The tied crank and gear mechanism gives rocking motion to crank ac, necessary for the operation of a printing press. if link de has the angular motion shown, determine the respective angular velocities of gear f and crank ac at this instant, and the angular acceleration of crank ac.

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