Tập nào sau đây là không gian con của 3\: a. ( ){ }3123 1,, / 1W==⊂\ b. ( ){ }3123 1,, / 0W==⊂\ c. (){}3123 1 2,, / 1W=+=⊂\ d. ( ){ }3123 2,, / 3W==

Fluids at rest possess no flow energy. a)- true b)- false

Afluid flows with a velocity field given by v=(x/t)i.. determine the local and convective accelerations when x=3 and t=1.

At 12 noon, the count in a bacteria culture was 400; at 4: 00 pm the count was 1200 let p(t) denote the bacteria cou population growth law. find: (a) an expression for the bacteria count at any time t (b) the bacteria count at 10 am. (c) the time required for the bacteria count to reach 1800.