A dock worker uses a pulley system to raise a boat onto a dock. the pulley system has a mechanical efficiency of 73 %. the boat has a weight of 950 n. the pulley system lifts the boat 5 m into the air. how many newton-metres of work does the dock worker have to exert to lift the boat?
The work (newton-metres) the dock worker have to exert to lift the boat to 5 m in air is 6506.85 Nm
What is work done?This is simply defined as the product of force and distance moved in the direction of the force. Mathematically, it can be expressed as
Workdone (Wd) = force (F) × distance (d)
Wd = Fd
How to determine the output work done Force (F) = 950 NDistance (d) = 5 mOutput work =?Output work = Fd
Output work = 950 × 5
Output work = 4750 Nm
How to determine the input work done Output work = 4750 NmEfficiency = 73%Input work =?Efficiency = (output / input) × 100
73% = 4750 / input
0.73 = 4750 / input
Cross multiply
0.73 × input = 4750
Divide both side by 0.73
Input work = 4750 / 0.73
Input work = 6506.85 Nm
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According to the first law of thermodynamics, what quantity is conserved?.
Answer:
energy
Explanation:
The First Law of Thermodynamics (Conservation) states that energy is conserved, it cannot be created nor destroyed.
This type of intermolecular force relates to the
big difference in the electronegativities. It exists
when N, O or F atom attracts with hydrogen
atom. Medium strength of attraction is
exhibited
The type of intermolecular force relates to the big difference in the electronegativities and is known as hydrogen bonding.
What are intermolecular forces?Intermolecular forces may be defined as the mechanism that mediates the interaction between the atoms of the molecules. It significantly includes the electromagnetic forces of attraction and repulsion between the atoms.
Some examples of intermolecular forces include London-dispersion force, dipole-dipole interaction, van der Waals interaction, hydrogen bonds, etc. Each one of them possesses a different set of characteristic properties distinctly. Some types of forces are also present in the body of living organisms.
Hydrogen bonding is a characteristic kind of interaction that remarkably includes dipole-dipole attraction between the most electronegative elements like Nitrogen, Oxygen, fluorine, etc., and the hydrogen atom.
Therefore, hydrogen bonding is a type of intermolecular force relates to the big difference in the electronegativities.
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#SPJ2
Can someone help me explain three features that make Lake Baikal one of the most unique lakes in the world.
Explanation:
1,it's crystal clear water and unique wild life.
2,It is home to many unique species animals and plants.
3, It's sediment have not been scoured by overriding continental ice sheet
According to the kinetic molecular theory, the molecules of an ideal gas is
Answer:
exert no attractive forces on each other, or on the walls of the container
Explanation:
Carbon 14 decays to Carbon 12 and has a half-life of 5730 years. If a fossil is analysed and it has 5 grams of Carbon 14 and 15 grams of Carbon 12, how old is the fossil?
Answer:
im sorry but this question doesnt make sense
Explanation:
The volume of a gas at 5.0 atm is 3.5 L. What is the volume of the gas at 7.0 atm at the same temperature?
025L
O5.0 L
O10. L
O 12L
Answer:
10 L
Explanation:
Boyle's Law
states that the pressure exerted by a gas (of a given mass, kept at a constant temperature) is inversely proportional to the volume occupied by itP ∝ [tex]\frac{1}{V}[/tex]P₁V₁ = P₂V₂Our values
P₁ = 5 atmV₁ = 3.5 LP₂ = 7 atmUsing the equation
5 x 3.5 = 7 x V₂V₂ = [tex]\frac{35}{3.5}[/tex]V₂ = 10 LAnswer:
0.25L
Explanation:
How many joules are required to eat 5.25 g of titanium from 85.5 celsius to 132.5 celsius
The amount of energy required to eat 5.25 g of Titanium from 85.5 celsius to 132.5 celsius is 129 joules.
How do we calculate required heat?Absorbed or released amount of heat will be calculated by using the below formula as:
Q = mcΔT, where
m = mass of titanium = 5.25g
c = specific heat of titanium = 0.523 J/gram degree celsius
ΔT = change in temperature = 132.5 - 85.5 = 47 degree celsius
On putting these values on the above equation we get,
Q = (5.25)(0.523)(47) = 129 joules
Hence required heat is 129 joules.
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a gas that has a pressure of 7.5 atm and a volume of 20L what would be the new volume if the pressure was changed to 3.5 atm
Answer: 43 L
Explanation:
What are the 10 most important chemical reactions?
Choose ALL correct answers
A.) Combustion of methane (hydrocarbons)
B.) Photosynthesis.
C.) Synthesis of sulfuric acid.
D.) Equilibrium of carbonic acid and carbon dioxide gas.
E.) Biological formation of calcium carbonate.
F.) Rusting of iron.
G.) Production of hydrogen from the action of acid on metal.
H.) Oxidation of alcohol.
I.) Decomposition.
J.) Redox.
