Aconstant torque of 200nm turns a wheel about its centre. the moment of inertia of it about the axis is 100kgm^s . find the kinetic energy gained after 20 revolutions when it starts from rest.

Astudent creates a model of a closed ecosystem by filling a glass tank half full with water, then adding 10 snails and two small aquatic plants. the next day, all the snails are dead. what is the most likely cause of their death?