3 years ago

What does combustion mean?what clues help u detemine the meaning?

2 answers:

6 0

Combustion Means the process of burning something I know this cause im in middle school and I remember this when i was in elementary school your welcome
:)

zepelin [54]3 years ago

3 0

Combustion is the process of burning something

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A student placed a ladder up against a wall as shown below. The normal force applied by the wall in the ladder will be directed:

solmaris [256]

The normal force is always perpendicular to the surface. So it would be straight to the left of the wall

6 0

3 years ago

Simplified. The absorption spectra of ions have been used to identify the presence of the elements in the atmospheres of the sun

Nookie1986 [14]

Answer:

The answer is " $3.83 \times 10^9 \ m$ "

Explanation:

Z=2, so the equation is $E= \frac{-4B}{n^2}$

Calculate the value for E when:

n=2 and n=9

The energy is the difference in transformation, name the energy delta E Deduct these two energies

In this transition, the wavelength of the photon emitted is:

$\Delta E=2.18 \times 10^{-18} ( \frac{1}{4}- \frac{1}{81})$

$\lambda = \frac{h c}{\Delta E}$

$h ( Planck's\ constant) = 6.62 \times 10^{(-34)} \ Js \\\\ speed \ of \ light = 3 \times 10^{8} \ \frac{m}{s}\\\\= \frac{6.62 \times 10^{(-34)} \times 3 \times 10^ {8}}{2.18 \times 10^{-18}} (\frac{1}{4}- \frac{1}{81}) \\\\=3.83 \times 10^9 \ m\\\\$