Answer:
(a) -37°C
(b) 1[tex]\frac{10}{11}[/tex]minutes≈1.91 minutes
Step-by-step explanation:
(a) The thermometer reading was 18°C in a room and this dropped to a reading of 7°C outdoor after 1 minute hence in 1 minute, temperature (heat) loss
= [tex]18-7[/tex]
=[tex]11[/tex]°C
After 4 more minutes, the thermometer would have lost additional 44 minutes (4×11). Hence thermometer reading after 4 more minutes would be
[tex]= 18 - 11 - 44
= -37°C
(b) The thermometer loses temperature at 11°C per minute. For the thermometer to read -3°C, the temperature loss must be
= 18-(-3)
= 21°C
At a temperature loss rate of 11°C, the thermometer would lose 21°C in
=[tex]\frac{21}{11}[/tex]
=1[tex]\frac{10}{11}[/tex] minutes
≈1.91 minutes
