All categories

3 years ago

Use diffusion to tell what happens when you drop a sugar cube into water.

1 answer:

6 0

<span>The molecules in the sugar move from an area of higher concentration to an area of lower concentration in the water.</span>

You might be interested in

8. A boy pulls a 20.0-kg box with a 140-N force at 30° above a horizontal surface. If the coefficient of kinetic friction betwee

LenaWriter [7]

0.280 m is the correct answer

8 0

3 years ago

What is the formula of kinetics?

snow_lady [41]

Answer:

KE = 1/2 mv v^{2}

Explanation:

Sorry if this didn't helped you.

4 0

3 years ago

Suppose you walk 11 m in a direction exactly 24° south of west then you walk 21 m in a direction exactly 39° west of north. 1) H

DENIUS [597]

Answer:

(1) 42.94 m

(2) $16.02^\circ$

Explanation:

Let us first draw a figure, for the given question as below:

In the figure, we assume that the person starts walking from point A to travel 11 m exactly $24^\circ$ south of west to point B and from there, it walks 21 m exactly $39^\circ$ west of north to reach point C.

Let us first write the two displacements in the vector form:

$\vec{AB} = (-11\cos 24^\circ\ \hat{i}-11\sin 24^\circ\ \hat{j})\ m =(-10.05\ \hat{i}-4.47\ \hat{j})\ m\\\vec{BC} = (-21\sin 39^\circ\ \hat{i}+21\cos 39^\circ\ \hat{j})\ m =(-31.22\ \hat{i}+16.32\ \hat{j})\ m$

Now, the vector sum of both these vectors will give us displacement vector from point A to point C.

$\vec{AC}=\vec{AB}+\vec{BC}\\\Rightarrow \vec{AC}=(-10.05\ \hat{i}-4.47\ \hat{j})\ m+(-31.22\ \hat{i}+16.32\ \hat{j})\ m\\\Rightarrow \vec{AC}=(-41.25\ \hat{i}+11.85\ \hat{j})\ m$

Part (1):

the magnitude of the shortest displacement from the starting point A to point the final position C is given by:

$AC=\sqrt{(-41.25)^2+(11.85)^2}\ m= 42.94\ m$

Part (2):

As the vector AC is coordinates lie in the third quadrant of the cartesian vector plane whose angle with the west will be positive in the north direction.

The angle of the shortest line connecting the starting point and the final position measured north of west is given by:

$\theta = \tan^{-1}(\dfrac{11.85}{41.27})\\\Rightarrow \theta = 16.02^\circ$

4 0

3 years ago

what happens when heat is removed from water? the water particles move farther apart. the water changes from a liquid to a gas.

wel

The kinetic energy of the water particles decrease.

6 0

3 years ago

Read 2 more answers

A physics professor claims in court that the reason he went through the red light (λ = 660 nm) was that, due to his motion, the

OlgaM077 [116]

Answer:

the speed is 0.53 10⁸ m / s

Explanation:

As say in the exercise, the Doppler effect must be applied, in this case because it is an electromagnetic radiation with speed 3 10⁸ m/s and nothing can go faster we must use the relativistic Doppler effect

fo = fe √[(c-v) /(c + v)]

Where fo is the observed frequency, fe the emitted frequency, c the speed of light and v the relative speed of the observer and emit, it is positive move away

The light fulfills the relationship

c = λ f

f = c / λ

In this case v is negative since the source and the observer approach

Substituting in the equation

c /λo = c /λe √[ (c + v) / (c-v)]

λo = 510 10⁻⁹ m

λe = 610 10⁻⁹ m

We calculate the speed

(λe/λo)² = (c + v) / (c-v)

(λe /λo)² (c-v) = c + v

v +(λe /λo)² v = (λe /λo)² c -c

v [1 +(λe /λo)²] = c [(λe /λo)²-1]

v = c [(λe /λo)² -1] / [1 +(λe /λo)²]

v = 3 10⁸ [(610/510)² -1] / [1+ (610/510)²]

v = 3 10⁸ [1.43-1] / [1 + 1.43]

v = 0.53 10⁸ m / s

A little more about the speed of light

8 0

3 years ago