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Q1. An engineer is building a structure made from concrete and copper. The structure includes concrete...

Q1. An engineer is building a structure made from concrete and copper. The structure includes
concrete posts with diameter 20.0 cm and copper rings with diameter 19.95 cm, as measured at
16 °C. What is the minimum temperature that the copper and concrete must be heated to in
order for the copper ring to slip over the concrete post?

Q2. An ice cube with temperature 0°C and weighing 20 g is dropped into 100 g of boiling water.
When the mixture comes into thermal equilibrium, what is its temperature?

Q3.
A hot liquid completely fills an insulated cube that is 50 cm long on each side. The insulating
material is 0.5 cm thick. The temperature of the liquid is 80 °C, and the temperature of the
surroundings is 10 °C. Find the rate of heat loss (in J/s) due to conduction if the thermal
conductivity of the insulating material is 8.4 10–4 J /s cm °C.



Science   Advanced-Physics   
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