Page 143 - Physics - XII

Appendix - I : Useful Conversion Useful Conversion
Appendix - I :
Factors
Factors

Length Time
1 km = 0.6215 mi 1 h = 60 min = 3.6 ks
1 mi = 1.609 km 1 d = 24 h = 1440 min = 86.4 ks
1 m = 1.0936 yd 1 y = 365.24 d = 31.56 ms
= 3.281 ft = 39.37 in
1 in = 2.54 cm Volume
6
1 ft = 12 in = 30.48 cm 1 m 3 = 10 cm 3
–3
3
1 yd = 3 ft = 91.44 cm = 36 inch 1 L = 1000 cm = 10 m 3
1 light year = 1 ly = 9.461 × 10 m 1 gal = 3.786 L
15

1A = 0.1 nm 1 gal = 4 qt = 8 pt = 128 oz = 231 in 3
3
3
Area 1 in 3 = 16.39 cm
1 ft
= 1728 in = 28.32 L
3
1 m 2 = 10 cm 2 = 2.832 × 10 cm 3
4
4
1 km 2 = 0.3861 mi = 247.1 acres
2
1 in 2 = 6.4516 cm 2 Speed
–1
1 ft 2 = 9.29 × 10 m 2 1 km h –1 = 0.2778 m s = 0.6215 mi h –1
–2
–1
1 m 2 = 10.76 ft 2 1 mi h –1 = 0.4470 m s = 1.609 km h –1
1 acre = 43560 ft 2 1 mi h –1 = 1.467 ft s –1
1 mi 2 = 460 acres = 2.590 km 2 Magnetic Field
Angle and Angular Speed 1 G = 10 T
–4
π rad = 180° 1 T = 1 Wb m = 10 G
4
–2
1 rad = 57.30° Pressure
1° = 1.745 × 10 rad 1 Pa = 1 Nm –2
–2
1 rev min –1 = 0.1047 rad s –1
1 rad s –1 = 9.549 rev min –1 1 bar = 100 kPa
1 atm = 101.325 kPa = 1.01325 bar
Mass 1 atm = 14.7 lbf/in = 760 mm Hg
2
1 kg = 1000 g = 29.9 in Hg = 33.8 ft H O
1 tonne = 1000 kg = 1 mg 1 lbf in –2 = 6.895 kPa 2
1 u = 1.6606 × 10 kg
–27
1 kg = 6.022 × 10 u Energy 1 kWh = 3.6 MJ
26
1 slug = 14.59 kg 1 cal = 4.186 J
1 kg = 6.852 × 10 slug 1 ft lbf = 1.356 J = 1.286 × 10 Btu
–2
–3
1 u = 931.50 MeV/c 2 1 L atm = 101.325 J
Density 1 L atm = 24.217 cal
1 g cm –3 = 1000 kg m = 1 kg L –1 1 Btu = 778 ft lb = 252 cal = 1054.35 J
–3
1 eV = 1.602 × 10 J
–19
Force 1 u c 2 = 931.50 MeV
1 N = 0.2248 lbf = 10 dyne 1 erg = 10 J
5
–7
1 lbf = 4.4482 N 1 torr = 1 mm Hg = 133.32 Pa
1 kgf = 2.2046 lbf Power
1 horse power, HP = 550 ft lbf/s = 745.7 W

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