Question

A certain freezing process requires that the temperature be lowered from 300 C at the rate of 30 C every hour. What will be temperature after 8 hours?- grade 7

Answer 1

Answer:

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

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Answer 2

Answer:

Let us assume that the lowered temperature as negative,

Let us assume that the lowered temperature as negative,Initial temperature = 40oC

Let us assume that the lowered temperature as negative,Initial temperature = 40oCChange in temperature per hour = -5oC

Let us assume that the lowered temperature as negative,Initial temperature = 40oCChange in temperature per hour = -5oCChange in temperature after 10 hours = (-5) × 10 = -50oC

Let us assume that the lowered temperature as negative,Initial temperature = 40oCChange in temperature per hour = -5oCChange in temperature after 10 hours = (-5) × 10 = -50oC∴The final room temperature after 10 hours of freezing process = 40oC + (-50oC)

Let us assume that the lowered temperature as negative,Initial temperature = 40oCChange in temperature per hour = -5oCChange in temperature after 10 hours = (-5) × 10 = -50oC∴The final room temperature after 10 hours of freezing process = 40oC + (-50oC)= -10oC

Let us assume that the lowered temperature as negative,Initial temperature = 40oCChange in temperature per hour = -5oCChange in temperature after 10 hours = (-5) × 10 = -50oC∴The final room temperature after 10 hours of freezing process = 40oC + (-50oC)= -10oCThe room temperature 10 hours after the process begins= -10oC