Physics
A spring is an example of which of these

Newton's 1st law
Conservation of mass law
Newton's 3rd law
Hooke's law

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Physics
Which of the following is not a property of heavy water ?

Boiling point of heavy water is lower than that or ordinary water
It produces corrosion
Freezing point of heavy water is higher than that of ordinary water
Density of heavy water is higher than that of ordinary water

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