An aluminum tube (E 5 72 GPa) AB of circular cross section has a pinned support at the base and is pin-connected at the top to a horizontal beam supporting a load Q 5 600 kN. The outside diameter of the tube is 200 mm and the desired factor of safety with respect to Euler buckling is 3.0. The required thickness t of the tube is most nearly:
(A) 8 mm
(B) 10 mm
(C) 12 mm
(D) 14 mm
(B) 10 mm
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If the radiant energy from the sun comes in as a plane EM wave of intensity 1340 W/m2, calculate the peak values of E and B
a. 300 V/m, 10?4 T b. 1 000 V/m, 3.35 × 10^?6 T c. 225 V/m, 1.60× 10?3 T d. 111 V/m, 3.00 × 10^?5 T e. 711 V/m, 2.37 × 10^?6 T
Three coplanar parallel straight wires carry equal currents I to the right as shown below. The current in the upper two wires is directed to the right, but the current in the bottom wire is directed to the left. Each pair of wires is a distance a apart. The direction of the magnetic force on the middle wire
a.
is up out of the plane of the wires.
b.
is down into the plane of the wires.
c.
is in the plane of the wires, directed upwards.
d.
is in the plane of the wires, directed downwards
e.
cannot be defined, because there is no magnetic force on the middle wire.
Aluminum wire has resistivity of 0.286 x 10^-7 ohm-m where resistivity is defined as ohmarea/length. Determine the temperature distribution through an aluminum wire of ¼ inch diameter carrying 200 amperes of current if it is surrounded by air at 80ºF and with a convective heat transfer coefficient of 200 Btu/hr?ft^2?ºF.
What will be an ideal response?
What is the meaning of a "closed" universe?
A) The universe will expand forever. B) The universe will someday stop expanding and start to collapse. C) The universe will stop expanding in an infinite amount of time. D) The universe is in a steady-state. E) The universe will disappear into a white hole in time.