1. A river flows from north to south at 10mph. A boy observes a boat crossing this river from west to east. The captain

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1 A River Flows From North To South At 10mph A Boy Observes A Boat Crossing This River From West To East The Captain 1 (60.55 KiB) Viewed 34 times

1. A river flows from north to south at 10mph. A boy observes a boat crossing this river from west to east. The captain of the boat is steering at a speed of 25mph (speed of the boat with respect to the water) with a certain angle within the north-west quadrant. At what angle must the boat be pointed upstream such that it will proceed directly across the river? Draw a vector triangle to prove your answer. Find the speed of the boat observed by the boy. 2. Member BC of the mechanism shown in Figure P12−40 is 0.8 m long. Using the relative velocity equation method, determine the velocity of point C. 3. Solve the previous mechanism using the instantaneous center of rotation.