The Work Done in Pulling a Supertanker

[rock_star]

Homework Statement

Two tugboats pull a disabled supertanker. Each tug exerts a constant force of 1.90×10^6 N , one at an angle 13.0 degrees west of north, and the other at an angle 13.0 degrees east of north, as they pull the tanker a distance 0.840 km toward the north.

Homework Equations

The Attempt at a Solution

2 * (1.90×10^6 N) * cos(13) * 0.84 * 10^3 = 2.9 * 10 ^9

can anyone tell me where I did a mistake?

Thanks a lot before hand

 

[rock.freak667]

It does not look like you made a mistake.

 

[turin]

Homework Statement

Two tugboats pull a disabled supertanker. Each tug exerts a constant force of 1.90×10^6 N , one at an angle 13.0 degrees west of north, and the other at an angle 13.0 degrees east of north, as they pull the tanker a distance 0.840 km toward the north.

The Attempt at a Solution

Solution to what?

 

[rock_star]

It does not look like you made a mistake.

It is showed that I made a mistake :(
Rounding error..
It is 3.11 not 2.9 :(

Thanks a lot though! :)

 

[Woolie]

The correct answer is 3.11E+9. Make sure you use 13 DEGREES and not 13 RADIANS. If you entered into a *dumb* calculator, it usually assumes radians. Try writing

2*1.9E6*cos(13*pi/180)*0.84E3 into google, and it gives you the right answer.