Physics

A book whose mass is 3 kg is projected up a long 40 degree incline with an initial speed of 25 m/s The coefficient of kinetic friction between the book and the Mane is 0.20.
a. Find the magnitude of the friction force acting on the book as it moves up the plane.
b. For how much time does the book move up the plane?
c. How far does the book move up the plane?
d. How much time does it take the book to slide from its position in part (c) back to its starting point?
e. With what speed does it arrive at this point?


A car weighing 9800 N moves around a circular track of 70 m in 60 s.
a. What is the speed or the car?
b. What is the centripetal acceleration?
c. What is the centripetal force?
d. What is the coefficient of friction between the tires and the road?


What is the kinetic energy of the mass at the bottom.
That kenergy must equal mgh (Potential energy gained) + frictional losses (mu*mg*SinTheta*distance) where distance = h/sinTHeta.

I will be happy to critique your thinking on the rest.

Thanks, I will have an Exam tomorrow, so Please, tell me how to do it!!!

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asked by QT

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