A 4 ft radius spherical container holds helium gas at 20 psia and 95ºF. Estimate the amount of helium lost through diffusion in 24 hours if the sphere is made of silicon dioxide, SiO2 (glass) and if it is assumed that at a point 1/8 inches into the container wall from the inside the concentration of helium is zero.
What will be an ideal response?
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Estimate the heat transfer from an object at 100ºF to a surface at 40ºF through a heat conducting media having thermal conductivity of 5 Btu/hr?ft?ºF if the shape factor is 1.0 ft.
What will be an ideal response?
A -4.0-?C charge is situated at the origin of an xy-coordinate system. What is the magnitude and direction of an electric potential at x = 6.0 m?
A) 1500 V along the +x-axis B) 6000 V along the +x-axis C) -6000 V with no direction D) 4000 V along the +x-axis E) 4000 V with no direction
The electric field between square the plates of a parallel-plate capacitor has magnitude E
The potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. The magnitude of the electric field between the plates is now equal to A) E/2. B) 2E. C) E/4. D) E. E) 4E.
The reason the north pole of a bar magnet free to rotate points north is because
a. the south geographic pole of the earth is the earth's magnetic north pole. b. the south geographic pole of the earth is the earth's magnetic south pole. c. there is a net accumulation of negative magnetic charge at the earth's south geographic pole. d. there is a net accumulation of positive magnetic charge at the earth's north geographic pole. e. the north geographic pole of the earth is the earth's magnetic north pole.