The upside-down screw jack shown in Fig. often used as a foot leveler on refrigerators and other heavy appliances. Suppose the weight carried by a single foot screw is 800 N and the screw has a mean radius of 3 mm is and a lead of 1 mm. The coefficient of friction is 0.3 be- tween the screw and the refrigerator frame, and friction be- tween the screw head and the floor may be ignored. De- termine the minimum moment necessary to raise and the minimum moment to lower the corner of the refrigerator.
The upside-down screw jack shown in Fig. often used as a foot leveler on refrigerators and other heavy appliances. Suppose the weight carried by a single foot screw is 800 N and the screw has a mean radius of 3 mm is and a lead of 1 mm. The coefficient of friction is 0.3 be- tween the screw and the refrigerator frame, and friction be- tween the screw head and the floor may be ignored. De- termine the minimum moment necessary to raise and the minimum moment to lower the corner of the refrigerator.
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Transcribed Image Text:The upside-down screw jack shown in Fig.
often used as a foot leveler on refrigerators and other heavy
appliances. Suppose the weight carried by a single foot
screw is 800 N and the screw has a mean radius of 3 mm
is
and a lead of 1 mm. The coefficient of friction is 0.3 be-
tween the screw and the refrigerator frame, and friction be-
tween the screw head and the floor may be ignored. De-
termine the minimum moment necessary to raise and the
minimum moment to lower the corner of the refrigerator.
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