posted by michaela c on .
yank hardy pulls the cord on his power mower. in order for the engine to start, the pulley must turn at 180 revolutions per minute. the pulley has a radius of 0.2 ft. how many radians per second must the pulley turn?
How fast must yank pull the cord to start the mower? when yank pulls this hard, what is the angular velocity of the center of the puller?
a. V=180rev/min * 6.28rad/rev *1min/60s
= 18.84 rad/s.
c. Va = 18.84 m/s = Angular velocity.
c. Va = 18.84rad/s. = Angular velocity.
Freda Pulliam and Yank Hardy are on opposite sides of a canal, pulling a barge with tow ropes. Freda exerts a force of 50 pounds at 20 degrees to the canal, and Yank pulls at an angle of 15 degrees with just enough force so that the resultant force vector is directly along the canal. Find the number of pounds with which Yank must pull and the magnitude of the resultant vector.