Forces and couples are applied to ABCDE as shown in the figure. All turns of ABCDE are 90o angles. The statically equivalent moment at A (MA) for the force2couple system is (in N?m)
(A) 2160i 1 575j 1 1480k
(B) 160i 1 425j 1 1380k
(C) 2160i 1 325j 1 1380k
(D) 2160i 1 325j 2 1480k
(C) 2160i 1 325j 1 1380k
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A hollow circular post ABC (see figure) supports a load P1 5 16 kN actat the top. A second load P2 is uniformly distributed around the cap plate at B. The diameters and thicknesses of the upper and lower parts of the post are dAB 5 30 mm, tAB 5 12 mm, dBC 5 60 mm, and tBC 5 9 mm, respectively. The lower part of the post must have the same compressive stress as the upper part. The required magnitude of the load P2 is approximately:
(A) 18 kN
(B) 22 kN
(C) 28 kN
(D) 46 kN
If we know the size of an asteroid, we can determine its density by
A) comparing its reflectivity to the amount of light it reflects. B) looking for brightness variations as it rotates. C) determining its mass from its gravitational pull on a spacecraft, satellite, or planet. D) radar mapping. E) spectroscopic imaging.
A cylindrical insulated wire of diameter 5.0 mm is tightly wound 200 times around a cylindrical core to form a solenoid with adjacent coils touching each other
When a 0.10 A current is sent through the wire, what is the magnitude of the magnetic field on the axis of the solenoid near its center? (?0 = 4? × 10-7 T • m/A) A) 6.6 × 10-5 T B) 2.5 × 10-5 T C) 1.3 × 10-5 T D) 3.6 × 10-5 T E) 9.8 × 10-5 T
What is the phase angle in a series RLC circuit at resonance?
1.180° 2.90° 3.0 4.-90° 5.None of these answers is necessarily correct.