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Radiation from the sun
1. The sun's radiation can be approximated by a black body. The surface temperature of the sun is about 5800 K and its radius is 0.7 × 109 m. The distance from the earth to the sun is 1.5 × 1011 m. The radius of the earth is 6.4 × 106 m. Estimate the average temperature of the earth from this information. Be careful to state your assumptions and approximations explicitly.
2. From the nature of your assumptions in the previous question (rather than your knowledge of the actual temperature), would you expect a more accurate calculation with this data to give a higher or lower answer? Explain your reasons clearly to obtain one bonus point per reason.
Consider the counterflow, concentric tube heat exchanger of Example 11.1. The designer wishes to consider the effect of the cooling water flow rate on the tube length. All other conditions, including the outlet oil temperature of 60°C, remain the ..
For the siphon in Fig. 6.26, assume that the volume flow rate is 5.6 X 10-3m3 /s. Determine the maximum allowable distance Y if the minimum allowable pressure in the system is -18 kPa (gage).
consider a gas turbine cycle with two stages of compression and two stages of expansion. the pressure ratio across each
the uniform disk of mass pivots freely on the cart of mass. determine the acceleration of the assembly and the angular
a thin walled cylindrical pressure vessel has an outer diameter of 7.50 in and wall thickness of 0.250 in with an
Water is boiled at sea level in a coffee maker equipped with an immersion-type electric heating element. The coffee maker contains 1 L of water when full. Once boiling starts, it is observed that half of the water in the coffee maker evaporates in 25..
the system is released from rest in the position shown. the masses of the collar a and the box b are ma 90 kg and mb
Assume E=31 ,000 MPa and ν=0.2 εa=-222x10-6 , εb=-213x10-6 , εc=45x10-6 Where gauges a, b and c are in line with, at 450 to and perpendicular to the centroidal axis of the column, respectively.
The exit temperature, in °R
The electronic components of a computer consume 0.1 kW of electrical power. To prevent overheating, cooling air is supplied by a 20-W fan mounted at the inlet of the electronics enclosure. At steady state, air enters the fan at20 °C, 1 bar and exits ..
A uniform circular disk of mass m = 1 kg and radius R = 0:4m rolls down an incline. Suppose the disk starts rolling from rest. Find the speed of the center-of-mass when the disk is 2m down the inclined plane.
Compute the electrical conductivity of a 7.0-mm (0.28-in.) diameter cylindrical sil- icon specimen 57 mm (2.25 in.) long in which a current of 0.25 A passes in an axial direction. A voltage of 24 V is measured across two probes that are ..
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