Answer:
Sodium and water
Explanation:
We are given with the word equation :
sodium + water + sodium hydroxide + hydrogen
It is required to find that the reactants of the above equation.
In terms of chemical formula we can write it as :
[tex]Na+H_2O\rightarrow NaOH+H_2[/tex]
Reactant of a chemical equation are the elements that are present on its LHS. These are the components of which the equation is composed of. So, the reactants of the given equation are sodium and water.
The reactant are :
-Reactants are Sodium and water.
-Hence, option b is correct.
"Reactants"Word equation :sodium + water + sodium hydroxide + hydrogen
In terms of chemical formula ,we can write it as :
[tex]Na+H_2O\rightarrow NaOH+H_2[/tex
Reactants In a chemical equation, reactants are the elements that are present on its LHS(left hand side).
So, the reactants of the given equation are sodium and water.
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1. How much energy is transformed by an electric lamp in 100 s if a current of 0.22 A flows through it when it is connected to a 120 V supply?
2. A 10 V power supply pushes a current of 5.0 A through a resistor. At what rate is energy transferred to the resistor?
3. A tropical fish tank is fitted with an electric heater, which has a power rating of 30 W. The heater is connected to a 12 V supply. What current flows through the heater when it is switched on?
Answer:
1. 2.64 kJ 2. 50 W 3. 2.5 A
Explanation:
1. Energy transformed in the lamp, E = IVt where I = current = 0.22 A, V = voltage = 120 V and t = time = 100s
E = 0.22 A × 120 V × 100 s
= 2640 J
= 2.64 kJ
2. The rate at which energy is trans ferred to the resistor is the power.
Power, P = IV where I = current = 5.0 A and V = voltage = 10 V
P = 5.0 A × 10 V = 50 W
3. Since Power P = IV
Current through the heater I = P/V P = 30 W and V = 12 V
I = 30 W/12 V
= 2.5 A
Rock salt contains sand and salt. A student mixed rock salt in warm water. Describe how the student would separate out the sand, salt and water from the mixture formed
Answer:
Explanation:
First, he can add the rock salt to the water and mix it well. Then he can remove the sand by decantation, after the sand has sedimented. He can seperate the water from the salt by evaporation. He should evaporate the water completely and capture the steam. the steam will cool into water. After evaporating completely, the salt will remain in the container
What is the purpose of using the string to tie the forelegs and hind legs during dissection?
Answer:
To holds the legs apart without rupturing any vein
Explanation:
The purpose of using string to tie the forelegs and hind legs during dissection is to hold the legs apart without rupturing ant vein or artillery for easy dissection procedure( the dismembering of the body of a deceased animal or plant to study its anatomical structure)
when tieing the forelegs and the hind legs the same string is used to tie them and the string is then passed/looped under the dissecting table/tray this way the legs will be held apart and the dissection can commence.
The fisherman steps off a boat, which is in the water, onto a dock. What happens?
A sphere with radius 10 cm is filled with a uniform charge distribution. The magnitude of the electric field at a point 5 cm from the center of the sphere is 3014 N/coul. Use this fact to calculate the charge density rho inside the sphere.
Answer:15 cm
Explanation: u had 10cm. them u had another 5cm
Where would you find the sun on this HR diagram?
A
B
C
D
The Answer Was (A) I Chose It And Got It Correct! I Have Proof For You In The Attachment, Your Welcome! ^_^
Answer:
C
Explanation:
That is where the most heat and light is showing on this diagram.
The sun on this HR diagram is placed at region A. The correct option is A.
What is an HR diagram?
The Hertzsprung-Russell (HR) diagram is a plot of stars that shows their luminosity (or brightness) versus their temperature or spectral type. The HR diagram is divided into several main parts:
Main sequence: This is the prominent diagonal band that extends from the upper left (hot, bright stars) to the lower right (cool, dim stars). The main sequence represents stars that are fusing hydrogen in their cores and is where most stars, including the Sun, spend the majority of their lives.
