Question

At constant pressure certain quantity of water at 24° is heated. It was observed that

the rise of temperature was found to be 4° per minute. Calculate the time required

to rise the temperature of water to 100° at sea level by using formula
Arithmetic progression.. chapter ​

Answer 1

Series= 24, 28 , 32, 36, ....100

In this series

• a=24
• d= 4 ,
• Sn=100

We have to find the value of n,

The formula to find term is

$\tt \: s_n=a+(n-1)d \\ \tt \: 100=24+(n-1)4 \\ \tt \: 76=(n-1)4 \\ \tt\: \frac{76}{4}=(n-1)\\ \tt\: 19=(n-1)\\ \tt\: n=20$

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