Answer:
M-A=N
Explanation:
M-A=N
Here is an example.
The equation above means that the atomic number (A) subtracted from the average atomic mass (M) equals the combined amount of neutrons and protons. Since we know that 35 17Cl is Chlorine (this is because Chlorine (Cl) is the 17th number on the periodic table and has the average atomic mass of 35), we can insert our data into the equation and end up with the following:
35-17=18.
From here, we can tell that we have a mix of neutrons and protons, with the total being 18. Since the atomic number is 17, we can reasonably assume that there are 17 protons and 1 neutron.
But we still need to find the number of electrons. Fortunately, the number of electrons is always equivilant to the number of protons and the atomic mass, so we know that the number of electrons is 17.
So, we have;
17 Protons
1 Neutron
17 Electrons
the diagram shows a ray of light being reflected by a plane mirror and one angle is 60 degrees.what will be the measure of its angle of incidence and angle of reflection?
Answer:
when the light is reflected from a surface the angles of incident is always equal to the angles of reflected where both angles are measures from the path of the light to the normal to the surface at the point at which light stricks the surface . this equality is known as the law of reflection .
Since the angle of reflection is 60 degrees, the angle of incidence is also 60 degrees.
What are the laws of reflection?The laws of reflection describe the behavior of light when it is reflected off a smooth surface, such as a plane mirror. There are two laws of reflection:
1. The angle of incidence is equal to the angle of reflection: When a light ray strikes a surface, the angle between the incoming ray and the surface (the angle of incidence) is equal to the angle between the reflected ray and the surface (the angle of reflection). This law holds true for all angles of incidence.
2. The incident ray, the reflected ray, and the normal to the surface all lie in the same plane: The normal is an imaginary line perpendicular to the surface at the point where the ray strikes the surface. The incident ray is the incoming ray of light, and the reflected ray is the ray that bounces off the surface. Both of these rays, along with the normal, all lie in the same plane.
These laws can be used to predict the path of reflected light and to determine the position and size of an image formed by a plane mirror. The angle of incidence and angle of reflection can be measured using a protractor, and the normal can be found by drawing a line perpendicular to the surface at the point of incidence.
Here in the Question,
According to the law of reflection, the angle of incidence (i) is equal to the angle of reflection (r), which means:
i = r
The angle of incidence = Angle of reflection = 60 degrees.
Therefore, The angle of incidence is also 60 degrees since the angle of reflection is 60 degrees.
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I need the ans for this question QUICK PLEASE!!!
Explanation:
A) 1.05
B) 1.33
C) 1.16
D) 0.62
All units in cm
calculate the pressure of water in a well if the depth of water is 10m
p=d×h×g
p=1000×10×10
:.:p=100000 pa
Explanation:
p=Liquid pressure
d=Density
h=Height
g=acceleration due to gravity
T H A N K Y O U ! !
If a car travels 23.8 meters in 4.2 seconds, what is its speed?
Put your units in the form of a correct abbreviation (example, write s for seconds, m
for meters, or m/s for meters per second).
i need help with this one 2 if you guys don’t mind
The microwave oven was invented in 1945 when some experiments with radar equipment failed and melted some nearby chocolate instead. The scientists realized there were other applications for this energy source. What is an example of.
Answer: Creative Thinking.
Explanation: Creative thinking this is a special ability possessed by individuals to see things differently or I’m a different dimension, and find new ways of solving problems. The fact it’s Creative thinking skills doesnt mean it’s for only 'creative types' like musicians. Everyone can also be a beneficiary of creative thinking from time to time. Just like in the case of the scientist above who saw an invention from his failed experiment.
Answer:
good thinking
Explanation:
gave the person above me brainy
find the area of a body which experiences a pressure of 50000 pa by a force of 100 Newton
Please do it fast
Answer:
Since pressure = force by area
50000 pa = 100N by area
area = 100N by 50000 pa
area = 0.002m²
30. A generation is about one-third of a lifetime. Approximately how many generations have passed since the year 0 AD?
Answer:84 generations
Explanation:
A generation is about one-third of a lifetime. Approximately how many generations have passed since the year 0 AD? Approximately 84 generation.
