Question

5. A certain freezing process requires that 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?​

Answer 1

Step-by-step explanation:

Given that

Let us assume that the lowered temperature as negative,

Initial temperature = 40°C

Change in temperature per hour = -5°C

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

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

= -10°C

The room temperature 10 hours after the process begins= -10°C

Answer 2

temp. at the moment=40°C

temp after 10 hours=40-(10×5) °C

=(40-50) °C

= -10°C