Physics
A system exhibiting S.H.M. must possess

Elasticity as well as inertia
Inertia only
Elasticity, inertia and an external force
Elasticity only

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Physics
A tank filled partially with a liquid is subjected to a uniform horizontal acceleration. Which of the following is true for the surface of liquid in the tank?

The liquid surface falls down only at the center of the tank
The liquid surface falls down on the direction of motion and rises up on the back side of the tank
The surface of the liquid remains horizontal
None

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