MIT News
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August 11, 2001
Km Miles ====== ======== 1 0,621 10 6,21 20 12,43 30 18,64 40 24,85 50 31,07 60 37,28 70 43,50 80 49,71 90 55,92 100 62,14 500 310,69 1000 621,37
1 ft = 0.305 m
1 in = 2.54 cm
1 mi = 5280 ft
1 mi = 1.61 km
1 ft-lb = 1.36 J
1 ft-lb/s = 1.36 W
1 horsepower (hp) = 550 ft-lb/s
1 hp = 746 W
USEFUL PHYSICAL & ASTRONOMICAL DATA
Gravitational constant = 6.67 X 10^-11 N-m^2/kg^2
Speed of light, c = 3.00 X 10^8 m/s
ANNUITY FORMULA
A = P / { [ 1 - ( 1 + I /12 ) ^ -N ] / ( I / 12 ) } A=MONTHLY PMT, P=PRINCIPAL, I=ANNUAL INT, N=TERM MONTHS
=Principal/((1-((1+Interest_rate/12)^-Term_months))/(Interest_rate/12))
PRESENT VALUE FORMULA
PV = P / [ (1 + I )^N ] = P * [ (1 + I ) ^-N ]