The atom with 80 electrons, 126 neutrons, and 82 protons has a nucleus with 82 protons, which means it has 82 electrons to make it electrically neutral. It is also not electrically charged. The name of this atom is lead and its nuclear notation is as follows;`208 Pb 82
The nuclear notation for this nucleus can be written as follows:
The element symbol: Pb
The atomic number (number of protons): 82 (as a subscript)
The mass number (number of protons + neutrons): 126 + 82 = 208 (as a superscript)
Therefore, the nuclear notation for this nucleus is ^208Pb.
`Where `208` is the mass number, `Pb` stands for lead and `82` is the atomic number of lead (Pb). The atomic number represents the number of protons in the nucleus of an atom.
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19. The continuity equation for compressible liquid can be written as
Answer:The continuity equation for a compressible liquid is a mathematical expression that relates the changes in fluid density, velocity, and volume to the changes in time. This equation can be written as:
∂ρ/∂t + (ρv)•∇ = 0
where:
ρ = fluid density
v = fluid velocity
∂/∂t = partial derivative with respect to time
∇ = del operator
The continuity equation expresses the principle of mass conservation, stating that the rate of change of fluid density in a fixed volume must be equal to the rate of flow of fluid into or out of that volume. This equation is commonly used in fluid dynamics to study the behavior of liquids and gases in various applications, such as in pipelines, pumps, valves, and compressors.
Explanation:
A golfer is 40.8 meters away from the green and swings so that the ball has an initial velocity of +20 m/s. Which of the following angled clubs should he use to hit the ball onto the green?
A 15
B 30
C 45
D 70
Answer:
C. 45
Explanation:
Took the quiz and got it right
The angled club that should be use to hit the ball is 45°
The correct answer to the question is Option C. 45
From the question given above, the following data were obtained:
Range (R) = 40.8 m
Initial velocity (u) = 20 m/s
Acceleration due to gravity (g) = 9.8 m/s²
Angle (θ) =?The angle required can be obtained as follow:
\(range = \frac{ {u}^{2} sine 2\theta}{g} \\ \\40.8 = \frac{ {20}^{2}sine 2\theta }{9.8} \\ \\40.8 = \frac{ 400sine 2\theta }{9.8} \\ \\ cross \: multiply \\ \\ 400sine 2\theta = 40.8 \times 9.8 \\ \\ 400sine 2\theta = 399.84 \\ \\ divide \: both \: side \: by \: 400 \\ \\ sine 2\theta = \frac{399.84}{400} \\ \\ sine 2\theta = 1 \\ \\ take \: the \: inverse \: of \: sine \\ \\ 2\theta = {sine}^{ - 1} 1 \\ \\ 2\theta =90 \\ \\ divide \: both \: side \: by \: 2 \\ \\ \theta = \frac{90}{2} \\ \\ \)
θ = 45°Therefore, the angle required is 45°
The correct answer to the question is Option C. 45
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A car accelerates at a rate of 4.00 m/swest for 5.0 seconds. What is the car's change in
velocity?
Answer:
20 m/s
Explanation:
Acceleration = Change in velocity/ time
4 = Change in Velocity/ 5
Change in velocity = 20 m/s
A boy throws a 1 kg rock with a force of 5N. What is the acceleration of the rock when
he lets go of it?
Answer:
5m/s²
Explanation:
mass of the rock = 1kg
Force = 5N
As we know that,
Force= mass*acceleration
Substitute the respective values,
5N = 1kg * a
a = 5N/1kg
a = 5m/s²
And we are done!
90. An uranium nucleus (at rest) undergoes fission and splits into two fragments, one heavy and the other light. Which fragment is moving faster after the fission?
Answer:
Explanation:
No external force is acting on uranium nucleus so we can apply law of conservation of momentum . If M and m be the mass of bigger and smaller fragments respectively and V and v be their velocity after fission , Total momentum after fission = total momentum before fission
MV - mv = 0 , since the nucleus was at rest , its momentum before fission is zero . negative sign of mv is taken because smaller fragment will move in opposite direction to that of bigger fragment .
MV = mv
M / m = v / V
M > m
Hence,
v > V
So velocity of smaller fragment will be higher .
Calculate the velocity of an apple that falls freely from rest and drops for 3.5 seconds.
(brainliest and 100 points)
Answer:
initial velocity(u)=0
time(t)=3.5sec
acceleration (a)=9.8m/s²
final velocity (v)=?
Explanation:
we have
v=u+at=0+9.8×3.5=34.3m/s
Find the magnitude of the torque that acts on the molecule when it is immersed in a uniform electric field of 6.19×105 N/C with its electric dipole vector at an angle of 69.9∘ from the direction of the field.
Answer:
\(\tau=5.81\times 10^5p\ N-m\)
Explanation:
We have,
Electric field, \(E=6.19\times 10^5\ N/C\)
The electric dipole vector at an angle of 69.9 degrees from the direction of the field.
The torque acting on a molecule is given by :
\(\tau=p\times E\\\\\tau=pE\sin\theta\)
p is electric dipole moment
\(\tau=p\times 6.19\times 10^{5}\times \sin (69.9)\\\\\tau=5.81\times 10^5p\ N-m\)
So, the magnitude of the torque acting on the molecule is \(5.81\times 10^5p\ N-m\).
a petrol engine raises 200kg of water in well from a depth of 7m in 6s show that the engine is developed about 2.33 kw of power
Answer:
P = 2.33 kW
Explanation:
Given that,
Mass, m = 200 kg
It is raises in the well from a depth of 7 m in 6 s.
W e know that,
Power = work done/time
Put all the values,
\(P=\dfrac{mgh}{t}\\\\P=\dfrac{200\times 10\times 7}{6}\\\\P=2333.3\ W\)
or
P = 2.33 kW
Hence, the power of the engine is 2.33 kW.
Which object had more potential energy when it was lifted to a distance of 1000 centimeters? Show your calculation.
PLEASE HELP IM OFFERING *15 POINTS*
Explanation:
We Know That
POTENTIAL ENERGY= MASS*g*HEIGHT
When the objects are lifted to same height then the object with heavier mass would have the highest potential energy
.
Suppose that an object is dropped from a height of hy meters and hits the ground with a velocity of v meters per second. Then v 1962 an object is dropped from a height of 269 meters, with what velocity does it hit the ground? Round your answer to the nearest tenth. meters per second
Answer:
The velocity at which it hit the ground is 72.6 meters.
Explanation:
The v1962 an object is dropped from a height of 269 meters.The Kinematic equation for free fall is v² = u² + 2gh.where v is the final velocity, u is the initial velocity, and g is the acceleration due to gravity.So,
h = 269 meters
u = 0 m/s ( 0 for a dropping object )
g = 9.8 m/s²
By Substitute the kinematic equation
v² = u² + 2gh
v² = 0 x 0 + 2 x 9.8 x 269
v² = 0 + 5272.4 => 5272.4
v = √5272.4
v = 72.6
Therefore the object is dropped from a height of 269 meters, it will hit the ground with a velocity of 72.6 meters per second.
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Answer below, only if you know the answer, please. :)
Answer:
c. The smallest part of helium
Water molecule \(\rm (H_2O)\) is not an example of an atom. Two hydrogen atoms (H) bond with one oxygen atom (O) to make the chemical. Therefore, the correct option is A.
The fundamental unit of matter is the atom, which is composed of an electron-orbiting nucleus containing protons and neutrons. It is the smallest, indivisible unit of an element and it still has all of its original chemical properties.
Options B and C, on the other hand, give a detailed description of specific chemical elements such as oxygen and helium, which are examples of atoms. The fundamental building block of an element is an atom, which is made up of an electron-bound nucleus (which consists of protons and neutrons).
Therefore, the correct option is A.
