The symbol of the element Potassium is K, its proton number is 19, its atomic mass is 39, its electron number is 19 and finally Potassium belong to period 4 of the periodic table.
What is an Element?This is defined as a substance cannot be further broken down by any chemical reaction and examples include oxygen, nitrogen etc.
Potassium is an element and has an atomic number of 19 with a mass number of 39 and is present in period 4 in the periodic table.
For all atoms with no charge, the atomic number is equal to the number of proton. The number of proton is also equal to the number of electron which is why they all have the same value of 19.
Neutron = atomic mass - atomic number
= 39 - 19 = 20
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Fez loves team sports and gets abundant exercise through team activities. When Fez engages in team activities such as running or passing the ball, what is happening to Fez’s muscles?
When Fez engages in team activities such as running or passing the ball, they are maintaining tension with an equal force on all sides.
What does tension mean ?Any physical object that is in contact with another one can apply forces to that object. The pulling force transmitted axially by a string, cable, chain, or other similar object, or by each end of a rod, truss member, or other similar three-dimensional object is referred to as tension. The action-reaction pair of forces acting at each end of said elements can also be referred to as tension.
The force produced when a load is applied at one or more of the ends of a material in a direction away from the material's cross-section is known as the tension force. It's common to describe a tension force as a "pulling" force. To exert a tension force on the material, the load must be applied axially.
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Nuclear fusion can release large amounts of energy.
a. true
b. false
Nuclear fusion can release large amounts of energy is the True statement.
What is nuclear fusion?The nuclear fusion reaction occurs when two or more atom combine together to form a heavier atom. For example, when two hydrogen atoms fuse to form one helium atom.
This is the same process that powers the sun and creates huge amounts of energy several times greater than fission. It also doesn't produce highly radioactive fission products.
The nuclear fusion reaction releases large amount of energy, because Fusion reactions have an energy density many times greater than nuclear fission.
The reactions that produces far greater energy per unit of mass but even though the individual fission reactions are generally much more energetic than individual fusion ones, which are themselves millions of times more energetic than chemical reactions.
Thus, the statement is True.
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If the current in a wire is tripled, what effect does this have on the electron drift velocity in the wire?
The effect after the current is tripled is changing the drift velocity by a factor 3.
We need to know about drift velocity of electrons to solve this problem. The drift velocity can be determined as
v = I / (n . A . q)
where v is drift velocity, I is current, n is atom number density, A is surface area and q is the charge.
From the question above, we know that
I2 = 3 . I1
According to drift velocity formula, the drift velocity is proportional to current
v ~ I
Hence, the ratio of drift velocity and current is
v1 / v2 = I1 / I2
substitute the final current (I2)
v1 / v2 = I1 / (3.I1)
v1 / v2 = 1 / 3
v2 = 3v1
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Gay-lussac's law assumes that __________.
a) the temperature is held constant
b) the volume is held constant
c) the number of moles is held constant
Gay-lussac's law assumes that the volume is held constant and the number of moles is held constant.
What is Gay-lussac's law?Gay-Lussac's law states that : The pressure and the temperature of an ideal gas are directly proportional, held mass and volume remains constant.
When the volume is kept as constant, the pressure of a gas will be directly proportional to its temperature.
The law is named after the French physicist and chemist Joseph Gay-Lussac. In 1802, Gay-Lussac formulated this law. It was a formal statement which shows the relationship between temperature and pressure which was described by French physicist, Guillaume Amonton in late 1600’s.
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Rolls of aluminu are 304 mm wide and 0.016mm thick. what maximum length of aluminum foil (in m) can be made from 1.10kg of aluminum? density of al 2.70g/cm'
Aluminum foil can be made to a maximum length of 87.76 meters from 1.10 kg of aluminum.
