Answer:
(a) The length at temperature 180°C is 40.070 cm
(b) The length at temperature 90°C is 64.976 inches
(c) L(T, α) = 60·α·T - 9000·α + 60
Explanation:
(a) The given parameters are
The thermal expansion coefficient, α for steel = 1.24 × 10⁻⁵/°C
The initial length of the steel L₀ = 40 cm
The initial temperature, t₀ = 40°C
The length at temperature 180°C = L
Therefore, from the given relation, for change in length, ΔL, we have;
ΔL = α × L₀ × ΔT
The amount the temperature changed ΔT = 180°C - 40°C = 140°C
Therefore, the change in length, ΔL, is found as follows;
ΔL = α × L₀ × ΔT = 1.24 × 10⁻⁵/°C × 40 × 140°C = 0.07 cm
Therefore, L = L₀ + ΔL = 40 + 0.07 = 40.07 cm
The length at temperature 180°C = 40.07 cm
(b) Given that the length at T = 120°C is 65 in., we have;
The temperature at which the new length is sought = 90°C
The amount the temperature changed ΔT = 90°C - 120°C = -30°C
ΔL = α × L₀ × ΔT = 1.24 × 10⁻⁵/°C × 65 × -30°C = -0.024375 inches
The length, L at 90°C is therefore, L = L₀ + ΔL = 65 - 0.024375 = 64.976 in.
The length at temperature 90°C = 64.976 inches
(c) L = L₀ + ΔL = L₀ + α × L₀ × ΔT = L₀ + α × L₀ × (T - T₀)
Therefore;
L = 60 + α × 60 × (T - 150°C)
L = 60 + α × 60 × T - 9000 × α
L(T, α) = 60·α·T - 9000·α + 60
what are different type of plastids explain them?
Answer:
Explanation:
There are 3 types of plastids :-
1) Chloroplasts:- The green plastids which contain chlorophyll pigments for photosynthesis.
2) Chromoplasts:-The coloured plastids for pigment synthesis and storage.
3) Leucoplasts:- The colourless plastids for monoterpene synthesis found in non- photosynthetic parts of the plants.
They are of three types:-
a) Amyloplasts- stores starch.
b) Proteinoplasts- stores proteins.
c) Elaioplasts- stores fats and oils.
The nucleus of a helium atom is identical to: A) a gamma particle B) an alpha particle C) a beta particle D) all of the above
Answer: D. All of the above
Answer:
B. Alpha Particles
Explanation:
P: Have a Nice Day!
2)
A barbecue is being planned for 175 people. The ice cream sandwiches for desert cost $1.68 per dozen. It is
assumed that the average number of sandwiches eaten per person will be 1.25. What will it cost to buy ice cream
sandwiches for the barbecue. Solve the problem by dimensional analysis.
Dimensional analysis is the unitary method that is used to determine the values by multiplication. The cost of the ice cream sandwiches for the barbecue is 367.5 $.
What is dimensional analysis?Dimensional analysis has been defined in maths, physics, and chemistry to solve the problem by multiplying the given numbers to determine the values of the other data. It uses the base quantities to estimate the derived values.
Given,
Number of people at barbecue = 175
Cost of ice cream sandwiches = $1.68 per dozen
The average number of sandwiches per person = 1.25
The cost to buy ice cream sandwiches for the barbecue is estimated by the dimensional analysis as:
12 ice cream sandwiches = $1.68
1.25 ice cream sandwiches = $2.1
If it costs $2.1 for each person then 175 people costs:
$2.1 × 175 = $367.5
Therefore, it will cost 367.5 $ for the barbecue.
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1. Put 0.000 034 into scientific notation.
Answer:
3.4x10 to the power of 5
Explanation:
Answer:
My answer to the question is 3.4×10^-5.
While burning coal and charcoal, you notice that coal releases more heat than charcoal. That means that the... 1. elastic energy 2.gravitational energy 3.chemical potential energy is 1.lower 2. higher in charcoal than in coal
Answer:
3). Chemical potential energy
1). lower in charcoal than in coal.
Explanation:
Chemical potential energy is defined as the energy that can be absorbed or stored in a substance's chemical bonds. It can be released when there is a change in the number of particles of the substance.
As per the question, coal releases more heat than charcoal because 'the chemical potential energy of charcoal is lower than the coal' and hence, the latter would release more heat on burning i.e. the energy that was absorbed in the chemical bonds of the substance. Hence, option 3 and 1 are the correct answers.
ASAP!
A solution is made by dissolving 125 g of sodium chloride in 1.5 kg of water. What is the percent by mass?
Answer:
8.3334%
Explanation:
You have two masses. To find the percent of sodium chloride in water by mass, you divide the mass of NaCl by water. First, make both units the same. Easiest is to convert kg into g. 1.5kg = 1500g
125g NaCl/1500g H2O = 0.0833333333 ==> 8.3334%
Which statement best compares and contrasts two physical properties of matter?
