Awireless transmitting microphone is mounted on a small platform that can roll down an incline, directly away from a loudspeaker that is mounted at the top of the incline. the loudspeaker broadcasts a tone that has a frequency of 1.000 × 104 hz, and the speed of sound is 343 m/s. at a time of 1.5 s following the release of the platform, the microphone detects a frequency of 9733 hz. at a time of 3.5 s following the release of the platform, the microphone detects a frequency of 9378 hz. what is the acceleration a (assumed constant) of the platform?

1. when conducting a test on what kind of music increases the growth of plants, all of the following would fail to meet to fair test standard except (1 point) using different kinds of plants. giving some plants more water than others. exposing the plants to different types of music. using nutrient-rich soil for one and lesser soil for others. 2. engineering uses scientific thinking to solve real-world problems. (1 point) true false 3. what does it mean to test a hypothesis? (1 point) pass a quiz on other scientists’ results analyze only the results from scientific sources not make assumptions about how an experiment will turn out see if the results of an experiment are what the scientist predicted