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Problem 1:
Heat is transferred steadily through a 0.2-m thick, 8m x 2 m wall at a rate of 2.6 kW. The inner and outer surface temperatures of the wall are 15 °C and 5 °C respectively. Find the average thermal conductivity of the wall.
Problem 2:
Consider a refrigerator that consumes 350 W of electric power when it is running. If the refrigerator runs only one quarter of the time and the unit cost of electricity is $0.19/kWh, find the electricity cost of the refrigerator over a 30 day month.
Problem 3:
The elevator of a large building is designed to raise a net mass of 4,000 kg at a constant speed of 12 m/s using an electric motor. Find the minimum power rating of the motor in kW.
in a steam power plant which utilizes rankine cycle steam enters the turbine at 100 bar and 400oc. it expands with an
a triangular gate abc with the shape of an isosceles triangle and the vertex at point a and the base bc 6 m what is
The joint of a space frame is subjected to four member forces. Member OA lies in the x-y plane and member OB lies in the y-z plane. Assume that F = 170lb. Determine the force F1 acting in OA member required for equilibrium of the joint.
Consider a heat exchanger with square tube of dimensions 0.05 m X 0.05 m inside a circular tube of diameter 0.10 meters. Oil at inlet temperature of 350 C and average velocity of 1 m/s flows inside the square tube and is cooled down to 200 C by water..
for the given chemical reaction calculate the net effect due to changing from the standard state at 298 k to 2 bar and
1.what is a beam? what factors determine the maximum load that it can take without failure?2.what is a column? what
A cantilevered beam with a rectangular cross section is loaded by a force perpendicular to the beam center line at the free end. The cross section is 100mm high and 25mm wide. The vertical load at the beam end is 40,000N.
an alluminum ball 0.5 cm in diameter initially at 250 c is dropped into a large tank of fluid with tsat100 c which is
underwater submersibles must match the local density in order to remain neutrally buoyant. maximum dive depths for
Using the graph paper provided, plot graph of voltage vs, current for the data in each table. Plot the entire graph on the same axes with voltage on the vertical axis and current on the horizontal axis. What is the similarity between these graphs? Wh..
question 1. which of the following would be used for the highest temperature measurements ?thermistorthermocoupleic
An object whose mass is 400 kg is located at an elevation of 25 m above the surface of the earth. For g= 9.78/s2, determine the gravitational potential energy of the object, in kJ, relative to the surface of the earth.
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