Answer:
Answer would be that boiling points and melting points are similar because they both involve the change in a state of a material, but they are different because boiling point involves a change from a liquid to a gas and melting point involves a change from a solid to a liquid. Boiling and melting are phase changes that can happen to a substance however they differ in the process that happens.
Explanation:
Two physical properties of matter can be best compared as boiling points and melting points are similar because both involve the change in a state of matter. But they are different because melting point involves a change from a solid to a liquid and boiling point involves a change from a liquid to a gas.
What are the boiling point and melting point?A boiling point of a liquid can be described as the temperature at which the vapour pressure is equal to the atmospheric pressure of the liquid. The liquid is changed into a vapour at this temperature.
With the addition of heat, the liquid will change into vapour without any increase in temperature. The vapour pressure of the gas increases until it is equal to the pressure of the gas surrounding it. Bubbles are formed within the liquid and rise to the surface.
The melting point of a substance can be described as the temperature at which it transforms the state from solid to liquid. At the melting point, the solid phases and liquid phases exist in equilibrium. The melting point depends on pressure and is generally specified at a standard pressure such as 1 atmosphere.
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Your question is incomplete, but most probably complete question was,
Which statement best compares and contrasts two physical properties of matter?
A) Density and solubility are similar because they both involve water, but they are different because density involves dissolving a material and solubility involves floating or sinking a material. Density and solubility are similar because they both involve a material’s mass and volume, but they are different because density involves floating materials and solubility involves sinking materials.
B) Boiling points and melting points are similar because they both involve changing the heat of a material, but they are different because boiling point involves adding heat to a material and melting point involves removing heat from a material. Boiling points and melting points are similar because they both involve the change in a state of a material, but they are different because boiling point involves a change from a liquid to a gas and melting point involves a change from a solid to a liquid.
Which of the following is a true statement? Smashing an object into many pieces changes its chemical composition. Smashing an object into many pieces is a chemical change. Smashing an object into many pieces does not change the object. Smashing an object into many pieces is a physical change.
Answer:smashing an object into many pieces is a physical change
Explanation:
becauseee i’m not sure i’m getting points
Answer:
smashing an object into many pieces is a physical change
Explanation:
An air mass that originates over land in central america is most likely
Answer: An air mass that originates over land in Central America is most likely warm & dry.
Calculate the mass of a liquid with density of 3.20 g/mL and volume of 15.0 mL.
Answer:
mass = 48 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
Density = 3.20 g/mL
volume = 15.0 mL
Substitute the values into the above formula and solve for the mass
That's
mass = 3.20 × 15
We have the final answer as
mass = 48 gHope this helps you
How does scientists benefit society
Answer:
scientists benefit the society because they prove many theories, plus they are always finding new solutions to new things
Explanation:
Answer:
The scientist uses specialized training to help solve problems
faced by society.
Explanation:
A P E X
Question 2
Which statement describes a change of matter that I DIFFERENT from the others?
A
Peroxide breaking down into water and oxygen
B
Bubbles forming when a pot of water is heated
A pair of jeans soaked in water drying after hanging outside
D
A block of ice decreating in size due to a change in temperature
Answer:
A. Peroxide breaking down into water and oxygen
Explanation:
Generally when it comes to changes, there are physical and chemical changes. In physical changes, there are no new substances been formed, however in chemical change new substances are formed.
A. Peroxide breaking down into water and oxygen
This is a chemical change.
B . Bubbles forming when a pot of water is heated
This is a physical change
C. A pair of jeans soaked in water drying after hanging outside
This is a physical change
D . A block of ice decreasing in size due to a change in temperature
This is a physical change.
Only option A is different from the rest,hence this is the answer.
How can a new element be made?
Answer:
adding or removing protons
Explanation:
Elements are defined by the number of protons they have. If you add or subtract protons then that changes and makes a new element.
Answer:
by changing the number of protons in the nucleus
List 3 common examples of physical changes
Answer: crushing a can, boiling water, breaking a glass
Explanation:
____is used as anode for prevention of corrosion 1 aluminium 2 magnesium 3 iron
Answer:
I'm not sure but I think the answer is Cathodic protection.
If you drop an object with a mass of 3.66 grams and a volume of 4 mL into a beaker containing dish soap, would it float or sink? Dish soap has a density of 0.93 g/mL
Which statement accurately compares the trends in atomic number and atomic mass in the periodic table
the Answer is C
Both the atomic mass and the atomic number increase from left to right.
Answer: is C
Explanation:
Both the atomic mass and the atomic number increase from left to right
How many significant figures are in 10.060 L?
Answer:
5
Explanation:
you have two zeros that are sandwiched in between and one following a signifincant figure after the decimal.
Differences between non-biodegradable and biodegradable.
Answer:
(simple differences)Biodegradable substances are those that degrades or break down naturally...
Non-biodegradable substances are those that do not degrades easily...
