The pendulum consists of a slender 6-kg rod ab and 9-kg disk. it is released from rest without rotating. when it falls 0.3 m, the end a strikes the hook s, which provides a permanent connection. determine the angular speed of the pendulum after it has rotated 90 degree. treat the pendulum's weight during impact as a non-impulsive force.

At 12 noon, the count in a bacteria culture was 400; at 4: 00 pm the count was 1200 let p(t) denote the bacteria cou population growth law. find: (a) an expression for the bacteria count at any time t (b) the bacteria count at 10 am. (c) the time required for the bacteria count to reach 1800.

The proportional limit is always greater than the yield strength for a material. a)-trune b)- false

An electric motor is used to drive a power press which makes steel turning moment diagrams 323 pressings from a metal sheet. the motor runs at a mean speed of 50 rev/s. the torque required is 10.0nm for 0.2s, followed by 1.0nm for0.3 s with this sequence then being repeated. what is the minimum power required of the motor and the moment of incrtia required for the t1ywhcel if the speed fluctuations are to be restricted to 1.5%?