10_P16InstructorSolution

10_P16InstructorSolution - 10.16. Model: Assume an ideal...

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10.16. Model: Assume an ideal spring that obeys Hooke’s law. Visualize: Solve: (a) The spring force on the 2.0 kg mass is sp . Fk y =−Δ Notice that y Δ is negative, so sp F is positive. This force is equal to mg , because the 2.0 kg mass is at rest. We have . ky m g −Δ= Solving for k : 2 ( / ) (2.0 kg)(9.8 m/s )/( 0.15 m ( 0.10 m)) 392 N/m km g y =− Δ =− − − = The spring constant is 2 3.9 10 N/m. × (b) Again using : g −Δ =
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