Answer:
Biodegradable substances are those that degrades or break down naturally
Non-biodegradable substances are those that do not degrades easily
Scientific predictions can best be described as: a Problems you expect to identify b Questions you expect to ask c Experiments you expect to run d Evidence you expect to find
Answer:
Explanation:a
Scientific predictions are best described as consistent data that are presented in the form of if and then. It is a solution to the problem that may be identified. Thus, option a is correct.
What is scientific prediction?Scientific prediction is a statement that describes the events of the future that are not always correct or incorrect. In scientific research, the experiment is conducted based on the hypothesis to draw conclusions and results that are expected.
The expected results are said to be scientific predictions when they are represented in the form of "if and then" before the analysis of the experimental method and its result are done. It is an account of the events that may possibly take place under specific conditions.
Therefore, option A. scientific prediction is an expected problem.
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A small rock with the mass of 6 g is dropped into a graduated cylinder with 20 mL of water. The water rises to 23 mL. What is the density of the rock?
Answer: The density of the rock is 2g/mL. Hope this helped! :)
Explanation:
V= 3.0mL D=M/V
M= 6.0g
D=6.0g/3.0mL
D= 2.0g/mL
Fill in the blanks below.
1. The equation shows a _________the breaking and forming of chemical bonds that leads to a change in the composition of matter
2. In the equation, CO2 is a________
3. In the equation, C6H1206 is a ___________
4. In O2, the type of bond that holds the two oxygen atoms together is a___________
5. In H2O, the type of bond that holds one of the hydrogen atoms to the oxygen atom is a________
6. The number of oxygen atoms on the left side of the equation is___________ the number of oxygen atoms on the
Chemical equation
right side.
reactant
product
nonpolar
covalent bond
polar
covalent bond
equal to
different from
hydrogen bond
Answer:
Explanation:
6CO₂ + 6 H₂O ⇄ C₆H₁₂0₆ + 6O₂
This is the chemical equation given .
1. The equation shows a __Chemical equation_______the breaking and forming of chemical bonds that leads to a change in the composition of matter.
2. In the equation, CO₂ is a___reactant_____.
3. In the equation, C₆H₁₂0₆ is a ___product________.
4. In O₂, the type of bond that holds the two oxygen atoms together is a_nonpolar_covalent bond_________.
5. In H₂O, the type of bond that holds one of the hydrogen atoms to the oxygen atom is a__polar_hydrogen bond____.
6. The number of oxygen atoms on the left side of the equation is__equal to_________ the number of oxygen atoms on the right side.
she adds 1.5 mL, 0.75 mL, and 1.2 mL. Her measurements of the oil are blank
Answer:
The total measurements of the oil is 3.45mL
Explanation:
Given
1.5 mL, 0.75 mL, and 1.2 mL.
Required
Determine the total
To get the total, we simply add the given volumes together.
[tex]Total = 1.5 mL+ 0.75 mL + 1.2 mL[/tex]
[tex]Total = 3.45mL[/tex]
Hence;
The total measurements of the oil is 3.45mL
why is sodium chloride soluble in water
Answer: because the very polar water molecules attract both the positively charged sodium ions and the negatively charged chloride ions.
A liquid that can absorb and release huge amounts of heat energy without much change in the overall temperature of the water has what
A Has a high density capacity
B Has a high surface tension capacity
C Has a high specific leat capacity
D Has a high non-polar capacity
Answer:
Im pretty sure the answers b
Explanation:
Because if its talking about overall tempature the it means ihas tension with high surface.
A single atom of an element has 11 protons, 11 electrons, and 12 neutrons. Which element is it? a V b Na c Mg d Se
Answer:
B. Na
Explanation:
To identify an atom, you simply need to look at the number of protons. This atom has 11 protons. On the periodic table, you can see that the element with 11 protons is sodium (Na).
need help asp thank you
Answer:
formed at earths surface
Explanation:
so easy
Why do scientists prefer using the Kelvin Scale of temprature?
Probably because they think it is more accurate.
Hope it helps.
An abandoned Indiana coal mine spoil bank (wastes) contains chunks of pyrite minerals. Under constant erosion and weathering, the pyrites leach large amounts of sulfuric acid (H2SO4). The spoil banks are also mixed with large quantities of basic limestone and clay carbonates. What should occur over time?
Answer:
The acid will be neutralized overtime
Explanation:
The presence of the pyrites leads to the leaching of large amounts of sulphuric acid, however the basic carbonates neutralizes the acid according to the reaction equation;
CaCO3 + H2SO4 ---> CaSO4 + CO2 + H2O.
This will prevent all the deleterious consequences associated with the leaching of the acid in the abandoned coal mine.
Put the following elements in order according to the number of protons they contain: S; Si, Sc; Na Reorder answers 1.Si Reorder answers 2.S Reorder answers 3.Sc Reorder answers 4.Na
Answer:
he oxygen ion you have with 8 protons attracting 10 electrons is larger, ... As a result, the 3Al3+ ion will be smaller than the Si element, which has ... O<Al3+<Si<Al<O2-<Ag<Rb<Cs ... It is fairly easy to arrange the atoms according to atomic size. ... I would put it between Al and Ag .
Explanation: