Explain the following : 1.telephone wires sag in summer
2.iron rims are heated before they are fixed on wooden wheels
3. The are left between the successive rails on a railway track
4. A cement floor is laid in small pieces with gaps in between
5. A glass stopper stuck in the neck of a bottle can be removed by pouring hot water on the neck of the bottle
Shalini has 1.5L of soda in a bottle. How many glasses can be filled, each of which has a capacity of 50 ml? How many glasses of capacity 60ml each be filled? [3 MARKS]
Explain the following:
(a) The telephone wires break in winter.
(b) Iron rims are heated before they are fixed on the wooden wheels.
(c) The gaps are left between the successive rails on a railway track.
(d) A glass stopper stuck in the neck of a bottle can be removed by pouring hot water on the neck of the bottle.
(e) A cement floor is laid in small pieces with gaps in between.
A small paper ball is kept in the neck of a glass bottle held horizontally. Explain, why, it is difficult to force the paper ball into the bottle by blowing air into the bottle