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Olenka [21]
3 years ago
8

A football field is about 91.44 meters long. If it takes a person 35 seconds to run its length, how fast were they running in me

ters per second?
Physics
1 answer:
Lostsunrise [7]3 years ago
3 0

Answer:

2.61

Explanation:

91.44/35=2.61257142857  or 2.61

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3 years ago
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How much energy is required to ionize hydrogen when it is in the n = 5 state?
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Answer:

0.544 eV

Explanation:

To ionize the hydrogen atom n_f\rightarrow infinte

So the required energy is \Delta E=13.6(\frac{1}{n_i^2}-\frac{1}{n_f^2}) as  n_f\rightarrow infinte

So \Delta E=13.6\frac{1}{n_i^2}

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3 years ago
What is the dimension of area​
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3 years ago
At a rock concert, a dB meter registered 131 dB when placed 2.6 m in front of a loudspeaker on the stage. The intensity of the r
Pavlova-9 [17]

Answer:

Explanation:

A) 131 dB = 10*log(I / 1e-12W/m²)

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13.1 = log(I / 1e-12W/m²

1.25e13= I / 1e-12W/m²

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B) 86 dB = 10*log(I / 1e-12W/m²)

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3.98e8 = I / 1e-12W/m²

I = 3.98e-4 W/m²

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r = 14.5m ◄

6 0
3 years ago
(this is from my workbook)
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