Atoy uses a spring to shoot an arrow with a suction cup on
the end. the toy shoots a 34.2 g arrow and gives it a speed of
5.50 m/s. if the efficiency of the toy is 69.0%, how much elastic
potential energy was stored in the spring? show all your work.

8. why do radio telescopes convert radio waves (analog signals) to electrical (digital) signals for analysis? (hint: what did the article say about the advantages of digital signals? )

The field between two charged parallel plates is kept constant. if the two plates are brought closer together, the potential difference between the two plates either a) decrease b) does not change c) increase?

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?