Question

A 2-kg sample of a metal increases in temperature by 20°C when heated on a stove for 3 minutes. Can you predict what will happens to the temperature rise of a 4-kg sample of the same material when heat on the same stove for 6 minutes. A) The temperature change will be approximately 5°C.


B) The temperature change will be approximately 80°C
Eliminate

C) The temperature change will be approximately 20°C.


D) The temperature change will be approximately 40°C.

Answer 1

Answer: C) The temperature change will be approximately 20°C.

Explanation:

$Q= m\times c\times \Delta T$

Q= heat gained

m= mass of the substance = 2 kg

c = heat capacity = c J/g ° C      

$\Delta T={\text{Change in temperature}}=20^0C$  

$Q=2g\times cJ/g^oC\times20^oC$

Q=40c Joules

That is in 3 minutes,  heat absorbed = 40 c joules

in 6 minutes, heat absorbed=$\frac{40c}{3}\times 6=80c$

Now as the substance is same, the heat capacity will be same.

$80c= 4\times c\times \Delta T$

$\Delta T=\frac{80c}{4c}=20^0C$

Answer 2

Answer:

C The temperature change will be approximately 20°C.

Explanation:

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