What is meant by an entrance region?
What will be an ideal response?
An entrance region refers to flow of a fluid in a closed channel such as a tube,
pipe, or duct and the region at the entrance the fluid velocity will develop into a
fully developed flow with a uniform velocity profile beyond the entrance. At the
entrance region the fluid velocity will gradually change from a straight velocity,
or free stream velocity as it enters to the fully developed state.
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Lunar eclipses do not occur every full Moon, because the path of the ________ is tilted relative to the ________.
A. Sun; ecliptic B. Moon; ecliptic C. Earth; ecliptic D. Moon; equator
The sensitive dependence upon initial conditions of the evolution of some physical systems is a feature of __________
Fill in the blank(s) with correct word
How long is a wire made from 100 cm3 of copper if its resistance is 4.0 ohms? The resistivity of copper is 1.7 × 10^–5 ?·m
a. 4.9 m b. 1.7 × 10^2 m c. 2.6 × 10^2 m d. 1.5 × 10^3 m e. 24 m
A 30. kg child stands at one end of a floating 20. kg canoe that is 10. ft long. The child walks to the other end of the canoe. How far does the canoe move in the water assuming water friction is negligible?
A) 10. ft B) 4.0 ft C) 6.0 ft D) 8.0 ft E) 2.0 ft