How do you compute density?Density is defined as d = M/V, where d is density, M is mass, and V is volume.Though the SI unit of density is kg/m3, we use g/cm3 for solids, g/ml for liquids, and g/L for gases for convenience.Density is an important concept because it tells us which substances will float and which will sink when placed in a liquid. Substances float in general if their density is less than the density of the liquid in which they are placed.By using the above formula for density
ρ = mass / volume
⇒ As given in the problem Rolls of aluminum foil are 304 mm wide and 0.016-mm thick.
the mass of the aluminum = 1.10-kg
mass = 1100 grams
the density of the aluminum = 2.70 g/cm3
density = 17/3
⇒ 2.70 g/cm3 = 1100 grams /volume
volume = 1100/ 2.70
=407.40 cm3
volume = width ×thickness ×length
407.40 cm3 = 30.4 ×.0016 ×length
⇒ length = 8375.97 cm
= 87.76 meters
Thus, the maximum length of aluminum foil that can be made from 1.10-kg of aluminum would be 87.76 meters.
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(choose )
Ramy covered a distance 3080 cm on foot. This distance is equivalent to.........
a) 0.03Km + 80cm
b) 0.3Km +8cm
c) 3Km + 8cm
d) 30Km + 80cm
Answer:
a) 0.03km + 80 cm is the right answer
What is the symbol, atomic number, # of protons, # of electrons, atomic mass, rounded atomic mass, # of neutrons (show work), and period of: nitrogen
The symbol of the element Nitrogen is N, its proton number is 7, its atomic mass is 14, its neutron number is 7 and finally Nitrogen belong to period 2 of the periodic table.
What is an Element?This is defined as a substance cannot be further broken down by any chemical reaction and examples include oxygen, nitrogen etc.
Nitrogen is an element and has an atomic number of 7 with a mass number of 14 and is present in period 2 in the periodic table.
For all atoms with no charge, the atomic number is equal to the number of proton. The number of proton is also equal to the number of electron which is why they all have the same value of 7.
Neutron = atomic mass - atomic number
= 14 - 7 = 7
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An artificial channel or large pipe for bringing water from a distance is called a(n):________
Answer:
aqueduct- as opposed to an aquifer which is a geological formation
there was once a crab name mr crabs who had to go to the docter one day . mr crabs is a an animal in the ____ phylum which was not surpising since he has 10 jointed legs
there was once a crab name mr crabs who had to go to the docter one day . mr crabs is a an animal in the arthropods phylum which was not surpising since he has 10 jointed legs
What five classes make up the phylum Arthropoda?Traditional classifications of arthropods place them in the Trilobitomorpha (Trilobites), Chelicerata, Crustacea, Myriapoda, and Hexapoda subphyla.
Arthropod species make up more than 80% of all known extant animal species, with estimates ranging from 170,000 to 5–10 million.
On Earth, arthropods are regarded as the most successful creatures.
Arthropods, however, are also in charge of a number of helpful human functions, including crop pollination, honey production, devouring or parasitizing insect pests, garbage decomposition, and serving as food for various birds, fish, and mammals. Beneficial arthropods flourish in agricultural areas.
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This kind of research allows the researcher to either describe a situation or phenomenon or the relationship between two or more variables without any interference from the proponent.
How are Molecules different from Atoms?
A. They consist of one or more atoms bonded together.
B. They do not contain neutrons.
C. They do not have nuclei.
D. Their particles do not have electrical charges.
ubat
Answer:
A. They consist of one or more atoms bonded together.
Explanation:
Determine the work done in kj in a piston which has a constant pressure of 25 psi its initial volume is 0.3 m^3 while its final vloume
The work done is 51.71 kJ.
We need to know about work done to solve this problem. The work done in compression depends on the pressure and change in volume. It can be determined as
W = P . ΔV
where W is work done, P is pressure and ΔV is change in volume.
From the question above, we know that
P = 25 psi
ΔV = 0.3 m³
Convert the pressure to pascal
25 psi = 172369 Pa
By substituting the given parameter, we can calculate the work done
W = P . ΔV
W = 172369 . 0.3
W = 51710.7 joule
Convert to kj
W = 51710.7 x 10¯³ kJ
W = 51.71 kJ
Hence, the work done is 51.71 kJ
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A jet airliner moving initially at 701 mph to the east where there is no wind moves into a region where the wind is blowing at 848 mph in a direction 13◦ north of east.
What is the new speed of the aircraft with respect to the ground? (b)What is the direction of the aircraft (use coun- terclockwise from due East as the positive an- gular direction, between the limits of −180◦ and +180◦)? HELP WITH PART B
(a) The new speed of the aircraft with respect to the ground is 1,539.13 mph.
