A bicycle wheel of radium R= 37 cm and mass M= 2.7 kg is at rest against a step of height r=0.60 R, as illustrated in attached photo.
a. Find the minimum horizontal force F that must be applied to the axle to make the wheel start to rise up over the step. (Please show your work here, as I really need help with understanding and care less about the answer)
b. As the wheel moves up the step, does the minimum horizontal force required to keep it oving increase, decrease or stay the same? Explain. (I think it decreases, but I'm not sure why?)
c. Now the bike wheel has just reached the top of the step, having been lifted there by a constant horizontal force of 72 N. Find the speed of the wheel. Assume that the wheel is a hoop of mass M and radium R.
