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Several bacteria are propelled by biological motors that spin hair-like flagella. A typical bacterial motor turning at a constant angular velocity has a radius of 1.22*10-8 m, and a tangential speed at the rim of 2.41*10-5 m/s.
1. What is the angular speed (the magnitude of the angular velocity) of this bacterial motor?
2. How long does it take the motor to make one revolution?
A 21.5 g bullet strikes a 0.650 kg block attached to a fixed horizontal spring whose spring stiffness constant is 7.30 x 10^3 N/m and sets it into vibration with an amplitude of 21.5 cm. What was the speed of bullet before impact if the bullet and bl..
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