PLS HELP ME!!!
The engine cars that pull high-speed trains usually taper to a point in front, as shown in the illustration. How does this shape change the forces acting on the moving engine car?

Answer:

A. 4 m³

B. 1 m³

Explanation:

A. Determination of the new volume.

Initial Volume (V₁) = 2 m³

Initial temperature (T₁) = 27 °C + 273 = 300 K

Final temperature (T₂) = 327 °C + 273 = 600 K

Final volume (V₂) =?

V₁ / T₁ = V₂ / T₂

2 / 300 = V₂ / 600

Cross multiply

300 × V₂ = 2 × 600

300 × V₂ = 1200

Divide both side by 300

V₂ = 1200 / 300

V₂ = 4 m³

B. Determination of the new volume.

Initial Volume (V₁) = 2 m³

Initial temperature (T₁) = 27 °C + 273 = 300 K

Final temperature (T₂) = –123 °C + 273 = 150 K

Final volume (V₂) =?

V₁ / T₁ = V₂ / T₂

2 / 300 = V₂ / 150

Cross multiply

300 × V₂ = 2 × 150

300 × V₂ = 300

Divide both side by 300

V₂ = 300 / 300

V₂ = 1 m³

Answer:

mass= 4.5 g

Explanation:

density = mass/ volume

given :

density = 45 gm/cm^3

volume = 10cm^3

now

45 = mass / 10

45/10 = mass

mass = 4.5 g

The equivalent resistance of the circuit is 65.98 Ω.

What is Resistor?

A resistor is an electrical component that limits or regulates the flow of electrical current in a circuit. It is designed to provide a specific amount of resistance to the flow of electrons, measured in ohms, and is typically made of a material that can resist the flow of electricity, such as carbon or metal. Resistors are used in a wide range of electronic devices and circuits, from simple LED flashers to complex computer systems.

To find the equivalent resistance of the circuit, we need to use the formula for resistors in parallel:

1/Req = 1/R1 + 1/R2 + 1/R3 + 1/R4

where Req is the equivalent resistance, and R1, R2, R3, and R4 are the resistances of the four resistors.

Substituting the given values, we get:

1/Req = 1/6.60 × 102 + 1/2.40 × 102 + 1/2.00 × 102 + 1/2.00 × 102

1/Req = 0.01515

Req = 65.98 Ω

Therefore, the equivalent resistance of the circuit is 65.98 Ω.

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Answer:

pretty sure its C

Explanation:

maybe C thats my opinion

Answer:

Wave x is moving the fastest.

Explanation:

Answer:

Wave x is moving the fastest.

Explanation:

Respuesta:

2 × 10⁴ V

Explicación:

Paso 1: Información provista

Paso 2: Convertir q a Coulomb

Usaremos el factor de conversión 1 C = 10⁹ nC.

4 nC × 1 C/10⁹ nC = 4 × 10⁻⁹ C

Paso 3: Calcular el potencial eléctrico (V) de la esfera

Usaremos la siguiente fórmula.

V = W/q

V = 7 × 10⁻⁵ J/4 × 10⁻⁹ C = 2 × 10⁴ V

Answer:

Day

Explanation:

Day because the tides wouldn't be as strong

Answer:night

Explanation:

high tide or whichever one is the tide closer to shore

Answer:

32.1176°

Explanation:

In the picture above, I hope that it's a correct answer.

From the Snell's law, the angle of refraction will be 32.117°.

The Snell's law states that the ratio of sine of angle of incidence and angle of refraction is equal to the ratio of refractive index of second medium to the first medium.

sin i/sin r = n(water) / n(air)

r =sin⁻¹ (sin 45 x 1/ 1.33)

r =32.117°

The angle of refraction is 32.117°.

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Respuesta:

286 J

Explicación:

Paso 1: Convertir 0,01 L de Hg a cm³

Usaremos los siguientes factores de conversion.

1 L = 1000 mL

1 mL = 1 cm³

0,01 L × 1000 mL/1 L × 1 cm³/1 mL = 10 cm³

Paso 2: Calcular la masa (m) correspondiente a 10 cm³ de Hg

La densidad de Hg es 13,6 g/cm³.

10 cm³ × 13,6 g/cm³ = 136 g

Paso 3: Calcular los moles(n) correspondientes a 136 g de Hg

La masa molar de Hg es 200,6 g/mol.

136 g × 1 mol/200,6 g = 0,678 mol

Paso 4: Calcular la cantidad de calor requerido (Q)

Usaremos la siguiente fórmula.

