A spring-damper system is designed to support an electric motor which has a total mass of 20 kg and a rotor of 12 kg. Initially, the system has a static deflection of 5 mm after the motor is mounted on the springdamper support, and the center of the rotor is 3 mm misaligned. In free vibration, a displacement of 10 mm is damped to 1 mm in two cycles. Determine the amplitude of the force transmitted to the ground through the spring-damper support system when the motor is operating at 1,200 rpm.

Cells in the nervous system have a potential difference of 70 mv across the cell membrane separating the interior of the cell from the extracellular fluid. this potential difference is maintained by ion pumps that move charged ions across the membrane. is this an emf? select the correct answer and explanation. 1)no. the ion pumps cannot separate charges; thus, they cannot create a potential difference. 2)yes. the ion pumps cannot separate charges, but they still can create a potential difference. 3)yes. the ion pumps can actively separate charge; thus, they can create a potential difference. 4)no. the ion pumps can separate charges, but they cannot create a potential difference.