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What are at least 4 different forms of energy that a waterfall has?
LaCie kicks a football from the ground level at a velocity of 13.9 m/s and at angle of 25 degrees to the ground. You have determined that the football would travel 15.1 m before landing. How would this value change if the football was kicked at an angle of 35 degrees? Complete all equations without rounding and then round to the nearest tenth at the end
The ball will travel more distance when projected or kicked at an angle of 35 degrees.
What is the range of projectile?
The range of the projectile or the horizontal distance traveled by the ball is calculated by applying the following kinematic equation as shown below.
R = ( u² sin (2θ ) ) / g
where;
u is the initial velocity of the ballg is the acceleration due to gravityThe horizontal distance traveled by the ball when projected at 35 degrees is calculated as;
R = ( 13.9² x sin ( 2 x 35 ) ) / ( 9.8 )
R = 18.53 m
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write me a presentation of oxygen
Which scientist described an atom made of a solid positively charged substance with electrons dispersed throughout it?.
The scientist that described an atom made a solid positively charged substance with electrons dispersed throughout it was: Ernest Rutherford.
In 1911 Ernest Rutherford proposed his atomic model in which he considered the atom as a positively, densely charged center called a nucleus in which the electrons circulate around the core with a negative charge.
He was responsible for many discoveries in the radioactivity's fields and nuclear physics.
What is an atom?The atom is the smallest part of the composition of matter, it is indivisible and is composed of a nucleus that has protons and neutrons, and around the nucleus there are the electrons.
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A cam is to give the following motion to a knife-edged follower: (i) Outstroke during 80° of
cam rotation; (ii) Dwell for the next 30° of cam rotation; (iii) Return stroke during next 80° of
cam rotation, and (iv) Dwell for the remaining 170° of cam rotation. The stroke of the follower
is 40 mm and the minimum radius of the cam is 40 mm. The follower moves with simple
harmonic motion (SHM) during both the outstroke and return strokes. Draw the displacement
diagram for the same.
Since there is no motion of the follower during this period, the displacement is zero. We are going to use the concept of simple harmonic motion (SHM) .
Given data:
Stroke of the follower = 40mm
Radius of the cam = 40mm
Motion of the cam during the operation: Outstroke during 80° of cam rotation Dwell for the next 30° of cam rotation Return stroke during next 80° of cam rotation Dwell for the remaining 170° of cam rotation Displacement diagram for the same: From the given motion of the follower, it is clear that the follower moves with simple harmonic motion (SHM) during both the outstroke and return strokes. Therefore, the displacement diagram for SHM is as follows: Where,
y = Displacement of the follower
θ = Angular displacement of the cam
A = Amplitude of the motion = 40/2
A = 20 mm (since the stroke of the follower is 40 mm, hence amplitude is 20 mm)
T = Time period of the motion (outstroke and return stroke) = (80 + 80)/360 × 1 rotation
T = 1/2 rotation
T = π (radians) (since 1 rotation = 2π radians)
Therefore, the displacement equation for SHM is:
y = Acos(θ)
This equation is plotted on the y-axis with respect to the angular displacement (θ) of the cam on the x-axis. As per the given data, the cam has four distinct motions. Therefore, we need to plot four displacement diagrams separately:
Outstroke (during 80° of cam rotation):
The displacement diagram for the outstroke is shown below. It is a positive displacement since the follower moves away from the cam. Dwell (for the next 30° of cam rotation):Since there is no motion of the follower during this period, the displacement is zero. Return stroke (during the next 80° of cam rotation):
The displacement diagram for the return stroke is shown below. It is a negative displacement since the follower moves towards the cam. Dwell (for the remaining 170° of cam rotation):Since there is no motion of the follower during this period, the displacement is zero.
Therefore, the displacement diagram for the given motion of the cam with a knife-edged follower moving with simple harmonic motion (SHM) during both the outstroke and return strokes has been drawn.
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A small negatively charged particle formed when an atom gains one or more electrons is called
a(an)
A) cation.
