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3 years ago

State what happen to the ammeter reading if rheostat is replaced with a short copper wire

Physics

1 answer:

alex41 [277]3 years ago

6 0

Right now, the rheostat is the ONLY resistance in the circuit. If it's replaced with a short copper wire, then there's no resistance at all between the terminals of the battery.

As soon as you go to close the switch:

-- There's a big spark at the switch.

-- There's an audible "click", as the needle of the Ammeter slams into the peg at the top of its scale. (It's trying to read infinite, or very very large, current.)

-- The meter could burn out very quickly. If it doesn't, then

-- Somewhere between the battery and the Ammeter, or between the Ammeter and the switch, or between the switch and the battery, the WIRE will get very hot, and try to behave like an electric toaster. If the wire is bare, you'll see it glow red. If the wire has plastic or rubber insulation on it, the insulation will smoke.

-- The batteries will get hot, and quickly die.

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An imaginary line perpendicular to a reflecting surface is called _________.

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3 years ago

Read 2 more answers

It takes 300 newtons of force and a distance of 20 meters for a moving car to come to stop

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The answer is 15 I think.

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4 years ago

For atomic hydrogen, the Paschen series of lines occurs when nf = 3, whereas the Brackett series occurs when nf = 4 in the equat

zvonat [6]

Answer:

$(\lambda_{max} )_{brackett} < (\lambda_{min} )_{paschen}$

So the two wavelength range will over lap

Explanation:

The Rydberg equation is given by

$\frac{1}{\lambda} =\frac{2\pi mk^2e^4}{h^3c} t (\frac{1}{n^2_f}-\frac{1}{n^2_i} )$

m is the mass of electron

k = 1/4π∈₀

∈₀ = is the permitivity of free space

e is the charge of electron

h is the plank constant

c is the speed of light in vaccum

z is the atomic number = 1

$\frac{1}{\lambda} =R (\frac{1}{n^2_f}-\frac{1}{n^2_i} )$

where R is the Rydberg constant = 1.097373 × 10⁷m⁻¹

For Paschen series of H spectrum

$n_f = 3$

$n_i = 5,6,7 ...$

in Paschen series of H spectrum

The maximum wavelength occur for $n_i = 4$

$\frac{1}{\lambda_m_a_x } =(1.097373 \times 10^7)(\frac{1}{9} - \frac{1}{16} )\\\\\lambda_m_a_x=1874.6nm$

The minimum wavelength occur for $n_i$ = ∞

$\frac{1}{\lambda_m_i_n } =(1.097373 \times 10^7)(\frac{1}{9} - \frac{1}{_o_o} )\\\\\lambda_m_a_x=820.14nm$

The brackett series of H spectrum

The maximum wavelength occur for $n_i = 4$

$\frac{1}{\lambda_m_a_x } =(1.097373 \times 10^7)(\frac{1}{16} - \frac{1}{25} )\\\\\lambda_m_a_x=4050.05nm$

The minimum wavelength occur for $n_i$ = ∞

$\frac{1}{\lambda_m_i_n } =(1.097373 \times 10^7)(\frac{1}{16} - \frac{1}{_o_o} )\\\\\lambda_m_a_x=1458.03nm$

$(\lambda_{max} )_{brackett} < (\lambda_{min} )_{paschen}$

So the two wavelength range will over lap

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3 years ago

Write the mathemetical relation between work force and displacement

il63 [147K]

Answer:

Work is measured as the product of force and the displacement in the direction of the force. Work = force × displacement in the direction of the force.

8 0

2 years ago

Three struts are pinned together at A, B, and C to form a triangular

ZanzabumX [31]

Answer:

a. Fab = 3000 N tension

Fac = 1500 N compression

Fbc = 3000 N compression

b. Aluminum for AB, titanium for AC and BC.

c. Fc = 4000 N

Explanation:

a. Draw free body diagrams of the pins at A and B, assuming that all internal forces are in tension (pulling away from the pin).

Sum of the forces on A in the x direction:

∑F = ma

H − Fab sin 60° = 0

Fab = H / sin 60°

Fab = 2600 / sin 60°

Fab = 3000 N

Sum of the forces on A in the y direction:

∑F = ma

-Fab cos 60° − Fac = 0

Fac = -Fab cos 60°

Fac = -H / tan 60°

Fac = -2600 / tan 60°

Fac = -1500 N (it's negative, so it's actually in compression).

Sum of the forces on B in the x direction:

∑F = ma

Fab cos 30° + Fbc cos 30° = 0

Fbc = -Fab

Fbc = -H / sin 60°

Fbc = -3000 N (it's negative, so it's in compression)

b. AB is in tension, so it should be aluminum.

AC and BC are in compression, so they should be titanium.

c. Draw a free body diagram of the entire triangle ABC. Assume there is both a horizontal and vertical reaction force at C, and assume they point in the +x and +y directions.

Sum of the forces in the x direction:

∑F = ma

Fcx + H = 0

Fcx = -H

Fcx = -2600 N

Sum of the forces in the y direction:

∑F = ma

Fcy − V = 0

Fcy = V

Fcy = 3000 N

The magnitude of the net force is:

Fc² = Fcx² + Fcy²

Fc² = (-2600 N)² + (3000 N)²

Fc = 4000 N

4 0

3 years ago