Final answer:
Using kinematic equations, the student is required to calculate the time of acceleration for blood being expelled by the left ventricle, ensuring the units are consistent, and then compare it with the duration of an average heartbeat to assess the reasonableness of the result.
Step-by-step explanation:
The student's question pertains to the acceleration of blood by the left ventricle of the heart and involves applying kinematic equations to determine the time over which the acceleration occurs. The knowns in this problem are the final velocity (30.0 cm/s), the initial velocity (0 cm/s, as it is starting from rest), and the distance over which the acceleration occurs (1.80 cm). To find the time of acceleration, we use the kinematic equation which relates velocity, acceleration, and distance:
v² = u² + 2as
Where v is the final velocity, u is the initial velocity, a is the acceleration, and s is the distance. We can solve for acceleration a first and then use it to find the time t using the equation v = u + at. After calculating, the time for the acceleration can be checked if it is reasonable by comparing it to an average heartbeat duration, which is typically less than a second for a healthy heart at rest.