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serious [3.7K]
3 years ago
8

A single sports fan is capable of yelling at an intensity level of 80 dB from a given distance. If 10,000 similar fans were all

yelling from the same distance, which of the following would be closest to the observed intensity level?
A. 84 dB
B. 120 dB
C. 160 dB
D. 320 dB
Physics
2 answers:
riadik2000 [5.3K]3 years ago
4 0

Answer: option "A" is correct

Explanation: the closet to understand the intensity level will be from 80db (decibels) upwards. So option a which is 84db is the answer. Thank you.

LenaWriter [7]3 years ago
3 0

Answer:

= 120dB

Explanation:

The Intensity level

L = 10 Log \frac{I_1}{I_0} for sigle fan

so,

I_1 = 10^8I_0 single fan intensity

Now intensity for 10000 fan

= 10^4 \times I_1 \\= 10^4 \times 10^8\\= 10^1^2I_0

Intensity level

L = 10log\frac{I_1}{I_0}

L = 10log \frac{10^1^2I_0}{I_0}

L = 120dB

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A revolutionary war cannon, with a mass of 2260 kg, fires a 15.5 kg ball horizontally. The cannonball has a speed of 109 m/s aft
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Answer:

The gain in velocity is 0.37m/s

Explanation:

We need solve this problem though the conservation of momentum. That is,

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Using the equation to find v_1,

v_1=\frac{m_2 v_2}{m_1}\\v_1=\frac{15.5*109}{2260}\\v_1= 0.7475

Using the conservation of energy equation, we have,

KE= \frac{1}{2}m*v^2

KE_{cball}=\frac{1}{2}(15.5)(109)^2=92077.75J

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Total KE= 92077.75+13425530=92708.9J

Now this energy over the cannonball

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92708.9=\frac{1}{2}15.5v_2^2

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What type of energy does a stove use to convert into heat
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Gekata [30.6K]

Answer:

a)P(6)=0.25

b)p(x

c)p(x\geq3)=0.9878

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Explanation:

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a)

Generally the probability that exactly 6 ask for water is mathematically given by

P(x)6=10C_6 (0..6)^6(0.4)^{10-6}

P(6)=0.25

b)

Generally the probability that  less than 9 ask for water with meal  is mathematically given by

p(xg)

p(x

p(x

p(x

c)

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d)

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Answer:

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