Suppose you have two chains available to suspend an object in the air. Let’s also say that you can arrange the suspension howeve
r you like. Which arrangement would cause the least amount of tension on the chain or chains?
A. Image 3
B. Image 4
C. Image 2
D. Image 1
A. Image 3
B. Image 4
C. Image 2
D. Image 1
2 answers:
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Answer:
16.1 m/s
Explanation:
We can solve the problem by using the law of conservation of energy.
At the beginning, the spring is compressed by x = 35 cm = 0.35 m, and it stores an elastic potential energy given by
where k = 316 N/m is the spring constant. Once the block is released, the spring returns to its natural length and all its elastic potential energy is converted into kinetic energy of the block (which starts moving). This kinetic energy is equal to
where m = 0.15 kg is the mass of the block and v is its speed.
Since the energy must be conserved, we can equate the initial elastic energy of the spring to the final kinetic energy of the block, and from the equation we obtain we can find the speed of the block: