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2 years ago

Select the correct answer.

Physics

2 answers:

umka2103 [35]2 years ago

7 0

Hi,

The answer you are looking for is

a person carrying a box from one place to another

This is because the box is being carried at a constant velocity so, there is no force it needs to keep it it motion.

Have a great day!

ivolga24 [154]2 years ago

4 0

I Believe the answer is Carrying the box because he isnt using any force like having to (Pick up) , (Pushing) or (Pulling).

Hope this Helps Dante -

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3 years ago

Read 2 more answers

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Answer:

See answer

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$A = \pi r^2$

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$d\vec{A}$ is parallel to $\vec{B}$ and $\vec{B}$ is constant in magnitude and direction therefore:

$\phi = \int \vec{B} \cdot d\vec{A}= \int BdAcos(0)= B\int dA= B*(\pi r^2)= \pi Br^2$

Part A)

initially the flux is $\phi =\pi B r^2$

after the interval $\Delta t= 2.4 [m/s]$

the flux is

$\phi = 0$

now, the EMF is defined as:

$\epsilon =- \frac{d \phi}{dt}$ ,

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$\epsilon =- \frac{\Delta \phi}{\Delta t}$

$\Delta \phi = 0 - \pi B r^2=-\pi (1.7) (0.15)^2=-0.12$

then:

$\epsilon =- \frac{-0.12}{0.0024} = 50 [V]$

Part B)

When looked down from above, the current flows counter clockwise, according to the right hand rule, if you place your thumb upwards (the direction of the magnetic field) and close your fingers, then the current will flow in the direction of your fingers.

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