Giants and supergiants: These are stars that are much larger and more luminous than main-sequence stars, and are found above and to the right of the main sequence. Giants and supergiants are typically older stars that have exhausted the hydrogen fuel in their cores and are in the later stages of their evolution.
White dwarfs: These are the small, dense remnants of stars that have exhausted their nuclear fuel and have shed their outer layers. White dwarfs are found at the lower left of the HR diagram and are the final stage of evolution for stars like the Sun.
Instability strip: This is a narrow region of the HR diagram that includes some of the most variable stars, such as Cepheid variables and RR Lyrae variables. These stars pulsate in size and brightness over a regular period of time, making them useful for measuring distances to other galaxies.
By studying the position of stars on the HR diagram, astronomers can learn about their size, age, temperature, and luminosity, and use this information to develop models of stellar evolution and the history of the universe.
In this question,
The Sun is a main-sequence star, meaning it is in the phase of its life cycle where it is fusing hydrogen in its core to form helium.
On an HR diagram, the Sun falls near the center of the main sequence, which is a diagonal band that extends from the upper left (hot, bright stars) to the lower right (cool, dim stars). The temperature of the Sun is about 5,500°C, which places it in the spectral class G2V.
Therefore, The sun resides in the region of A.
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A jeweler is determining the optical properties of an unknown blue gemstone. She uses an angle of incidence of 62°, and measures an angle of refraction of 30°. Assuming the index of refraction of air is 1.0, what is the index of refraction of the gem?
Answer:
n = 1.76
Explanation:
According to the rule of ( n1 sin theta1 = n2 sin theta2 )
we know both angles so we insert them to the law and apply n1 = 1
so 1/2 = n2 sin 62 and we get the final answer
Answer:
1.77
Explanation:
According to Hooke's law, when the applied force that stretches a spring increase, the extension ( stretching ) will also increase.
TRUE OR FALSE??
Answer:
true
Explanation:
Gravity and magnetism are _ forces.
A. contact
B. field
C. tension
D. normal
Answer:
B. Field
Explanation:
Gravity and Magnetism are defined as non-contact forces, so that eliminates option A.
Tension is found in a rope or a spring, and is a force in itself, so that eliminates option B.
A normal force is one that is perpendicular to the direction of a slope, so that eliminates option D.
A student wishes to make the magnetic force exerted by the electromagnet shown below greater. Which procedure step could the student follow to accomplish this goal?
Answer:
Increase the number of loops in the coil.
Explanation:
Base on the scenario been described in the question, if the student wishes to increase the make the electromagnetic greater, the student should Increase the number of loops in the coil. By so doing, the electromagnetic force will be greater
Carol has several test tubes of different liquids. If Carol removes heat from the liquid substances, which of the following is most likely to occur?
a The temperature of the particles will decrease and then become a gas.
b The temperature of the particles will increase and then become solid.
c The temperature of the particles will increase and then become gases.
d The temperature of the particles will decrease and take up less space.
Answer:
d
Explanation:
Derive velocity-time relation from velocity-time graph
Explanation:
hope this helps you
.....,.......
An electrical device with a resistance of 100 allows a current of 2A to flow through it what is the voltage drop across the device
Answer:
200 Volts
Explanation:
V = I x R
I = 2A
R = 100 Ohms
V = 2 x 100
V = 200
A current flows through a 6
resistor and the potential
difference across the resistor is
15V. What current flows through
the resistor? (don't use any units,
numbers only)
Answer:
2.5 A
Explanation:
Ohms law is a physical law relating the voltage difference between two points, the electric current flowing between them, and the resistance of the path of the current. Mathematically, the law states that V = IR, where V is the voltage difference, I is the current in amperes, and R is the resistance in ohms. It is can easily be deduced from the foregoing that the voltage is directly proportional to current and the resistance is the constant of proportionality.
From ohm's law;
R= 6Ω
V= 15V
I= ???
