Analyze the example of this door knob wheel and axle.
• The radius of the wheel, or in this case the handle, is 4.125 inches.
• The radius of the axle that opens the latch (inside the mechanism) is 0.125 inch. The actual effort force needed to open the door is 2.25 pounds.
The efficiency of this type of door knob is 85%.
Calculate the ideal mechanical advantage of this wheel and axle system when the resistance force is applied to the axle.
Formula, substitute, final answer
Answer:
28
Explanation:
Velocity ratio= Radius of wheel/radius of axle
Radius of wheel= 4.125 inches
Radius of axle= 0.125 inches
Velocity ratio = 4.125/0.125 = 33
Then;
Efficiency = mechanical advantage/velocity ratio × 100
Since the efficiency of the system = 85%
85 = mechanical advantage/33 × 100
Mechanical advantage = 85 × 33/100 = 28
You have a different rock with a volume of 30cm3 and a mass of 60g
Answer:
its 90
Explanation:
because you add the mass together
Calculate the mass (g) of 1.5 moles of Sulfur.
Answer:
48 g S
Explanation:
Step 1: Define
Molar Mass of Sulfur (S) - 32.07 g/mol
Step 2: Use Dimensional Analysis
[tex]1.5 \hspace{3} mol \hspace{3} S(\frac{32.07 \hspace{3} g \hspace{3} S}{1 \hspace{3} mol \hspace{3} S} )[/tex] = 48.105 g S
Step 3: Simplify
We have 2 sig figs.
48.105 g S ≈ 48 g S
which elements always have 11 protons on the periodic table
Answer:
I think sodium it may be wrong soŕry
Answer: sodium,
Explanation:
H3C
CH3
How will the following molecule bond with itself?
A. Dispersion
B. Dipole-dipole
C. Hydrogen bond
Answer:
B. Dipole-dipole
Explanation:
Dipole-dipole is an intermolecular force between polar molecules, where the positive end of one molecule is attracted to the negative end of the second molecule. Polar molecules form dipoles because they contain both electron-rich and electron-deficient regions, thus containing a partial positive pole and a partial negative pole within the same molecule. Examples of molecules that form dipole-dipole interactions include acetone and formaldehyde.
The intermolecular force acting in CH3CH3 is the dispersion forces.
The nature of intermolecular forces between molecules depends on the polarity of the molecules. Nonpolar polar molecules only have weak dispersion forces acting between their molecules.
The molecule CH3CH3 is a nonpolar molecule. Since it is nonpolar, the only intermolecular force acting between its molecules is the weak dispersion forces.
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Which group is a good conductor of heat and electricity?
Answer:
Typically metals.
Explanation:
what’s the empirical and molecular formula for a compound with 20.2% sodium, 37.6% sulfur, 42.2%oxygen and a molar mass of 682.8g/mol?
Answer:
Empirical formula: Na3S4O9
Molecular formula: Na6S8O18
Explanation:
1) To find the empirical formula, which is the simplest whole number ratio of each element that makes up this unknown compound, we first divide the portion of each element by it's respective atomic mass.
Na= 23g/mol, S= 32g/mol, O=16g/mol
Na = 20.2/23 = 0.878mol
S = 37.6/32 = 1.175mol
O = 42.2/16 = 2.638mol
Next, we divide each number of moles by the smallest value (0.878mol)
Na = 0.878/0.878 = 1
S = 1.175/0.878 = 1.34
O = 2.638/0.878 = 3.004
Next, we multiply each decimal fraction by 3 to make it whole no:
Na = 3
S= 4.02 ~ 4
O= 9.012 ~ 9
The simplest ratio between Na, S and O is 3:4:9 hence, the empirical formula is Na3S4O9
2) To get the molecular formula, we use the molecular weight of each element in the empirical ratio, and the overall molar mass of the compound i.e.
Molar mass of compound= 682.8g/mol
molecular weight of Na3S9O4 = (3 x 23g/mol) + (4 x 32 g/mol) + (9 x 16 g/mol)
= 69 + 128 + 144
= 341 g/mol
Hence, (Na3S4O9)n = 682.8g/mol
= (341)n = 682.8
n = 682.8/341
n = 2.002
n~ 2
Hence, molecular formula = (Na3S4O9)2
= Na6S8O18
The empirical and molecular formula are Na₃S₄O₉ and Na₆S₈O₁₈
respectively.
The empirical formula can be gotten by dividing each element by it's
respective atomic mass.
Na= 23g/mol, S= 32g/mol, O=16g/mol
Na = 20.2/23 = 0.878mol
S = 37.6/32 = 1.175mol
O = 42.2/16 = 2.638mol
Then divide each number of moles by the smallest value which in this case is 0.878mol.