Answer:
Combustion of methane (hydrocarbons)
Photosynthesis.
Synthesis of sulfuric acid.
Equilibrium of carbonic acid and carbon dioxide gas.
Biological formation of calcium carbonate.
Rusting of iron.
Production of hydrogen from the action of acid on metal.
Oxidation of alcohol.
Explanation:
how this helps if do mark brainllest pls!!! :)
Can someone please help me? :(
Answer:
A. Each type of cell carries out a specific function for the organism.
Explanation:
[tex]hope[/tex] [tex]this[/tex] [tex]helps![/tex] [tex]:)[/tex]
How many moles of sulfur are in 53.7 grams of sulfur?
Answer:
1.67 moles (find this by dividing 53.7 by the gram formula mass of sulfur, which is about 32.1)
A mutation can be defined as a change in an organism's
transcription.
phenotype.
genotype.
proteins.
Answer:
Genotype
Explanation:
A mutation is the change is DNA, aka the genotype
What amount of alcohol consumed while boating is equivalent to the amount on land.
Answer:
yes it is
Explanation:
while boating or on the land it is the same amount of alcohol
Answer:
Any amount will be have the same effect on Blood Alcohol Content while boating OR on land .
Explanation:
How many hybrid orbitals form when three atomic orbitals of a central atom mix?.
Answer:
three _ _E _ _ _
Explanation:
At constant temperature, a sample of helium at 760. Torr in a closed container was compressed from 5. 00 l to 3. 00 l. What was the new pressure exerted by the helium on its container?.
P₁V₁=P₂V₂
760.5=P₂.3
P₂=1266.6 torr
name the follwing compound, KBr
Answer:
Potassium bromide
Explanation:
Vascular plants have an internal transport system to move water and nutrients throughout the plant. Which of these is used to transport water from the roots to the leaves?
Please help
AB+C<— A+CB
—>
Question 1: Imagine that the reaction starts with 100 molecules of reactants and zero molecules of products. Explain why the amount of reactants will never reach zero.
Question 2: imagine that the reaction starts with 0 molecules of reactants and 100 molecules of products. Will the amount of products increase or decrease as the reaction proceeds? Explain.
The rate of forward reaction equal to the rate of reverse reaction hence the amount of reactants will never reach zero.
Chemical reactionA chemical reaction involves the combnation of two or more species to yiled products. We must know that a point is always reached in a reaction when the rate of forward reaction equal to the rate of reverse reaction hence the amount of reactants will never reach zero.
Also, if the reaction starts with 0 molecules of reactants and 100 molecules of products, the amount of products will decrease overtime.
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Given that the molar mass of naoh is 40.00 g/mol, what mass of naoh is needed to make 2.500 l of a 2.000 m naoh solution? use molarity equals startfraction moles of solute over liters of solution endfraction.. 0.1250 g 5.000 g 32.00 g 200.0 g
The mass of Sodium hydroxide which is needed to make 2.500 L of a 2.000 M NaOH solution is 200 grams.
How do we calculate mass from moles?Mass of any substance will be calculated by using their moles as:
n = W/M, where
W = required mass
M = molar mass
Given that, molarity of NaOH = 2M
Volume of NaOH solution = 2.5L
Moles of NaOH will be calculated by using the below equation as:
M = n/V
n = (2)(2.5) = 5 moles
Now we calculate the mass of NaOH of 5 moles as:
W = (5mol)(40g/mol) = 200g
Hence option (4) is correct.
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Answer:
d
Explanation:
Calculate the molarity of a solution prepared by diluting 7.0 mL of 4.0 M solution to a volume of 30 mL.
Considering the definition of dilution, the molarity of a solution prepared by diluting 7.0 mL of 4.0 M solution to a volume of 30 mL is 0.93 mL.
What is diluionFirst of all, you have to know that when it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.
Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.
In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where
Ci: initial concentrationVi: initial volumeCf: final concentrationVf: final volumeMolarity of the solution in this caseIn this case, you know:
Ci= 4 M Vi= 7 mLCf= ?Vf= 30 mLReplacing in the definition of dilution:
4 M× 7 mL= Cf× 30 mL
Solving:
(4 M× 7 mL)÷ 30 mL= Cf
Cf= 0.93 mL
In summary, the molarity of a solution prepared by diluting 7.0 mL of 4.0 M solution to a volume of 30 mL is 0.93 mL.
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During the degradation of many amino acids, the first step involves transfer of the amino group to which citric acid cycle intermediate?.
PLEASE HELP!!!! WILL MARK BRAINLIEST!!!! A rigid steel container with a volume of 30 L is filled with oxygen to a pressure of 9.00 atm at 28.0 °C. What is the pressure in the container if the temperature is raised to 129.0 °C?
