Question

3. 2.5/5 points Previous Answers SerPSE10 8.C.OP.041. My Notes Ask Your Teacher In order for Jane to return to base camp, she needs to swing across a river of width D that is filled with alligators. She must swing into a wind exerting constant horizontal force F, on a vine having length L and initially making an angle with the vertical (see below figure). Take D = 49.0 m, F = 106 N, L = 40.0 m, 0 = 51.0°, and her mass to be 50.0 kg. Wind Jane Tarzan! (a) With what minimum speed (in m/s) must Jane begin her swing to just make it to the other side? (If Jane can make it across with zero initial velocity, enter 0.) 20.39 Consider the system to be Jane and the Earth, with the wind exerting an external force and hence doing work on the system. For convenience, choose the point where the vine is attached to the tree to be the point of zero gravitational potential energy. Write a statement of conservation of energy, and from it, determine the desired speed. m/s (b) Shortly after Jane's arrival, Tarzan and Jane decide to swing back across the river (simultaneously). With what minimum speed (in m/s) must they begin their swing? Assume that Tarzan has a mass of 80.0 kg. 11.31 m/s Need Help? Read It

The answer is NOT 20.39 or 0.361. It should be around 7 but I am not sure how to get there

Answer 1

med m² 50.0 kg 2- 4o.om 0 : 510 È =106N D-49.0m Now D = lsino + 2 sing ya - yoxsin 51 - 4osind sind - 49 - 31.1 - 40 sind - 0.4415 are 027 nitial and final height hi - L i-coso). - 40(1-105515 hi - 14.0 m h - 4.36 m now by energy conservation mghé z nez ImvFD - maht mu - mg (he-hi) + ED - 29 Cheche) 125D L V m V-1279.0 (4.36-14.0+ 2x1068 49 Ve 1.0 m/s