An atom with the expected number of neutrons, protons, and electrons is called a(n)
Answer:
Stable atom
Explanation:
A stable atom is one that has a balanced nuclear inter-particle force reaction as such the binding energy of a stable atom is sufficient to permanently keep the nucleus as one unit. Examples of a stable atom are the atoms of monoisotopic elements such as fluorine, sodium, iodine, gold, aluminium, and cobalt.
In a stable atom the expected number of proton, neutron, and electron are present while in an unstable atom or radioactive atom, there are more than the expected number of neutrons or protons, such that the internal energy of the nucleus is excessive and more than the binding energy, which can lead to radioactive decay.
a resistance of 30 ohm is placed in a circuit with 90 volt battery what current Flows In the circuit
Answer:
3amperes
Explanation:
current = voltage ÷ resistance = 90÷30= 3amperes
The current Flows In the circuit if, a resistance of 30 ohms is placed in a circuit with a 90-volt battery, is 3 Ampere.
What is resistance?The obstruction to current flow in an electrical circuit is measured by resistance. The Greek letter omega represents the unit of measurement for resistance, known as ohms. Georg Simon Ohm (1784–1854), a German physicist who investigated the connection between voltage, current, and resistance, is the name given to the unit of resistance.
Given:
The resistance of the circuit, R = 30 ohms,
The voltage in the battery, V = 90 volts,
Calculate the current using Ohm law as shown below,
The current of the circuit = The voltage in the battery / The resistance of the circuit,
The current of the circuit = 90 / 30
The current of the circuit = 3 Ampere,
Thus, the current of the circuit having a battery of 90 volts is 3 Ampere.
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Why does the first raindrop decide to drop down to the field?
Answer:
good question lol
Explanation:
The raindrop wants to help in any way it can. The raindrop believes it can water the field by itself.
Answer:
The first raindrop decided to drop down to the field to cheer up the farmer a little bit.
difference between fundamental unit and derived unit (any two)
grade 8 question
Answer:
fundamental units are those units that are independent to other units where as derived units are derived from fundamental units . there are altogether 7 fundamental units where as there are more than seven derived units..
Answer:
[tex] \boxed{ \sf{see \: below}}[/tex]
Explanation:
[tex]\underline{ \sf{fundamental \: unit}}[/tex]
[tex] \star[/tex] This is the unit of a fundamental quantity.
[tex] \star[/tex] This unit is independent of other units.
[tex] \star[/tex] There are only seven fundamental units. They are metre , kilogram , second , Kelvin , ampere , candela and mole.
[tex] \underline{ \sf{derived \: unit}}[/tex]
[tex] \star[/tex] This is the unit of a derived Quantity.
[tex] \star[/tex] This unit is obtained from fundamental units.
[tex] \star[/tex] It is formed in many types using seven fundamental units. They are Newton , Pascal , Joule , Watt , Hertz , Ohm etc.
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How might error analysis help scientists identify and quantify the
causes and effects of uncertainties in measured data? Why is it
important to perform multiple trials in an experiment?
Answer: For producing the error free results of an experiment that identification and quantification of effects of uncertainties are important.
Explanation:
The error analysis is necessary to detect the uncertainties in the measured data or results of the experiment to ensure the validity and acceptability of the results. The errors can be avoided by increasing the precision and accuracy of the measuring instruments. The other factors like changes in the variables of the experiment can also contribute to the errors in the experiment.
It is necessary to perform the multiple trails in an experiment to assure that the results of the experiment are consistent with every trial.
where do we NOT need Robots in society
05. The time required to complete one lap around a perfectly circular track having a radius of 1,835 meters is 86
seconds. What is the car's velocity?
please help!