Answer:
12 atm
Explanation:
First, let us convert Celcius into Kelvin: 28.0 °C = 301.15 K and 129.0 °C = 402.15 K
For this question we must employ the Combined Gas Law: [tex]\frac{P_1V_1}{P_2V_2}=\frac{n_1RT_1}{n_2RT_2}[/tex], where [tex]P_1[/tex] is the initial pressure and [tex]P_2[/tex] is the new pressure.
We know that intitially, P=9 atm, V=30 L, and T=301.15K. From our problem, only temperature and pressure changes, while the number of moles, volume and the gas constant, R, stay the same, so they are irrelevant.
Thus, the filled out Combined Gas Law would be:
[tex]\frac{9 atm}{P_2}[/tex]=[tex]\frac{301.15K}{402.15K}[/tex], where the volume, moles of gas, and R are cancelled out.
We can manipulate this equation to derive the new pressure. We find that
9atm≈0.74885[tex]P_2[/tex].
This means that
[tex]P_2[/tex]≈9/0.74885≈12 atm
In the chemical formula h2o, which description explains what the 2 represents?.
H_2O is the chemical formula of compound water.
Here
2 denotes to no of hydrogen atoms as it's after HIn water
There are
2Hydrogen atoms1 Oxygen atoms A lone pair is present over Oxygen atom2)
Molarity is defined as the
A)
moles of solute per liter of solution
B)
moles of solute per kilogram of solvent
volume of a solvent
C)
D)
mass of a solution
Answer:
A.moles of solute per liter of solution
Explanation:
the total number of moles of substances present; mass percentage, the ratio of the mass of the solute to the mass of the solution times 100; parts per thousand (ppt), grams.
:-befrank
Question 4 of 25
How do scientists write very large numbers?
O A. They round off all numbers to a few digits after the decimal.
O B. They express the numbers using scientific notation.
O C. They divide all numbers by a constant to reduce the size.
O D. They simplify the numbers by deleting the exponents.
Answer:
B.
Explanation:
An ion has a charge of +3 and has 51 electrons. How many protons does it have?
Answer:
54 protons
Explanation:
51 electrons 'balance' the charge of 51 protons....but there is three more PLUS charges ......means three more protons
51 + 3 = 54
Which compound has the longest carbon-carbon bond length?.
Hokkaido University researchers have synthesized an organic compound with a longer bond between carbon atoms than ever before - exceeding the assumed limit for carbon-carbon single bond (C-C) lengths. The researchers termed it a "hyper covalent bond." The novel polycyclic hydrocarbon named 10c is stable, and an X-ray analysis showed that its C-C bond lengths was as long as 1.806 angstroms, longer than the previously reported world records for hydrocarbons.
What is the molar mass of a 3.228 g sample of a gas if it occupies 3.21 L at 298 K and 1.25 atm?
Taking into account the ideal gas law and the definition of molar mass, the molar mass of a 3.228 g sample of a gas if it occupies 3.21 L at 298 K and 1.25 atm is 19.66 [tex]\frac{g}{moles}[/tex].
What is ideal gas lawAn ideal gas is a theoretical gas that is considered to be composed of randomly moving point particles that do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.
The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:
P×V = n×R×T
where P is the gas pressure, V is the volume that occupies, T is its temperature, R is the ideal gas constant, and n is the number of moles of the gas. The universal constant of ideal gases R has the same value for all gaseous substances.
Definition of molar massThe molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.
Number of moles in this caseIn this case, you know:
P= 1.25 atmV= 3.21 Ln= ?R= 0.082 [tex]\frac{atmL}{mol K}[/tex]T= 298 KReplacing in the ideal gas law:
1.25 atm× 3.21 L = n× 0.082 [tex]\frac{atmL}{mol K}[/tex]× 298 K
Solving:
n= (1.25 atm× 3.21 L)÷ (0.082 [tex]\frac{atmL}{mol K}[/tex]× 298 K)
n= 0.1642 moles
So, the number of moles in this case are 0.1642 moles.
Molar mass of the sampleIn this case, you know:
mass= 3.228 gnumber of moles= 0.1642 molesThen, considering the definition of molar mass, it is calculated as:
[tex]molar mass=\frac{3.228 g}{0.1642 moles}[/tex]
Solving:
molar mass= 19.66[tex]\frac{g}{moles}[/tex]
Finally, the molar mass of a 3.228 g sample of a gas if it occupies 3.21 L at 298 K and 1.25 atm is 19.66 [tex]\frac{g}{moles}[/tex].
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Molecules are chemically bonded atoms that work as a unit. Should the same kind of molecule be made up of the same kind of elements? Explain your answer
Answer:
Are molecules atoms that are chemically bonded together?
Image result for Molecules are chemically bonded atoms that work as a unit. Should the same kind of molecule be made up of the same kind of elements? Explain your answer
If this interaction is such that the total energy of the system is lowered, then the atoms bond together to form a molecule. Thus, from a structural point of view, a molecule consists of an aggregation of atoms held together by valence forces. Diatomic molecules contain two atoms that are chemically bonded.
Explanation:
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