What is stream channel geometry?
A) The change in elevation of a stream.
B) The shape of a stream channel as seen on a map.
C) The amount of turbulence and laminar flow in a stream.
D) The cross-sectional area and cross-sectional shape of a stream channel.
Answer: D
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The figure shows a block on an inclined plane
What is the expression for the normal force acting on the block?
a.
?Mg
b.
?Mgcos?
c.
?Mgsin?
d.
?Mgtan?
Fluid Flow: Ideal incompressible water flows through a horizontal pipe of cross-sectional area 10.0 cm2 at a pressure of 0.250 atm with a volume flow rate of 1.00 × 10-3 m3/s. At a valve, the effective cross-sectional area of the pipe is reduced to 5.00 cm2. What is the pressure at the valve?
A. 0.112 atm B. 0.157 atm C. 0.200 atm D. 0.235 atm
Fred swings a sheet of copper in pendulum fashion between the poles of a strong magnet. The sheet slows in entering the magnetic field because it
A) induces swirling currents in the copper and accompanying magnetic fields that resist motion. B) experiences both air and magnetic friction. C) is repelled by free electrons in the copper. D) none of the above
Land and sea breezes result from
a. the Coriolis force. b. convection cycles. c. low-pressure areas. d. high-pressure areas.