Oil separates a 20-mm-diameter rotating shaft from its 20.5-mm-diameter bearing. The bearing is 80 cm long and the shaft rotates at 2000 rpm. The velocity gradient at the bearing surface is nearest:
surface is nearest:
(A) 6840 m/s/m
(B) 7260 m/s/m s
(C) 8040 m/s/m
(D) 9406 m/s/m
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Imagine that the wave shown below moves right along a stretched string. It meets and passes through one of the left-going waves provided in the choices. For which choice is there an instant where the string is flat?
A. A
B. B
C. C
D. D
E. None of the above
The buoyant force that acts on a 10-ton ship floating in the ocean is
A) less than 10 tons. B) 10 tons. C) greater than 10 tons. D) depends on the density of seawater
A simply supported laminated beam of length L 5 0.5 m and square cross section weighs 4.8 N. Three strips are glued together to form the beam, with the allowable shear stress in the glued joint equal to 0.3 MPa. Considering also the weight of the beam, the maximum load P that can be applied at L/3 from the left support is approximately:
(A) 240 N
(B) 360 N
(C) 434 N
(D) 510 N
Jupiter completes one revolution about its own axis every 9.92 hours. What is the radius of the orbit required for a satellite to revolve about Jupiter with the same period? Jupiter has a mass of 1.90 × 1027 kg and G = 6.67 x 10-11 N•m2/kg2
A) 1.04 × 107 m B) 2.26 × 109 m C) 1.60 × 108 m D) 3.41 × 108 m E) 7.45 × 108 m