Question1
Two blocks are linked by a light string that passes over a frictionless pulley. The block of mass 9.84 kg lies on a horizontal surface and is associated to a spring of force constant 313 N/m. The system is released from rest while the spring is unstretched. If hanging 13.8 kg block falls a distance 0.633 m before coming to rest, analyse the coefficient of kinetic friction between the block m1 and surface. The acceleration of gravity is 9.8 m/s2.
Question2
A 70 kg bicyclist rides his 7.8 kg bicycle with a speed of 16 m/s.
1) How much works have to be done by the brakes to bring the bike and rider to a stop?
2) How far does bicycle travel if it takes 4.5 s to come to rest?
3) What is magnitude of the breaking force?