Two blocks, one with a mass of 4kg and the other with a mass of 12kg are hung fr

Question

Two blocks, one with a mass of 4kg and the other with a mass of 12kg are hung from opposite ends of a massless rope that passes over a massless, frictionless pulley, which is hung from the ceiling with a spring. The blocks are allowed to move freely, during which time the amount that the spring stretches from its equilibrium point is measured. If the experiment is repeated with two other blocks on the same apparatus, which of the following combination of blocks would make the spring stretch by the same amount? a. 6kg, 6kg b. 8kg, 8kg c. 9kg, 9kg 4kg 12kg d. 10kg, 6kg e. Two of these combinations of blocks will cause the same spring stretch as the original case. 8 Arollercoaster goes around a circular loop-de-loop, and barely makes it around. How does the coaster's kinetic energy at the top of the loop compare to its kinetic energy at the bottom? a. the KE's at both places are equal b. the KE is 2 times as large at the bottom as at the top c. the KE is 2.5 times as large at the bottom as at the top d. the KE is 4 times as large at the bottom as at the top e. the KE is 5 times as large at the bottom as at the top

Explanation / Answer

7)option e

8)option a

the kinetic energy at both the places are same because it is in circular motion.If it is from hilly then the kinetic energy at the bottom is high when compared at the top.

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