Which of the following is an example of a reliable source?
A. A pamphlet on the economics of bridge building published by the organization
Citizens Against Government Spending.
B. An article in Environmental Science and Technology, a peer-reviewed journal
published by the American Chemical Society.
C. A newspaper editorial written by a United States senator.
D. A blog post by a university engineering student.

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%?