(b) The direction of the aircraft is 7⁰ north east.
Resultant speed of the aircraft
The new speed of the air craft is the resultant speed of the aircraft and it is calculated as follows;
R² = A² + B² - 2AB cos(R)
where;
θ is the direction of the air craft measured counter clock wiseSum of the speed in the horizontal directionA = 701 mph + 848 cos(13)
A = 1,527.266 mph
Sum of the speed in the vertical directionB = 848 x sin(13)
B = 190.76 mph
Resultant speedR = √(A² + B²)
R = √[(1,527.66²) + (190.76²)]
R = 1,539.13 mph
Direction of the aircraftθ = arc tan (y/x) = arc tan (B/A)
θ = arc tan (190.76/1527.66)
θ = 7⁰ north east (measured anticlockwise)
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Explain: to steer an airboat, rudders sit behind the fan. When the air passes through the turned rudders, it turns the boat. Use Newton's third law to construct an explanation on how the rudders turn the boat
The explanation on how the rudders turn the boat is by redirecting the fluid which results in an opposite force aiding the motion of the boat.
What is Newton's third law of motion?This law was coined by Isaac Newton and it states that when object X exerts a force on another object Y, the object Y must exert a form of counter force which has the same magnitude but opposite in direction.
In the case of the rudder, it redirects the fluid which then exerts an equal force of the same magnitude and an opposite direction. This thereby results in the motion of the boat and is therefore the most appropriate choice.
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Which type on manometer must take the atmospheric pressure into account to calculate the pressure exerted by a gas?
A closed end manometer is manometer must take the atmospheric pressure into account to calculate the pressure exerted by a gas.
in closed end manometer, the pressure of gas is measured by measuring the height 'h' and there is no use of atmospheric pressure here.
what is manometer?
A manometer could be a device that we utilize to measure the pressure of the pipelines (cab be of gas, water, fluid, etc.) Moreover, it is usually referred to as a U-shaped tube that's filled with a liquid. In this point, to examine what is it and how it works.
Types of manometer
U-Tube Manometer.
Enlarged-Leg Manometer.
Well-Type Manometer.
Inclined-Tube Manometer.
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Would the coefficient vary if you tied the string to a similar object of different masses, but on the same surface? Explain
No. it will not change.
The coefficient varies only with the surface texture and not with the area of contact and mass of the object.Here, the objects are of identical texture as the description states that the objects are similar.Also, it says that they are placed on the same surface.So, the 2 surfaces that are touching do not vary and hence the coefficient remains unchanged.Different masses have nothing to do with the coefficient as mentioned early and it only deals with the change in the maximum possible friction force between the surfaces.This fact can be viewed as follows.[tex]\begin{aligned}f &= \mu R\\R &= mg \cdots (\text{from vertical equilibrium})\\\therefore\,\,\,f &= \mu.mg \\f &= (\mu g). m \cdots(\text{friction varies with mass})\\\end{aligned}[/tex]
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For each method - sometimes used a s heuristic, what is the distance from start to end? (ignore any coloring in the boxes)
Manhattan distance is a popular heuristic function for sliding-tile puzzles. It is calculated by tallying the number of moves along the grid that each tile takes to move away from its intended position.
What is the Manhattan distance heuristic?Manhattan distance is a popular heuristic function for sliding-tile puzzles. It is calculated by tallying the number of moves along the grid that each tile takes to move away from its intended position. The obvious option for a heuristic function is the Euclidean (straight-line) distance, which, as far as we are aware, can never underestimate the distance but might do so if there is a target obstacle to avoid on the way there.
Any problem-solving strategy that employs a practical approach or numerous short cuts in order to provide answers that might not be ideal but are adequate given a constrained timeline or deadline is known as a heuristic, or heuristic technique.
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What do dependent and independent variables mean in science?
Answer:
Independent variable: These are the factors or conditions that you manipulate in an experiment.
Dependent variables: These are the factor that you observe or measure.
What volume of h2 measured at 26 c and 100 kpa will be produced from 3.25g of na?
