Question #bcfc2

1 Answer
Antoine
May 3, 2015

Here's my go:

enter image source here

Applying Newton's 2nd law up the mountain plane,

#ma=F-mgsintheta#

constant speed means that #a=0#

#1:100# means that the height increases by #1km# for every #100km# travelled up the plane of the mountain

enter image source here

So, #sintheta=1/100#

#P=Fv=>F=P/v#

#=>0=P/v-mgsintheta#

#=>P=mgvsintheta=30000xx9.8xx((30*1000)/(3600))xx1/100#

#=>P= 24500"W" = 24.5 "kW"#

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