Skier problem...Where to begin??

Question

A skier of mass 69.7 kg is pulled up a slope by a motor-driven cable.
(a) How much work is required to pull him a distance of 59.8 m up a 29.9° slope (assumed frictionless) at a constant speed of 1.90 m/s?
kJ
(b) A motor of what power is required to perform this task?
hp

I am still a little lost. The last answer confused me. However, I tried it and the answer was wrong...any suggestions??

Answer 1

a) really easy, only gravity works: work= 59.8 sin(29.9°) (-g)m ;
b)then you find in how much time it happens, so work/time=power.

Answer 2

He grew to become into skiing on a green run and fell and hit his head perplexing. He fell back on a later run (no longer almost as perplexing) and grew to become into knock subconscious. He grew to become into airlifted to a well being facility and interior of hours from the accident he had recommendations surgical treatment. Then grew to become into in a coma for 2 weeks and the Dr's did no longer comprehend if he grew to become into going to stay or die. He grew to become into donning a helmet yet that did no longer make a difference. What saved him grew to become into the actual incontrovertible fact that he grew to become into 28 years previous. whilst you're making skiers and snowboarders placed on helmets they are going to be renting them on the hill (as my husband did). as quickly as a helmet gets into an accident as quickly as this is now no longer affective. there is not any way for a ski hill to video demonstrate that. i think of helmets are tremendous and if we ever went and skied or snowboarded back we would rather placed on one. My factor is this grew to become right into a thoroughly freak accident and asserting that it would of been prevented had she been donning a helmet isn't the case in any respect.Skiers fall usually devoid of doing any harm. All skiers ought to be made conscious that a head harm could be severe, even nevertheless no longer something exhibits and that they sense nice, and get it regarded at as we communicate. If a skier falls and isn't able to arise or loses awareness, they might desire to be taken care of by utilizing the Ski Patrol and sent for scientific interest. contained with regards to severe skiers, using a helmet ought to be the norm. because they are identifying directly to place themselves right into a intense danger subject, then they might desire to additionally placed on the essential secure practices kit and be arranged to take the implications of any mishaps.

Answer 3

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