B) nucleus.
C) isotope.
D) anion.
E) proton.
When an atom gains one or more electrons, it becomes negatively charged because electrons are negatively charged particles. This negatively charged particle is called an anion. Anions have a net negative charge and are attracted to positively charged particles such as cations.
Cations, on the other hand, are formed when an atom loses one or more electrons and becomes positively charged. This is because electrons carry a negative charge, and when they are lost, the atom has a net positive charge. Cations are attracted to negatively charged particles such as anions.
The nucleus of an atom, which contains positively charged protons and uncharged neutrons, does not have a net negative or positive charge and does not form ions.
Isotopes, meanwhile, are atoms of the same element that have the same number of protons but different numbers of neutrons. They may have different physical and chemical properties but do not necessarily form ions.
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Whats the most useless invention of all time according to you?
Answer:
the ropeless skipping rope and many other
Answer:
Explanation:
The question should be specified.
150 miles per second (245 km/sec). choose the earth movement that best relates to the description
In conclusion, the earth movement that best relates to the description of 150 miles per second (245 km/sec) is unknown or not applicable based on the information provided.
The description states that the movement is 150 miles per second (245 km/sec). To determine the earth movement that best relates to this description, we need to consider the different types of earth movements.
1. Rotation: The earth rotates on its axis, completing one rotation in approximately 24 hours. However, the speed of rotation is much slower than the given rate of 150 miles per second (245 km/sec). Therefore, rotation is not the correct answer.
2. Revolution: The earth revolves around the sun, completing one revolution in approximately 365.25 days. The average speed of the earth's revolution is about 67,000 miles per hour (108,000 km/h). Since the given rate of 150 miles per second (245 km/sec) is much faster than the average speed of revolution, we can conclude that revolution is not the correct answer.
3. Precession: Precession refers to the slow, wobbling motion of the earth's axis. It takes about 26,000 years for the earth to complete one precession cycle. The speed of precession is extremely slow compared to the given rate of 150 miles per second (245 km/sec). Therefore, precession is not the correct answer.
Based on the given rate of 150 miles per second (245 km/sec), none of the above earth movements accurately match the description. It is important to note that the given rate seems unusually high for any known earth movement. It is possible that the given rate may not correspond to any specific earth movement or that there may be an error in the provided information.
In conclusion, the earth movement that best relates to the description of 150 miles per second (245 km/sec) is unknown or not applicable based on the information provided.
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Action-reaction forces are always the same ____ but are in opposite ____
Answer:
Magnitude, direction
Explanation:
Magnitude, direction
what is the speed of a car that travels 25km in 15 minutes?
Answer:
\( \boxed{ \bold{ \huge{ \boxed{ \sf{27.78 \: m/s}}}}}\)Explanation:
Given,
Speed of a car = 25 km
Converting 25 km into m
\( \sf{1km = 1000m}\)
\( \sf{25 \: km = 25 \times 1000m = 25000m}\)
Time taken ( t ) = 15 minutes
Converting minutes into seconds
\( \sf{1 \: minutes = 60 \: seconds}\)
\( \sf{15 \: minutes = 15 \times 60 sec = 900 \: seconds}\)
Finding the speed of the car
\( \boxed{ \sf{speed = \frac{distance \: travelled}{time \: taken} }}\)
\( \sf{ = \frac{25000 \: m}{900 \: s} }\)
\( \sf{ = 27.78 \: m/s}\)
Hope I helped!
Best regards!!
I am riding my bike at 25 m/s, I start to slow down at a rate of -4 m/s2. I slow down for 5 seconds... what is my final velocity?
The final speed of the bike is 5 m/s.
What is velocity?Speed is measured as the ratio of distance to the time in which the distance was covered.
To calculate the final velocity, we use the formula below.
