Physics, 02.04.2022 06:00 sassyparker1216
Angel is setting off fireworks on New Year's Eve. The fireworks are plugged into the ground. Fireworks shoot upwards at a speed of 20 m/s and emit a sound with a frequency of 936 Hz. After moving 1.2 seconds, the fireworks explode and produce a sound with a lower frequency of 609 Hz, but with an amplitude 10 times the previous sound. Just before the fireworks shot upwards, Angel retreated at 5 m/s, then stopped as the fireworks began to slide. It is known that the speed of sound in air is 340 m/s.
a. How did Angel hear the fireworks for the first second?
b. What frequency does Angel hear when the fireworks explode?
Answers: 3
Another question on Physics
Physics, 22.06.2019 10:30
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.
Answers: 2
Physics, 22.06.2019 22:30
Compare the patterns of the two waves shown in the image. which statement is true about these waves?
Answers: 1
Physics, 22.06.2019 23:50
What is part of a line has one endpoint and continues in one direction?
Answers: 1
Physics, 23.06.2019 02:00
Two models of the same compound are shown. in what way is model b better than model a? model b shows the types of elements in the compound, but model a does not. model b shows the three-dimensional shape of the molecule, but model a does not. model b shows how the atoms in the molecule are connected, but model a does not. model b shows the number of atoms of each element in the molecule, but model a does not
Answers: 1
You know the right answer?
Angel is setting off fireworks on New Year's Eve. The fireworks are plugged into the ground. Firewor...
Questions
Computers and Technology, 04.04.2020 10:44
Mathematics, 04.04.2020 10:44
