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?
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Related Questions
Calcula la cantidad de calor que hay que darle a 0,01 l de mercurio para que su temperatura pase de 10 ºC a 25 ºC. Datos: rho=13,6 g/cm3 ; Ar(Hg)=200,6; C=28,1 J/(mol∙K).
Answers
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
Which statements about the geocentric model are false? Select the two correct answers.
A. It explains why Mars appears to move backward for a few months approximately every two years.
B. It shows the Sun at the center of the solar system.
C. It shows Earth at the center of the solar system.
D. It shows the orbits of the planets as circular.
Answers
Answer:
pretty sure its C
Explanation:
maybe C thats my opinion
Which of the following is not a product of photosynthesis?
A.) Glucose
B.) Carbon Dioxide
C.) Sugars
D.) Oxygen
Answers
Answer:
B
Explanation:
I just learned about it on edge.
How is an equation described if the number of atoms of each element in the products equals the number of atoms of each element in the reactants? a.not spontaneous b.balanced c.an acid-base reaction d.spontaneous
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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.
What are chemical reactions?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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Water molecules are made of slightly positively charged hydrogen atoms and slightly negatively charged oxygen
atoms. Which force keeps water molecules stuck to one another?
Answers
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:
If you spill some water, you can see that they seem to connect together as if they were magnetic.You can put around 20-30 drops of water on average on a penny. This shows that water has better surface tension than other liquids, like oil, that can the penny can only hold around 10-15.Lastly, water bugs (which are kind of like mosquitos) can actually stay on top of the water, because they do not break the surface tension of it.Hope this helps you!
If the player in the attached figure wants to kick the ball as far as possible (the greatest range R), what is the angle he should kick the ball at?
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Explanation: plz let me know if this is right
Which statement is best supported by the information in the chart? Wave Y is moving the fastest. Wave X is moving the fastest. All of the waves are moving at the same speed. All of the waves have the same value of wavelengths per second.
Answers
Answer:
Wave x is moving the fastest.
Explanation:
Answer:
Wave x is moving the fastest.
Explanation:
Question 1
4
An object is located 90 m in front of a lens. An image is produced 40 m away from the
lens. What is the focal length of the lens?
O 15.3 m
0.025 m
O 27.7 m
O .011 m
Answers
1/f=1/90m+1/40m
1/f ≈27.7m
anyone pls ASAP it’s so important I will give brainlist or anuthing pls
Answers
1)the length is 10.2
2)the width is 3.25
describe the shape of a screw
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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
!!pls help!! Where does the electricity in your home come from? What types of fuels are used to generate this electricity
Answers
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
a sample of alien goo has a density of 45g/cm^3 and a volume of 10cm^3. What is its mass?
Answers
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
4) Based on your results, what can you infer about the distribution of
touch receptors on the skin?
Answers
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.
Explain the effects of expansion of water on aquatic life
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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.
Which of the following is a result of a limiting factor in an ecosystem?
a. A pond has only produced a small amount of algae, so the fish population is also small.
b. The weather was extra humid last summer and there were more mosquitos than ever before.
c. A farmer planted new grass and months later his animals looked healthier than they’ve looked in years.
d. This year, ticks are supposed to be worse than in previous years, with a huge number of them carrying Lyme Disease.
Answers
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
A ray of light travels through air (n = 1.00) and
approaching the boundary with water (n =
1.33). The angle of incidence is 45.0°.
Determine the angle of refraction.
Answers
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°.
What is Snell's law?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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In 1993, the gold reserves in the United States were about 8.490 × 106
kg. If all
that gold were made into a thick wire with a cross-sectional area of 1cm2
, its
total resistance would be about 6.60 × 102 Ω. If the same operation were
applied to the gold reserves of Germany, France, and Switzerland, the
resistances would be 2.40 × 102 Ω, 2.00 × 102 Ω, and 2.00 × 102 Ω,
respectively. Now consider all four resistors connected as shown in the circuit
diagram below. Find the equivalent resistance.
Answers
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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Does earths Roation causes gravity?
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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 )
You are trying to get a sailboat to land on the shore. Do you think it would it be easier during the day or night and why?
Answers
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
A gas of volume 2 m^3 at 27°C is (a) heated to 327°C, (b) cooled to - 123°C, at constant pressure.What are its new volumes?
Answers
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
A 5kg object is moving downward at a speed of 12m/s. If it is currently 2.6m above the ground, what is its kinetic energy?
Answers
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.
Which energy transformation occurs in plants, allowing them to make food?
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An object has a mass of 10grams and a volume of 20m3. what is the density of the object
Answers
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
The inventor of the electric cell was:
O Coulomb
Franklin
o Gilbert
O Volta
Answers
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
Please help!
A string of length Lis clamped at each end. It CAN'T vibrate with a 1
equal to
Answers
Answer:
4L is the answer
Explanation:
Una carga de 4 nC es transportada desde el suelo hasta la superficie de una esfera cargada con un trabajo de 7 X 10-5 j. Determinar el potencial eléctrico de la esfera
Answers
Respuesta:
2 × 10⁴ V
Explicación:
Paso 1: Información provista
Carga transportada (q): 4 nCTrabajo realizado (W): 7 × 10⁻⁵ JPaso 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
can someone please solve this
Answers
Answer:
The gravity is pulling the diver downwards but the rotation of the body means gravity cant pull him down as quickly
Explanation:
A worker begins pushing a 60-kg crate across the floor with a force of 86N, causing an acceleration of 0.20m/s2 what is the force of friction ?
Answers
How does the motion of the molecules change when you increase the temperature
Answers
Answer:
They speed up as temperature increases.
Explanation:
As temperatures increases within a molecule the particles will speed up.
Brainliest for correct answer :)
An object travelling for 20 seconds initially travels at 10ms-1 and increases its speed to 40ms-1 what is its acceleration?
Answers
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