a person holds a 4.0 kg block at position a shown above on the left, in contact with an uncompressed vertical spring with a spring constant of 500 n/m. ther person gently lowers the block from rest at position a to rest at position b. which of the following describes the change in the energy of the block-spring-earth system as a result of the block being lowered?
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The force of each name is 1 kilogram, a fraction of a fraction on an equal block. In this state of Mukila, is the value index of the three blocks across the fourth block and the outpost contact block with the
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Decrease by ~1.5 J
Explanation:
Position A, the spring is uncompressed so it does not have potential spring energy in the moment, only potential gravitational energy or "mgh". mgh for position A = 11.76. Position B is compressed by 0.1 m from equilibrium (0.3m). So it has mgh+(1/2kx^2). mgh=7.84 and 1/2kx^2 = 250 x 0.1^2 = 2.5.
2.5 + 7.84 = 10.34
11.76 - 10.34 = 1.42 which is closest to 1.5 J (note it is lost energy because height decreases)
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