help please, I need it

Answer:

a ) 19,536.72 J,

b ) ( About ) 84°C

Explanation:

a ) We can solve this problem assuming that the dishwater remains a constant 78°C the entire duration.

Q = mass of the glass [tex]*[/tex] specific heat of the glass

The mass of the glass is given by 401 g, the specific heat by 840 J / kg [tex]*[/tex] C. Respectively the change in temperature would be the difference between the temperature of the dishwater, and that of the glass. As we want the units in Joules, we need to first convert the 401 g ⇒ kilograms.

401 g = 401 / 1000 kg = 0.401 kg,

Q = 0.401 kg [tex]*[/tex] 840 J / kg 19,536.72 J

b ) We know that the specific heat capacity of water is 4.184 J / g [tex]*[/tex] C. As the final temperature will be common between each substance, we can make their respective heat absorbed, the same. Note that the heat capacity is given in J / g

0.023 kg = 0.023 [tex]*[/tex] 1000 = 23 g,

0.18 kg = 180 g

[tex]- ( 180 )( 4.184 )( x - 93 ) = 23( 4.184 )( x - 14 )[/tex],

[tex]-753.12x+70040.16=96.232x-1347.248[/tex],

[tex]-753.12x=96.232x-71387.408[/tex],

[tex]-849.352x=-71387.408[/tex],

[tex]\frac{-849.352x}{-849.352}=\frac{-71387.408}{-849.352}[/tex],

[tex]x=84.04926\dots[/tex]

The final temperature will be about 84°C

Answer:

30kg-m/s

Explanation:

momentum = mass x velocity

for the question w the coffee cup and the dishwasher: 19,536.72 J

for the question w the 3 pots of boiling water: They all have the same temperature

for the question w the copper: 103.84 Celsius

(Not sure what the other 2 pictures are about but good luck)

Answer:

T = 261 K

T = -12.2°C

Explanation:

PV = nRT

If P and n are constant:

V / T = V / T

2.75 L / (273.15 + 21) K = 2.44 L / T

T = 261 K

T = -12.2°C

A temperature of 20 degree Celsius is equal to 68 degree Fahrenheit temperature. Therefore, option b is correct.

Temperature is a physical unit which measures the overall heat of an object. The SI unit of temperature is Kelvin (K) and the commonly used unit is degree Celsius (°C).

Other unit of temperature is Fahrenheit  (°F). These units can be interconverted between each other with the specific relation between them.

We know that zero degree Celsius is 32  Fahrenheit . Let T be the temperature in degree Celsius,

then, (T° × 9/5) + 32 = T in °F.

Given, temperature = 20 °C.

This temperature can be converted to °F as follows:

(20 °C × 9/5) + 32 = 68 °F.

Therefore, 20 °C is equal to a temperature of 68 °F.

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Answer:

Explanation:

First of all we shall find out net  electric field at q₃ due to both of the remaining charges .

electric field due to charge Q = k Q / r² where k = 9 x 10⁹ Q is amount of charge and r is distance of point

electric field due to charge 105 x 10⁻⁶ C

= 9 x 10⁹ x 105 x 10⁻⁶ / .95²

= 1.047 x 10⁶ N/C  .

It will act away from q₂

electric field due to charge 53 x 10⁻⁶ C

= 9 x 10⁹ x 53 x 10⁻⁶ /( .5+.95)²

= 0.227  x 10⁶ N/C  .

It will act towards   q₁

These fields are in opposite direction so

net field E = 0.82 x 10⁶ N/C.

It will act away from  q₂ .

Force on q₃ due to net field

= q₃ E

= 88 x 10⁻⁶ x 0.82 x 10⁶

= 72.16 N

The direction of this field will be towards q₂ because force on negative charge in a field is always in a direction opposite to the direction of the field.

