18.6k views
4 votes
Before railroad were invented, goods often traveled along canals, with mules pulling barges from the bank. If a mule is exerting a 12,000N force for 10km, and the rope connecting the mule to the barge is at a 20 degree angle from the direction of travel, how much work did the mole do on the barge?

A. 12MJ
B. 11MJ
C. 4.1MJ
D. 6MJ

User ChristDist
by
7.0k points

1 Answer

3 votes

Answer:

W = 112.76MJ

Step-by-step explanation:

the work is:


W = F_xD

where
F_x is the force executed in the direction of the displacement and the d the displacement.

so:

W = 12000Ncos(20)(10000)

we use the cos of the angule because it give us the proyection in the axis x of the force, that means the force in the direction of the displacement.

W = 112.76MJ

User Jcw
by
6.3k points