A fluid flows through a pipe whose cross-sectional area change from 4.00 m2 to 0.30 m2. If the fluid's speed in the wide part of the pipe is 2.5 m/s, what is its speed when it moves through the
narrow part of the pipe?
a. 0.071 m/s
b. 33.31/s
c. 1.1 m/s
d. 14 m/s

Aplane flies directly between two cities, a and b, which are separated by . from a to b, the plane flies into a headwind. on the return trip from b to a, the wind velocity is unchanged. the trip from b to a takes less than the trip from a to b. what is the airspeed of the plane, assuming it is the same in both directions

If a substance is in the gas phase, which of qualities of the gas will stay constant? a: volume b: mass c: shape d: position of particles

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?