A beam is pin-connected to the tops of two identical pipe columns, each of height h, in a frame. The frame is restrained against sidesway at the top of column 1. Only buckling of columns 1 and 2 in the plane of the frame is of interest here. The ratio (a/L) defining the placement of load Qcr, which causes both columns to buckle simultaneously, is approx-imately:
(A) 0.25
(B) 0.33
(C) 0.67
(D) 0.75
(B) 0.33
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Standing waves can result from _____ waves
a. longitudinal b. transverse c. both longitudinal and transverse d. neither longitudinal nor transverse
The rate at which air temperature changes with altitude is called
a. the inversion rate. b. vertical development. c. the lapse rate. d. an isotherm.
Series/Parallel Circuits: Four resistors are connected across an ideal dc source of V = 8.0 V, as shown in the figure. Assume all resistances shown are accurate to two significant figures. What is the current through the 9.0-? resistor?
A. 1.0 A B. 0.67 A C. 0.50 A D. 0.90 A E. 2.0 A
A 910-kg object is released from rest at an altitude of 1200 km above the north pole of the earth
If we ignore atmospheric friction, with what speed does the object strike the surface of the earth? (G = 6.67 × 10-11 N ? m2/kg2, Mearth = 5.97 × 1024 kg, the polar radius of the earth is 6357 km) A) 2.2 km/s B) 4.5 km/s C) 2.7 km/s D) 4.8 km/s E) 3.2 km/s