Question

A certain freezing process requires that the room temperature be lowered from 40oC at the rate of 5oC every hour. What will be the room temperature 10 hours after the process begins

Answer 1

Correct Question :

A certain freezing process requires that the room temperature be lowered from 40°C at the rate of 5°C every hour. What will be the room temperature 10 hours after the process begins.

Solution :

Given :

A certain freezing process requires that room temperature be lowered from 40°C to 5°C every hour.

To find :

The room temperature 10 hours after the process begins =?

Step-by-step explanation :

It is Given that :

Initial temperature = 40° C

Room temperature decreases at 5° C per hour.

So, Temperature changing in 1 hour = - 5° C

Then, Temperature change in 10 hours = - 5 × 10° C = - 50° C

•°• Room temperature after 10 hour = initial temperature + temperature change in 10 hour.

Substituting the values, we get,

= 40 + ( - 50 )

= 40 - 50

= - (-40 + 50)

= - (50 + 40)

= - 10.

Therefore, Room temperature after 10 hours = -10° C.

Answer 2

$\bf\large{\underline{\underline{Question:-}}}$

A certain freezing process requires that the room temperature be lowered from 40oC at the rate of 5oC every hour. What will be the room temperature 10 hours after the process begins.

$\bf\large{\underline{\underline{solution:-}}}$

Initial temperature = 40℃

Rate of change in temperature = 5/℃ per hour.

Time = 10 hours.

Temperature = 5×10℃ = 50℃

So,

Final temperature = 40℃-50℃

Final temperature is = -10℃