Molecular Physics | Thermodynamics Answers

how much heat must be absorbed by 475 grams of water to raise its temperature by 30°c

If bock 1 weighs 50 kg, while block 2 weighs 90 kg , determine the external force p2 so that block 2 will maintain its position. Let p1 be equal to 5kN.Assume 0.3 coefficient of statics friction

What is the potential energy of 0.75 kg box which is lifted from the ground to a height of 0.5 m m above a meter high table? Use grams = 10 m/s

Driver of a 1125 kg dump truck exerts a sudden break with a force 2,500 N. Calculate the magnitude of calculate the acceleration of the truck uppon sudden brake

Write down energy flow equation for non flow process. Estimate heat flow to/from the system.

Specific internal energy is 420kJ/kg at the beginning of the expansion and specific internal energy is

200kJ/kg at the end of the process. The work done by the system is 100kJ/kg during the process.

where did you get the inner diameter?

A bus starts from rest at a station and accelerates at a speed rate of 2m/s^2 for 15 seconds. It then runs at a constant speed for 25 seconds and slows down at -3m/s^2 until it stops. Find the total distance travelled by the bus.

An exterior wall of a house may be approximated by a 0.1 m layer of

common brick (k = 0.7 W/m°C) followed by a 0.04 m layer of gypsum plaster (k = 0.48 W/m°C).

What thickness of loosely packed rock wool insulation (k = 0.065 W/m°C) should be added to

reduce the heat loss or (gain) through the wall by 80 per cent ?

(AMIE Summer, 1997)

A reactor’s wall 320 mm thick, is made up of an inner layer of fire brick

(k = 0.84 W/m°C) covered with a layer of insulation (k = 0.16 W/m°C). The reactor operates at a

temperature of 1325°C and the ambient temperature is 25°C.

(i) Determine the thickness of fire brick and insulation which gives minimum heat loss.

(ii) Calculate the heat loss presuming that the insulating material has a maximum tem￾perature of 1200°C.

If the calculated heat loss is not acceptable, then state whether addition of another layer of

insulation would provide a satisfactory solution

In a piston-cylinder arrangement, air with a volume of 0.1 m3 and a pressure of 100 kPa is compressed until pv2 = sbt until its pressure reaches 900 kPa. Find the volume of air in the final state and the work done during the process.