I just need help with 1b and number 3 (the highlighted ones). Please and ty!! I can help you with algebra!

A1-lb collar is attached to a spring and slides without friction along a circular rod in a vertical plane. the spring has an undeformed length of 5 in. and a constant k =25 lb/ft. knowing that the collar is released from being held at a determine, the speed of the collar and the normal force between the collar and the rod as the collar passes through b.

What are the similarities & differences between a thermistor and a light dependent resistor in physics?

Frequency of electromagnetic waves that a radio station is assigned is called