Determine the speed of sound in air at (a) 300 k and (b) 800 k. Also determine the mach number of an aircraft moving in air at a velocity of 330 m/s for both cases. The gas constant of air = 0. 287 kj/kg k. The specific heat ratio of air at room temperature is 1. 4.

Alaser tag arena sells two types of memberships. one package costs $325 for one year of membership with an unlimited number of visits. the second package has $125 enrollment fee, includes five free visits, and costs and additional $8 per visit after the first five. how many visits would a person need to use for each type of membership to cost the same amount over a one-year period?

Which of the following best describes the difference between “autobiography” and “memoir”? a. autobiography is written about the author's own interpretation of events; memoir is a written interpretation of events. b. memoir covers a particular time in the writer’s life or recounts life events around one or two themes; autobiography covers the entire story of the author's life and has multiple themes. c. autobiography covers the entire story of the writer's life and has multiple themes; memoir is a shorter written work with one theme. d. autobiography covers entire story of the writer's life and has multiple themes; memoir is the writer’s random memories about past experiences.

Jerrold has to buy 12 copies of a textbook which costs $36.25 per copy. how much must he spend for them?