Q = c × n × (T₂ - T₁)

donde,

c: calor específico del Hg (28,1 J/mol.K = 28,1 J/mol.K)

T₂ y T₁: temperaturas final e inicial, respectivamente

Q = (28,1 J/mol.°C) × 0,678 mol × (25°C - 10 °C) = 286 J

Answer:

360J

Explanation:

In physics, the kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. The same amount of work is done by the body when decelerating from its current speed to a state of rest.

Answer:

what are the results? Also

Explanation:

The distribution of touch receptors in human skin is not consistent over the body. In humans, touch receptors are less dense in skin covered with any type of hair, such as the arms, legs, torso, and face.  If two points are felt as two separate points, each is in the receptive field of two separate sensory receptors.

Explanation:

density = mass/ volume

in the question the mass is given in grams so will convert it into kg,

10 g = 0.01 kg

density= 0.01/ 20 = 1 / 2000 = 0.005 kg/m^3

Answer:A - a pond has only produced a small amount of algae, so the fish population is also small. i’m pretty sure that’s correct.

Explanation: The amount of alage determines the size,or carrying capasity of the fish population,so it is a limiting factor.

Hope I could help!Brainlist?plz

Answer:

The inventor of the electric cell was:

Alessandro Volta (in other words, Volta)

Explanation:

Answer:

Volta

Hope this helped you!!

Brainliest plsss

Explanation:

Alessandro Volta, in full Conte Alessandro Giuseppe Antonio Anastasio Volta, (born February 18, 1745, Como, Lombardy [Italy]—died March 5, 1827, Como), Italian physicist whose invention of the electric battery provided the first source of continuous current

Answer:

The gravity is pulling the diver downwards but the rotation of the body means gravity cant pull him down as quickly

Explanation:

Answer:

Acceleration a =-1.75 m/s²

Explanation:

Given:

Initial speed u = 24 m/s

Final speed v = 10 m/s

Time taken t = 8 sec

Find:

Acceleration a

Computation:

a = (v-u)/t

a = (10-24)/8

a = -14 / 8

Acceleration a =-1.75 m/s²

Answer:

The anomalous expansion of water helps preserve aquatic life during very cold weather. When temperature falls, the top layer of water in a pond contracts, becomes denser and sinks to the bottom. If the temperature falls further, the top layer expands and remains on the top till it freezes.

Answer: balanced

Explanation: i just took the test! :) hope this helps

In an equation, the number of atoms in products is equal to the number of atoms in reactant represents a balanced equation. Hence, option B is correct.

It is a process in which one or more substance is converted into the other substances, is called chemical reactions. The chemical equation is given as A + B = C + D. A, B are reactants and C, D are products.

There are several types of chemical reactions like balanced reactions, spontaneous reactions, combination reactions and decomposition reactions.

Spontaneous reaction is a chemical reaction, in which the reactant is converted into product without the supply of external energy. The spontaneous reaction exothermic. The example for spontaneous reaction is combustion reaction.

Non-spontaneous reactions is a type of chemical reaction, in which the reactants can not be converted into product by its own. This reaction requires a external energy to undergo the chemical reaction. Electrolysis of water is an example of non-spontaneous reactions.

When there is exchange of one or more hydrogen ions (H⁺) between the reactant and product molecules is called acid-base reactions. This thpe of reaction is called as neutralisation reactions.

Balanced reactions is defined as the number of atoms in reactant is equal to the number of atoms in products. It is also said to be that when there is no inequalities between reactant and product.

Hence, if number of atoms in both reactant and product is equal, then it is called Balanced reactions. Thus, the correct option is B.

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Answer:

B

Explanation:

I just learned about it on edge.

Answer:

he gravity of Earth, denoted by g, is the net acceleration that is imparted to objects due to the combined effect of gravitation (from mass distribution within Earth) and the centrifugal force (from the Earth's rotation )

Answer:

4L is the answer

Explanation:

Answer:

The shape of a screw is a cylindric shape that grows in diameter at the top. Along the cylindar portion, it has horizantal ridges that circulate around the screw.

Hope this helps, brainliest pls :D

Answer:

They speed up as temperature increases.

Explanation:

As temperatures increases within a molecule the particles will speed up.

Answer:

Surface tension.

Explanation:

Water has this thing called surface tension, where the water, most of the time, is hard to split.

A few examples of surface tension in action:

Hope this helps you!

Answer:

Electricity comes from power generation plants (some homes have solar cells which produce most of the electricity

Older plants use coal and gas as fuels for power generation (if you see a train go thru with 100 or so cars loaded with coal, that may be from Wyoming and going to a coal fired plant)

Wind farms are becoming more plentiful and produce some portion of the electricity generated

Solar cell farms are also used to produce a small portion of electricity

Heat pumps can use geothermal sources (heat from the ground)

Wave motion of water can also be used to produce electricity