阿摩線上測驗
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阿摩線上測驗
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(3)(6 points)
The fish concentration distribution in a lake is given by C-5t+3x+2y+z, where C represents the fish
concentration (number of fish per cubic meter), t the time (min), and x,y;z the spatial coordinates (m). What
is the 
for an observer fixed on a boat travelling on the lake with a velocity of Vx=5 (m/min), Vy=2
(m/min) and Vz=0.