Question

An insulated cylinder fitted with a movable piston to maintain constant pressure initially contains 100 g of ice at -10 C. Heat is supplied to the contents at a constant rate by a 100 W heater. Make a graph showing temperature of the cylinder contents as a function of time starting at t = 0, when the temperature is -10 C and ending when the temperature is 110 C. ( c = 2.0 kJ/ kg K for specific heat of ice from -10 to 0 C and of the steam from 100 to 110 C)

Answer 1

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Y-axis: Temperature (^oC).

X-axis: Time (s)

At -10^oC:

We know that here time , t=0 s.

At 0^oC:

1. Heat energy required to rise the temperature is given by,

2. Heat required for the phase change (ice to water at 0^oC).

At 100^oC:

1. Heat energy required to rise the temperature is given by,

2. Heat required for the phase change (water to steam at 100^oC).

At 110^oC:

1. Heat energy required to rise the temperature is given by,

DATA WE GOT TO PLOT GRAPH:

TEMPERATURE (oC) (y-axis)	TIME (s) (x-axis)
-10	0
0	20, 354
100	774, 3034
110	3054

GRAPH: