An aluminium container of mass 100 gm contains 200gm of ice at -20c heat is added to system at rate of 100 cal/s find temp of system after 4minutes

1) First calculate the total heat added to the system:

time 4 min * 60 s / min= 240 s

Heat = rate * time = 100 cal/s * 240 s = 24,000 cal

2) Calculate the change due to each element of the systemr:

2.1 Aluminun container, Q Al = mass * Specific heat * ΔT =

mass = 100 g

Specific heat (from a table) = 0.22 cal / (g °C)

ΔT = T - (-20°C)

Q Al = 100 g * 0.22 cal /(g°C) * (T + 20) = 22(T + 20)

2.2 Q ice from -20 °C to 0°C

mass = 200 g
Specific heat = 0.49 cal / (g°C)
ΔT = (0°C - (-20°C)) = 20°C

2.3 Q ice =200g * 0.49 cal / (g°C) * 20°C = 1,960 cal

2.4 Latent fussion heat of ice

From a table: 80 cal / g

Q Lf = 200 g * 80 cal/(g) = 16,000 cal

3)  Heating of the water from 0°C to final T

Specific heat = 1 cal / (g°C)

Q w = 200g * 1 cal / (g°C) * (T - 0) = 200T

5) Final calculus

24,000 cal = Q Al + Q ice + Q Lf + Qw =

= 22(T + 20) + 1960 cal + 16,000 cal + 200T = 22T + 440 + 1960 + 200T =

24,000 = 222T + 2400 => 222T = 24000 - 2400 = 21,600 =>

T = 21,600 / 222 = 97.3 °C

97.3 °C 

Iread this book last year so take this with a grain of salt.gene jumps from the tree to compete with finny due to the fact that gene is always trying to do better than finny. he is put under the grasp of peer pressure due to finny almost forcing him to do this. ever since he first jumped finny kept pressuring him to jump since he thought gene enjoyed jumping.rather than uses this answer you should probably just reread chapters 3-4