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3 years ago

I NEED HELP PLEASE!!!

Physics

1 answer:

Lynna [10]3 years ago

4 0

Answer:

0.784N

Explanation:

f=m×a

m=0.28kg

a=2.8m/s2

f=0.28×2.8

=0.784N

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A beam contains 4.9 × 108 doubly charged positive ions per cubic centimeter, all of which are moving north with a speed of 4.6 ×

Bumek [7]

Answer:

$72.12\ \text{A/m}^2$

south

cross sectional area of the beam

Explanation:

v = Velocity of ions = $4.6\times 10^5\ \text{m/s}$

Number of ions per $\text{cm}^3$ = $4.9\times 10^8$

Charge density would be the product of number of ions per $cm^3$ and the charge of electrons multiplied by 2 as they are doubly charged.

$\rho_q=4.9\times 10^8\times 10^6\times 2\times 1.6\times 10^{-19}\\\Rightarrow \rho_q=0.0001568\ \text{C/m}^3$

Current density is given by

$J=\rho_qv\\\Rightarrow J=0.0001568\times 4.6\times 10^5\\\Rightarrow J=72.12\ \text{A/m}^2$

The current density is $72.12\ \text{A/m}^2$

The direction of the current density is opposite to the movement of the charged particle. The particles are moving north so the direction of current density will be to the south.

Current is given by

$I=JA$

where A is the cross sectional area of the beam .

So the cross sectional area of the beam is required to determine the total current in this ion beam.

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3 years ago

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Amanda [17]

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3 years ago

Why permanent magnets are made up of steels and core of soft iron is made up of soft iron?

Hatshy [7]

An alternating current passes through the primary coil. The alternating current produces a magnetic field that continuously changes direction. The soft iron core increases the strength of the magnetic field.So the transforemer is made of soft iron core.

Retentivity of soft iron is greater than retentivity of steel

soft iron is more magnetised than steel loses its magnetism more rapidly than steel

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3 years ago

By how much should a pair of light rays from a common source differ in distance traveled to produce destructive interference?

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4 years ago

suppose we have two masses m1=2000 g and m2=4000g, where m1 is moving with initial velocity v1,i=24m/s and m2 is at rest at t=0s

Veseljchak [2.6K]

Answer:

The final velocity is 8 m/s and its direction is along the positive x-axis

Explanation:

Given :

Mass, m₁ = 2000 g = 2 kg

Mass, m₂ = 4000 g = 4 kg

Initial velocity of mass m₁, v₁ = 24i m/s

Initial velocity of mass m₂, v₂ = 0