The grouping of materials which have similar properties is called sorting. The sorting of objects helps in their systematic study. The grouping can be done based on similarities or differences.

Distance is the length between two points. It is always a positive quantity. It is the total length traveled. For example, in the following figure if a person traveled from A to C through B then the total distance traveled by the person is 3 + 4 = 7 units ... Read More

Given: $(a^{2} - b^{2})$Solution It is an identity $a^{2} - b^{2} = (a+b) (a-b)$ $ (a+b) (a-b) = a^{2} - b^{2}$  Proof$(a+b) (a-b) = a^{2} - b^{2} + ab - ab = a^{2} - b^{2}$  So $a^{2} - b^{2} = (a+b) (a-b)$

To do: Find C.P of bicycle.Solution:Let C.P. of the bicycle = Rs.$100$In the 1st case :When Profit = $5% $; S.P. = Rs. $(100 + 5)$ = Rs. $105$ In the 2nd case: C.P. = $100 – \frac{30}{100} \times 100$         = Rs. $100 – 30 = ... Read More

a) If a ball of mass 5 kg is moving with an acceleration of $10m/s^2$  then the force with which the ball moving is 50N. What if another ball with the same properties (same force) collides with the first ball in the opposite direction?. Definitely, they will stop moving. When ... Read More

Given: Speed Of The Car Is 27km/45min.  To do: We have to convert 27km/45min to metre per second Solution:1km =  1000m 1 min = 60 seconds Speed Of The Car = $\frac{27 \times 1000 metre}{45 \times 60 second}$ = 10 m / s

The Periodic Table provides the names, atomic numbers, symbols and atomic weights of known elements. It serves as a great tool for solving chemistry problems.A periodic table is divided into groups (columns), where elements with each group behave similarly while bonding with other elements; and periods (rows), where elements in ... Read More

SI units are internationally accepted units. It stands for 'System International'. For example, you can measure mass in grams, kilograms, tons, etc. But the SI unit of mass is kg. Similarly, the temperature can be measured in Celsius, Fahrenheit, Kelvin, etc. But its SI unit is Kelvin. The SI units ... Read More

The sinoatrial node (also known as the SA node or the sinus node) is a group of cells located in the atrial wall at the junction of superior caval vein and wall of the right atrium of the heart that works as the pacemaker of the heart. These cells have ... Read More

Loga a = 1Log of any number or quantity to the same base or quantity is always 1.From the definition of a logarithm, Loga b = x means ax = bSo Loga a  implies ax = a  or x = 1. So Loga a = 1