(Solved): 4. ( 5 pts ) A baseball weighs 149 g and is 73 mm in diameter. If it is thrown at a speed of 100 mph ...

4. ( 5 pts ) A baseball weighs 149 g and is 73 mm in diameter. If it is thrown at a speed of 100 mph with a backspin at an angular velocity of 2000 rpm , what is the lift force on the ball? What direction is the lift force acting? Assume air temperature is \( 20^{\circ} \mathrm{C} \). (Ans 0.25 N acting upwards-depends on CL used)