Effect of trailing zeros:In mathematics, trailing zeros are a sequence of 0 in the decimal representation of a number, after which no other digits follow. Trailing zeros to the right of a decimal point, as in 12.3400, does not affect the value of a number and may be omitted if ... Read More

Yes, a vibrating body produces sound when it is not in contact with any other body. For example, a string in a guitar produces sound when it is moved and has no contact with another body.   

In order to determine the molecular formula the following steps must be followed:1. Use the periodic table to determine the atomic mass of each element in the molecule.2. Multiply each element's atomic mass by the number of atoms of that element in the molecule. 3. This number is represented by ... Read More

Given: Rate of interest is 20%.To find: Here we have to find number of years taken by a sum of money to become more than double at the compound interest rate of 20% per annum.Solution:Let principal amount be = PHence, Amount (A) = 2PGiven rate of interest, R = 20% ... Read More

Given:The given expressions are (a) $1007 \times 1004$ and (b)  $121^{2}-31^{2}$.To do :We have to evaluate the given expressions using identities.Solution : (a) $1007 \times 1004$We know that, $(a+b) \times (c+d) = a \times (c+d) + b \times (c+d)$Therefore, $1007 \times 1004 = (1000+7) \times (1000+4)$            ... Read More

Scalene Triangle:A triangle in which all three sides are of different lengths is called a scalene triangle.The angles of a scalene triangle have different measures.

Given:$7 +7\times7-7\div7$.To do:We have to simplify the given expression.Solution:We have to use Bodmas rule in solving these types of problems.$7 +7\times7-7\div7=7 +7\times7-\frac{7}{7}$                                  $=7+7\times7-1$                                   $=7+49-1$                                   $=56-1$                                                                 $=55$.

A honeycomb is a mass of hexagonal wax cells built by honey bees in their nests to contain their larvae and stores of honey and pollen. Beekeepers may remove the entire honeycomb to harvest honey. 

Given :The ratio of the income to the expenditure of a family $= 7: 6$.Income $= Rs. 1400$To do :We have to find savings.Solution :Let the income of the family be 7x.This implies, Income $= Rs. 1400 = 7x$$7x = Rs. 1400$$x = Rs. \frac{1400}{7}$$x = Rs. 200$$Savings = Income ... Read More

It was initially started by Chinese people in 206 BC,  but it was completely developed by William Thomson a British scientist.