Formula:
v = u+at................ Equation 1
Where:
v = Final velocityu = Initial velocitya = Accelerationt = Time.From the question,
Given:
u = 25 m/sa = -4 m/s²t = 5 secondsSubstitute these values into equation 1
v = 25+(-4×5)v = 25-20v = 5 m/sHence, the final speed of the bike is 5 m/s.
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A skateboarder traveling at 7.0 meters per second rolls to a stop at the top of a ramp in 3.0
seconds. What is the skateboarder's acceleration?
The acceleration of the skateboarder is calculated out to bbe -2.33 m/s^2, when travelled at 7 meters per second.
What is acceleration and how it calculated out to be -2.33 m/s^2?As we have studied earlier also acceleration is the measure of change in velocity per unit time.Here is given the initial velocity 7 m/s , it is coming to a stop at the top of a ramp . And the time is given 3 seconds.Using the equation a = final velocity - initial velocity / time , we get the acceleration to be -2.33 m/s^2.The skateboarder's acceleration when travelled at 7 meters per second rolls to a stop at the top of a ramp in 3 seconds is calculated out to be -2.33 m/s^2.To know more about acceleration visit:
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Two tanks A and B are connected by a valve. Tank A contains 3.5 kg of CO at 15∘C and 300kPa. Tank B with a volume =4m3
contains N2
at 50∘C and 500kPa. The valve connecting the two tanks is opened, and the two gases form a homogeneous mixture at 25∘C. Determine the final pressure in the Ranks.
The final pressure in the tanks will be determined by the partial pressures of the gases and their respective mole fractions.
When the valve connecting tanks A and B is opened, the CO and N2 gases mix together to form a homogeneous mixture. According to Dalton's Law of Partial Pressures, the total pressure exerted by this mixture is equal to the sum of the partial pressures of each gas. In this case, we need to calculate the partial pressures of CO and N2.
To determine the partial pressures, we first calculate the number of moles of CO and N2 in tanks A and B using the ideal gas law. This involves considering the mass, temperature, and molar mass of each gas. By dividing the number of moles of each gas by the total number of moles in the mixture, we obtain their respective mole fractions.
With the mole fractions in hand, we can calculate the partial pressures of CO and N2 by multiplying their mole fractions by the total pressure in the tanks. Adding these partial pressures together gives us the final pressure in the tanks.
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therbligs are: the smallest unit of time used in methods time measurement exercises. the largest unit of time used in methods time measurement exercises. basic physical elements of motion as used in methods time measurement exercises. the full range of motions required to complete a job as used in methods time measurement exercises. the smallest amount of time required to complete a job.
Therbligs are basic physical elements of motion used in methods time measurement exercises to analyze and measure work processes. They represent the smallest unit of time and the full range of motions required to complete a job.
Therbligs were introduced by Frank B. Gilbreth, an industrial engineer, as a means to analyze and improve work processes. They are used in methods time measurement exercises to break down a task or job into its fundamental motions. Each therblig represents a specific basic physical element of motion, such as grasp, position, release, search, transport, and so on. These elements can be combined in different sequences to represent the full range of motions required to complete a job. Therbligs are used to measure the time required to perform each individual motion, and by summing up the times for all therbligs involved, the total time to complete a job can be determined. By analyzing the therbligs involved in a task, engineers can identify inefficiencies, eliminate unnecessary motions, and streamline work processes to increase productivity and reduce fatigue or strain on workers.
Therefore, therbligs serve as a standardized method for measuring and evaluating work processes, allowing for improvements in efficiency and productivity. They represent both the smallest unit of time used in methods time measurement exercises (individual motions) and the largest unit of time (the full range of motions required to complete a job).
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A freely falling object is dropped from rest after falling for 4 seconds how far has it fallen (m) a.) 4 b.)10 c.) 20 d.) 40 e.) 80 ab.) 200
=======================================================
Explanation:
We'll use the free fall formula, which is,
y = 0.5*g*t^2
where
t = time in secondsg = acceleration of gravity (in m/s^2)y = vertical distance the object has fallen (in meters)In this case,
t = 4 secondsg = 10 m/s^2 approximatelyNote: The freefall assumes the object is not thrown down, and simply dropped (so initial velocity is 0).
