Homework Statement
An aircraft engine akes in 9000 Joules of heat and discards 6400 J each cycles a) What is the mechanical work output of the engine during one cycle? b) What is the thermal efficiency of the engine?
Homework Equations
e=W/Qh
The Attempt at a Solution
A)
Qh =...
Homework Statement
A child sits on a sled that rests on a snow-covered hill making an angle of 30 degree with the horizontal. The mass of the child and sled is 50 kg. if the coefficient of friction is 0.15, what is the acceleation of the sled down the hill?
Homework Equations
I'm trying...