Question

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

Answer 1

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

Given:-

• Room temperature lowered from 40°C .

• Temperature lowered at ever hour=5 °C.

To Find:-

• Temperature of room after 10 hours at given process begins.

Solution :-

☛In every 1 hour , the temperature decrease 5°C.

➭ 5 ×10= 50 °C.

Given temperature 40°c

∴ 40-50=-10 °c.

∴ The temperature of room after

10 hour this process begins is -10 °C