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Reconsider Prob. 9-21. Using EES (or other) software, plot the amount of heat loss through the glass as a function of the window glass thickness in the range of 0.1 cm to 1.0 cm. Discuss the results.
Problem 9-21
The inner and outer surfaces of a 0.5-cm thick 2-m 2-m window glass in winter are 10°C and 3°C, respectively. If the thermal conductivity of the glass is 0.78 W/m · K, determine the amount of heat loss through the glass over a period of 5 h. What would your answer be if the glass were 1 cm thick?
A fire helicopter carries a 680-kg bucket of water at the end of a 20.0-m long cable. Flying back from a fire at a constant speed of 40.0 m/s, Determine the force exerted by air resistance on the bucket
A rectangular block of wood (M = 219 kg) floats on a calm fresh water lake with do = 22.7 cm below the water. Find the mass of the dog
At the instant the traffic light turns green, a car that hasbeen waiting at an intersection starts ahead with a constantacceleration of 3.55 m/s^2. How fast is the car traveling when it overtakes the truck
A movable piston having a mass of8.00 kg and a cross-sectional area of 5.00 cm2 traps0.230 moles of an ideal gas in avertical cylinder. how much work is done on the gas
in a series rlc ac circuit the resistance is 33 ? the inductance is 31 mh and the capacitance is 19 microf. the
a glass windowpane in a home is 0.62 cm thick and has dimensions of 0.8 m 2.0 m. on a certain day the indoor
You are driving down a road and you crash into another car that is more massive. The cars do not stick together. Which undergoes the greater change of momentum? how about the change of velocity? how about the force?
a horizontal circular platform rotates counterclockwise about its axis at the rate of 0.805 rad/s. You, with a mass of 67.3 kg, Calculate the total angular momentum of the system
You are the technical consultant for an action-adventure film in which a stunt calls for the hero to drop off a 23.7-m tall building and land on the ground safely at a final vertical speed of 3.85 m/s. How many revolutions does the drum make during..
suppose that after walking across a carpeted floor you reach for a doorknob and just before you touch it a spark jumps
A spaceship with rest mass m0 is traveling with an x-velocity V0x=+4/5 in the frame of the earth. what is the energy of the photon torpedo in the frame of earth
A small sphere that carries a chargeq is whirled in a circle at the end of an insulatingstring. The angular frequency of rotationis ω. What average current does this rotatingcharge represent?
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