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4 years ago

What net force is required to push a sofa with a mass of 59 kilograms so that it accelerates at 9.75 meters/second^2

Chemistry

2 answers:

Tresset [83]4 years ago

6 0

Force = Mass * Acceleration = 59 kg * 9.75 m/s^2 = 575.25 N

Yanka [14]4 years ago

3 0

letter: C 5.8x10^2 newtons

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3 years ago

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Dafna11 [192]

Answer:ee

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3 years ago

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ELEN [110]

D/T=V
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3 years ago

When an excited electron in a hydrogen atom falls from ????=5 to ????=2, a photon of blue light is emitted. If an excited electr

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Answer:

n = 3

Explanation:

Given the formula for the transition energy of an atom with 1 electron:

$E=-13.6*Z^{2}*(\frac{1}{n_{f}^{2}}-\frac{1}{n_{i}^{2}} ) eV$

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$E=-13.6*(\frac{1}{4}-\frac{1}{25} ) eV=-2.856 eV$

Then we solve for nf with Z=2 (Helium)

$n_{f}=\sqrt{\frac{n_{i}^{2}*Z^{2}*13.6 eV }{2.856eV*n_{i}^{2}+13.6eV*Z^{2}} }$

$n_{f}=\sqrt{\frac{4^{2}*2^{2}*13.6 eV }{2.856eV*4^{2}+13.6eV*2^{2}} }=3$

Is near 3, actually the energy of the transitions are:

H (5⇒2) = -2.85 eV = 434 nm (Dark blue)

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I thought it was cool to see the actual colors. Included them.

4 0

3 years ago

Skepticism _____. means not having an open mind is the belief that knowledge is not certain is a quality scientists should not h

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Answer:

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3 years ago