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3 years ago

8

When a electric current is passed threw water during electrolysis, 2 gases are formed. 1 gas has a boiling point of -183°C and t

he other has a boiling point of -253°C. Has a physical or a chemical change occurred? Explain please.

1 answer:

Keith_Richards [23]3 years ago

8 0

Answer:

Sorrry so very hard

Ok hahaha

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Which of the following statements describes a way that simple machines make work easier?

Elina [12.6K]

Pretty sure it's the last one:
"reduce the size of the input force needed to perform a task"

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3 years ago

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A Young'sdouble-slit interference experiment is performed with monochromatic light. The separation between the slits is 0.44 mm.

Artyom0805 [142]

Answer:

Explanation:

The double slit interference phonemene is described for the case of constructive interference

d sin θ= m λ (1)

let's use trigonometry to find the sinus

tan θ = y / L

in general in interference phenomena the angles are small

tan θ = sin θ / cos θ = sin θ

The double slit interference phonemene is described for the case of constructive interference

d sin θ = m lam (1)

let's use trigonometry to find the sinus

tan θ = y / L

in general in interference phenomena the angles are small

tan θ = sin θ / cos θ = sin θ

we substitute

sin θ = y / L

we substitute in equation 1

d y / L = m λ

λ = dy / L m

let's reduce the magnitudes to the SI system

d = 0.44 mm = 0.44 10⁻³ m

y = 5.5 mm = 5.5 10⁻³ m

L = 4.2m

m = 1

let's calculate

λ = 0.44 10⁻³ 5.5 10⁻³ / (4.2 1)

λ = 5.76190 10-7 m

let's reduce to num

lam = 5.56190 10-7 m (109 nm / 1m)

lam = 556,190 nmtea

we substitute

without tea = y / L

we substitute in equation 1

d y / L = m lam

lam = dy / L m

let's reduce the magnitudes to the SI system

d = 0.44 me = 0.44 10-3 m

y = 5.5 mm = 5.5 10-3

L = 4.2m

m = 1

let's calculate

lam = 0.44 10⁻³ 5.5 10⁻³ / (4.2 1)

lam = 5.76190 10⁻⁷ m

let's reduce to num

lam = 5.56190 10⁻⁷ m (109 nm / 1m)

lam = 556,190 nm

6 0

4 years ago

Why is blood important

Margarita [4]

Blood is essential for good health because the body depends on a steady supply of fuel and oxygen to reach its billions of cells. Even the heart couldn't survive without blood flowing through the vessels that bring nourishment to its muscular walls.

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3 years ago

Consider a double-slit with a distance between the slits of 0.04 mm and slit width of 0.01 mm. Suppose the screen is a distance

scZoUnD [109]

Answer:

The distance between the places where the intensity is zero due to the double slit effect is 15 mm.

Explanation:

Given that,

Distance between the slits = 0.04 mm

Width = 0.01 mm

Distance between the slits and screen = 1 m

Wavelength = 600 nm

We need to calculate the distance between the places where the intensity is zero due to the double slit effect

For constructive fringe

First minima from center

$x_{1}=\dfrac{\lambda D}{2d}$

Second minima from center

$x_{2}=\dfrac{3\lambda D}{2d}$

The distance between the places where the intensity is zero due to the double slit effect

$\Delta x_{d}=x_{2}-x_{1}$

$\Delta x_{d}=\dfrac{3\lambda D}{2d}-\dfrac{\lambda D}{2d}$

$\Delta x_{d}=\dfrac{\lambda D}{d}$

Put the value into the formula

$\Delta x_{d}=\dfrac{600\times10^{-9}\times1}{0.04\times10^{-3}}$

$\Delta x_{d}=0.015 =15\times10^{-3}\ m$

$\Delta x_{d}=15\ mm$

Hence, The distance between the places where the intensity is zero due to the double slit effect is 15 mm.

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3 years ago

Lila is a track and field athlete. She must complete four laps around a circular track. The track itself is a 400 meter track an

fgiga [73]

Answer: 4.45m/s

Explanation:

I assume we're solving for her speed.

400m x 4 laps = 1600m

1600m / 6 minutes = 266.67m/min

(266.67m/min) x (1 minute/60 seconds) = 4.45m/s

266.67/60 = 4.45m/s

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4 years ago

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