Question

A 70.0 kg sailor climbs a 28.3 m rope ladder at an angle of 45.0° with the mast. How much work did he do?

A. 19,400 J
B. 686 J
C. 1,400 J
D. 13,700 J

:/

Answer 1

the requested work W is:
\[W = mgd\cos \left( {45} \right) = 70 \times 9.81 \times 28.3 \times \cos 45\]

Answer 2

since we havfe to consider the projection of the weight force, along the direction of the displacement

Answer 3

have*

Answer 4

ohh okay! and so we calculate and get 13741? so our solution is D? 13,700 J since it is approximation?

Answer 5

yes!

Answer 6

yay!! thank you!!

Answer 7

ok! :)