Explanation:
Albert Einstein proposed special relativity (1905) and general relativity (1915), revolutionized concepts of space, time, gravity. E=mc². Newton classical mechanics. Galileo telescope, falling bodies. Watt steam engine.
Explanation:
1 kWh = 1000 W × 3600 s = 3,600,000 J = 3.6 × 10⁶ J. This is a standard conversion. Power (watt) × time (hour) gives energy. 1 watt = 1 J/s. Remember this for electricity bills.
Explanation:
Lactometer is a type of hydrometer used to check purity of milk by measuring specific gravity. Adulteration with water lowers density. It doesn't measure temperature or viscosity directly.
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