Work Problem, opposing forces (no friction)

[Bones]

Homework Statement

In the figure below,

http://www.webassign.net/userimages/jshemwell@lincolnpark.il/Net%20Force/Two_opposing_horizontal.gif

T1 = 32 N, and T2 = 19 N. The surface has no friction. The block travels a displacement of 11 m to the right as a result of these forces.
a. What is the work done on the block by T1?

b. What is the work done on the block by T2?

c. What is the work done on the block by gravity?

d. What is the work done on the block by the normal force?

e. What is the net work done on the block by all forces?

Homework Equations

The Attempt at a Solution

I got (32N)(11m)(Cos0)=325 J for a.
I got (19N)(11m)(Cos180)=-290 J for b.
I got 0 for c. and d.
I am not sure how to find e. and did I do the rest of the problems correctly?

 

[Bones]

Never mind, I figured it out ;)

 

[baba89]

Your calculations for parts a and b are correct. For part c, you are correct that the work done by gravity is 0 since the displacement is horizontal and gravity acts vertically. For part d, the work done by the normal force is also 0 since it is perpendicular to the displacement.

For part e, the net work done on the block is the sum of the work done by all forces. So you can simply add the values you calculated for parts a and b. The net work done would be 325 J + (-290 J) = 35 J.

In terms of whether your calculations are correct, it's important to pay attention to the direction of the displacement and the angle between the force and displacement. In this case, the displacement is to the right and both forces are acting horizontally, so the angle between them would be 180 degrees. Also, make sure to use the appropriate trigonometric function (cosine or sine) depending on the angle given in the problem.