Answer:

  q₁ = -6.54 10⁻⁵ C

Explanation:

Force is a vector quantity, but since all charges are on the x-axis, we can work in one dimension, let's apply Newton's second law

                F = F₁₂ + F₂₃

the electric force is given by Coulomb's law

                F = k q₁q₂ / r₁₂²

let's write the expression for each force

                F₂₃ = k q₂ q₃ / r₂₃²

                F₂₃ = 9 10⁹ 34.4 10⁻⁶ 72.8 10⁻⁶ / 0.1²

                F₂₃ = 2.25 10³ N

                F₁₂ = k q₁q₂ / r₁₂²

                F₁₂ = 9 10⁹ q₁ 34.4 10⁻⁶ / 0.1²

                F₁₂ = q₁   3,096 10⁷ N

we substitute in the first equation

                225 = q₁  3,096 10⁷ +2.25 10³

                q₁ = (225 - 2.25 10³) / 3,096 10⁷

                q₁ = -6.54 10⁻⁵ C

Answer:

21

Explanation:

Answer:

4

Explanation:

The number 4 that is infront of the CHA(4CHA) means to say that there are 4C 4H and 4A

Tip:the number infront of a equation is call the coefficient

Answer:

It remains the same.

Explanation:

During physical change, the mass, number of atoms and number of molecules will remain the same.

Answer: A

Explanation:

After a chemical change, the total number of atoms of each elements stays the same.

According to the law of conservation of matter "During a chemical reaction, matter is neither created nor destroyed".

This law provides us with a good view into what happens to atoms after a chemical change.

Simply, since we know that atoms are not created nor destroyed, that means their number cannot increase nor decrease.

The simply remain the same.

This is why every chemical equation must be balanced.

Answer: Mechanical waves

Explanation:

Mechanical waves require a medium in order to transport their energy from one location to another. A sound wave is an example of a mechanical wave. Sound waves are incapable of traveling through a vacuum.

Answer:

Mechanical waves

Explanation:

edge 22'

Explanation:

They are;

hope it helps...

Answer:A

Explanation:glass window allow light in but trap the heat inside

Answer:

They are winds that blow in the opposite direction of a normal wind

Explanation:

Answer:

B.) They are winds that blow in the opposite direction of a normal wind.

Explanation:

it's correct trust

Answer:

va = 4.79 m/s

vb = 1.29 m/s

Explanation:

Momentum is conserved:

m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂

(3.00) (0) + (6.50) (3.50) = (3.00) v₁ + (6.50) v₂

22.75 = 3v₁ + 6.5v₂

For an elastic collision, kinetic energy is conserved.

½ m₁u₁² + ½ m₂u₂² = ½ m₁v₁² + ½ m₂v₂²

m₁u₁² + m₂u₂² = m₁v₁² + m₂v₂²

(3.00) (0)² + (6.50) (3.50)² = (3.00) v₁² + (6.50) v₂²

79.625 = 3v₁² + 6.5v₂²

Two equations, two variables.  Solve with substitution:

22.75 = 3v₁ + 6.5v₂

22.75 − 3v₁ = 6.5v₂

v₂ = (22.75 − 3v₁) / 6.5

79.625 = 3v₁² + 6.5v₂²

79.625 = 3v₁² + 6.5 ((22.75 − 3v₁) / 6.5)²

79.625 = 3v₁² + (22.75 − 3v₁)² / 6.5

517.5625 = 19.5v₁² + (22.75 − 3v₁)²

517.5625 = 19.5v₁² + 517.5625 − 136.5v₁ + 9v₁²

0 = 28.5v₁² − 136.5v₁

0 = v₁ (28.5v₁ − 136.5)

v₁ = 0 or 4.79

We know v₁ isn't 0, so v₁ = 4.79 m/s.

Solving for v₂:

v₂ = (22.75 − 3v₁) / 6.5

v₂ = 1.29 m/s

Answer:

The ridge subducts and moves the rock

Explanation:

You got the right answer

Answer: the best times to see it would be from 10 pm to 1 am, meaning when the night skies are dark and clear. The best months to see it would be from April to late August. Whereas the best places in the world to view them would be closer to the arctic circle, this includes Canada, Alaska, Iceland and Greenland.

Explanation:

Hope this helps

Auroras are created by disruptions in the magnetosphere induced by the solar wind. The greatest times to see it are between 10 p.m. and 1 a.m.

Auroras are created by disruptions in the magnetosphere induced by the solar wind. The paths of charged particles in the magnetospheric plasma are altered as a result of these disruptions.

