There is a +5.0-μc charge at three corners of a square having sides 70 mm long. what is the magnitude of the net electrostatic force on +6.0 μc placed at the center of the square? (k = 1/4πε0 = 9.0 × 109 n ∙ m2/c2)

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )

he made 11 calls in one day

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

not too sure thinking all accelerations are pointed down