A 20ft x 20ft metal building has a steel roof that reaches a temperature of 140o...

A 20ft x 20ft metal building has a steel roof that reaches a temperature of 140^o F on a hot day. A cool front then moves in such that air at 60^oF sweeps horizontally across the roof at a velocity of 10 ft/s. Assuming the roof temperature remains at a constant 140^oF for a time, determine:

a) the point at which the flow becomes turbulent (in feet)

b) the average heat transfer coefficient for the roof (in BTU/hr*ft^2*F)

Expert Solution

samet mamat answered 2 years ago

Ant on a metal plate. The temperature at a point ( x, y) on a metal...

Ant on a metal plate. The temperature at a point ( x, y) on a metal plate is T(x, y) = 4x2 - 4xy + y2 . An ant on the plate walks around the circle of radius 10 centered at the origin. a) What are the highest and lowest temperatures encountered by the ant? b) Suppose the ant has changed its trajectory and is walking around the circle of radius 5. Is the highest temperature encountered by the ant...

. [4 pts] The temperature of a 4 foot metal rod at a point x feet...

. [4 pts] The temperature of a 4 foot metal rod at a point x feet from its left endpoint is given by T(x) = 1 + 3x 2 , 0 ≤ x ≤ 4, where T is measured in degrees Celsius (and x is measured in feet). Find the average temperature of the rod. 5. [6 pts] A particle moves along a coordinate line and has an acceleration given by a(t) = 4t+ 6 cm/sec2 . If the particle’s...

Assume that a building has a replacement cost of $250,000 but is insured for only $150,000. The roof on the house

Assume that a building has a replacement cost of $250,000 but is insured for only $150,000. The roof on the house is 10 years old and has a useful life of only 20 years. The roof is severely damaged by hail and needs to be replaced. The cost of the new roof is $20,000. Ignoring the deductible. What is the cash value?

A metal bar (23.5 x 10-6oC-1) has a final length of 5.5800 m after its temperature...

A metal bar (23.5 x 10-6oC-1) has a final length of 5.5800 m after its temperature changes from 64.459 oF to -27.674 oC. a) Convert the initial temperature to oC. 18.03 21.82 20.55 16.59 11.90 26.14 In 100 words or less, explain how to calibrate a new and otherwise unmarked mercury or alcohol filled, glass thermometer.

Imperial Building has height of 73 m. Three snipers on a nearby roof shut with three...

Imperial Building has height of 73 m. Three snipers on a nearby roof shut with three rifle when King Kong jumped down (free fall). 1. The sniper A shut with initial velocity 20 m/s and angle 30 degree, the horizontal distance from the sniper A to the base of imperial building is 40 m. The roof is 50 m tall. 2. The sniper B shut with initial velocity 10 m/s and angle 60 degree, the horizontal distance from the sniper...

Open-web steel joists are to be used for a roof with a live load of 30...

Open-web steel joists are to be used for a roof with a live load of 30 psf and a dead load of 18 psf (not including the joist weight) on a span of 44 ft. Joists are 5 ft on center, and deflection is limited to 1/360 of the span. Select the lightest joist.

A man stands on the roof of a building of height 15.7 m and throws a...

A man stands on the roof of a building of height 15.7 m and throws a rock with a velocity of magnitude 30.1 m/s at an angle of 25.0 ? above the horizontal. You can ignore air resistance. A) Calculate the maximum height above the roof reached by the rock B)Calculate the magnitude of the velocity of the rock just before it strikes the ground C) Calculate the horizontal distance from the base of the building to the point where...

A man stands on the roof of a building of height 14.2 m and throws a...

A man stands on the roof of a building of height 14.2 m and throws a rock with a velocity of magnitude 26.9 m/s at an angle of 25.6 ∘ above the horizontal. You can ignore air resistance. A.) Calculate the maximum height above the roof reached by the rock. B.) Calculate the magnitude of the velocity of the rock just before it strikes the ground. C.) Calculate the horizontal distance from the base of the building to the point...

You throw a ball off of the roof of a building with a velocity of 20...

You throw a ball off of the roof of a building with a velocity of 20 m/s directed an angle of 60 degrees above the horizontal. If the building is 30m tall, find the following a) Total air time? b) Total horizontal distance traveled? c) Maximum height reached? d) The speed at which the ball strikes the ground? e)The angle at which the ball strikes the ground?

A ball is thrown straight up from the edge of the roof of a building. A...

A ball is thrown straight up from the edge of the roof of a building. A second ball is dropped from the roof a time of 1.20 s later. You may ignore air resistance. A) If the height of the building is 20.7 m , what must the initial speed be of the first ball if both are to hit the ground at the same time? B) Consider the same situation, but now let the initial speed v0 of the...

Question