7.    Height and Weight will vary, of course. Express each in customary units, then convert to meters and kilograms.For example:
            5 ft 10 in = 5 ft (12 in/ft) + 10in = 60 in + 10 in = 70 in (2.54 cm/in) = 177.8 cm (1 m/100 cm) = 1.778 m
            160 lb = 160 lb (1 kg/2.2 lb) = 72.7 kg
      All unit conversion factors such as (12 in/ft) or (2.54 cm/in) or (1 kg/ 2.2 lb) are EQUAL to 1!

12.  One L of blood has 1.20x10³ mg of cholesterol. 6.00 L of blood has
        (a)  6.00 L (1.20x10³ mg / L) = 7.2x10³ mg (1 g/ 10³ mg) = 7.2 g cholesterol.
        (b)  7.2 g (1 oz/28.35 g) = 0.254 oz

17.   70 km/h (1 mi/1.61 km) = 43.5 mi/h

20. Multiple Choice:  A. (d)    B. (a)   C. (d)   D. (a)   E. (d)   F. (a)   G. (d)   H. (c)   I. (d)   J. (c)
 

Ch. 3:     1.    R2 = (3.00 mi)2 + (2.00 mi)2     = 13.00 mi2          R = 3.60 mi

 

2.    horizontal: vx = (150 m/s) cos 30 = 130 m/s           vertical: vy = (150 m/s) sin 30  = 75 m/s

7.     v = s/t = 250 mi / 5.25 h = 47.6 mi/h

9.     v = s/t = 2000 km / 5.00 min = 400 km/min
        in 24 hours s = vt = (400 km/min) (24 h) (60 min/hr) = (400 x 24 x 60) km = 5.76x10⁵ km.
        Here the factor (60 min/hr) converts hours to minutes.