Question

(a) Suppose that a person has an average heart rate of 72.0 beats/min. How many beats do they have in 2.0 years? (b) In 2.00 years? (c) In 2.000 years?

a) (a) 7.2 x 10^7 beats (b) 7.2 x 10^7 beats (c) 7.20 x 10^7 beats (d) 72000000 beats
b) (a) 7.2 x 10^7 beats (b) 7.2 x 10^7 beats (c) 7.20 x 10^7 beats (d) 72000000 beats
c) (a) 7.2 x 10^7 beats (b) 7.2 x 10^7 beats (c) 7.20 x 10^7 beats (d) 72000000 beats

Answer 1

Calculating the number of heartbeats in 2.0 years at a rate of 72.0 beats per minute involves converting years to minutes and multiplying by the heart rate. The correct number of heartbeats for 2.0 years is 75,686,400, which does not match any of the given answer options, indicating a possible error in the question.

Step-by-step explanation:

The task involves calculating the total number of heartbeats in a given period based on an average heart rate. To find the number of heartbeats in 2.0 years, we first convert the time into minutes and then multiply by the average heart rate. There are 525,600 minutes in a year, so for 2.0 years it is 1,051,200 minutes (525,600 minutes/year × 2 years). At a rate of 72.0 beats per minute, the calculation is:

72.0 beats/min × 1,051,200 min = 75,686,400 beats

However, the given possible answers do not match this correct result. If the student is required to choose from the given options, it might suggest a typographical error in the question or answer choices. Precision in the time period (2.0 years vs. 2.00 years vs. 2.000 years) does not affect the total number of beats since years are not typically measured beyond hundredths.