V=IR
I= V/R
I= 15 V/6Ω
I= 2.5 A
How does the body maintain homeostasis? Give two or more examples of how this is accomplished. Provide supporting details. Be detailed in your answer
Explanation:
-body temp: when cold, erector muscle contract, hair raise, vasoconstriction occurs, sweat production reduces, muscle shiver to enhance metabolism, and thyroid gland secret more thyroxine to enhance metabolism
-water potential balance: when we are thirsty, pituitary gland secret more ADH, kidney tubules become more permeable to water, so more water re-absorbed, less urine produced, retaining more water.
The first device Faraday invented based on Ørsted’s observation was the motor. What did this device do?
Answer:
Faraday’s first device, a motor, used electricity and magnetism to create motion.
Explanation:
just trust me on this one
What is the word used to describe the approach that considers how the different aspects of health
influence each other?
tach files
Answer:
It does not show mountainous regions.
Explanation:
I took the test.
A 5.4-kg ball is thrown into the air with an initial velocity of 35.2 m/s.a
How much kinetic energy does the ball have?
How are sound waves different from the ripples that spread across water?
Answer:
.
Explanation:
Sound waves are caused by vibration ripples in water are caused by disturbance in the molecules
Sound waves are longitudinal (the particles move in the same direction as the wave) as opposed to transversal waves (for example, in a sea wave, the water particles move up and down to form the wave). ... Water being incompressible is one of the reasons why sound waves move much faster in water than ripples.
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What term describes the tendancy of an object to resits change in motion
Answer:
Inertia
Explanation:
Newton's second law of motion states that the accelaration of an object is directly proprotional to the force acting upon it. In symbols, we can write this as
[tex]\mathbf{F}=m\mathbf{a}[/tex]
Wher F is the force acting upon the object, m is the object's mass, and a is the object's acceleration. We can multiply both sides of this equation by 1/m to get the equivalent equation
[tex]\frac{1}{m} \mathbf{F}=\mathbf{a}[/tex]
What happens when we make m higher and higher? Well, that fraction 1/m gets closer and closer to zero. The same force accelarates the object less and less as that object becomes more massive. This consequence of Newton's second law, the resistance of massive objects to changes in acceleration, is called inertia, and it's one of the main expressions of mass in classical mechanics.
How is one second time defined in SI system?
Answer:
The second is defined in terms of a cesium-atom laser and its vibrations.
Explanation:
However, real time is defined in terms of the mean solar day, and it is thus necessary to add leap seconds to the atomic clocks to keep them in line with the astronomical clocks.
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To do work, this truck uses energy stored in chemical fuel and an electrical battery. An illustration of truck with a wide arrow away from it labeled input energy? J and it splits into 3 arrows labeled kinetic energy 400 J, heat 250 J, and friction 150 J. How much total energy does this truck put out? 50 J 250 J 400 J 800 J
I think it may be 800 J.
Answer:
(d)
Explanation:
I took the test
Total energy does this truck put out is 800 joule.
What is energy?Energy is the ability or capability to do tasks, such as the ability to move an item (of a certain mass) by exerting force. Energy can exist in many different forms, including electrical, mechanical, chemical, thermal, or nuclear, and it can change its form.
Given in question energy split into 3 arrows labeled kinetic energy 400 J, heat 250 J, and friction 150 J. Total energy does this truck put out is 800 joule.
Total energy does this truck put out is 800 joule.
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En una barra de 6m que se utiliza como palanca se coloca el fulcro a 2 m de distancia del extremo derecho, como se muestra en la figura. En ese mismo extremo se requiere soportar una carga de 90N. Despreciando el peso de la palanca, determinada Fp, VMI, VMR y la eficiencia del sistema.
Answer:
Fp = 45 N
VMR = 2
VMI = 2
Efficiency = 100%
Explanation:
English Translation
In a 6m bar that is used as a lever, the fulcrum is placed 2m away from the right end, as shown in the figure. At that same end it is required to support a load of 90N. Neglecting lever weight, determined Fp, VMI, VMR and system efficiency
Solution
With the diagram not massively needed to solve this question.
Although, the load of 90 N is placed at the right end of the bar, the fulcrum is placed 2 m from that right end and the balancing force or effort is placed at the extreme most left end of the 6 m bar.
