If 27 j of work are needed to stretch a spring from 15 cm to 21 cm and 45 j are needed to stretch it from 21 cm to 27 cm, what is the natural length of the spring?

9 cm.

Explanation:

The energy used for stretch the spring from to will be ,

The energy used for stretch the spring from to will be ,

using the energy of spring formula ,we find that

Dividing both the equation will get,

Therefore, the natural length of the spring is, 9 cm.

in simple terms, the principle states that the buoyancy force on an object is equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume times the gravitational acceleration, g. this is also known as upthrust.

in this image, you can see solar radiation going through ocean water.

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