Stars with surface temperatures near 10,000 K have the strongest hydrogen absorption lines in their spectra.
Answer the following statement true (T) or false (F)
True
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Self-Inductance: A coil with a self-inductance of 6.0 H has a constant current of 2.0 A flowing through it for 2.0 s. What is the emf induced in this coil?
A. 6.0 V B. 12 V C. 0.0 V D. 4.0 V E. 8.0 V
Reconsider the heat exchanger of Problem 6.38 with an externally finned-tube bundle used to enhance the air-side heat transfer coefficient in the pre-heater. If thin circular fins are attached on the outside of the tubes such that the surface extension ratio ?=1.12, determine the average air-flow heat transfer coefficient for this finned-tube bank. Compare the results with those for the un-finned or bare tube bank and comment upon the extent of heat transfer enhancement achieved by adding fins.
GIVEN
FIND
The average heat transfer coefficient (c h) and extent of heat transfer enhancement achieved by
adding fins.
ASSUMPTIONS
Steady state
PROPERTIES AND CONSTANTS
A 6.0-kg object moving 2.0 m/s in the positive x direction has a one-dimensional elastic collision with a 4.0-kg object moving 3.0 m/s in the opposite direction. What is the total kinetic energy of the two-mass system after the collision?
a. 30 J b. 62 J c. 20 J d. 44 J e. 24 J
The radial velocity method is less likely to detect low mass planets than high mass planets because low mass planets cause smaller ________ fluctuations
Fill in the blank(s) with correct word