Question 2(i)
(a) A body of mass 5.5 kg is dropped from the 2nd floor of a building which is at a height of 15 m. What is the force acting on it during its fall? (g = 10 ms-2)
(b) What are isobars ?
(c) How many pulleys are there in a movable block and tackle system with velocity ratio 5 ?
(a) Given,
mass (m) = 5.5 kg
height (h) = 15 m
force acting on it during its fall = ?
Force acting on the body during its fall = weight of the body.
And F = mg
Substituting we get,
F = 5.5 x 10 = 55 N
Hence, Force acting on the body during its fall = 55 N
(b) The atoms of different elements which have the same mass number A but different atomic number Z are called isobars.
Example — and are isobars.
(c) The number of pulleys required in the movable block of a block and a tackle system with velocity ratio 5 will be 5.