Suppose 2 kg of sugar contains `9 xx 10^6` crystals. How many sugar crystals are there in : 5 kg of sugar?

Suppose 2 kg of sugar contains 9 xx 10^6 crystals. How many sugar crystals are there in : 1.2 kg of sugar?

How are sugar crystals separated in a sugar factory ?

Suppose we have a large number of identical particles, very small in size. Any two of them at 10 cm separation repel with a force of 3 x 10^-10N. Suppose you measure the repulsion and find it 6xx10^-6N . How many particles were there in the group?

How many natural numbers lies between 9^2 and 10^2 ?

A current of 2.4 A flows through a wire of cross-sectional area 1.5 mm^2 . Find the current density in the wire. If the wire contains 8 xx 10^28m^-3 elecrtrons per unit volume calculate the average relaxation on time. Given that charge on electron = 1.6 xx 10^-19C and mass of electron =9.1 xx 10^-31 kg.

Find the cost of sugar and wheat per kg., if the cost of 7kg. Of sugar and 3 kg, of wheat is Rs. 210. cost of 7kg. wheat and 3 kg, of sugar is Rs. 160. (Use determinants).

Suppose the average mass of raindrops is 3.0 xx 10^-5 kg and their average terminal velocity 9 ms^-1 . Calculate hte energy transferred by rain to each square metre of the surface at a place which receives 100 cm of rain in a year.

Sugar crystals do not dissolve easily in ice cold water. Explain.