Question

give reasons for the following we can easily move your hand in air but to do the same thing through a solid block of wood, we need a karate expert.

Answer 1

in air there is lot of empty space b/w the molecules and the force of attraction b/w the gas particles are least. hence,we can move our hands in air because in solids there are strong force of attraction b/w particles hence,we do not move hands easily in soilds moreover, there is no empty space b/w them

Answer 2

see the attachment for answer