1.Calculate the heat energy required to melt a 20g block of silver at 200C. [The melting point of silver is 9600C, its specific heat capacity is and its heat of fusion is ]
1.Calculate the heat energy required to melt a 20g block of silver at 200C. [The melting point of silver is 9600C, its specific heat capacity is and its heat of fusion is ]
2.Determine the specific heat capacity of a metal substance if 135 kJ of heat is needed to raise 5.1 kg of the metal from 20°C to 30°C.
3.A glass louvre pane 0.4 cm thick has an area of . On a very cold day the temperature difference between the inside and outside surfaces of the pane is 250C. determine the rate of heat flow through this window. [ ]
4. The amount of heat energy required to raise the temperature of 20.0 kg of water from 150C to 95°C is …………………. [
5.Typical temperatures in the interior of the Earth and Sun are about 4000°C and 15 x 106°C, respectively. Determine the equivalent of these temperatures in Kelvin.
6.A 4 cm diameter and 6 cm long cylindrical rod at 1000 K emits a 385 kJ of radiation in 20 minutes. What is its emissivity? []……………………
7.A 1 kg block of copper at 200C is dropped into a large vessel of liquid nitrogen at 77 K. How many kilograms of nitrogen boil away by the time the copper reaches 77 K? [ ].
8. A 100 J of heat is added to a system that performs 60 J of work, the thermal energy change of the system is equal to ......................................
9. A 25.0 g silver spoon at 10.0 °C is placed in a cup of coffee at 45.0 °C. Determine the heat the spoon absorb from the coffee to reach a temperature of 52.0 °C. [………….
10. A tungsten sphere (e = 0.35) of radius 22 cm is at a temperature of 25°C.
If the sphere is enclosed in a room whose walls are kept at -5°C, calculate the net flow rate of energy out of the sphere
Determine the power radiated by the tungsten sphere. []
Trending now
This is a popular solution!
Step by step
Solved in 4 steps with 3 images
