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AP Physics 2 Videos 59 videos

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AP Physics 2: 2.5 Object Interaction and Forces 167 Views


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AP Physics 2: 2.5 Object Interaction and Forces. Which of the following changes will increase the power dissipated by the resistor?

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Transcript

00:00

Thank you We sneak And here's your shmoop du jour

00:05

Brought to you by skate parks there's all sorts of

00:09

physics going on at these places mostly the gravitational kind

00:12

of physics course All right The whole skate park is

00:15

watching maria's under pressure and really needs to nail this

00:19

trick Well she sets off build speed and grinds the

00:23

board down a pair of railings Well she makes perfect

00:26

landing in turns to face the cheers Her boards Mel

00:29

bar has a width of d and slides with the

00:33

velocity v across the smooth metal rails All right this

00:38

event occurs under a uniform magnetic field Be directed into

00:41

the page The end of the railing has a resistance

00:45

Are the sliding rod creates emotional e m f mathematically

00:50

expressed as or epsilon equals B devi right Which of

00:55

the following changes will increase the power dissipated by the

00:59

resistor select two answers And here our options decreases and

01:03

increases There we go Well good for maria We tried

01:07

skateboarding for awhile It didn't go quite as well It

01:10

will stick to physic for now And well there's Last

01:12

chance injuries figure out the power dissipated by the resister

01:16

we need to use The right equation that is power

01:20

equals current times voltage And it also equals current squared

01:24

times Resistance Well right off the bat Looking at this

01:27

we can see that decreasing the current won't increase the

01:30

power So answer a isn't one of the right choices

01:33

but let's look at the current in terms of owns

01:35

law Oh does that get according to our body current

01:41

equals electoral motive force over resistance and we know that

01:46

the m f equals magnetic field times distance times velocity

01:51

But we can swap that equation for the imf to

01:54

get a new equation for current Well now we can

01:56

go back to our power equation and put it all

01:58

together Power equals the imf equation squared over the resistance

02:03

squared times resistance Well when we simplify all that we

02:07

see that power equals b d v squared over r

02:10

which means that increasing velocity or distance will increase the

02:15

power dissipated The answer is b and c or the

02:18

right choices Now we just need to give skateboarding another

02:21

shot If you fall off the horse you're supposed to 00:02:23.99 --> [endTime] just get right back on right

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