Find R3 and V0 from the circuit

Tall pacific coast redwood trees can reach heights of about 100 m. if air drag is negligibly small, how fast is a sequola cone moving when it reaches the ground f it dropped from the top of a 100 m tree?

Where is the potential energy throughout the loading, cocking, and releasing of the trebuchet?

If the new moon happens on january 15th, what shape will it be on february 6th?