Aperson is pushing a lawnmower of mass m d 38 kg and with h d 0: 75 m, d d 0: 25 m, `a d 0: 28 m, and `b d 0: 36 m. assuming that the force exerted on the lawnmower by the person is completely horizontal and that the mass center of the lawnmower is at g, and neglecting the rotational inertia of the wheels, determine the minimum value of this force that causes the rear wheels (labeled a) to lift off the ground. in addition, determine the corresponding acceleration of the mower.

Abatter hits the baseball a with an initial velocity of v0 = 110 ft/sec directly toward fielder b at an angle of 23° to the horizontal; the initial position of the ball is 2.2 ft above ground level. fielder b requires 0.44 sec to judge where the ball should be caught and begins moving to that position with constant speed. because of great experience, fielder b chooses his running speed so that he arrives at the “catch position” simultaneously with the baseball. the catch position is the field location at which the ball altitude is 8.4 ft. determine the velocity of the ball relative to the fielder at the instant the catch is made.

Abearing is designed to a reduce friction b. support a load c.guide moving parts such as wheels, shafts and pivots d. all of the above

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