Taking moment about the fulcrum,
The sum of clockwise moments must balance the sum of anti-clockwise moments.
(Load) × (Distance of load from the fulcrum) = (Balancing force) × (Distance of balancing force from fulcrum)
Load = L = 90 N
Distance of load from the fulcrum = 2 m
Balancing force or Effort = Fp = ?
Distance of balancing force from fulcrum = 6 - 2 = 4 m
90 × 2 = Fp × 4
Fp = (180/4) = 45 N
The mechanical advantages are them given as
VMR = (Load)/(Effort) = (90/45) = 2
VMI = (Distance of Effort from the fulcrum)/(Distance of Load from fulcrum) = (4/2) = 2
Efficiency is then given as the VMR divided by VMI in percentage terms
Efficiency = 100% × (VMR/VMI)
Efficiency = 100% × (2/2) = 100%
Hope this Helps!!!
In what year will there be 8 billion people in the world?
2020
2022
2024
2030
Answer:
2030
Explanation:
how do wind, water, and waves cause erosion?
Answer:
Over time
Explanation:
When the waves crash against the rocks (erosion) small bits of rock begin to wear off. Over a lot of years lots of rock would've worn off.
Answer:
when there is high wind e.g hurricane it can cause soil erosion, when there is flood it can cause soil erosion, when there are waves it can wear out the land and cause soil erosion
Explanation:
when there is high wind e.g hurricane it can cause soil erosion, when there is flood it can cause soil erosion, when there are waves it can wear out the land and cause soil erosion
Which formula is used to calculate average velocity?
Va
o v
;
Vave
O V =
Answer:
Vav=total distance/total time
A motorboat starting from rest on a lake accelerates in a straight line at a constant rate of 3.0 m s–2 for 8.0 s. How far does the boat travel during this time
Answer:
96m
Explanation:
Using SUVAT:
s=? u=0 a=3 t=8
s=ut+0.5*at^2
s=0.5*3*8^2
s=96m
Num chuveiro ligado nas posições verão e inverno, com as seguintes características: 220V – 2200W/4400W. Calcule a corrente elétrica que circula na potência menor (verão) e maior (inverno), com a mesma tensão. Dica: isole a corrente elétrica na expressão P= i x U
Explanation:
Let us assume that the question says,"In a shower connected in summer and winter positions, with the following characteristics: 220V - 2200W / 4400W. Calculate the electric current that circulates at the lowest (summer) and highest (winter) power, with the same voltage. Tip: isolate the electric current in the expression P = Ix V "
It is given that,
In a shower connected in summer and winter positions, with the following characteristics: 220 V - 2200 W / 4400 W.
It means lowest power is 2200 W and highest power is 4400 W
For lowest power,
[tex]P=VI[/tex]
I = electric current for summer
[tex]I=\dfrac{P}{V}\\\\I=\dfrac{2200}{220}\\\\I=10\ A[/tex]
For highest power,
[tex]P'=VI'[/tex]
I' = electric current for winters
[tex]I'=\dfrac{P}{V}\\\\I'=\dfrac{4400}{220}\\\\I'=20\ A[/tex]
Which of the following phrases best describes a physical model?
A. An exact copy of an object, system, or process
B. A chemical formula
C. A graph or equation
D. A representation of an object, system, or process
Answer:D a representation of an object system or process
Explanation:
The phrase that best describes a physical model is an exact copy of an object, system or process.
What is meant by a physical model ?A physical model is defined as a model of any object which can be moved or can be held.
Here,
The physical model can be defined as a larger or smaller copy of the object which is to be represented.
The physical models are made for the perfect examination and study of the the physical characteristics of the particular object.
From the above given data,
There is only one example that can be considered as a physical model of a system.
Chemical formula, graph or equation are just a graphical or written representation of a system.
We know that the physical model must be a similar copy of the system,
An exact copy of an object, system or process is an example of physical model.
Hence,
The phrase that best describes a physical model is an exact copy of an object, system or process.
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Is pure water a acid or a base?
Answer:
The pure water is neutral since its PH is 7
Answer:
NEITHER.
Explanation:
it is neutral