Estimate the number of times an average person's heart beats in a lifetime. Assume the average heart rate is and a life span of 75 years.
A) 3 109 beats
B) 3 108 beats
C) 3 1010 beats
D) 3 107 beats
Question 2
The electron-volt is a unit of
A) charge.
B) electric potential.
C) electric field.
D) electric force.
E) energy.