Estimate the torque needed to rotate the inner cylinder at 1000 rpm if SAE-30 oil at 40°C fills the gap. Assume a linear velocity distribution in the gap. Neglect end effects.
(A) 16.0 N·m
(B) 16.9 N·m
(C) 18.8 N·m
(D) 20.2 N·m
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A series of weights connected by very light cords are given an upward acceleration of 4.00 m/s2 by a pull P, as shown in the figure. A, B, and C are the tensions in the connecting cords. The pull P is closest to
A) 690 N. B) 490 N. C) 290 N. D) 200 N. E) 50 N.
A set of data points is plotted in the graph at right. Which points should be used to find the slope of the line?
A. The blue circles. B. The red X’s. C. The green triangles.
A particle with a charge of 4.0 ?C has a mass of 5.0 × 10-3 kg. What electric field directed upward will exactly balance the weight of the particle?
A) 4.1 × 102 N/C B) 8.2 × 102 N/C C) 4.4 × 104 N/C D) 1.2 × 104 N/C E) 5.1 × 106 N/C
What is the de Broglie wavelength of a ball of mass 200 g moving at 30 m/s? (h = 6.626 × 10-34 J ? s)
A) 1.1 × 10-34 m B) 2.2 × 10-34 m C) 4.5 × 10-28 m D) 6.7 × 10-27 m