40.1L volume of h2 gas that is measured at 26 c and 100 kpa will be produced from Na of mass given as 3.25g.
What does pressure unit kPa mean?Kilopascal (kPa), a 1,000-fold increase in the meter-kilogram-second system’s measure of pressure and tension (the International System of Units [SI]).
Blaise Pascal, a French mathematician and scientist, is honored by its name.
How is kPa determined?The formula below can be used to translate kg/cm2 into kPa:
A kPa equals 1000 pascals (Pa)
1 kg/cm2 is equal to 98066.5 pascals (Pa), or kPa value multiplied by 1000 Pa.
Thereafter,
T = 26°C
= 299K
P = 100kPa
P= 100/101.325
=0.986923 atm
mass = 3.25g
Atomic mas of H = 1.00784
molar mass of H2 gas = 2x10.00784
= 2.01568g/mol
mole of H2 in 3.25g = 3.25/2.01568 = 1.612359 mol
This gas provided in the question follows the ideal gas equation, so it can be written as
PV = nRT
⇒ V = nRT/P
= (1.612359x 0.0821x 299) / 0.986929
⇒ V = 40.104473
V = 40.1 L
Thus, the volume of gas was found to be 40.1Liter.
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An object traveling in a straight line accelerates. What will definitely happen due to the acceleration?
• The distance traveled in a certain time will increase.
O The displacement covered in a certain time will decrease.
O The speed of the object will stay constant.
• The velocity of the object will change.
Answer:
The distance traveled in a certain time will increase
Explanation:
I NEED HELP ASAP. I dont understand it
Answer:
I don't have the full details so... Position 1 + Position 2
That's if "0" doesn't count as a position.
Explanation:
"What was the distance traveled" is basically "how much did you travel?"
e.g. Position 1 was 12 miles, and Position 2 was 7. 12 + 7 = 19.
Amy and ellie left school at the same time, but she and ellie arrived at their homes at the same time. compare the girls speeds. use evidence of the distance each girl travels at the time it takes to travel that distance to support your claim. explain your reasoning.
Given that the temperature change observed is 11.5 c when 4.436 g of naoh are added to 150.0 ml of water. what is the heat energy in kj that is produced?
The heat energy in kj that is produced is 7.21kj given that the temperature change observed is 11.5 c when 4.436 g of naoh are added to 150.0 ml of water
It is given that 4.436g is the mass of NaOH. The density and volume of water it has been added to was also given.
We need to convert the water's volume to mass
Density = mass / volume
Thus, mass = density * volume
150.0mL H2O * (1.000 g/mL) = 150.0 g H2O.
Now simply add the two masses: 150g + 4.436g = 154.436g
Q = mcdT
Q = heat added or removed
m = mass of substance = 154.436g
c = specific heat of this solution is 4.06j/g C
dT = change in temperature
Q = 154.436g * 4.06 * 11.5
Q =7,210.62J
Q = 7.21kj
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Imagine that you could build a telescope of any size in your backyard. Ultimately, the smallest angular size that could be resolved by this telescope would be governed by the?.
The blurring effects of the Earth's atmosphere would decide the smallest angular size that this telescope could resolve.
The term "angular size" refers to an object's apparent size as seen from an observer on Earth. The least angular size can be affected by the magnitude of lights received by telescopes, which can be changed by the earth's hazy atmosphere. Telescopes collect and amplify light from distant objects. Earth's atmosphere substantially limits astronomical observations for two basic reasons.
First, not all atmospheric wavelengths are equally transparent, and some wavelength regimes are completely out of range for ground-based telescopes. Therefore, while developing a telescope with a specific angular size, the earth's atmosphere must be considered.
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A baseball goes from zero to 32 m/s in 0.164 s.
What is its average acceleration?
Answer in units of m/s².
Answer: Доброе утро, ответ 5+5="4
Explanation:
1.A ball is thrown vertically upwards with a velocity of 49 m/s. Calculate
(i) the maximum height to which it rises,
(ii) the total time it takes to return to the surface of the earth.
(i) Max height is 122.5 meters.
(ii) Total time is 10 seconds.
