{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Exam_II_cover_2008

# Exam_II_cover_2008 - 2 PE = mgh F = m a P= P o ρ gh PV =...

This preview shows page 1. Sign up to view the full content.

NAME:_____________ P110/120 Exam I I 6 Nov. 2008 ( 115 points) This is a closed-book, closed-notes exam. Some of the information you will need is given below. Some conversion factors, equations, and physical parameters that you might find useful: 1Btu = 1055 J : 1 cal = 4.186 J : 1 hp = 746 W : 1 ft.lb = 1.356 J g= 9.8 m/s 2 Properties of water: density: 1000 kg/m 3 Specific heat = 4186 J/kg.K =4.186 kJ/kg.K, = 1.00 Btu/lb. o F Latent Heat of Fusion = 334 kJ/kg, Latent Heat of Vaporization = 2260 kJ/kg 1 jelly doughnut has an energy content of roughly 1 MJ. 1 barrel of oil has an energy content of roughly 6.12x10 9 J = 5.8x10 6 Btu 1 ton of bitunminous coal has an energy content of roughly 2.5x10 7 Btu 10 6 cu.ft. of natural gas has an energy content of roughly 1.05x10 12 J 1 gal of gasoline has an energy content of roughly 1.24x10 5 Btu 1 Btu = 1055 J 1kW.h = 3.6x10 6 J = 3412 Btu. Useful Equations: P = σε AT 4 ( σ = 5.67x10 -8 W/m 2 .K 4 ) : λ peak T = 2898 μ m.K
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 2 : PE = mgh : F = m a : P= P o + ρ gh : PV = nR T (Q/ ∆ t) = k (A/L) ∆ T = (A/R) ∆ T : W = F || d : (Q infil / ∆ t) = (0.018 Btu/ft 3 .F o ) V K ∆ T Q = mc ∆ T : W + Q = ∆ ( PE + KE + TE) : η Carnot = 1 – T C /T H T (Kelvin) = T( o C) + 273.15 K Useful Prefixes: E (exa) 10 18 : P (Peta) 10 15 : T (tera) 10 12 : G (giga) 10 9 : M (mega) 10 6 : k (kilo) 10 3 m (milli) 10-3 : μ (micro) 10-6 : n (nano) 10-9 Some R values of importance: Fiberglass insulation (3.5”thick) R = 10.9 ft 2 .h. o F/Btu Plywood (0.75” thick) R = 0.93 ft 2 .h. o F/Btu Sheetrock (1/2” thick) R = 0.45 ft 2 .h. o F/Btu Wood siding (1/2” thick) R = 0.81 ft 2 .h. o F/Btu Hardwood floor (3/4” thick) R = 0.69 ft 2 .h. o F/Btu Asphalt roofing Shingles R = 0.44 ft 2 .h. o F/Btu Single pane window R = 0.88 ft 2 .h. o F/Btu Double pane window (1/2” gap) R = 1.72 ft 2 .h. o F/Btu...
View Full Document

{[ snackBarMessage ]}