What resistance must be put in series with a 450-mH inductor at 5000 Hz for a total impedance of 40000 ??
A) 45 k? B) 37 k? C) 40 k? D) 26 k?
B
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Carburizing iron is a process to increase its strength by diffusing carbon into the metal. If the process carried out at 500ºC, estimate the mass diffusion rate into the iron when the carbon concentration is 2.3% (by volume) at a depth of 2 mm. Assume that the iron is face-centered cubic (FCC) and the carbon concentration at the surface is 100%.
What will be an ideal response?
Newton's Second Law in 2 Dimensions: Two forces act on a 55-kg object. One force has magnitude 65 N directed 59° clockwise from the positive x-axis, and the other has a magnitude 35 N at 32° clockwise from the positive y-axis. What is the magnitude of this object's acceleration?
A. 1.1 m/s2 B. 1.3 m/s2 C. 1.5 m/s2 D. 1.7 m/s2
Rainbows are caused by sunlight being
A) dispersed. B) dispersed, refracted, & reflected. C) refracted. D) reflected. E) refracted & reflected but not dispersed.
A rectangular stack of lead bricks measures 2 m by 3 m by 4 m. The mass density of lead is 11,340 kilograms per cubic meter. What is the total mass of the stack of lead?