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3 years ago

GIVING BRAINLIEST PLEASE HELP!!

Physics

2 answers:

Murrr4er [49]3 years ago

7 0

Answer:

A, B, And C,

Explanation:

<em>The law of conservation of energy is a physical law that states energy cannot be created or destroyed but may be changed from one form to another. Another way of stating this law of chemistry is to say the total energy of an isolated system remains constant or is conserved within a given frame of reference. </em>

Kazeer [188]3 years ago

3 0

Answer:

b and d :)

Explanation:

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What is Newton's law of motion

const2013 [10]

Explanation:

Newton’s first law states that, if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force

2nd- is a quantitative description of the changes that a force can produce on the motion of a body.

3rd- states that when two bodies interact, they apply forces to one another that are equal in magnitude and opposite in direction.

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3 years ago

Read 2 more answers

Consider a block of mass m at rest on an inclined plane of angle theta. An acrobat of mass m_A is standing on the top corner of

shtirl [24]

Answer:

μ = tan θ

Explanation:

For this exercise let's use the translational equilibrium condition.

Let's set a datum with the x axis parallel to the plane and the y axis perpendicular to the plane.

Let's break down the weight of the block

sin θ = Wₓ / W

cos θ = W_y / W

Wₓ = W sin θ

W_y = W cos θ

The acrobat is vertically so his weight decomposition is

sin θ = = wₐₓ / wₐ

cos θ = wₐ_y / wₐ

wₐₓ = wₐ sin θ

wₐ_y = wₐ cos θ

let's write the equilibrium equations

Y axis

N- W_y - wₐ_y = 0

N = W cos θ + wₐ cos θ

X axis

Wₓ + wₐ_x - fr = 0

fr = W sin θ + wₐ sin θ

the friction force has the formula

fr = μ N

fr = μ (W cos θ + wₐ cos θ)

we substitute

μ (Mg cos θ + mg cos θ) = Mgsin θ + mg sin θ

μ = $\frac{(M +m) \ sin \ \theta }{(M +m) \ cos \ \theta }$

μ = tan θ

this is the minimum value of the coefficient of static friction for which the system is in equilibrium.

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3 years ago

What is the wavelength of an X-ray photon with energy 8.0 keV (8000 eV)? (1 eV = 1.60 × 10−19 joule.)

katrin2010 [14]

Answer:

Wavelength = 0.15 nm

Frequency = $1939.3939\times 10^{15}Hz$

Explanation:

We have given photon energy E = 8 KeV = 8000 eV

In question it is given that $1eV=1.6\times 10^{-19}J$

So $8000eV=1.6\times 8000\times 10^{-19}=12800\times 10^{-19}j$

Plank's constant $h=6.6\times 10^{-34}js$

We know that photon energy is given by $E=h\nu$

So $12800\times 10^{-19}=6.6\times 10^{-34}\nu$

$\nu =1939.3939\times 10^{15}Hz$

Now wavelength $\lambda =\frac{c}{f}=\frac{3\times 10^8}{1939.3939\times 10^{15}}=0.0015\times 10^{-7}m=0.15nm$

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4 years ago

Everyone is trying to living a perfect life via social media.

Stells [14]

Answer:

wdym?

is this a question?

Explanation:

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3 years ago

One day on her walk home from school, Leann noticed some rust on an old car Leann knows that when iron and oxygen chemically rea

Katena32 [7]

Answer:

reactants

Explanation:

The reaction model is given as shown below:

4Fe + 3O₂ → 2Fe₂O₃

The name that describes the iron and oxygen found on the left hand side of Leann's model is reactants.

Reactants in a chemical expression are the species that are combining together to give a product.

Some reactions only have one reactant and such a chemical process is often termed decomposition reaction.

The two moles of Fe₂O₃ is the product of the reaction.

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3 years ago