Technician A says direct current (DC) flows in two directions. Technician B says alternating current (AC) flows in two directions. Who is correct?
A. A only
B. B only
C. both A and B
D. neither A nor B
Answer: B
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0.5 kg of methane is initially at 500 kPa and 25°C. The methane expands in an isothermal process until its final volume is twice its initial volume. Assuming the methane behaves as an ideal gas with constant specific heats, determine (a) the initial volume, (b) the final pressure, (c) the change in specific internal energy and (d) the change in specific enthalpy of the methane.
Given: m = 0.5 kg; P1 = 500 kPa; T1 = T2 = 25°C = 298 K (isothermal process); V2 = 2V1
Scientists believe that bees use the ____________________ to orient their flight and communicate this orientation to worker bees in the hive
Fill in the blank(s) with correct word
The ____________________ are tubes that carry the products of photosynthesis to parts of the plant other than the leaves
Fill in the blank(s) with correct word
The axial tension is ____________________ to the torque applied in certain conditions, the most common of which being clean, dry threads.
Fill in the blank(s) with the appropriate word(s).