Na = 0.878/0.878 = 1
S = 1.175/0.878 = 1.34
O = 2.638/0.878 = 3.004
Next, we multiply each decimal fraction by 3 to make it whole no:
Na = 3
S= 4.02 ~ 4
O= 9.012 ~ 9
The simplest ratio between Na, S and O is 3:4:9 hence, the empirical formula is Na₃S₄O₉
The molecular formula is calculated by multiplying the molecular weight of each element with empirical ratio to get overall molar mass of the compound
Molar mass of compound is given as 682.8g/mol
Molecular weight of Na₃S₉O₄ = (3 x 23g/mol) + (4 x 32 g/mol) + (9 x 16 g/mol)
= 69 + 128 + 144
= 341 g/mol
Hence, (Na3S4O9)n = 682.8g/mol
= (341)n = 682.8
n = 682.8/341
n = 2.002
n~ 2
Hence, molecular formula = (Na₃S₄O₉)²
= Na₆S₈O₁₈
Please make the following calculation and round your
answer to the correct number of significant figures:
103 x 3.327
Answer:
343
Explanation:
What does the symbol Pt mean in a chemical equation in chemistry?
Explanation:
It is mean Platinum .
hope to helped.
A 9.0 g of a mysterious substance was heated from 23.0°C to 85.0°C using 127 J of heat. To identify the substance we need to know the specific heat capacity of it. What is the mysterious substance’s specific heat capacity?
Answer:
0.228 J/g°C
Explanation:
The specific heat capacity, denoted by c, can be calculated using the formula:
Q = m × c × ∆T
Where; Q = amount of heat
m = mass
c = specific heat capacity
∆T = change in temperature
In this question, m = 9.0g, Q = 127J, T1 = 23°C, T2 = 85°C
Using, Q = m × c × ∆T
127 = 9 × c × (85-23)
127 = 9 × c × 62
127 = 558c
c = 127/558
c = 0.2275
c = 0.228 J/g°C
What is the speed of a car that travels 600 m in three-sec? *
1800 m/s
0.015 m/s
O 603 m/s
200 m/s
Answer:
20 m/s
Explanation:
Which statement best summarizes the importance of Ernest Rutherford's gold foil experiment?
o It proved that all of John Dalton's postulates were true,
O It verified J. J. Thomson's work on the atomic structure.
It showed that an electron circles a nucleus in a fixed-energy orbit
O It showed that a nucleus occupies a small part of the whole atom.
Answer:
d
Explanation:
Guys please what is the answer of 6y+-2
Answer: 6y-2
Explanation: If it is not equal to something, then it will just be plain old
6y-2. Unless you have to graph it...
What happens to the structure of the protein when the temperature rises above the functional level?
A
denatures
B
increases enzyme function
C
does not disrupt the protein structure
D
protein continues to function as normal
PLEASE HELP ASAP
Answer:
The correct answer is option A
Explanation:
The extreme temperatures lead to the unfolding of a polypeptide chain resulting in a change in composition and generally a loss of function. If the protein working as an enzyme denatures, it will make that protein to lose its enzymatic activity.
Answer:
Denatures
Explanation:proteins are very sensitive to temperature change
As the lauric acid was melting, heat was being added to it but the temperature did not rise. Where did the heat energy go?
During the phase change, when solid melts into liquid, its temperature remains constant as the heat energy is stored as potential energy. Likewise, as heat is added to a liquid, its temperature increases as the molecules, once again, move faster.
Melting is the physical process where solid gets converted to the liquid phase. When lauric acid was melting heat was added to it, but the temperature did not rise as it was used in breaking the intermolecular forces.
What is melting?Melting is categorized as a physical change that is reversible. It involves the transition phase of the matter. Here the solids get converted to liquids.
It is a phase change where the heat is added to the object to undergo physical alterations. The heat energy is stored as potential energy in melting.
This energy and heat are used to break the intermolecular forces present in the matter so that the phase of the matter can be converted from solids to liquids.
Therefore, the heat energy in melting is used to break the forces and bonds.
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Draw a model that compares the arrangement of the subatomic particles of oxygen-16 to another isotope, oxygen-18.
Explanation:
Answer and Explanation:Oxygen-16 and oxygen-18 differ in structure only in that oxygen-18 has two more neutrons in its nucleus than oxygen-16 has.
There are three known stable isotopes of oxygen (8O): 16O, 17O, and 18O. Radioactive isotopes ranging from 11O to 26O have also been characterized, all short-lived.
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What does the measurement 45 N represent in the photograph?
A. The direction of the force
O B. The net force
O C. The magnitude (size) of a force
D. An action force with no opposite
SUBMIT
The measurement 45 N represent the magnitude (size) of a force in photograph. Therefore, option C is correct.
What is the magnitude of a force?The magnitude of the force is the number that represents the force's strength. Assume the force is 10 N in the direction of the east. The direction is indicated by 'towards east,' and the magnitude is indicated by '10'. Magnitude is thus the 'value' or 'amount' of any physical quantity.
