A 72.0 N package of whole wheat flour is suddenly placed on the pan of a scale s

Question

A 72.0 N package of whole wheat flour is suddenly placed on the pan of a scale such as you find in grocery stores. The pan is supported from below by a vertical spring of force constant 625 N/m. If the pan has negligible weight, find the maximum distance the spring will be compressed if no energy is dissipated by friction. A 0.45-kg stone dropped from a high of 3.50 m above a flat surface. When it hits the surface, the putty comes to rest in 0.250s. What is the average force exerted on the nutty by surface? 3. 4.

Explanation / Answer

3) F = 72.0 N

k = 625 N/m

PE of spring = 1/2 k x2

m g x = 1/2 k x2

x = 2 (m g) / k = 2 F / k

= 2 * 72 / 625

maximum distance = 0.230 m

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