Question

ive reasons for the follwoing cases -
A moving car is said to be in translatory motion but a fan is not.
Density of almost all substances decrease on increasng temperature.
A boy of mass 50kg has same mass everywhere in universe but different
weight?
A girl running around a circular tract completed one round is said to have
zero displacement.​

Answer 1

Answer:

1: Because fan rotates on a fixed axil of rotation and also it doesn't move in a straight line.

2:As the temperature increases density decreases because it is a property of water.