Answer:
v = 134.06 m/s
Explanation:
Given that,
Radius of a circular track is 1,835 m
Time required to complete one lap around a perfectly circular track is 86 seconds
We need to find the car's velocity. Velocity is equal to,
v=d/t
On circular path,
[tex]v=\dfrac{2\pi r}{t}\\\\v=\dfrac{2\pi \times 1835}{86}\\\\v=134.06\ m/s[/tex]
So, car's velocity is 134.06 m/s.
what do understand by the efficiency of a machine? By using a block and tackel a man can raise a load of 720 N by an effort of 180 N.Find the mechanical advantage of the method.
Answer:
Efficiency of a machine is how well the machine works and what the machine is capable of doing.
Mechanical advantage=Load/Effort.
720/180=4
________________ is a scientific field and job that involves taking our scientific understanding of the natural world and using it to invent, design, and build things to solve problems and achieve practical goals.
Column 1
Column
Civil Engineer
Engineering
KIP
Column
Civil Engineer
Engineering
KIP
Answer:
civil engineering is the correct answer.
a dog walks 12 meters to the west and then 16 meters back to the east
Answer:
Explanation:
4 meters east
Denise heats a beaker of dilute acid on a hot plate in a fume hood. What should Denise wear to best protect herself when she transports the beaker to a balance outside the hood?
Answer:
D . goggles, a lab coat, heat-proof gloves, and close-toed shoes
Explanation:
Answer:
goggles, a lab coat, heat-proof gloves, and close-toed shoes
Explanation:
a student records the feather colors and beak shape of every bird observed in the park. which kind of data is the student recording
Answer:
This question is incomplete. The completed question is below
A student records the feather colors and beak shapes of every bird observation in a park. What kind of data is the student recording? A. Qualitative B. Quantitive C. Empirical D. Theoretical
The correct option is C
Explanation:
Empirical data is the data recorded during the course of an experiment/research by means of observing (it could be direct or indirect) certain properties/quality. From the question, it was described that the student observed and recorded the feather colour and beak shapes of birds that came to the park.
Observing the feather colors and beak shapes of birds and recording it is an example of empirical analysis where the student is analyzing based on an observable data.
What is empirical analysis?Empirical analysis is a method for studying and interpreting data that is based on empirical research. Information that can be obtained through experience or by using the five senses is known as empirical evidence. Empirical research is the name given to it in a scientific setting.
Evidence is needed in empirical analysis to support any theory. An empirical method collects observable data and establishes a repeatable procedure to yield results that can be independently verified. Statistics are frequently used in empirical analysis to back up a thesis.
An empirical research needs the stages namely, observation, induction, deduction, testing and evolution.
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This question is incomplete. The completed question is below
A student records the feather colors and beak shapes of every bird observation in a park. What kind of data is the student recording? A. Qualitative B. Quantitive C. Empirical D. Theoretical
328,000 mm + 137 m = ______________m?
Answer:
465m.
Explanation:
Convert all units to meters. So,
328 + 137 = 465m.
The circus dog in the picture below is balancing a ball on his nose. The ball has __________ energy right now, but when he drops the ball it will have __________ energy.
Right now the ball only has potential energy but when the ball falls that will be converted into kinetic energy because it is moving. BTW Im 14 in 9th grade ya'll should know this.
Answer:
potential; kinetic
Explanation:
why do we accelerate forward when we run?
It depends on what direction you are running in, if it's forward, you'll have to keep to accelerating forward to keep running.
If you stop accelerating forward, you wouldn't be able to move forward.
what are benefits of better cardio-respiratory endurance?
Answer: By strengthening cardiorespiratory endurance your body will be able to take in and carry more oxygen. This will result in an increased number of red blood cells and hemoglobin. Your heart rate will also become stronger and be able to pump out larger volumes of blood and distribute the oxygen better.
Explanation:
larger arteries that are able to carry blood throughout the body
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Which equation can be used to solve for acceleration?
