Each year at a college, there is a tradition of having a hoop rolling competition. Alex rolls his 0.250 kg hoop down the course. If the hoop has a radius of 50.0 cm, what is the moment of inertia of Alex’s rolling hoop?

i don't understand. explain it clearly

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles