Recent content by cerberus9

Homework Statement Consider a common mirage formed by superheated air just above a roadway. A truck driver whose eyes are 2.00 m above the road, where n=1.0003 looks forward. She has the illusion of seeing a patch of water ahead on the road, where her line of sight makes an angle of 1.20...

i don't. >.<

but it starts when she finishes the race. so i should have her initial velocity be the speed she finishes the race at, no?

I reeeeeeeeally need help with thiss. thanks :) Homework Statement A track runner finishes a race and begins to slow down in a uniform manner. In 3.50 seconds, she comes to a complete stop, covering 12.0 meters while doing so. What was her speed when she finished the race? Homework...

thanks a bunch :biggrin:

haha no, don't be upset, you're right. that's the answer in the back of the book. I'm just totally lost as to how to get to it.

how did you get 12 J?

Homework Statement There were two parts to this problem a) if you do 12 J of work to push 0.001 C of charge from point A to point B in an electric field, what is the voltage difference between A and B? I already solved this part, I got \DeltaV=12,000 V b) When the charge is...

1.8 m/s isn't a time, it's a rate. we're solving for a rate. that's John's rate, we don't want that. We want Jane's rate. So using the time and distance, what answer do you get?

don't worry about converting things like that, it'll just confuse you tons more haha. :wink:

well what equations are there that involve distance, velocity, and time?

thanks :) and sorry about the "powerful" thing, I just wasn't sure about what word to use.

well jane will be walking in a straight line, no? so all you have to do is solve. you have the displacement and the time. :smile:

it's not a square because John walks 1.60 km north and 1.40 km east. Those are different lengths of the sides, so it's not a square. but you still get a triangle when you put the two paths together haha.

So if you had a relatively small charge in a very powerful space, then the electric potential would be high and the electric potential energy would be low?