• LAVA Moderator: Shinji Ikari

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I can't figure this out for the life of me, my brain is switched to off at the moment so any help would be much appreciated:

A light rope is attached to a block with a mass of 4kg that rests on a horizontal frictionless surface. The rope passes over a frictionless, massless pulley and a block with mass m is suspended from the other end.
When the blocks are released the tension on the rope is 10N.

What is the acceleration of either block (2.5 m/s^2)
 
Okay, well you don't need to know m, as this is implicit in the tension (often in this kinda problem you get m and have to find T).

So apply Newton's Second Law: sum(F)=ma to a free-body diagram of the 4kg block.

Since there is no friction, sum(F)= T = 10N. Meaning 10=4*a, or a=10/4 or 2.5.

For the units, 1N = 1kg*m/s^2. So you should see where it all falls out from there :)
 
:) Freshman physics?

Technically we're not allowed to do other people's homework for them in this forum, so let's not make a habit of this (or just pretend to be really nerdy and doing it FOR FUN!). But we can give hints and such. So in the future, feel free to post stuff in E&C that you need help with (I minored in physics so I know this stuff, and Binge Artist is really smart too), but really it might just have to be about hints and stuff.

Good luck with the rest of your assignment!
 
:) Freshman physics?

Technically we're not allowed to do other people's homework for them in this forum, so let's not make a habit of this (or just pretend to be really nerdy and doing it FOR FUN!). But we can give hints and such. So in the future, feel free to post stuff in E&C that you need help with (I minored in physics so I know this stuff, and Binge Artist is really smart too), but really it might just have to be about hints and stuff.

Good luck with the rest of your assignment!



Essentially yeah, its the intro physics course here.
Technically that's not my homework, just some review problems that our quiz problems may happen to resemble ;)
I'm bound to need more help so thanks.
 
^haha.

Another BA FYI:

One of my favorite mathematical jokes is this:
1, 2, 3...4.

I put it in my papers whenever the opportunity arose. At Columbia, it got me a few "smiley faces", but at Ball State, it got me a few reprimands.
 
I put a footnote in my undergrad thesis "rough draft" which read:

"The upcoming section is extremely important, so I'd suggest you take a restroom break now if you need one. Or print out a second copy if you'd like some reading material."

I just got a red x over it. No comments. Just an x.
 
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