19 Aluminum
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 Deluxe 19lbs Lightweight Compact Aluminum Transport Wheelchair Foldable New  US $99.99
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 Transport Chair Steel Wheelchair Aluminum Footrests 19 US $109.95
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 19 Drive Medical Aluminum Transport Chair only 19 lbs US $154.00
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 Roscoe KTA1916SA BL Aluminum Transport 19 Wheelchair US $123.51
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 Roscoe KTA1916SA BG Aluminum Transport 19 Wheelchair US $123.51
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 Drive 19 Aluminum Transport Chair Blue Frame US $129.95
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 Drive 19 Aluminum Transport Chair Black Frame US $121.59
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 17 Drive Medical ATC Aluminum Transport Chair19 lbs US $154.00
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 Invacare Lightweight Aluminum Transport Wheelchair Red 19 Seat US $174.99
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 Flyweight Lightweight Transport Wheelchair 19 Deluxe Aluminum Green US $192.55
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 Drive Medical Aluminum Transport Chair ATC 19 19W US $120.00
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 Drive Medical Aluminum Transport Chair ATC 19 19W US $129.00
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 Fly Lite Aluminum Transport Chair Drive Medical DFL19BLK US $264.84
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 Drive Medical 19 Aluminum Transport Wheelchair Red US $145.00
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 Aluminum Transport Chair Lightweight 19 Seat Belt US $138.61
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 TranSport 19 Aluminum Wheelchair BLUE 250lb Capacity Folding Chair BLUE US $209.95
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 Invacare Lightweight 19 Aluminum Transport WHEELCHAIR US $139.99
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 ALUMINUM TRANSPORT COMPANION WHEELCHAIR 19 new blue US $256.00
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 DRIVE FW19GR Deluxe Fly Weight Aluminum Lightweight Transport Wheelchair Plaid US $175.31
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 Drive EXPEDITION ALUMINUM TRANSPORT CHAIR W LOOP LOCK EXP19BL US $185.00
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 Drive Medical Deluxe Fly Weight Aluminum Transport Chair Model FW17 FW19 US $197.00
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 EJ782 1 Aluminum Transport Chair Lightweight 19 Wide Red US $130.64
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 Nova Ortho Med Inc 19 Lightweight Aluminum Transport Chair with Hand Brake US $149.99
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 Drive Medical ATC19BL 19 Inch Aluminum Transport Chair US $145.00
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 Drive Medical Lightweight Aluminum Transport Chair ATC19 RD US $110.00
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Heating Brass and Aluminum, coefficients, etc.. How do I solve this problem? Thanks!?
A brass ring of diameter 10.00 cm at 19.0°C is heated and slipped over an aluminum rod with a diameter of 10.01 cm at 19.0°C. Assuming the average coefficients of linear expansion are constant.
(a) To what temperature must this combination be cooled to separate the two metals?
______°C
Is this temperature attainable?
___no
___yes
(b) To what temperature must this combination be cooled to separate the two metals if the aluminium rod were 10.05 cm in diameter?
______°C
Aluminum23 E-6/K at 20 °C
Brass 19 E-6/K at 20 °C
L1A - L2A=L1A Ca (T1-T2)
L1B - L2A=L1B CB (T1-T2)
Subject to condition L2A=L2B=L
we have
L=L1A - L1A Ca (T1-T2)
L=L1B - L1B Cb (T1-T2)
Subtracting we have
0= (L1A - L1B) - (T1-T2) (L1A Ca - L1B Cb )
T1-T2= (L1A - L1B) / (L1A Ca - L1B Cb )
T2= T- (L1A - L1B) / (L1A Ca - L1B Cb )
T2= 19.0 - (10.00 - 10.01) / [(10.00 x 19 - 10.01 x 23) x 1E-6]
T2= -248.6 C
Absolute zero is 0K or -273.15C
It is achievable.
(b) Use the same equation but now L1A= 10.05 cm
But is it attainable?
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