So,
y = 0.5*g*t^2
y = 0.5*10*4^2
y = 0.5*10*16
y = 5*16
y = 80
The object has fallen about 80 meters. This value is approximate because g = 10 is approximate. Use g = 9.81 for a more accurate value (though even then this value of g isn't exact either). In this case, your teacher has opted to use g = 10.
Another reason why 80 meters is an approximate value is because we haven't accounted for air resistance. As the object falls through the air, the air particles push up and resist the movement of the falling object, and therefore slow it down. Think of a parachute. For entry level physics courses, you'll ignore air resistance as it greatly complicates the problem. Though it's handy to keep it in mind for later physics courses down the road.
Appliances connected so that they form a single pathway for
charges to flow are connected in a(n)
A. series circuit.
B. parallel circuit.
C. off circuit.
D. open circuit
Appliances connected so that they form a single pathway for charges to flow are connected in a(n)
Answer:A. Series circuit
#CARRYONLEARNING #STUDYWELLAppliances connected so that they create a single pathway for charges to flow are connected in a series circuit. Therefore, option (A) is correct.
What is the resistance of resistors connected in series?In a series combination of appliances, they are connected end-to-end. Consider two resistors, R₁ and R₂ which are connected in a series combination then their effective resistance can be given by:
Total Resistance of the series circuit, R = R₁ + R₂
In a series combination, the current flows through one appliance and then through another appliance. The same current flows through each appliance in one direction. The total voltage of the series circuit is equal to the sum of all the voltage drops across all appliances.
A potential difference of the series circuit, V = V₁ + V₂
Therefore, when appliances are connected in a series circuit they form a single pathway for charges to flow.
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what are the most common finishes applied to aluminum curtain wall componets? what are the advantages of eahc
most common finishes applied to aluminum curtain wall componets is fluoropolymer paint or anodized finish.
what is advantages of finishes ?Anodizing is an electric process that forms a very thick oxide layer with integral color .
An anodized surface is very durable and can be had in many colors , although it is not generally capable of producing very bright colors .
Anodizing is commonly used to improve the corrosion resistance and wear resistance of aluminum parts. It can also provide other desirable benefits, like improved heat dissipation and the ability to accept dyes.
Unlike paints and coatings, anodizing does not apply an external product to the exterior of the aluminum. Instead, an electrochemical process is used to stimulate the naturally-occurring layer of aluminum oxide into growing thicker. This protects the underlying aluminum from its environment, and can even accept dyes. However, the color possibilities for anodizing are not as abundant as in powder coating.
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When you push a shopping cart the friction that is opposing the motion is called _____ friction.
What is the friction used when pushing a shopping cart?
Answer:
Rolling Friction
Explanation:
Friction always acts in the opposite direction to that of the motion of the other object. Meaning, friction slows down the motion of an object by exerting opposing forces on it
The height, h meters, of a soccer ball kicked directly upward can be modeled by the equation h(t)=-4.9t2 + 13.1t+1, where t is the time, in seconds, after the ball was kicked.
The soccer ball is 38/5 or 7.6 meters high after 2 seconds.
How to solve for the heightThe equation you've given is a quadratic function that models the height of the soccer ball over time, considering gravitational pull.
To find the height of the ball after 2 seconds, we substitute t = 2 into the equation:
h(t) = -4.9t² + 13.1t + 1.
Therefore,
h(2) = -4.9*(2)² + 13.12 + 1
= -4.94 + 26.2 + 1
= -19.6 + 26.2 + 1
= 7.6 meters.
So, the soccer ball is 7.6 meters high after 2 seconds.
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The height, h meters, of a soccer ball kicked directly upward can be modeled by the equation h(t)=-4.9t2 + 13.1t+1, where t is the time, in seconds, after the ball was kicked.
How high is the ball after 2 seconds?