Four moles of nitrogen gas are contained in an enclosed cylinder with a movable piston. If the molecular mass of nitrogen is 28 u, how many grams of nitrogen are present?
a. 0.14
c. 42
b. 56
d. 112
D
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Estimate the diffusion of O2 from dry air into water at 60ºF if the oxygen concentration is 3 x 10^-4 lbm?mol/ft^3 1 inch below the water surface. Assume air is 20% oxygen.
What will be an ideal response?
A solid concrete wall 4.0 m by 2.4 m and 30 cm thick, with a thermal conductivity of 1.3 W/(m ? K), separates a basement at 18°C from the ground outside at 6°C. Under steady state conditions, how much heat flows through the wall in one hour?
A) 1.8 MJ B) 1.8 kJ C) 500 J D) 5.0 MJ E) 5.0 kJ
Resistance and Resistivity: When a potential difference is applied across a piece of wire made of metal A, a 5.0-mA current flows. If the metal-A wire is replaced with a wire made of metal B having twice the diameter of the metal-A wire, how much current will flow through the metal-B wire? The lengths of both wires are the same, and the voltage difference remains unchanged. The resistivity of metal A is 1.68 × 10-8 ? ? m, and the resistivity of metal B is 1.59 × 10-8 ? ? m.
A. 21 mA B. 19 mA C. 11 mA D. 5.3 mA
A soccer ball is kicked with a velocity of 25 m/s at an angle of 45° above the horizontal. What is the vertical component of its acceleration as it travels along its trajectory? (Neglect air friction.)
A) g sin(45°) upward B) g downward C) zero D) g cos(45°) downward E) g upward