Answer:
your answer is 11
Explanation:
The mass of water in the kettle is 0.50 kg. The specific heat capacity of water is 4200 J/kg °C. The initial temperature of the water is 100 °C. Calculate the average power output from the water in the kettle to the surroundings in 2 hours
Answer:
1.27 Mega watt approx
Explanation:
Given data
Mass= 0.5kg
c= 4200 J/kg °C
T1= 100°C
Time = 2 hours >>>> 7200 seconds
From the given data the water is already at the boiling point
Hence if continuous heat is being added the latent heat of vapourization will result, the latent heat of vaporization is about 2,260 kJ/kg
Q= mL
Q= 0.5*2,260
Q = 1130kJ
Power= Energy * Time
Power= 1130* 1130
Power= 1.27mega watt approx
Explain why gaps are left between railway lines
Answer:
to prevent the derailing of the train due to thermal expansion.
Answer:
Iron are good conductors of heat and electricity. Being a good conductor it expands as well as contracts with the change of temperature.When heat is applied,they expands because molecules inside the element gets excited and number of molecules inside it increases in tremendous amount,so it leads to expansion of iron. So when the temperature is lowered it comes in its normal state.
The term for this is called as thermal expansion or contraction.The gap in the joint between 2 rails is to prevent from the expansion of the iron. It is necessary ,if not there will be change in structure,it may buckle and chance of derailed is increased.
Explanation:
The gap in the joint between to rails is to compensate for the expansion of the material of rail during summer.
The metals expand or contract with the changes in temperature. The expansion or contraction depends on the coefficient of thermal expansion of the material. Based on this property of the metal, the gap in the joint of two rails is provided.
Describe how different energy stores are changed by the boiler.
[3 marks]
Answer:
Energy can remain in the same store for millions of years or sometimes just for a fraction of a second. There are energy transfers going on all the time - whenever a system changes there is a change in the way some or all of the energy is stored.
Transferring energy
In each of these examples, energy is transferred by one of the following four types of energy transfer:
mechanical work - a force moving an object through a distance
electrical work - charges moving due to a potential difference
heating - due to temperature difference caused electrically or by chemical reaction
radiation - energy tranferred as a wave, eg light and infrared - light radiation and infrared radiation are emitted from the sun
Doing 'work' is the scientific way of saying that energy has been transferred. For example, a grazing cow, a firing catapult and a boiling kettle are all doing 'work', as energy is being transferred.
Energy flow diagrams
Diagrams can be used to show how energy is transferred from one store to another. Two examples are the transfer diagram and the Sankey diagram.
Transfer diagrams
In transfer diagrams the boxes show the energy stores and the arrows show the energy transfers.
For example, a transfer diagram for a child at the top of a slide may be:
Energy transfer diagram of a child on a slide
Gravitational energy stored in the child at the top of the slide is transferred as mechanical work done to speed up and to do work against friction. The result of this is a shift of energy from gravitational potential energy to kinetic energy and internal energy (raising the temperature of the child and the slide).
Sankey diagrams
Sankey diagrams start off as one arrow that splits into two or more points. This shows how all of the energy in a system is transferred into different stores.
Sankey diagram of a child on a slide
Sankey diagrams are really useful when the amount of energy in each of the energy sources is known. The width of the arrow is drawn to scale to show the amount of energy.
Explanation:
!
☻︎
ℍ ꨄ︎
The amount of matter in an object is mass or weight
Answer:
mass
Explanation:
A scientist heats a red powder. Upon heating, a liquid and a gas form.
Which type of substance is the red powder?
O A. anion
B. an isotope
O c. an element
O D. a compound
Answer:
Compound
Explanation:
When the distance between two objects doubles, what happens to the gravitational attraction between these two objects?
Answer:
As indicated by Newton's law of attraction each article or body in the universe draws in every single item towards one another and that power of fascination is straightforwardly relative to the result of their masses and contrarily corresponding to the square of the distance between them.
The power of gravity between two articles will diminish as the distance between them increments. The two most significant elements influencing the gravitational power between two items are their mass and the distance between their focuses. As mass increments, so does the power of gravity, however an increment in distance mirrors a reverse proportionality, which makes that power decline dramatically.
At that point by Newton's All inclusive Law of Attractive energy;
F=GMm/R^2
Mm= result of the majority
R=Distance Between the two masses by focus.
On the off chance that R is multiplied, new force=GMm/(2R)^2
=GMm/4R^2
Unique Power/New Force=4/1
F/4=New Power
why do you think people translate sound waves from compression waves to transverse waves ?
Answer:
Sound waves are translated into transverse waves to know the frequency, amplitude, wavelength etc of the waves.
Explanation:
They translate the sound waves to know the depth about that specific waves and translating it to transverse waves makes it easier.
