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Elasticity 1.       A spring when pulled by a force of 20 N increased length of 6 m. What is the potential energy? A.     1,2 x 10 2 N/m B.      2,33 x 10 2 N/m C.      3,33 × 10 2  N/m D.     4,2 x 10 2 N/m E.      5,22 x 10 2 N/m 2.       A bar of steel which is 4 mm 2 in cross-sectional area and 4 cm in length is pulled by a force of 100 N. If the modulus of elasticity of steel is 2 x 10 11 N/m 2 , so the stress and strain of the steel is. . . A.     1,25 x 10 4 N/m 2 and 2,5 x 10 7 B.      1,25 x 10 -4 N/m 2 and 2,5 x 10 5 C.      2,5 x 10 5 N/m 2 and 1,25 x 10 4 D.     2,5 x 10 6 N/m 2 and 1,25 x 10 -4 E.      2,5 x 10 7 N/m 2 and 1,25 x 10 -4 3.       A cylinder made of steel...

Simple Harmonic Motion 1.       Two springs with constants respectively equal to 150 N/m arranged in parallel as shown in the following figure. What is the period of structure ( the mass of object m is 3 kg)? A.     0,2 π s B.      0,4 π s C.      2,0 π s D.     3,0 π s E.      4,0 π s 2.       An object is vibrating until form a harmonic motion with an equation   y = 0,04 sin 20π t. The deviation of y is in meters, t is time in second. What is the amplitude and frequency? A.     0,04 m and 5 Hz B.      0,04 m and 10 Hz C.      0,4 m and 10 Hz D.     0,5 m and 5 Hz E.      4 m and 5 Hz 3.       A mass of block is 0,5 kg, connected to a   light spring with constant 200 N/m. Then the system is os...