Glycerin at 20ºc fills the space between a hollow sleeve of diameter 14.75 cm and a fixed coaxial solid rod of diameter 13 cm. the outer sleeve is rotated at 175 rev/min. assuming no temperature change, estimate the torque required, in n∙m per meter of rod length, to hold the inner rod fixed. (round the final answer to three decimal places.)

It really doesn't matter for any of the questions that you've listed.

B) erini just took the test and it is correct

Since you have not included the experiment situation and the data, of course, i can not give you specific details about it. but i can you with this question.1) i will assume that the motion is projectile (parabolic) motion.2) yes, the horizontal distance depends on the horizontal velocity as, naming vx the horizontal velocity and t the time, it is: x = vx × t3) now, observe that the flight time depends on the vertical velocity as, naming voy the initial vertical velocity, t the time and y the vertical distance before reaching the ground: y = yo + voy×t - gt² / 2.the higher the initial vertical velocity (voy) the longer the object will be flying and so t will be higher in the equation for the horizontal distance.that explains the relationship between the horizontal distance and the horizontal velocity.