The magnitude of force is expressed in mass times length times time squared. The most common metric unit is the newton (N), which is defined as one kilogram times one meter over one second squared.
Thus, option C is correct.
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Sugar is made of carbon, hydrogen, and oxygen atoms. Sugar is
Answer:
Sugar is sucrose or [tex]C_{12} H_{22}O{11}[/tex]
Not sure what yo're looking for... Is it molecular? Solid? Nonsystematically named (sucrose)? C12H22O11?
H2O is a covalent compound why??
Answer:
H2O is a covalent compound because of the oxygen and hydrogen, and because they share electrons to sustain stability. Hope this helps :)
I need help so please help me
Answer:b
Explanation:
I honestly don’t know if this I right but that would be my guess
Why are things like magic, astrology and psychic predictions not considered science?
The things like magic, astrology and psychic predictions not considered science as it only consider on the proves given by the experiments and the theory not on the random predictions.
What is science?The science, any universe of source of knowledge that deals with the physical and chemical world and its processes and that deals with the observations and experimentation with conclusion and results.
The magic is about the secret tricks done by magician and astrology is the observing the space and universe all above the earth and psychic deals with the human psychology.
Therefore, things like magic, astrology and psychic predictions not considered science as it only consider on the proves given by the experiments and the theory not on the random predictions.
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In the vinegar and Salt solution, is it possible there was some other compound that formed on the egg shell instead of the food coloring? Based on what you know about the charge on the egg shell and the ions in the solution, what might have reacted to form a compound on the shell instead of the food coloring?
Answer: Most food dyes are acid dyes, so called because they only work in acidic conditions. The vinegar—a solution of 5 percent acetic acid in water—is there to bring the pH low enough that the dye will actually bind.
Explanation: Brainlest please
Which of the following elements will become positive when they become ions? I. Beryllium (Be) II. Hydrogen (H) III. Oxygen (O) IV. Neon (Ne)
Answer:
ii and iii
Explanation:
Beryllium, Hydrogen and Neon elements will become positive when they become ions. Hence, options I, II and IV are the correct answer.
What is an ion?There are two types of ion:
Cation: When an atom loses electrons, it will form a positive ion known as a cation.
Anion: When an atom gains electrons, it will form a negative ion known as an anion.
Be will become [tex]Be^{+2}[/tex], H will become [tex]H^+[/tex] and Ne will become [tex]Ne^+[/tex]
Hence, options I, II and IV are the correct answer.
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Which electrons are the valence electrons of the atom?
Helpppppppp
Explanation:
electrons in the highest energy orbitals which are able to contribute to Bonding are valence electrons,....... please mark me brainiest
How many electrons would an uncharged atom of nitrogen have
What is the circulatory system?
a. The system that helps you breathe.
b. The system that helps you move.
c. The system that transports blood.
d. The system that sends electrical signals.
Answer:
c
Explanation:
Answer:
C
Explanation:
The respiratory is breathing
The muscular system is the movement
In the same condition, what happens to the net force acting on the rope?
Answer:
Explained below
Explanation:
Newton's law of inertia states that An object at rest will remain continue at rest or if in motion, will continue in motion unless in both cases it is acted upon by a net external force.
Now, If two forces on the rope are equal and opposite forces, then the net force on the rope will be zero and it will not move. Thus,balance force is present in the rope and the rope will remain at rest since the net force is zero or it will continue in motion if already in motion without stopping since net force is zero
However, if the forces are acting in the same direction, it will result in an unbalanced force which means that the net force will be equal to the sum of the two forces and this will result in a stronger force than even the 2 individual forces and consequently it will cause the rope at rest to move, or if the rope is in motion, it will cause it to stop.
1. Matter can be measured in many ways for specific purposes. Which measurement depends on the force of gravity it is not reliable measurement?
A. Mass
B. Weight
C. Volume
D. Temperature
2. A bar of gold occupies a volume of 17.0cm3 and has a mass of 34.5g. What is the density of that bar of gold?
A. 2.1 ml/g
B. 2.0 g/cm3
C. 0.49 g/cm3
D. 0.51 ml/g
3. What volume of copper will weigh exactly 240g and have a density of 10.5g/cm3
A. 0.04g/cm3
B.18.2g
C.22.8g/cm3
D.21.4 cm3
Answer:
1. B- weight
2. B- 2.0g/cm3
3. C- 22.8g/cm3
Explanation:
an atom has 43 protons 55 neutrons and 44 electrons. what is the charge of the atom's nucleus?
If you double the lenght of a wire, how does the resistance of the wire change?
and
If you make a wire twice as thick, how does the resistance of the wire change?
Answer:
If the length of a wire is doubled the resistance is shortened if it is thicker is is more durable due to the electrons having more room to spread out and flow through the wire
I hope this will help you