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Thepotemich [5.8K]
3 years ago
11

Physics help, thank you guys so much!

Physics
1 answer:
katrin2010 [14]3 years ago
4 0

Answer:

 Δt = 5.85 s

Explanation:

For this exercise let's use Faraday's Law

           emf = -  \frac{d \phi}{dt} -  d fi / dt

           \phi = B. A

           \phi = B A cos θ

The bold are vectors. It indicates that the area of the body is A = 0.046 m², the magnetic field B = 1.4 T, also iindicate that the normal to the area is parallel to the field, therefore the angle θ = 0 and cos 0 =1.

suppose a linear change of the magnetic field

            emf = - A \frac{B_f - B_o}{ \Delta t}

             Dt = - A  \frac{B_f - B_o}{emf}

the final field before a fault is zero

       

let's calculate

            Δt = - 0.046 (0- 1.4) / 0.011

            Δt = 5.85 s

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Average power is defined as the ratio of total work done by the body to the total time taken by the body.

Average power P avg = W / ΔT Watt

W - Work in One revolution

For first one half revolution,

W = 2 NIAB

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For full revolution,

W = 2 × 1.2 × 10⁻³ J

   = 2.56 × 10⁻³ J

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Time for one revolution is  Δt = 60/3600 = 1/60s

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                          = 2.56 x 10⁻³ / (1/60)

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The average power of the motor is 0.153 Watt.

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True

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From equation (1), the speed of the satellite depends only on the mass of the earth and the orbital radius.

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Answer:

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