Sam and George are riding in separate cars on the freeway. The lanes they are driving in are adjacent. We choose our coordinate
system so that both are traveling into the positive x-direction. Sam travels at 65 mph and George travels at 72 mph. (a) What is Sam’s velocity relative to George? (b) What is George’s velocity relative to Sam?
cardiac muscle is striated. Uniquely, the cells of this kind of muscle are joined strongly together at adherens junctions that “enable the heart to contract forcefully without ripping the fibers apart.”
