PLEASE HELP! :) Frequency describes the rate in which waves move through a given location. In the simulation, the airplane emits waves
as it travels. The closer together the waves appear, the higher their frequency appears.
Imagine you're standing at the center of the simulation, and the airplane flies directly overhead with an object speed of 50
meters per second. From your perspective, how does the frequency of the waves appear to change as the airplane
approaches and then passes you?

An ideal otto cycle has a compression ratio of 8. at the beginning of the compression process, air is at 95 kpa and 27°c, and 750 kj/kg of heat is transferred to air during the constant-volume heat-addition process. assuming constant specific heats at room temperature, determine (a) the pressure and temperature at the end of the heat-addition process, (b) the net work output, (c) the thermal efficiency, and (d) the mean effective pressure for the cycle. (4390 kpa, 1730 k; 423 kj/kg; 56.4%; 534 kpa)

Which statements best describe medical uses for radioactive isotopes? check all that apply. radioactive isotopes are used to detect medical problems. high-energy gamma rays are injected into the body. radioactive isotopes are used to treat some diseases. radiation is used to kill cancer cells. radioactive isotopes are directed at tumors from outside the body.

·sound · parallel · mechanical · not a vacuum · needs a medium · compressions and rarefaction what type of wave is being described? a) compaction b) electromagnetic c) longitudinal d) transverse