What is the ratio of new rotational kinetic energy

Reference no: EM139211

Q1. The rotational inertia of a collapsing spinning star changes to 4/5 its initial value. What is the ratio of new rotational kinetic energy to the initial rotational kinetic energy (KEnew / KEi)?

Q2. A motorist drives south at 27.0 m/s for 3.90 min, then turns west and travels at 25.0 m/s for 2.40 min, and finally travels northwest at 40.0 m/s for 1.00 min. For this 6.40 min trip, find the values.

(a) Total vector displacement m (magnitude) south of west

(b) average speed

Reference no: EM139211

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