In order to get large payloads into space using chemical rockets,
A) multiple rocket stages are necessary
B) extremely large single-staged rockets must be used
C) very lightweight rockets
D) rockets must be launched from the tops of tall mountains
A
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A__________is a type of active galaxy nucleus that is especially variable and has few or no spectral emission lines
A) blazar B) pulsar C) quasar D) quark
Consider two steel rods, A and B. B has three times the area and twice the length of A, so Young's modulus for B will be what factor times Young's modulus for A?
a. 3.0 b. 0.5 c. 1.5 d. 1.0
Series/Parallel Circuits: Three resistors with resistances of 2.0 ?, 6.0 ?, and 12 ? are connected across an ideal dc voltage source V as shown in the figure. If the total current through the circuit is I = 2.0 A, what is the applied voltage V?
A. 6.0 V B. 3.0 V C. 2.0 V D. 2.7 V E. 1.5 V
The equation has been proposed by Hausen for the transition range (2300 < Re < 8000) as well as for higher Reynolds numbers. Compare the values of Nu predicated by Hausen’s equation for Re = 3000 and Re = 20,000 at D/L = 0.1 and 0.01 with those obtained from Gnielinski correlation. Assume the fluid is water at 15°C flowing through a pipe at 100°C.
GIVEN
• Water flowing through a pipe
• The Hausen correlation given above
• Water temperature = 15°C
• Pipe temperature = 100°C
FIND
• The Nusselt number using the Hausen correlation and appropriate equations and charts in the text for Re = 3000 and 20,000 and D/L = 0.1 and 0.01
ASSUMPTIONS
• Steady state
• Constant and uniform pipe temperature
SKETCH
PROPERTIES AND CONSTANTS
for water at 15°C
Absolute viscosity (?b) = 1136 × 10–6 (Ns)/m2
Prandtl number (Pr) = 8.1 At 100°C ?s = 277.5 × 10–6 (Ns)/m2
Prs= 1.75