Question

7.
The temperature of a substance decreases
at the rate of 2o C per 10 minutes
The temperature of the substance at
5 o'clock was io°C . At what time
will the temperature of the substance
be 4°C belove zero?​

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

The temperature of substance is 10 degree Celsius at 5 o' clock

The time needs to be calculated when the temperature of substance is -4 degree celsius (as it is mentioned that "4 degree Celsius below zero")

Therefore the drop in the temperature is 10 - (-4)

= 10 + 4

= 14 degrees

Let the total time required for this drop be x

For every 10 mins, there is a drop of 2 degree Celsius.

Therefore x/10 = 14/2

x = 14*10/2

x = 140/2

x = 70

So 70 minutes will be required for the substance to reach -4 degree Celsius.

70 minutes corresponds to 1 hour 10 minutes

Hence the time at which the substance would reach -4 degree Celsius is 5 o' clock +1hr 10 mins

= 6 hrs 10 mins