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

Oxygen undergoes an isentropic expansion from 120 degree c and 280 kpa absolute to 140 kpa absolute. determine the final temperature of the oxygen and the amount of work per kg of o_2 produced in the process if it is adiabatic.

While studying chemical reactions and conservation of matter, sarah's class conducted a variety of experiments. sarah and her lab partner found the mass of a wax candle and placed the candle in a flask. the students lit the candle and let it burn to completion. all that was left was wax and charred candle wick. per their teacher's instructions, the students found the mass of the products. their data can be seen in the data table. formulate a hypothesis the students could test to explain why the experiment did not support the law of conservation of matter. a) the students could repeat the experiment using different candles; there might have been a flaw in the candle. b) the experiment should be repeatable. the students should run several trials and then take an average of the after mass in each trial. c) the students should have someone in the class check their measurement skills as they repeat the experiment. they may have made an error using the balance. d) the students should burn the candle in a container that has some type of lid so that any gas that is a product of the reaction can be contained and massed. submit

Convection currents are caused by differences in what two things?