Hope it helps :D
9. CALCULATE: How much more power is used to move a weight of 500 N a distance of 20 m in 5 s than is used to move a weight of 1,000 N a distance of 30 m in 30 sec?
Answer:
work = 500*3 = 1500 J
1500J in 5 sec = 300 watts
Explanation:
Answer:
it is using the same power
Explanation:
it is using the same power because it has to move longer and a farther distance while the other one has double the power but less the distance
State the Law of Electric Charges in your own words.
[tex] \\ [/tex]
According to Coulomb, the electric force for charges at rest has the following properties: Like charges repel each other; unlike charges attract. Thus, two negative charges repel one another, while a positive charge attracts a negative charge. The attraction or repulsion acts along the line between the two charges.
Things that are negatively charged and things that are positively charged pull on (attract) each other. This makes electrons and protons stick together to form atoms. Things that have the same charge push each other away (they repel each other). This is called the Law of Charges.
[tex] \\ [/tex]
Hope It Helps!
Displacement a combination of
Answer:
Displacement a combination of distance
Explanation:
I'm not sure eh
Can someone help me answer this question what type of rock will form in this type of environment. Pls don’t guess and actually answer it
Answer:
Looks like A but I'm not sure.
Explanation:
dont take my word for it I might be wrong
Answer:
deforestación en el mundo es incontrolable
what is the dimensional formula of thermal conductivity?
Answer:
The dimension of thermal conductivity is M1L1T−3Θ−1, expressed in terms of the dimensions mass (M), length (L), time (T), and temperature (Θ). Other units which are closely related to the thermal conductivity are in common use in the construction and textile industries.
Explanation:looked it up for ya
If it took Mrs. Coleman 1.4 s to go from the 10 m mark to the 15 m mark, what was Mrs. Coleman's average speed?
Answer:
1m every 0.28 seconds
Explanation:
she travelled 5 m in 1.4 s, so divide it by itself, 1.4s divided by 5 m gets you 0.28s for 1m
What is the pressure of the water coming out the bottom of a water tower that is 50 m
high in the air. (Density of water (1000kg/m^3).
Answer:
49,000 Pa
49 kPa
Explanation:
P (pressure)= hρg, where h= height, ρ=density, and g= acceleration due to gravity.
50 m * 1000kg/m³ * 9.8 m/s²
=49,000 kg*m⁻¹s⁻² OR 49,000 Pa OR 49 kPa
PLS HELP WITH THIS DENSITY QUESTIONS AND WHEN SHOWING STEPS PLS USE GRASS
Calculate the density of aluminum if you have a piece of aluminum that has a volume of 48.9 cm³.When the piece is measured it is found to have a mass of 132 g.
A small amount of copper is found to have a mass of 27 g. Calculate the density of copper if the volume of the sample is 3.0 cm³.
The volume of a piece of iron is 65 cm³. If the piece of iron has a mass of 512 g. Calculate the density of the sample of iron.
A stick of cedar wood has a mass of 1.2 kg. It has a volume of 3243 cm³ . What is the density of cedar wood?
Zinc has a density of 7.14 g/cm³. If you are given 50 g of zinc calculate the volume of the sample.
A block of aluminum occupies a volume of 15.0 mL and weighs 40.5 g. What is its density?
Mercury metal is poured into a graduated cylinder that holds exactly 22.5 mL. The mercury used to fill the cylinder weighs 306.0 g. From this Information, calculate the density of mercury.
What volume of silver metal will weigh exactly 2500.0 g. The density of silver is 10.5 g/cm³
Answer:
Explanation:
Density = mass/volume
132g/(48.9 cm³) = 2.7 g/cm³
(27 g)/(3 cm³) = 9 g/cm³
512 g/(65 cm³) = 7.9 g/cm³
1.2 kg/(3243 cm³) cm³ = 1200 g/(3243 cm³) = 0.37 g/cm³
Brad has three beakers of water. Each beaker contains 500 mL of water. The temperature of the water in the first beaker is 40°C. The water in the second beaker is at 100°C, and the water in the third beaker is at 60°C. As part of a lab experiment he will carefully combine the water in all three beakers. He predicts that the combined water will have a final temperature of 50°C.
Evaluate Brad’s claim and clearly state whether he is correct or not. Explain your answer to support your evaluation.
Explanation:
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1. What is the velocity of an 250-kg that has 6,250 J of energy?
