GOD DAMN IT! Physics 30

Sir-Ex · 06-25-2011, 10:32 AM

Getting SO fucking angry at my calculator.

Look at this shit.

( 1.6 x 10^(-18) ) / ( 1.6 x 10^(-19) ) = 1 x 10^(-37)

WHAT THE FUCK IS THAT!?!?!?

And another thing. Fucking textbook is fucking me up.

Here's one question, and I swear they've got the wrong answer in the book:

Calculate the net force on a sphere of charge of -5e and mass 2.0 x 10^(-14) kg when placed in an electric field of strength 1.0 x 10^(5) N/C [up] in a vacuum chamber.

Being physics 30, we're required to determine the net force by adding the force of gravity to the electric force. So in this case, it seems the book is getting the direction of the vectors wrong because to my understanding, if the charge is negative (in this case, -5 x (1.6 x 10^(-19) C ) then the direction of the electric force will be opposite the direction of the electric field.

SO since the direction of the field is up, then the direction of the force must be down, right?

But the answer in the book is the one that you'd get if you figured that the direction of the force was up. But how can the direction of the force be up if the direction of the field is up and the charge is negative!? WHAT THE FUCK!?!?!??!

deadhead94 · 06-25-2011, 10:48 AM

Textbooks are full of typos.

Cover your ass and do it both ways?

**Mafoo** · 06-25-2011, 11:11 AM

i got 1*10^1

havent started electricity, thats next quarter for me, but i think theres this right hand rule which might help you

i think it might actually be perpindicular to the field. JUST GUESSING WAIT FOR MORE HELP

if your calc is giving you a different answer buy another one. some calcs have literally no order of operations. they just go from left to right or w/e
the TI-30xIIs is what i use, its like 12 usdollars on campus and most classes allow them

fenderbender · 06-25-2011, 01:06 PM

I stole one of those nice graphing calculators from some bitch who broke my heart.

Fair trade.

those things fucking rock. I just put everything in parentheses or brackets, especially in physics, makes things work out well.

**Mafoo** · 06-25-2011, 01:21 PM

lol i lent mine to this girl and she gave it back to me and it doesnt work. THANKS

probably would have done better on my calc final with that because mine can do integrals. owell

fenderbender · 06-25-2011, 01:43 PM

lol my sister tried to borrow it recently, i was like "lolfuck no". I aint lettin this bitch out of my sight ever.

Captain Cannabis · 06-25-2011, 01:48 PM

TI83+ yo

fenderbender · 06-25-2011, 01:59 PM

TI-84 + Silver Edition

yeah thats right bitch Silver.

Captain Cannabis · 06-25-2011, 02:10 PM

i don't need a calculator to do integrals

Cerpin Taxt · 06-25-2011, 02:25 PM

Cool story bro

**AlteredStateGrl** · 06-25-2011, 03:23 PM

Quote:

Originally Posted by Captain Cannabis

i don't need a calculator to do integrals

well check out the big brain on braaad. you a smart motherfucker, that's right.

Sir-Ex · 06-25-2011, 08:26 PM

Yeah it is supposed to just be 10.

The calculator (it's a ti-83 graphing calc) was running out of batteries and maybe was making some mistakes because of that. Now it gives the correct answer.

As for the question itself, even the documents covering the errata for this textbook don't seem to mention it. Yet somehow by using the procedures that have come to make sense to me, I get every other question in that unit right on the 1st try, so I've just said fuck it, fuck you stupid question, die.

And now it's dead to me.

Goal is to get 100% on the diploma. I will have that 100%.

06-25-2011, 10:32 AM	#1 (permalink)
Sir-Ex Learner Join Date: Jul 2001 Location: Edmonton, Alberta Posts: 11,416 Thanks: 1,726 Thanked 3,817 Times in 2,257 Posts	GOD DAMN IT! Physics 30 Getting SO fucking angry at my calculator. Look at this shit. ( 1.6 x 10^(-18) ) / ( 1.6 x 10^(-19) ) = 1 x 10^(-37) WHAT THE FUCK IS THAT!?!?!? And another thing. Fucking textbook is fucking me up. Here's one question, and I swear they've got the wrong answer in the book: Calculate the net force on a sphere of charge of -5e and mass 2.0 x 10^(-14) kg when placed in an electric field of strength 1.0 x 10^(5) N/C [up] in a vacuum chamber. Being physics 30, we're required to determine the net force by adding the force of gravity to the electric force. So in this case, it seems the book is getting the direction of the vectors wrong because to my understanding, if the charge is negative (in this case, -5 x (1.6 x 10^(-19) C ) then the direction of the electric force will be opposite the direction of the electric field. SO since the direction of the field is up, then the direction of the force must be down, right? But the answer in the book is the one that you'd get if you figured that the direction of the force was up. But how can the direction of the force be up if the direction of the field is up and the charge is negative!? WHAT THE FUCK!?!?!??! __________________ Smile Ditch the cigs!!!!!!

06-25-2011, 11:11 AM	#3 (permalink)
Mafoo nice daze Join Date: Nov 2005 Location: the anguish of anticipated transformation Posts: 5,975 Thanks: 3,776 Thanked 2,652 Times in 1,698 Posts	i got 110^1 havent started electricity, thats next quarter for me, but i think theres this right hand rule which might help you i think it might actually be perpindicular to the field. JUST GUESSING WAIT FOR MORE HELP if your calc is giving you a different answer buy another one. some calcs have literally no order of operations. they just go from left to right or w/e the TI-30xIIs is what i use, its like 12 usdollars on campus and most classes allow them __________________ PLUR* For once you have tasted flight you will walk the earth with your eyes turned skywards, for there you have been and there you will long to return

06-25-2011, 01:21 PM	#5 (permalink)
Mafoo nice daze Join Date: Nov 2005 Location: the anguish of anticipated transformation Posts: 5,975 Thanks: 3,776 Thanked 2,652 Times in 1,698 Posts	lol i lent mine to this girl and she gave it back to me and it doesnt work. THANKS probably would have done better on my calc final with that because mine can do integrals. owell __________________ PLUR For once you have tasted flight you will walk the earth with your eyes turned skywards, for there you have been and there you will long to return

06-25-2011, 01:48 PM	#7 (permalink)
Captain Cannabis safety word: more Join Date: Jul 2001 Location: m.i.a. Posts: 13,922 Thanks: 2,705 Thanked 3,174 Times in 1,812 Posts	TI83+ yo __________________ fuck the monkeys

06-25-2011, 02:10 PM	#9 (permalink)
Captain Cannabis safety word: more Join Date: Jul 2001 Location: m.i.a. Posts: 13,922 Thanks: 2,705 Thanked 3,174 Times in 1,812 Posts	i don't need a calculator to do integrals __________________ fuck the monkeys

06-25-2011, 02:25 PM	#10 (permalink)
Cerpin Taxt Yahookan Zealot Join Date: Jun 2002 Location: Canada Posts: 7,213 Blog Entries: 1 Thanks: 843 Thanked 1,919 Times in 1,011 Posts	Cool story bro __________________ Step Back. Evaluate. Recognize. "All memory is really a form of regurgitation of undigested experience." -Alan Watts

06-25-2011, 08:26 PM	#12 (permalink)
Sir-Ex Learner Join Date: Jul 2001 Location: Edmonton, Alberta Posts: 11,416 Thanks: 1,726 Thanked 3,817 Times in 2,257 Posts	Yeah it is supposed to just be 10. The calculator (it's a ti-83 graphing calc) was running out of batteries and maybe was making some mistakes because of that. Now it gives the correct answer. As for the question itself, even the documents covering the errata for this textbook don't seem to mention it. Yet somehow by using the procedures that have come to make sense to me, I get every other question in that unit right on the 1st try, so I've just said fuck it, fuck you stupid question, die. And now it's dead to me. Goal is to get 100% on the diploma. I will have that 100%. __________________ Smile Ditch the cigs!!!!!!

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