Thermal enemy, but in most cases coal is used for electricity. The steel industry uses coal (or coke rather) in blast furnaces. Thermal energy is the part of the total internal energy of a thermodynamic system or sample of matter that results in the system temperature. This quantity may be difficult to determine or even meaningless unless the system has attained its temperature only through heating, and not been subjected to work input or output, or any other energy-changing processes.
The volume of a cube is reduced to 72.9%. By how much is the side of the cube reduced?
In an examination the percentage of students qualified with respect to the number of students appeared from school A is 75%. The number of students appe...
A and B have monthly incomes in the ratio of 6:5, respectively. Both save the same amount each month. A's monthly expenses are five times B's monthly sa...
Alloy A contains copper and zinc in the ratio 4:5 and alloy B contains copper and zinc in the ratio 7:2. A and B are taken in the ratio 7:4 and melted t...
The population of a city is decreased by 12% in the first year and then increased by 22% in the second year. Find the population of the city at the end...
In an election between two candidates, winner got 55% of total valid votes. If total number of votes cast were 2000 out of which 6% were invalid, then f...
A girl spent 40% of her monthly income on clothing. Of the remaining, she spent on travel and food in the ratio of 7:5. If the difference of the income ...
Meenu spent 30% of the salary on entertainment and 10% on makeup. She spent 10% of the remaining on the food and 50% of the remaining invested in mutual...
A gave 60% of amount to B. B gave 20% of amount received from A to C. If amount received by C from B is Rs.192, then find the amount received by B from A.
In an election two candidates participated. 10% voters did not vote. 11(1/9)% votes declared invalid and the winner got 75% of the valid votes. If he wo...
