If datums are used as suggested below (A datum on shaft, B datum on face below the head, C datum on the hex flat) and order of precedence is in alphabetic order, name the datum that prevents: a. Translation along the X axis: _ b. Rotation about the X axis: _ c. Translation along the Z axis: _ d. Rotation about the Y axis: _

Ariver flows from north to south at 8 km/h. a boat is to cross this river from west to east at a speed of 20 km/h (speed of the boat with respect to the earth/ground). at what angle (in degrees) must the boat be pointed upstream such that it will proceed directly across the river (hint: find the speed of the boat with respect to water/river)? a 288 b. 21.8 c. 326 d. 30.2