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Lots or aeronautic equations, but you'd need a whole lot more data than you have given.
assume river velocity = X mph boat velocity = 20 mph time to go 6 miles downstream = T1 time to go 3 miles upstream = T2 distance = time * velocity downstream: 6 mi = T1 * (boat velocity + river velocity) upstream: 3 mi = T2 * (boat velocity - river velocity) 6 = T1 * ( 20 + X ) 3 = T2 * ( 20 - X ) T1 * ( 20 + X ) = 2 * ( T2 * ( 20 - X ) ) since T1 = T2 then 20 + X = 40 - 2X 3X = 20 X = 6.67 thus, river velocity is 6.67mph
When you point a running hair dryer upward, and place a ping pong ball in the air stream, it will eventually float somewhere above the hair dryer and near the air stream. It stays above the dryer because the drag of the air balances out the ball's 2.7 grams of mass, and near the air stream due to the Bernoulli effect. The Bernoulli effect is the drop in pressure when a fluid's velocity increases; you can demonstrate it by blowing over the top of a piece of paper. It is partly responsible for the lift generated by an airplane's wing. The ball is drawn towards the center of the air stream due to the increasing velocity and the resulting Bernoulli force, but is pushed away by the air glancing off its surface. The ball maintains a position where these forces balance out, perhaps wobbling back and forth so the average forces balance out.
No. Stream up is not a compound word.
Stream has one syllable.
Deposition, whereby the sediment load being transported is dropped.
sand
Sediment that is carried by a stream along the bottom of its channel.
carrying power
matter
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Decrease in stream velocity
Decrease in stream velocity
Decrease in stream velocity
Matter
The competence of a stream is determined by the stream's velocity and the size of the sediment it can transport. Streams with higher velocities and larger sediment sizes are typically more competent and can transport larger particles.
water can cause abrasion as rock's bumpinto and scrape each other as they are moved by waves and rivers.