Give a reason : We can easily move our hand in air but to do the same in solid block of wood we need a Karate expert.

Give reason for the following observations : We can get the smell of perfume sitting several metres away.

Give reasons for the following observations. We can get the smell of perfume sitting several matres away.

An open metal bucket is in the shape of a frustum of a cone, mounted on a hollow cylindrical base made of the same metallic sheet (see Fig. 13.23). The diameters of die two circular ends of the bucket are 45 cm and 25 cm, the total vertical height of the bucket is 40 cm and that of the cylindrical base is 6 cm. Find the area of the metallic sheet used to make the bucket, where we do not take into account the handle of the bucket. Also, Find the volume of water the bucket can hold. (Take pi=22/7 ).