11. 0/1 points Previous Answers Holphys06 9 P 040 My Notes Ask Your Teacher A ja

Question

11. 0/1 points Previous Answers Holphys06 9 P 040 My Notes Ask Your Teacher A jar of tea is placed in sunlight until it reaches an equilibrium temperature of 32°C. In an attempt to cool the liquid, which has a mass of 184 g, 126 g of ice at 0°C is added. At the time at which the temperature of the tea (and melted ice) is 17°C, determine the mass of the remaining ice in the jar. Assume the specific heat capacity of the tea to be that of pure liquid water. 155 x g 12. --1 points HolPhysO69P036. My Notes Ask Your Te A hot-water heater is operated by solar power. If the solar collector has an area of 4.1 m2 and the power delivered by sunlight is 550 W/m2, how long will it take to increase the temperature of 1.0 m3 of water from 24°C to 56°C?

Explanation / Answer

11) heat rejected to cool the tea from 32 to 17 degrees is given by

Q =mc(T1-T2)

this is absorbed by melting ice

heat absorbed = Mi L

MiL=mc(T1-T2)

Mi = mc(T1-T2)/L

c = 1cal/g degees c

L = 80 cal /g

m = 184g

T1 = 32

T2 = 17

plugging in we get mass of ice melted

Mi = 34.5 g

mass of ice remaining = 126-34.5 = 91.5g

12) heat required by water

Q = Mc(T2-T1)

Q =Pt

t = Mc(T2-T1)/P

M = 1000 kg

c = 4186 J/Kg C

2= 56

T1 =24

P = 550x 4.1 =2255 J/s

plugging in we get

t =59402.2 s

t = 990 mins

t =16.5 hours

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