A 30kg child sits on the edge of a merry go round of radius 3 m. a) What is his moment of inertia?

b)If we consider the child to be a point mass (l=mr^2)
,what is his moment of inertia?

Steam is generated in a boiler of a cogeneration plant at 10 mpa and 450°c at a steady rate of 5 kg/s. in normal operation, steam expands in a turbine to a pressure of 0.5 mpa and is then routed to the process heater, where it supplies the process heat. steam leaves the process heater as a saturated liquid and is pumped to the boiler pressure. in this mode, no steam passes through a condenser, which operates at 20 kpa. (a) determine the power produced in the turbine and the rate at which process heat is supplied in this mode. (b) determine the power produced in the turbine and the rate of process heat supplied if only 60 percent of the steam is routed to the process heater and the remainder is expanded to the condenser pressure. (3.32 mw; 9.69 mw; 4.25 mw; 5.82 mw)

Does anyone have the answers to online physics course plato course physics, semester a v3.0

Which lists the pairs of plates in order from least to greatest in terms of the work done to move the electron?