How close to uranus would a spacecraft have to get to obtain the same resolution as in example 12.1 with a camera that has an angular resolution of 2 arcsec?

Dc versus ac problem. suppose your dc power supply is set to 15 v and the vertical setting on the oscilloscope is at 5 v/div. how many divisions will the trace deflect if you connect the output of the power supply to the scope with the a input switch set on dc? how many divisions if the switch is on ac?