You've experienced convection cooling if you've ever extended your hand out the window of a moving vehicle or into a flowing water stream. with the surface of your hand at a temperature of 30 degree c. determine the convection heat flux for a vehicle speed of 35 km/h in air at -5 degree c with a convection coefficient of 40 w/m2 . k and a velocity of 0.2 m/s in a water stream at 10 degree c with a convection coefficient of 900 w/m2 k. which condition would feel colder? contrast these results with a heat loss of approximately 30 w/m2 under normal room conditions.

Gas will most likely  fill the container 

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)