Based on dr. fontenot's presentation, select only the statements below which are correct. correct answers receive 100% positive partial credit. incorrect answers receive 50% negative partial credit. the score is the sum of partial credits but not less than zero.

a. communication requires that your audience must agree with you.
b. written engineering communication is frequently task oriented.
c. forming mental models about your audience increases the noise in communication.
d. powerpoint presentations are rarely over used or misused.
e. the rule of 7 in powerpoint presentations refers to the maximum recommended number of images on a slide

Picture a all traveling at a constant speed around the inside of a circular structure. is the ball accelerating? explain your answer

1. consider the case in which air fills air shocks on a truck trailer. the pressure in the shocks is 2 mpa. the temperature is 300 k. the diameter of the shock piston is 10 cm and the initial length of the cylindrical cavity containing the compressed air is 40 cm. a. the truck is gradually loaded over a period of a day in a static setting. the temperature is held constant for the atmosphere and thus for the gas shock. calculate the compressibility of the air in the shock for this condition when the truck is initially being loaded. b. if the shocks were loaded in a dynamic setting by driving over bumps, what would be the compressibility? state your assumption. c. what is the initial load on the shock if the shock is in an atmospheric 100 kpa? d. if the shock is compressed using the process described in part a, and the air shock compressed air cavity length decreases to 20 cm, what is the additional load applied to the shock?

Air is to be preheated by hot exhaust gases in a cross-flow heat exchanger before it enters the furnace. air enters the heat exchanger at 95 kpa and 20°c at a rate of 0.6 m^3/s. the combustion gases (cp = 1.10 kj/kg°c) enter at 160°c at a rate of 0.95 kg/s and leave at 95°c. determine the rate of heat transfer to the air and its outlet temperature.