Posted by Technoboi11 on Saturday, March 3, 2007 at 2:10pm.
What work is done by a force (in newtons) F = 3.1xi + 3.1j, with x in meters, that moves a particle from a position r1 = 2.1i + 2.5j to r2 = - -4.9i -3.9j?
For Further Reading
* Physics/Math - bobpursley, Thursday, March 1, 2007 at 6:27am
Work is the dot product of Force and displacement.
Change in displacement is r2 minus r1. I will be happy to critique your work on this.
Rememeber dot product is a scalar, the sum of i component times i component plus j component times j component etc.
Here is what I did:
W1=integral of Fxdx = integral (3.1x)dx
= 1.55x^2 evaluated at x2=-4.9 and x1=2.1.
= 30.38 J
W2=integral of Fydy = integral (3.1)dy
= -19.84 J
Wnet = W1+W2
Wnet = 30.38-19.84
Wnet = 11 J
Is this correct???
The procedure you set up is correct. I dont have a calculator here, so I didn't check math.
What is wrong with my thinking here???
I got the right answer...stupid careless error on my behalf.
The only thing I see "wrong" is the 11 J is a rounded number.
Answer this Question
physics - if a particle has work of 8J and doubles its speed. how much work it ...
physics......PLEASE HELP!! - A steam engine absorbs 1.98*10^5 J and expels 1.49*...
Physics - Which of the following is true? a. Conserved forces cannot do work b. ...
Physics - A grocery cart with a mass of 18 kg is pushed at constant speed along ...
11th garde physics - A grocery cart with a mass of 18 kg is pushed at constant ...
PHYSICS HELP - I am having a real problem with this question. Through the ...
Re: Physics/Math - A single force acts on a 5.0 kg particle-like object in such...
Physics - An object of mass .550kg is lifted from the floor to a height of 3.5m ...
Chem/Physics - 1. How much work is necessary to accelerate a bullet having a ...
Physics - please check these: In which of the following sentences is WORK used ...