Work done by a force is maximum when the angle between force and displacement is
A. 60°
B. 0°
C. 30°
D. 90°
Answer: Option B
Solution (By JKSSB Mock Tests)
Work W = F·d = Fd cosθ. cos0° = 1 gives maximum work. At 90°, cos90° = 0, work zero. For given magnitudes, maximum when force parallel to displacement. This is basic definition.
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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