Answer:
The answer's A
Explanation:
Have a good day! :)
Option A is correct. the equation that can be used to solve the acceleration is expressed as [tex]t = \frac{\triangle V}{a}[/tex]
Acceleration is defined as the change in velocity of a body with respect to time. Mathematically;
[tex]a=\frac{\triangle V}{t}[/tex] where:
[tex]\triangle V[/tex] is the change in velocityt is the time takenMaking the time "t" the subject of the formula:
[tex]t = \frac{\triangle V}{a}[/tex]
Hence the equation that can be used to solve the acceleration is expressed as [tex]t = \frac{\triangle V}{a}[/tex]
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A jet engine pushes air at high velocity toward the rear of the plane. Thrust is created moving the plane forward. Which statement is correct about the amount of force the air pushes the engine forward with?
The air pushes the engine with an equal force in the opposite direction. The air pushes the engine with a much smaller force in the same direction.
The air pushes the engine with an equal force in the same direction. The air pushes the engine with a much smaller force in the opposite direction.
in the circuit diagram even in suppose the resistor R1 R2 and R3 have the value of 5 ohm 10 ohm 30 ohm respectively which have been connected to a battery of 12 volt calculate the current through the each resistor be the total current in the circuit and see the total circuit resistance
Three identical resistors of resistances 5Ω, 10Ω and 30Ω are connected with a battery of 12V[tex].[/tex]
To Find :We have to find current through the each resistor and equivalent resistance of circuit[tex].[/tex]
SoluTion :➝ Equivalent resistance of series connection is given by
R = R1 + R2 + R3➝ We know that, Equal current flow through each resistor in series connection.
➝ As per ohm's law, Current flow through a conductor is directly proportional to the applied potential difference.
V = IR◈ Equivalent resistance :
⇒ Req = R1 + R2 + R3
⇒ Req = 5 + 10 + 30
⇒ Req = 45Ω
◈ Current flow in circuit :
⇒ V = IReq
⇒ 12 = I × 45
⇒ I = 0.27A
፨ Therefore, 0.27A current will flow through each resistor.
(4. A bus is moving at 25 m/s when the driver steps on the brakes and brings the bus to a stop in
3.0 s.
a. What is the average acceleration of the bus while braking?
b. If the bus took twice as long to stop, how would the acceleration compare with what you
found in part a?
Answer:
(a) the average acceleration of the bus while braking is 8.333 m/s
(b) if the bus took twice as long to stop, the acceleration will be half of the value obtained in part a. [¹/₂ (8.333 m/s) = 4.16 s]
Explanation:
Given;
initial velocity of the bus, v = 25 m/s
time of the motion, t = 3 s
(a) the average acceleration of the bus while braking
a = dv/dt
where;
a is the bus acceleration
dv is change in velocity
dt is change in time
a = 25 / 3
a = 8.333 m/s
(b) If the bus took twice as long to stop, the duration = 2 x 3s
a = 25 / (2 x 3s)
a = ¹/₂ x (25 / 3)
a = ¹/₂ (8.333 m/s) = 4.16 s
Thus, if the bus took twice as long to stop, the acceleration will be half of the value obtained in part a.
(a) The average acceleration of the bus while braking is 8.333 m/s.
(b) In the case when the bus took twice as long to stop, the acceleration will be half of the value obtained in part a. [¹/₂ of 8.333 m/s) = 4.16 s]
Calculation of acceleration:initial velocity of the bus, v = 25 m/s
time of the motion, t = 3 s
(a) the average acceleration of the bus should be
a = dv/dt
Here,
a is the bus acceleration
DV is a change in velocity
dt is changed in time
So,
a = 25 / 3
a = 8.333 m/s
(b) If the bus took twice as long to stop, the duration = 2 x 3s
So,
a = 25 / (2 x 3s)
a = ¹/₂ x (25 / 3)
a = ¹/₂ (8.333 m/s)
= 4.16 s
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Image caught
on Screen is called
Answer:
Real Image
Explanation:
Images which are formed on the screen by the actual intersection of light rays are called real images.
Answer:
Virtual imageExplanation:
Virtual image can be caught on a screenhope this helps you.
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Calculate velocity of a plane flying 1800 miles North East in 4.5 hours
Answer:
400
Explanation:
We divide time (4.5 hours) and speed (1800 miles)
1800÷45=400