Final answer:
To find the time per heartbeat at a rate of 150 beats per minute, divide 60 seconds by 150, resulting in 0.4 seconds per beat, which corresponds to option b) 0.40 s.
Step-by-step explanation:
If your heart rate is 150 beats per minute during strenuous exercise, we need to calculate the time per beat in units of seconds. To do this, we know that there are 60 seconds in one minute. So, we need to divide the total seconds in a minute by the number of heartbeats per minute to find the time per beat.
To find the time per beat in units of seconds, we need to convert the heart rate from beats per minute to beats per second. Since there are 60 seconds in a minute, we can divide the heart rate by 60 to get the rate in beats per second. Therefore, 150 beats per minute is equal to 150/60 = 2.5 beats per second.
So, the time per beat in units of seconds is 1 / 2.5 = 0.40 seconds per beat.
Therefore, the correct answer is (b) 0.40 s.
The calculation is as follows:
60 seconds ÷ 150 beats per minute = 0.4 seconds per beat
Therefore, the time per beat is 0.4 seconds, which corresponds to option b) 0.40 s.