If a 500µf can store 0.02j of energy, what must the voltage supplied to the capacitor be

The energy stored on a capacitor can be expressed in terms of the work done by the battery. Voltage represents energy per unit charge, so the work to move a charge element dq from the negative plate to the positive plate is equal to V dq, where V is the voltage on the capacitor.

U =0.5CV^2

0.02 =0.5(500x10^-6) V^2

Solve for V

V = 8.94 volts 

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

answer: 31, 5556. 952 seconds