These particles, primarily electrons, and protons fall to the upper atmosphere.

The greatest times to see it are between 10 p.m. and 1 a.m. when the night skies are dark and clear. It is recommended to visit between April and late August.

The greatest spots to see them are closer to the arctic circle, which encompasses Canada, Alaska, Iceland, and Greenland.

Hence the greatest times to see it are between 10 p.m. and 1 a.m.

To learn more about the aurora borealis refer to the link;

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Answer:

red, green, and blue.

Explanation:

The primary colors of light that combine to produce any color within the visible spectrum are red, green, and blue.

Answer:

14 mL

Explanation:

Ideal gas law:

PV = nRT

If n is constant, then:

PV / T = PV / T

(0.819 atm) (17.9 mL) / (273 + 28) K = (0.99 atm) V / (273 + 13) K

V = 14 mL

Answer:

The only liquid elements at standard temperature and pressure are bromine (Br) and mercury (Hg).

Answer:

diagram?

Explanation:

Answer:

-150

Explanation:

I just did it on EDGE2020, and it's 100% correct! Please heart and rate if you found this answer helpful.

Answer:

D The density of methanol must be less than the density of water.

Explanation:

Ice sinks in methanol, so the density of ice is greater than the density of methanol.

Ice floats in water, so the density of ice is less than the density of water.

Since the density of ice is the same in each case, the density of methanol must be less than the density of water.

ρ_methanol < ρ_ice < ρ_water

Answer:

The force of car 3 on car 2 ≈ 1810.82 N

Explanation:

The equation for the change in momentum of the two cars are;

Conservation of linear momentum

150( 2.2 - v) = 265(1.5-v)

150 × 2.2 - 265×1.5 = (150+265)v

150 × 2.2 - 265×1.5 = -67.5 = 415×v

∴ v = -67.5/415 = -0.1627 m/s West = 0.1627 m/s East

The impulse of the net force is the amount of momentum change experienced given by the equation;

Impulse force = [tex]m \times v_f[/tex] - [tex]m \times v_0[/tex]

Where;

[tex]v_f[/tex] = The final velocity

[tex]v_0[/tex] = The initial velocity

For the the 265 kg mass, we have;

[tex]v_f[/tex] = 0.1627 m/s

[tex]v_0[/tex] = 1.5 m/s

Which gives the impulse a s F×Δt =  265×0.1627 - 265×1.5 = -354.38 kg·m/s

The change in kinetic energy of the collision = 1/2×265×(0.1627^2 - 1.5^2) =-294.62 J

Whereby the distance moved in one second is 0.1627 m, we have;

Work done = Force × Distance = Force × 0.1627 = 294.62

Force = 294.62/0.1627 = 1810.82 N.

Answer:

Explanation:

B the oxygen atom becomes strongly positive

and

C HE HYDROGEN ATOM BECOMES PARTIALLY POSITIVE

PLS MARK MY ANSWER AS THE BRANLIEST

Answer:

A

Explanation:

Answer:

The greater the mass of a substance the more thermal energy. The thermal energy of a substance depends on the temperature and mass of that substance.

Explanation:

Answer:

Explanation:

If two objects have the same mass, the object with the higher temperature has greater thermal energy. Temperature affects thermal energy, but temperature isn't the same thing as thermal energy. That's because an object's mass also affects its thermal energy.

Answer:

Resistance can be defined as the potential difference between two points in a circuit, while voltage is the amount of electrons moving through a point in a circuit every second.

Explanation:

Answer:

B and C

Explanation:

The given symbol  [tex]_{-1}^{0}e[/tex] denotes an electron. An electrons has neglecting mass and has one unit of negative charge. Thus, option A is correct.

An electron is a subatomic particle. the other subatomic particles that constitutes an atom are neutrons and  protons. neutrons and protons are located inside the nucleus and electrons are revolving around the nucleus through circular paths of fixed energies.

Electrons are having negative charge and protons are positively charged particles. For an atom the number of protons and electrons are the same. Therefore, an element in its atomic state is neutral.

Neutrons are neutral. However both neutrons and protons are having significant mass compared to an electrons. Hence, the representation of electrons include zero mass and -1 charge. Hence, option A is correct.

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