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Classical physics

Name: Anonymous 2006-11-13 4:16

A husky exerts a constant horizontal pulling force of 160N over a distance of 15m on a loaded sledge of mass 100kg on snow. The sledge accelerates from rest to a speed of 4.0m/s. What is the work done by the husky against the friction on the sledge?

Name: Anonymous 2006-11-13 5:54

W = FD, so W of Husky = 2400 Newton Meters

Vf^2 = Vi^2 + 2AD
16 = 0 + 2A(15)
A = 16/30

F = MA, so W = MAD. Net work must be = (100)(16/30)(15), which = 800

Since the Husky did 2400 NM, but the net work was 800 NM, friction must've done -1600 NM. Somebody check my work, I've forgotten most of my physics already.

Name: NecroFag 2008-02-22 12:09

.

Name: Anonymous 2008-02-22 12:41

>>1
I hope you fail your homework.

Name: Anonymous 2008-02-22 13:06

>>1
that's so piss easy you should just fucking kill yourself now

Name: Anonymous 2008-02-22 14:40

yea for fucking algebra based physics

Name: Anonymous 2008-02-22 16:01

>>2
1: You stupid asshole. You piece of shit. Use physics symbols.
http://www.rwc.uc.edu/koehler/biophys/symb.html
S = distance, Vf?? Vi?????? WHAT IN THE FUCK???????? Twat.
2: Don't try to prove something like you're a cock sucking bitch with self asteem issues, everyone knows this is just a text book question, just do the math.

F = 160N
S = 15m
M = 100kg
V = 4, V^2 = 16
E = FS = 2400
Ek = 0.5mv^2 = 0.5*100*16 = 800
Energy lost to friction = 2400-800 = 1600 Joules

Name: Anonymous 2008-02-23 1:53

>>7

You're a fucking idiot.  How do you not know that Vf and Vi (V subscript f/i) represent velocity final and initial respectively?  My little sister just learned that Vf^2=Vi^2 + 2ax, and she's in 8th or 9th grade physical science.

And in all the physics classes I've taken, I've never once seen 'S' be the standard to represent distance.  I've seen x, d, and r, and that's it.  And your link proves me right on that one you moron.

Name: Anonymous 2008-02-23 1:59

>>8
>>7
Why the fuck do the variable names matter?

Name: Anonymous 2008-02-23 2:04

>>9

Well, technically they don't.  However, at higher levels having a set standard really does make everything much easier for everyone involved.  Main reason I posted was because >>7 was acting like a hypocritical douche bag, and I wanted to throw it in his face.

Name: Anonymous 2008-02-23 4:43

>>8
I'm right.
http://www.rwc.uc.edu/koehler/biophys/symb.html
It's official.

Name: Anonymous 2008-02-23 15:28

>>8
S is used for distance in calculus.

Name: Anonymous 2008-02-23 19:17

>>11
D = distance

Name: Anonymous 2008-02-23 19:18

Is there like a universal code of science symbols or something? Or what?

Name: Anonymous 2008-02-23 19:19

>>14
http://physics.nist.gov/cuu/Units/index.html

Name: Anonymous 2008-02-23 19:22

>>15
Those are units not properties. I want to say distance/time not metres/second.

Name: Anonymous 2008-02-24 16:45

S= distance
D= displacement

Name: Anonymous 2008-02-24 17:17

It's simpler than >>2 makes it out.

Work by husky = energy used by husky = 160 * 15 = 2400
Kinetic energy of sledge = 1/2 * 100 * 4^2 = 800

Work against friction = 2400 - 800 = 1600
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