What is the minimum work that a motor must do to lift a 70 lb object from the floor to a height of 14 feet?

a. 5 b. 70 c. 700 d. 980 e. 2010 ft-lbs


d

Physics & Space Science

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Devil's Tower National Monument is 1280 ft high. Convert this height to meters

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Fill in the blank(s) with correct word

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A uniform rod of mass M = 1.2 kg and length L = 0.80 m, lying on a frictionless horizontal plane, is free to pivot about a vertical axis through one end, as shown. The rotational inertia of the rod about this axis is given by (1/3)ML2. If a force (F = 5.0 N, ? = 40°) acts as shown, what is the resulting angular acceleration about the pivot point?

?

?

a.
16 rad/s2

b.
12 rad/s2

c.
14 rad/s2

d.
10 rad/s2

e.
33 rad/s2

Physics & Space Science