Question1
A small object with the mass of 380 mg carries a charge of 35.0 nC and is suspended by a thread between vertical plates of a parallel-plate capacitor. The plates are unconnected by 5.00 cm. If the thread makes an angle of 12.0° with vertical, what is potential difference between plates?
Question2
A crate of mass 59 kg is attached to one end of a string, and other end of the string runs over a pulley and is held by a person. If the person pulls with a force of 77 N, what is crate's acceleration? (Suppose that upward is the positive direction. point out the direction with the sign of answer.)