A ladybug crawls up the wall, moving 1 meter in 10 seconds. What is the ladybug's average velocity? show your setup, work, signs, and units. Explain your answer.
The average velocity of ladybug crawling up the wall, v = 0.1 m/s.
Equation :To find average velocity using the formula,
v = dx / dt
where,
v is average velocity
dx is distance
dt is time
So, putting the values
We have,
v = 1m / 10s
v = 0.1 m/s
What is average velocity?The difference between the change in position or displacement (x) and the time intervals (t) during which the displacement occurs is known as average velocity. Depending on how the displacement is displaced, the average velocity may be positive or negative. Meters per second (m/s or ms-1) is the standard international unit for average velocity.
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What is the temperature of a 1.59l flask containing 0.175mol of ne at a pressure of 1.09atm?
The temperature of a 1.59l flask containing 0.175mol of Ne at a pressure of 1.09atm is 120.70 K.
How do you find the temperature of the compound?
We know that the ideal gas law uses the formula:
PV = nRT
where,
P is referred as the pressure, which is measured in atmospheres (atm),
V is referred as the volume, which is measured in cubic meter ([tex]m^{3}[/tex]),
T is referred as the temperature, which is measured in kelvin (K),
R is referred as the ideal gas law constant , i.e., 0.0821 atm(L)/mol(K),
n is known as the number of moles (mol).
Given that,
P = 1 atm = 101 325 Pa
1.09 atm = 1.09 atm x 101 325 Pa/atm = 110 444 Pa
n = 0.175 mol
V = 1.59 x 10⁻³ m³
By substituting the values in the ideal gas law formula,
PV = nRT
110 444 Pa x 1.59 x 10⁻³ m³ = 0.175 mol x 8.314 Jmol⁻¹K⁻¹ x T
T = 120.70 K
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What is the magnitude of the electric field e(r) at a distance r>rb from the center of the ball?
The magnitude of the electric field e(r) at a distance r>rb from the center of the ball is [tex]E = p \frac{r_{b}^{3} }{3E_{0} r^{2} }[/tex].
Gauss's law, often referred to as Gauss's flux theorem, is a principle of physics and electromagnetic that establishes a connection between the distribution of electric charge and the consequent electric field.
Applying gauss law,
[tex]E = \frac{q}{E_{0}(4\pi R^{2}) }[/tex]
[tex]q =p(\frac{4}{3} \pi r_{b}^{3} )[/tex]
Now, plugging in the values of [tex]q =p(\frac{4}{3} \pi r_{b}^{3} )[/tex] in the equation: [tex]E = \frac{q}{E_{0}(4\pi R^{2}) }[/tex]
[tex]E = \frac{p(\frac{4}{3}\pi r_{b} ^{3}) }{E_{0}(4\pi R^{2}) }[/tex]
[tex]E = p \frac{r_{b}^{3} }{3E_{0} r^{2} }[/tex]
Therefore, the magnitude of the electric field e(r) at a distance r>rb from the center of the ball is [tex]E = p \frac{r_{b}^{3} }{3E_{0} r^{2} }[/tex].
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What is the thickness of an anti-reflective coating (n = 1.3) that must be put on a lens (n = 1.5) in order to minimize reflection at a wavelength of 550 nanometers?
The thickness of an anti-reflective coating is 96 nm.
Define Wavelength?
The wavelength in waves is defined as the distance between the crests and troughs. It can be calculated in the meter in the SI system. The crest is the upper part of the wave, and the trough is the lower part.
Given that,
The index of the anti-reflective coating is n = 1.3
The wavelength is denoted as λ = 500 nm = 500×[tex]10^{-9}[/tex]m
The expression for interference can be written as
2t = (m+½)λf
m=0 is the minimum reflection order.
λf is referred to as the wavelength of the film.
By substituting the values in the above expression we get,
2t = (m+½)λf
2t = (0+½)λf
t = λf/4 (this will noted as equation 1 for more clarity )
The wavelength of the light in a medium with refractive index can be expressed as
λf = λ/n
By substituting the values in equation1 we get,
t = λf/4
t = (λ/n)/4
t = λ/4n = 500/(4×1.3) = 96 nm.
Therefore , the thickness of an anti-reflective coating is 96nm.
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