl E) = (-d(CurlB)/dt) (4)

Substituting for Curl B into (4), we have

Curl(Curl E) = -dμ₀J/dt

Del(DivE) - (Del)²E = -dμ₀J/dt (5)

From Maxwell's first equation,

DivE = ρ/ε₀

Substituting this into (5), we have

Del(ρ/ε₀) - (Del)²E = -dμ₀J/dt

4 0

3 years ago