5. 0/1 points | Previous Answers SerPSE9 12. P035 A 2.10-m-long cylindrical stee

Question

5. 0/1 points | Previous Answers SerPSE9 12. P035 A 2.10-m-long cylindrical steel wire with a cross-sectional diameter object of mass m 5.65 kg is hung from one end of the wire and an object of mass m2- 3.30 kg from the other en shown in the figure below. The objects are released and allowed to move freely. Compared with its length before the were attached, by how much has the wire stretched while the objects are in motion? My Notes O Ask You of 4.00 mm is placed over a light, frictionless pulle Your response differs significantly from the correct answer. Rework your solution from the beginning and check each s carefully. mm Need Help? Read It 3-11 points SerPSE9 12.P.036 My Notes Ask You Review Problem. A 28.0 kg hammer strikes a steel spike 2.60 cm in diameter while moving with speed of 25.0 m/s.

Explanation / Answer

on m1: 5.65g - T = 5.65 a .... (i)

on m2: T - 3.30g = 3.30 a .... (ii)

(i)+(ii) =. 5.65g - 3.30g = (5.65 + 3.30) a

a = (2.35 x 9.8) /(8.95) = 2.57 m/s^2

T = 3.30 (a + g) = 40.9 N  

Stress = Y ( strain)

T / A = Y ( deltaL / L )

(40.9) / (pi (2 x 10^-3)^2) = (20 x 10^10) (deltaL / 2.10)

deltaL = 3.41x 10^-5 m

= 0.034 mm ......Ans

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