Please help
Explanation:
KE = 1/2mv^2
6,250 J =1/2(250kg) v ^2
6250 J = 125kgv^2
125kg. 125kg
v =
[tex] \sqrt{50} [/tex]
need help please and
A. 1 and 2 > 3 and 4 = 4 and 5
B. 1 and 2 > 3 and 4 > 4 and 5
C. 3 and 4 > 4 and 5 > 1 and 2
D. 1 and 2 > 4 and 5 > 3 and 4
E. 3 and 4 = 4 and 5 > 1 and 2
Answer:
1 and 2>3 and 4=4 and 5 that is the answer
The heat from the sun travels to Earth___
A. In high-frequency waves
B.In low frequency-waves
C.Through the movement of molecules
D.By conduction and convention
Answer:
a in high frequency waves
Explanation:
because of the thermal radiation from the sun
Answer:
The answer is B, "In low frequency-waves"
Explanation:
I got this right on my lesson! Have a great day! (-;
two homogeneous bodies of the same volume
Answer:
No, it is not necessary for them to have same mass.
Explanation:
Let both bodies have a density d1 and d2 respectively.
Since their volumes are equal V1 = V2
we know that, https://tex.z-dn.net/?f=%5Cfrac%7Bmass%7D%7Bvolume%7D
Hence, d1 = and d2 =
Taking the ratio of densities,we get
This implies that unless the bodies have same densities, the mass of the two bodies will not be same.
what is the shape of the path traversed by the earth around the sun?
Answer:
The shape of the path transverse by the Earth around the sun is called an ellipse
Explanation:
:)
The body weighing 8kg moves in a straight line uniformly accelerated with an acceleration of 3m / s? on a horizontal surface, under the action of force 60N.Find a) What is the friction force acting on the body) The coefficient of friction between the body and the surface where it moves
Answer:
the friction force f=36
and the coefficient of friction =0.45
Between steel and iron which is more suitable for making permanent magnets electromagnet and magnetic screen give reason for your answer
Answer:
steel is suitable for making permanent magnet
as still has hi factor coercity.
iron is for electromagnet and magnetic screen as iron loses its magnetism as soon as the switch is open and a current is switched off.
Steel is better suitable for making permanent magnets than soft iron since it has higher retentivity and lower coercivity. Compared to soft iron, steel has a lower retentivity and higher coercivity. Compared to soft iron, steel is more resilient and coercive.
What is retentivity and coercivity ?Retentivity : The ability to retain the generated magnetization in a magnetic material when the magnetizing force is removedCoercivity : A measure of the ability of a material to withstand an external magnetic field without becoming demagnetized.What is Permanent magnet and Electromagnet?Permanent magnet : To be suitable for permanent magnet, material should retain its magnetism for longer time, since steel have high retentivity and coercivity . Electromagnet : To be suitable for electromagnet , material should have magnetization and demagnetizing property .
Since , steels have high remanence which means it will remain magnetized even after magnetic field is removed which is not suitable for electromagnetic . iron has high permeability so magnetization is larger and have low retentivity so that material will not retain the magnetic properties . Magnetic screen , Iron has high permeability hence it can shield better than steel
To learn more about retentivity and coercivity
https://brainly.com/question/24130879
#SPJ2
Answer this And you will get The brainiest
Answer:
see below
Explanation:
let one direction be negative and the other direction be positive
so
right = positive
left = negative
up = positive
down = negative
thus
d) -80 + 100 = 20 N
e) 35 - 55 = -20 N
hope this helps, please mark it brainliest
Which pair of element types is most likely to share valence electrons in a
covalent bond?
A. Two metals
B. A metal and a nonmetal
C. Two nonmetals
D. A metal and a metalloid
Answer:
It's C, you guys!!!!
Explanation:
If an object is placed between a convex lens and its focal point, which type of image will be produced?
A.
real, inverted, and magnified
B.
real, upright, and smaller
C.
virtual, inverted, and magnified
D.
virtual, upright, and magnified
E.
real, inverted, and smaller
Answer:
A
Explanation:
Beacuse it has 2 angles
Answer:
b I do believe sorry if I'm wrong
Consider the four masses. Describe the motion of the masses if you used THE SAME amount of force to move each one over THE
SAME time
A)
The greatest mass would not move at all.
B)
All four masses would move the same distance,
The lower the mass, the greater the distance the mass would move,
D)
The greater the mass, the greater the distance the mass would move,
Answer:
option c...................
1. If you were the organizer of this dance event, are you favor in moving the date on May? Why
or why not?
Answer:
I am in favor of the dance event being in may. Because it is nice weather outside, more people will decide to come and spend their time there. It is also light in the evening in may, meaning that you could have the dance event at any time, and younger people will still feel safe at night, meaning their parents will be more open to lwtting kids go.
Why isn't the story of Israel not fully accurate?
Answer:
wait what do you mean? And why is this in physics?
Is this about the iron dome or something biblical?
Explanation:
Answer:
the story of Israel is part of the Bible that's what what you're your lesson is
Explanation: