While punting a football, a kicker rotates his leg about the hip joint. the moment of inertia of the leg is 3.75 kg⋅m² and its rotational kinetic energy is 175 j.
(a) what is the angular velocity of the leg?
(b) what is the velocity of the tip of the punter's shoe if it is 1.05 m from the hip joint?

(2) (a) you have a simple circuit that consists of only a battery (δvbat=1.5v) and two resistors with resistance r1=10ω and r2=5ω, connected in series with each other. what is the current running through the battery? (b) you re-arrange your circuit so now r2 is attached in parallel to r1 rather than in series. what is the current running through the battery? (c) you add an additional resistor r3=7ω on the same branch as r2. what is the current running through the battery? (d) what is the power dissipated in r3?

A51 kg woman skis down a hill and her kinetic energy is 9.96e4 j. what is her speed?

5400 j of energy are given off when a 50 g of aluminum pan changes temperature. does the temperature of the pan increase or decrease and by how much?