Define effeciency of a liver. What is meant by efficiency of a machine is 80% !

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles

i would say

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach