Which of the following types of models is generally used to predict long-term events?
a.
idea model
b.
physical model
c.
computer model
d.
none of the above

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.