An ice skater starts a spin with her arms stretched out to the sides. she balances on the tip of one skate to turn without friction. she then pulls her arms in so that her moment of inertia decreases by a factor of 4. in the process of her doing so, what happens to her kinetic energy? (a) it increases by a factor of 4. (b) it increases by a factor of 16. (c) it remains constant. (d) it decreases by a factor of 4. (e) it increases by a factor of 16.

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination.at the turning point, how far is the second student from the destination?