The answer is flight technology, satelite technology, and exploration technology.
The flight technology include advances in jet propulsion and navigation. Satelite have become more and more powerful and hecne communication with distant objects is increasing in efficiency. The emergence of AI robots in space exploration are reducing risks to humans in these deep ventures.
Part of the
archeabactria
Complementary angles are those whose sum is 90 degrees, right?, then let's find A, A=72 degrees, because its mid point is 36 deg. Then, B = 18 degrees and its mid point is 9 degrees! :)
Vì khi chiếu tia tới vuông góc một mặt phẳng gương, tia tới trùng với pháp tuyển, góc tới bằng góc phản xạ bằng 0.
Answer:Changing Length
Explanation:
We know the Resonant frequency depends upon length and varies as inversely to the length of air column

thus by changing the length of Pipe we can chnge the frequency