Problem 8.21 Part A When a mass m sits at rest on a spring, the spring is compre
ID: 1790052 • Letter: P
Question
Problem 8.21 Part A When a mass m sits at rest on a spring, the spring is compressed by a distance d from its undeformed length. Suppose instead that the mass is released from rest when it barely touches the undeformed spring. (Figure 1) Find the distance D that the spring is compressed before it is able to stop the mass. Express your answer in terms of some or all of the variables m and d. Submit My Answers Give Up Figure 1 Incorrect; Try Again; 12 attempts remaining At rest Part B At restUncompressed Does D- d? spring O yes no Submit My Answers Give Up CoExplanation / Answer
a) mg = kd
k = mg/d
conserving the energy we have
MgD = 0.5(K)*D^2
D = 2Mg/K
D = 2Mg / Mg / d
D = 2d
B) No