Question

Plz tell answer of question no 21 plz don' answer unnecessarily after all i will mark as branlist answer who will tell correct answer ​

Answer 1

Given:

The boiling point of water is 100°C.

The initial temperature of water in a kettle is 36°C.

The temperature of the kettle increases by 4°C per minute.

Find:

1. Temperature of water in the kettle at the end of 10 minutes.

2. Time taken for water in the kettle to boil, i.e. to reach 100°C.

Solution:

1.

In 1 minute, temperature rises by 4°C.

So in 10 minutes, the temperature will ride by 4*10 = 40°C.

Also the initial temperature is 36°C.

So, the final temperature of water in the kettle after 10 minutes will be (36+40)°C = 76°C.

2.

For the water to boil, the temperature should reach 100°C from the initial value of 36°C.

So, the rise in temperature should be (100-36)°C = 64°C.

For increasing the temperature by 64°C, the time taken will be 64°C/4°C = 16 minutes.

Answers:

1. 76°C.

2. 16 minutes.

Answer 2

Answer:

(a) 76°C

(b) 16 minutes

Step-by-step explanation:

(a) In 1 minute, temperature rises by 4°C.

So in 10 minutes, the temperature will ride by 4 × 10 = 40°C.

Now, the initial temperature is 36°C,

Then, the final temperature of water in the kettle after 10 minutes will be,

→ (36+40)°C

→ 76°C.

(b) For the water to boil, the temperature should reach 100°C from the initial value of 36°C.

Now, the rise in temperature should be (100-36)°C = 64°C.

Then, for increasing the temperature by 64°C.

So, the time taken will be,

→ 64°C/4°C

→ 16 minutes.