The device for measuring the electric potentials of the brain is called an
a. ECG
c. EKG
b. EBG
d. EEG
Question 2
A ventilation fan has blades 0.25 m in radius rotating at 30 rpm. What is the tangential speed of each blade tip?
a. 0.02 m/s
c. 0.79 m/s
b. 0.52 m/s
d. 20 m/s