Calculate the angular momenta of
a. a mass of 450 g rotating on the end of a string of length 1.5 m at 2 revolutions s−1 .
b. a homogeneous sphere of radius 3.0 cm and mass 0.25 kg spinning at 50 revolutions s−1 about an axis that passes through its centre of mass.
c. a uniform cylinder of mass 4.0 kg and radius 4.0 cm spinning about its long axis at 20 revolutions s−1 .