Solving quadratic equations by factorization: 2x^2+5x-7=0 (step by step)

Mathematics

1 answer:

ch4aika [34]4 years ago

5 0

Answer:

x = 1 ; x = -7/2

Step-by-step explanation:

$2x^2 + 5x - 7=0\\=> 2x^2 - 2x + 7x - 7=0\\=> 2x(x - 1) + 7(x - 1)=0\\=> (x - 1) (2x + 7)=0\\$

Here the sol. of x =

1) x - 1 = 0

=> x = 1

2) 2x + 7 = 0

=> 2x = -7

=> x = -7/2

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In a physics laboratory experiment, a coil with 200 turns en-closing an area of 12 cm2 is rotated in 0.040 s from a position whe

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Answer: (a) Magnetic flux before rotation is 7.2 × 10^-8 Wb and magnetic flux after rotation is 0

(b) The average emf induced in the coil is 3.6×10^-4 V

Step-by-step explanation:

Here is the complete question:

In a physics laboratory experiment, a coil with 200 turns en-closing an area of 12 cm2 is rotated in 0.040 s from a position where its plane is perpendicular to the earth’s magnetic field to a position where its plane is parallel to the field. The earth’s magnetic field at the lab location is 6.0×10^−5T. (a) What is the total magnetic flux through the coil before it is rotated? After it is rotated? (b) What is the average emf induced in the coil?

Step-by-step explanation: Please see the attachments below