Question

A Certain freezing process requires that room temp. be lowered from 24 degree c. at the rate of 3 degree c . every hour . What will be the room temp 5 hours after the process begins

Answer 1

Given that

Let us assume that the lowered temperature as negative,

Initial temperature = 40oC

Change in temperature per hour = -5oC

Change in temperature after 10 hours = (-5) × 10 = -50oC

∴The final room temperature after 10 hours of freezing process = 40oC + (-50oC)

= -10oC

The room temperature 10 hours after the process begins= -10oC

Answer 2

The present room temperature = 40\degree C

The room temperature decreasing every hour by rate of = 5\degree C

The room temperature after 10 hours will be

= 40\degree C\ +\ 10\times\left(-5\degree C\right)

= 40\degree C-50\degree C\

= -10\degree C

so, the room temperature after 10 hour = -10\degree C