Imcompressible liquid flows through a pipe with velocity vo. the pipe then splits into two smaller branches, each with 1/3 the area of the original pipe. what is the velocity of the liquid in one of the smaller branches?

No because scientist are still changing there mines today so they are not correct to this day

  concave means having an outline or surface that curves inward like the interior of a circle or sphere. so the mirror curves inward.

The figure is missing but we can answer anyway.the correct answer is "releasing the string". in fact, when the person is holding the bow and the arrow, the kinetic energy of the arrow is still zero (because the arrow is not moving). the moment the arrow is released, it acquires a velocity v, so its kinetic energy will become different from zero: where m is the mass of the arrow and v its velocity.  all the other options, instead, do not increase the kinetic energy of the system: -  pulling farther back on the string : this will just increase the elastic potential energy of the system-  holding the arrow higher: this will increase the gravitational potential energy of the system (which is given by u=mgh, where h is the height above the ground)-  decreasing the mass of the arrow: this will decrease the gravitational potential energy of the system (which is given by u=mgh, where m is the mass)