In what three ways does flowing water erode a stream channel?
What will be an ideal response?
Answer: Chemical weathering, hydraulic action, and abrasion.
You might also like to view...
In the experimental determination of the heat transfer coefficient between a heated steel ball and crushed mineral solids, a series of 1.5% carbon steel balls were heated to a temperature of 700°C and the center temperature-time history of each was measured with a thermocouple as it cooled in a bed of crushed iron ore that was placed in a steel drum rotating horizontally at about 30 rpm. For a 5-cm-diameter ball, the time required for the temperature difference between the ball center and the surrounding ore to decrease from 500°C initially to 250°C was found to be 64, 67, and 72 s, respectively, in three different test runs. Determine the average heat transfer coefficient between the ball and the ore. Compare the results obtained by assuming the thermal conductivity to be infinite
with those obtained by taking the internal thermal resistance of the ball into account.
GIVEN
Heat steel balls are put in crushed iron ore
Balls are 1.5% carbon steel balls
Initial temperature of balls (To) = 700°C
Ball diameter = 5 cm = 0.05 m
Temperature difference between the ball center and the ore
Center temperature of the balls decreases from 500°C to 250°C
Time taken was found to be 64, 67, and 72 s, respectively, in three different test runs
FIND
The average heat transfer coefficient between the ball and the ore.
Compare the results obtained
(a) by assuming the thermal conductivity to be infinite with
(b) those obtained by taking the internal thermal resistance of the ball into account
ASSUMPTIONS
Temperature of the iron ore is uniform and constant
SKETCH
The following images show Earth and the four jovian planets of our solar system. Rank these planets from left to right based on their distance from the Sun, from closest to farthest. (Not to scale.)
A researcher is using x-rays to investigating a cubic crystal. He is looking at Bragg reflection from the planes parallel to the cube faces
He finds that when using x-rays with a wavelength of 0.165 nm, a strong first maximum occurs when the beam makes an angle of 23.5° with the planes. What is the spacing of adjacent atoms in this crystal?
In a bucket of water, the instantaneous speed of the molecules is closest to
A. zero, since they don't move B. whatever speed the wood is moving C. approximately 1.7 meters per second D. approximately 1000 feet per second E. approximately 186,000 miles per second