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3 years ago

Which two statements about an electric motor are true?

Physics

2 answers:

allochka39001 [22]3 years ago

7 0

Options (b) and (d) are correct about an electric motor.

An electric motor is a device which coverts electrical energy into mechanical energy.It works on the principle that when a current carrying coil is placed in a magnetic field, it experiences torque. Because of that torque, the coil rotates and thus the electrical energy gets converted into mechanical (motion) energy.

mojhsa [17]3 years ago

3 0

Answer:

Options (b) and (d) are correct about an electric motor.

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A ball is dropped from a cliff. determine how far the ball fell after 7.5 seconds

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Answer:

The ball fell 275.625 meters after 7.5 seconds

Explanation:

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$V_f=gt$

$\displaystyle y=\frac{gt^2}{2}$

Where $V_f$ is the final speed of the object in free fall, assumed positive downwards, t is the time elapsed since the release and y is the vertical distance traveled by the object

The ball was dropped from a cliff. We need to calculate the vertical distance the ball went down in t=7.5 seconds. We'll use the formula

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$\displaystyle y=\frac{(9.8)(7.5)^2}{2}$

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