A helical compression spring is wound using 2.5-mm-diameter music wire. The spring has an outside diameter of 31 mm with plain ground ends, and 14 total coils. Estimate the spring rate. What force is needed to compress this spring to closure

An object is dropped from a tower, 400 ft above the ground. the object's height above ground t seconds after the fall is s(t)equals400 minus 16 t squared. determine the velocity and acceleration of the object the moment it reaches the ground. the velocity of the object the moment it reaches the ground is nothing ft/s.

Which changes of state do the labels represent? a: b: c:

Which changes would result in a decrease in the gravitational force btween two objects? check all that apply