Each year at a college, there is a tradition of having a hoop rolling competition. alex rolls his 0.350 kg hoop down the course. if the hoop has a radius of 75.0 cm, what is the moment of inertia of alex's rolling hoop?
a) 1,970 kg ⋅ m2
b) 26.3 kg ⋅ m2
c) 0.263 kg ⋅ m2
d) 0.197 kg ⋅ m2

In a particular chemical reaction, the energy of the reactants is 30 kj and the energy of the products is 5 kj. 
 the maximum energy of the system is 40 kj. sketch a potential energy diagram for this reaction. make sure to label the energy of the reactants, the energy of the products, the activation energy, and the enthalpy change for the reaction.