A rocket burns fuel at a rate of 199 kg/s and exhausts the gas at a relative speed of 9 km/s. Find the thrust of the rocket. Ans
1 answer:
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Answer:
The sound level of the 26 geese is
Explanation:
From the question we are told that
The sound level is
The number of geese is
Generally the intensity level of sound is mathematically represented as
The intensity of sound level in dB for one goose is mathematically represented as
Where I_o is the threshold level of intensity with value
is the intensity for one goose in
For 26 geese the intensity would be
Then the intensity of 26 geese in dB is
From the law of logarithm we have that
Answer:
The focal lenth (F) =+10.0cm
Explanation:
The formular for combined focal length (F) is given as;
In this question,
F1 = 20cm
F2 = -30cm
Plugging the values into the formuar above,
f = 58.82cm
i.e. the combination behaves as a converging lens (because of the postive sign) of focal length 58.82cm .