Final answer:
Motor RPM stands for the number of revolutions a motor makes in one minute, crucial for understanding angular motion in physics.
Step-by-step explanation:
Motor RPM refers to motor revolutions in one minute. Therefore, the correct answer is b. Revolutions. RPM stands for revolutions per minute. When discussing RPM in relation to angular velocity, converting RPM to radians per second is necessary. This provides the angular velocity (ω). With the radius (r) provided, one can calculate the centripetal acceleration using the equation ac = rω2. Moreover, when considering rotational motion, one revolution is equal to 2π radians, and this is key to understanding various aspects of angular motion.