# AP Physics 2: 2.5 Object Interaction and Forces

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

AP Physics 2 | Object Interaction and Forces |

Language | English Language |

Science Practice 3 | Engaging in scientific questioning |

### Transcript

trick Well she sets off build speed and grinds the

board down a pair of railings Well she makes perfect

landing in turns to face the cheers Her boards Mel

bar has a width of d and slides with the

velocity v across the smooth metal rails All right this

event occurs under a uniform magnetic field Be directed into

the page The end of the railing has a resistance

Are the sliding rod creates emotional e m f mathematically

expressed as or epsilon equals B devi right Which of

the following changes will increase the power dissipated by the

resistor select two answers And here our options decreases and

increases There we go Well good for maria We tried

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

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

chance injuries figure out the power dissipated by the resister

we need to use The right equation that is power

equals current times voltage And it also equals current squared

times Resistance Well right off the bat Looking at this

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

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

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

law Oh does that get according to our body current

equals electoral motive force over resistance and we know that

the m f equals magnetic field times distance times velocity

But we can swap that equation for the imf to

get a new equation for current Well now we can

go back to our power equation and put it all

together Power equals the imf equation squared over the resistance

squared times resistance Well when we simplify all that we

see that power equals b d v squared over r

which means that increasing velocity or distance will increase the

power dissipated The answer is b and c or the

right choices Now we just need to give skateboarding another

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