What is the minimum velocity needed for a 0.8 mm sand particle transition from a

Question

What is the minimum velocity needed for a 0.8 mm sand particle transition from a state of deposition to transportation based on the chart at ight? 1000 100 50 Transportati on (above settling velocity) A) 5 cm/sec B) 1 cm/sec C) 15 cm/sec D) 23 cm/sec 10 What is the minimum velocity needed0.5 Deposition (below settling velocity for a 0.S mm sand particle transition from a state of deposition to transportation based on the chart at right? 10 100 SandCoarse material 001 0.01 0.1 1.0 Clay Silt A) 5 cm sec B) 1 cm sec C) 15 cm sec D) 23 cm sec A stream is transporting Particle A The velocity of stream is decreasing, but for the moment Particle A is still moving However. when the water drops below 50 cm sec. Particle A falls below its fall velocity and is deposited Based on this infomation, what is the likely particle size for this object based on the chart above? A) 001 mm B) 0.1 mmn C) 5 mm D) 10 mm

Explanation / Answer

in a graph , there is a red line which shows settling velocity. above than this graph line particle will be carried out by the water and below that line particle will be deposited. we can understand this concept of graph by an example. ex . lets take flow velocity of water 10 cm/ sec , we can see that y axis 's 10 cm/sec line intersecting red settling velocity's line at 1 cm line, so we can conclude by this , with this speed water can carry sand particles upto the size of 1 cm . but greater than this size, particles will be deposited. so here we are-

1. what is the minimum velocity needed for a 0.8 mm sand particle transition from a state of deposition to transportation based on the chart at right?

answer- sand particle size is 0.8 mm ,

so we will use the above concept of the intersections of lines , we will found the line of 0.8 mm , which is intersect settling velocity line then we can easily conclude that water can carry this particle with the speed of 5 cm/sec. so the right answer is A) 5 cm/sec

2. a stream is transporting particle A . the velocity of stream is decreasing but for the moment particle A is still moving . however , when the water drops below 50 cm/sec . particle A falls below its fall velocity and is deposited . based on the information . what is likely the particle size for this object based on the chart above?

answer- given that particle carried by water when its speed is above than 50 cm/sec but when velocity is comes under the 50 cm/sec then particle deposited, so in this case based on the above concept we have o find the intersection of the line of 50 cm/sec and settling velocity , and at that point the value on x axis will be our answer.

this intersection point is found at the approximate 10 mm , so our answer is

D) 10 mm

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