ll T-Mobile 3:28 PM * 39%. a session.masteringphysics.com C Chapter 2-3 Problem

Question

ll T-Mobile 3:28 PM * 39%. a session.masteringphysics.com C Chapter 2-3 Problem 2.38 Constants Ball bearings can be made by letting sphericall drops of molten metal fall inside a tall tower - called a shot tower- and solidify as they fal Part A If a bearing needs 4.0 s to solidify enough for impact, how high must the tower be? Express your answer using two significant figures Request Answer Part B What is the bearing's impact velocity? Assume positive velocity i it is directed upward and negative velocity if it is directed downward Express your answer using two significant figures. Provide Feedback

Explanation / Answer

Using equation

H = U*t + 0.5*a*t^2

U = 0 = initial speed of ball bearing

t = 4 sec

a = -g = -9.81 m/sec

So,

H = 0*4 - 0.5*9.81*4^2

|H| = 78.5 m

Part B

V = U + a*t

V = 0 + (-9.81)*4

V = -39.24 m/sec = -39 m/sec

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