A wing of a particular airplane is 10 m wide. During flight conditions air at 80 kPa and - 10ºC passes around the wing at 400 m/s. If the wing surface temperature is 80ºC determine: a) how much of the boundary layer is turbulent if the critical Reynolds number is taken as 5 x 10^5, b) the average convective heat transfer coefficient, and c) the heat transfer per unit area.
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A recent sunspot maximum occurred in 2001 . What is the year of the sunspot maximum that immediately follows the 2001 maximum if the solar cycle continues?
a. 2006 or 2007 b. 2012 c. 2018 d. 2023 e. the last cycle started a Maunder minimum and the next maximum cannot be predicted.
Potential of Point-Charges: The three point charges shown in the figure form an equilateral triangle with sides 4.9 cm long. What is the electric potential (relative to infinity) at the point indicated with the dot, which is equidistant from all three charges? Assume that the numbers in the figure are all accurate to two significant figures. (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 0.00 V B. 1300 V C. 640 V D. 1900 V
The area under the curve, on a Force-position (F-x) graph, represents
A) work. B) efficiency. C) kinetic energy. D) power. E) friction.
A rocket ship is 87.0 m in length when measured before leaving the launching pad. What would its velocity be if a ground observer measured its length as 62.0 m while it is in flight? (c = 3.00 × 10^8 m/s)
a. 1.61 × 10^8 m/s b. 2.14 × 10^8 m/s c. 1.48 × 10^8 m/s d. 2.10 × 10^8 m/s e. 1.91 × 10^8 m/s