Question
A circular plate, a cube and a sphere, all made up of
same material and having the same mass, are heated to 300°C and left in a room. Which of them will have the slowest rate of cooling?Solution
In the late of 17th century British scientist Isaac Newton studied cooling of bodies. Experiments showed that the cooling rate is approximately proportional to the difference of temperatures between the heated body and the environment.
The mean proportion of 324 and 225 is:
Three numbers are in ratio 2:3:5. If the sum of the squares of those three numbers is 342 then find the sum of the three numbers.
What is the fourth proportional to 4, 9, 16?
A bag contains certain number of coins of different denominations. The ratio of the number of Rs. 2 coins to Rs. 5 coins is 3 : 4, respectively and the...
The ratio of two numbers A and B is 9:19 and C is 60% of the average of the numbers A and B. If the sum of A, B and C is 182, then what is the value of A?
A bag contains Re 1 and 50 paise coins in the ratio 2 : 3. While the ratio of 50 paise and 25 paise is 4:5. If the total value of these coins is Rs 177....
Marks scored by A and B in a test are in the ratio 13:6 respectively. If B had scored 4 more marks, then marks scored by A would be 30% more than that o...
There are 70 rupees in a box which contains coins of 1 rupee, 50 paise, and 25 paise. If the number of 50 paise coins is 2 times the number of 25 paise ...
A sum of money is divided in the ratio of 5 : 12. If the smaller part is 380. Find the larger part.
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