1.975kj of heat is added to a 167g block of aluminum with an anitial temperature of 23 degrees celsius. What is the final temperature after the heat has been added.

Question 4If a copper kettle has a base of thickness 2 mm and area 3 x 10^-2 m², estimate the steady difference in temperature between inner and outer surfaces of the base which must be maintained to enable enough heat to pass through so that the temperature of 1 kg of water rises at the rate of 0.25 K s^-1. Assume that there are no heat losses, the thermal conductivity of copper = 380 Wm^-1K^-1. and the specific heat capacity of water is 4200 Jkg^-1 K^-1.

For item 42: Table D2 Determination of Specific Heat of a Metal Initial mass of metal, mm (g) Initial temperature of metal, Tm,0 (°C) Initial mass of water, mw (g) Initial temperature ofwater, Tw,0 (°C) Final Temperature of mixture, T,(°C) Experimental Specific Heat cal of metal Cexp Actual Specific Heat of cal metal Cact g.Cº. Percentage Error Copper 30 42.) 110 43.) 125 20 21.94 0.9195 % For Item 42: choices for number 42 0.9180 0.9436 0.9513 0.8154 0.8354 For item 43: choices for number 43 0.17 O 0.16 0.15 0.18 0.19

Calculate the heat flow (H) into a refrigerator with a total outer surface area of 5.22m2, and given an outside temperature of 25°C and a fridge temperature of 8°C. The thickness of the walls of the fridge is 5.2 cm and they are insulated with polyurethane foam that has a thermal conductivity of 0.022 W/mk.           37.5W           55.3W           63.6W           77.2W