A 900-N lawn roller is to be pulled over a 5.0-cm high curb (see Fig. 5-22). The

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A 900-N lawn roller is to be pulled over a 5.0-cm high curb (see Fig. 5-22). The radius of the roller is 25 cm. What minimum pulling force is needed if the angle θ made by the handle is 

(a) 0° and 

(b) 30°?25 cm Fig. 5-22 0 I5.0 cm

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