A thick black-painted wood block at 20 c is subjected to

Assignment Help Mechanical Engineering
Reference no: EM13625480

A thick black-painted wood block at 20 C is subjected to constant solar flux of 1250 W/m2. If the absorptance of the block is 0.92 what is the temperature of the exposed surface after a time of 20 minutes? What is the temperature if the block were made of aluminum?

Reference no: EM13625480

Questions Cloud

Assuming that the time interval includes the left limit and : when do creative people get good ideas? assume that the survery of 965 inventors give the following informationtime of
Jet-type pumps are sometimes used for special purposes such : jet-type pumps are sometimes used for special purposes such as to circulate the flow in basins in which fish are being
Determine a the total rate of change in exergy of the steam : steam enters an adiabatic turbine at 6 mpa 600oc and 80 ms and leaves at 50 kpa 100oc and 140 ms. if the power output
A water tank has an inflow line 1 ft diameter and two : a water tank has an inflow line 1 ft diameter and two outflow lines of 0.5 ft diameter. the velocity in the inflow line
A thick black-painted wood block at 20 c is subjected to : a thick black-painted wood block at 20 c is subjected to constant solar flux of 1250 wm2. if the absorptance of the
Suppose you are conducting a study with a total of 50 : suppose you are conducting a study with a total of 50 participants from five different regions of the country and you
The r-134a undergoes a process that increases its volume by : a spring-loaded piston-and-cylinder device is initially filled with 0.2 lbm of a vapor-liquid mixture of r-134a at -30f
If the temperature is increased to 340degc and the : a coil of nichrome wire is 27.0 m long. the wire has a diameter of 0.390 mm and is at 20.0degc.a if it carries a
A carnot heat pump is to be used to heat a house and : a carnot heat pump is to be used to heat a house and maintain it at 25c in the winter. on a day when the average

Reviews

Write a Review

Mechanical Engineering Questions & Answers

  Use potential flow theory to determine the lift coefficient

Use potential flow theory to determine the lift coefficient of a spinning baseball in terms of the forward velocity (V ) and spin RPM.

  If the compressor consumes 450 w of power determine a the

a refrigerator uses 134a as the working fluid and operates on the ideal vapor-compression refrigeration cycle. the

  An ideal vapor-compression refrigeration system operates

An ideal vapor-compression refrigeration system operates at steady state with Refrigerant 134a as the working fluid. Superheated vapor enters the compressor at 30 lbf/in2, 20F, and saturated liquid leaves the condenser at 140 lbf/in2. The refriger..

  At the position of the negative charge what is the

three equal charges of magnitude q6.00 uc are located at three corners of a square edge length d2.9 cm. a negative

  Find the final mass of air

A balloon behaves so the pressure is P = C2V1/3, C2 = 100 kPa/m. The balloon is blown up with air from a starting volume of 1 m3 to a volume of 3 m3. Find the final mass of air assuming it is at 25oC and the work done by the air.

  A flywheel can be considered as being composed of a thin

a flywheel can be considered as being composed of a thin disc and a rim. the rim weighs 322 lb and has diameters of 24

  Determine the a amount of paddle-wheel work in btu after 45

an insulated rigid tank initially contains 1.8 ibm of helium at 82 f and 45 psia. a paddle wheel with a power rating of

  Kic for the aluminum alloy used in making a structure is

kic for the aluminum alloy used in making a structure is 45mpam0.5. if the structure contains a crack 2.5mm long what

  The light is a 12 w bulb how much energy if any will be

a useful figure of merit comparison between batteries that have the same voltage is the ampere-hour ah rating. for

  A double effect evaporator is to be employed in

a double effect evaporator is to be employed in concentrating 15 solution of naoh at 700f to 40. the condensing

  A humidity ratio of 0021 kgkg dry air to 15degc and a

air is cooled and dehumidified as it flows over the coils of a refrigeration system at 1atm from 25degc and a humidity

  Calculate the actual power transmitted to the second pulley

Calculate the actual power transmitted to the second pulley and calculate the power which can be transmitted if the maximum tension in the belt is limited to half of the ultimate strength of the belt.

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd