Answer:
See explanation
Explanation:
To find out the electronic structure of each element, you must know the number of electrons it contains.
If you find that out(the number of electrons in the neutral atom of an element is the same as its atomic number). Then you arrange those electrons in such a way that the first shell has only two electrons and subsequent shells have eight electrons.
Look up the groups to which the elements belong in the periodic table All the elements are in group 1 so the last shell must have only one electron.
Two sound waves, from two different sources with the same frequency, 540 Hz, travel in the same direction at 330 m s . The sources are in phase. What is the phase difference of the waves at a point that is 4.40 m from one source and 4.00 m from the other?
Answer:
The value is [tex]\Delta \phi = 4.12 \ rad[/tex]
Explanation:
From the question we are told that
The frequency of each sound is [tex]f_1 = f_2 = f = 540 \ Hz[/tex]
The speed of the sounds is [tex]v = 330 \ m/s[/tex]
The distance of the first source from the point considered is [tex]a = 4.40 \ m[/tex]
The distance of the second source from the point considered is [tex]b = 4.00 \ m[/tex]
Generally the phase angle made by the first sound wave at the considered point is mathematically represented as
[tex]\phi_a = 2 \pi [\frac{a}{\lambda} + ft][/tex]
Generally the phase angle made by the first sound wave at the considered point is mathematically represented as
[tex]\phi_b = 2 \pi [\frac{b}{\lambda} + ft][/tex]
Here b is the distance o f the first wave from the considered point
Gnerally the phase diffencence is mathematically represented as
[tex]\Delta \phi= \phi_a - \phi_b = 2 \pi [\frac{ a}{\lambda} + ft ] - 2 \pi [\frac{b}{\lambda} + ft ][/tex]
=> [tex]\Delta \phi = \frac{2\pi [ a - b]}{ \lambda }[/tex]
Gnerally the wavelength is mathematically represented as
[tex]\lambda = \frac{v}{f}[/tex]
=> [tex]\lambda = \frac{330}{540}[/tex]
=> [tex]\lambda = 0.611 \ m[/tex]
=> [tex]\Delta \phi = \frac{2* 3.142 [ 4.40 - 4.0 ]}{ 0.611 }[/tex]
=> [tex]\Delta \phi = 4.12 \ rad[/tex]
A 15.0-kg block is dragged over a rough, horizontal surface by a 70.0-N force acting at 20.0° above the horizontal. The block is displaced 5.00 m, and the coefficient of kinetic friction is 0.300. Find the work done on the block by a) The 70-N force, b) The normal force, and c) The gravitational force. D) What is the increase in internal energy of the block-surface system due to friction? E) Find the total change in the block's kinetic energy.
Answer:
Explanation:
from the question we are told that
Load [tex]L=15kg[/tex]
Force[tex]F=70N[/tex]
Angle of inclination [tex]=20.0 degres[/tex]
Displacement [tex]m=5 meters[/tex]
coefficient of kinetic friction [tex]\alpha =0.300[/tex]
HELP PLS ITS BEEN AN 3 HOURS
Answer:
0.433 s
Explanation:
Let's break the projectile motion into its horizontal and vertical components:
Horizontal component (x):
3.22 * cos(62.9)Vertical component (y):
3.22 * sin(62.9)We want to find the time required for the hurdler to travel a distance of 0.635 m. In order words, his displacement should be 0.635 m in the x-direction.
Since we don't have the final velocity, we can use this constant acceleration equation:
Δx = v₀t + 1/2at²We have three known variables and want to solve for t. Using this equation in the x-direction, we have:
Δx = 0.635 mv₀ = 3.22 * cos(62.9)a = 0 m/s² t = ?Substitute these values into the equation.
0.635 = [3.22 * cos(62.9)] t + 1/2(0) t²Simplify the equation.
0.635 = 3.22 * cos(62.9) tDivide both sides by the horizontal component of the initial velocity.
0.432899075 = tSince we start with 3 sig figs, we will round this value to 0.433. The time it takes to clear the hurdle is 0.433 seconds.
If a 5 n force is pushing upward on an object what force would need to be applied to create a net force of zero?
Answer:
the foce aplied to make the net force be 0 is 5n force pushing downward on the object becasue it will cancel it out
Explanation:
A cheap effective and simple way to help body recover is to get adequate amounts of. ?
A cheap effective and simple way to help the body recover is to get adequate amounts of sleep, as our body need rest to reduce the tiredness and physical as well as mental stress in our human system.
What is exercise?Exercise is the activity that includes the physical movements of the body and results in fitness, wellness, and healthiness of the person to protect and lower the risks of getting diseases. It allows the person to maintain a healthy weight.
Getting enough sleep is an easy, affordable technique to aid in the body's recovery. Resting our bodies helps our minds and bodies recuperate from fatigue and physical and emotional stress.
Thus, an adequate amount of sleep is one of the effective ways to help the body recover.
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Before Freddy lands on the skateboard it has a certain momentum. After landing, the skateboards momentum
Answer:
remains the same
Explanation:
Momentum refers to the quantity of motion of a body. When any body of mass moves, it possess momentum. Numerically,
Momentum = mass x velocity
i.e. momentum is the product of the mass x velocity
Momentum of a body is always conserved.
In the context, the skateboard has certain momentum before Freddy lands on it. After Freddy lands, the momentum of skateboard remains the same, there is no change in the momentum.
This is because, here the momentum is conserved. After Freddy lands on the skateboard, the total mass on the skateboard increases and so the velocity decreases making the momentum same before the landing.
A driver slows down her car from 32.7 km/hr at a constant rate of 0.63 m/s2 just by taking her foot of the accelerator (the gas pedal). Calculate the distance the car travels during the sixth second (between t=5 and t=6 seconds)that she is coasting.
Answer: She moves 5.616 meters in that second.
Explanation:
If we define t = 0s as the moment when she starts decelerating we can write the function of acceleration as:
a(t) = -(0.63 m/s^2)
where the negative sign is because she is slowing down.
The velocity equation can be found if we integrate over time:
v(t) = -(0.63m/s^2)*t + v0
Where v0 is the constant of integration, that represents the initial velocity, in this case is:
v0 = 32.7 km/h
Now, because the acceleration is in m/s^2, we should write this velocity in m/s.
in one km we have 1000 meters, and in one hour we have 3600 seconds, then we have that:
32.7 km/h = 32.7 *(1000/3600) m/s = 9.08 m/s
Then the velocity equation becomes:
v(t) = -(0.63m/s^2)*t + 9.08 m/s
And for the position equation, we should integrate again to get:
p(t) = -(1/2)*(0.63m/s^2)*t^2 + (9.08m/s)*t + p0
Where p0 is the initial position.
For this problem, we want to find the distance that she moved between t = 5s and t = 6s, and that can be calculated as:
D = p(6s) - p(5s)
D = -(1/2)*(0.63m/s^2)*(6s)^2 + (9.08m/s)*6s + p0 +(1/2)*(0.63m/s^2)*(5s)^2 - (9.08m/s)*(5s) - p0
D = -(1/2)*(0.63m/s^2)*((6s)^2 - (5s)^2) + (9.08m/s)*(6s - 5s)
D = 5.615 m
She moves 5.616 meters in that second.
Calculate the total energy transferred when 200 g of ice cubes at 0°C are changed to steam at 100°C.
Specific heat capacity of water = 4200 J/kg °C
Specific latent heat of fusion = 340 kJ/kg
Specific latent heat of vaporisation = 2260 kJ/kg
Answer:
[tex]604000\ \text{J}[/tex]
Explanation:
m = Mass of ice = 200 g
[tex]\Delta T[/tex] = Temperature change of water = [tex](100-0)^{\circ}\text{C}[/tex]
c = Specific heat capacity of water = 4200 J/kg °C
[tex]L_f[/tex] = Specific latent heat of fusion = 340 kJ/kg
[tex]L_v[/tex] = Specific latent heat of vaporisation = 2260 kJ/kg
Heat required to convert ice to water = [tex]mL_f[/tex]
Heat required to raise the temperature of water to boiling point = [tex]mc\Delta T[/tex]
Heat required to convert water to steam = [tex]mL_v[/tex]
Total heat required
[tex]q=mL_f+mc\Delta T+mL_v\\\Rightarrow q=m(L_f+c\Delta T+L_v)\\\Rightarrow q=0.2(340\times 10^3+4200(100-0)+2260\times 10^3)\\\Rightarrow q=604000\ \text{J}[/tex]
Heat required to convert the given amount of ice to steam at the required temperature is [tex]604000\ \text{J}[/tex].
In the one pully system when you move the mass from the 20 cm mark to the 15 cm mark, it moves 5 cm. How far did you pull the string. Question 1 options: 5 cm 10 cm 15 cm 20 cm
Answer:
5 cm
Explanation:
A piece of wood 400N in weight and 50cm X 30cm X 20cm in size lies on 50cm X 20cm face. Calculate the pressure exerted by it.
Answer:
P = 4000 [Pa]
Explanation:
Pressure is defined as the relationship between Force and the area where the body rests.
The support area is equal to:
[tex]A=50*20=1000[cm^{2} ][/tex]
But we must convert from square centimeters to square meters.
[tex]1000[cm^{2}]*\frac{1^{2}m^{2} }{100^{2}m^{2} }=0.1[m^{2} ][/tex]
And the pressure is:
[tex]P=\frac{F}{A} \\P=400/0.1\\P=4000[N/m^{2} ]or 4000[Pa][/tex]
no work is said to be done by standing man carrying 500kg load.why?
Answer:
no work is said to be done by standing man carrying 500kg load because
Explanation:
for the work to be done there should be two conditions i.e force should be applied and displacement must be covered.So for a man carring a 500 kg load force is there but he covers no distance by standing so displacement will be zero and since
work =force\displacement
displacement is zero so we can say that no work is done
Sasha lifts a couch 8.2 meters from the ground floor of her house to the attic. If the couch has a mass of 120 kg, what is the gravitational potential energy gained by the couch? Estimate g as 9.81 m/s^2.
Answer:
9653.04 joules
Explanation:
H= 8.2 m
M= 120 kg
G= 9.81 m/s^2
P.E= ?
P.E = MGH
P.E = 120 x 9.81 x 8.2
P.E = 9653.04 joules
Name three items to remember when completing a job application.
1. ) It's good to remember contact information such as phone number or email.
2.) Your address, so if they need to mail anything to you, they can. This is also a necessary point of information on most job applications anyway.
3.) Past job experiences and ways to contact them. This is probably one of the most important things as it shows you've worked before and are willing to talk to past employers.
May I have brainliest please? :)
Answer:
the other answer is correct
Explanation:
i do flvs and this was on the career final exam
18)
Swimmers speed along the river (downstream) is 20km/hr
and can swim Cupstream) at 8km lhr. calculate the
velocity of the stream and the swimmer's possible
speed in still water,
Answer:
The speed of the stream is 6 km/h and the speed of the swimmers in still water is 14 Km/h
Explanation:
Relative Speeds
When swimming downstream, the velocity (speed, really) of the stream (Vs) and the speed of the swimmers (Vm) are collaborative. When swimming upstream the speed of the stream subtracts to the speed of the swimmers, thus:
Vm + Vs = 20
Vm - Vs = 8
Adding both equations:
2Vm = 28
Vm = 28/2 = 14
From the first equation:
Vs = 20 - Vm = 20 - 14 = 6
The speed of the stream is 6 km/h and the speed of the swimmers in still water is 14 Km/h
Two cylinders A&B at the same temperature contains the same quantity of the same kind of gas. Cylinder A has three times the volume of cylinder B. What can you conclude about the pressure the gases exert
Answer:
pressure in cylinder A must be one third of pressure in cylinder B
Explanation:
We are told that the temperature and quantity of the gases in the 2 cylinders are same.
Thus, number of moles and temperature will be the same for both cylinders.
To this effect we will use the formula for ideal gas equation which is;
PV = nRT
Where;
P is prrssure
V is volume
n is number of moles
T is temperature
R is gas constant
We are told that Cylinder A has three times the volume of cylinder .
Thus;
V_a = 3V_b
For cylinder A;
Pressure = P_a
Volume = 3V_b
Number of moles = n
Thus;
P_a × 3V_b = nRT
For cylinder B;
Pressure = P_b
Volume = V_b
Number of moles = n
Thus,
P_b × V_b = nRT
Combining the equations for both cylinders, we have;
P_a × 3V_b = P_b × V_b
V_b will cancel out to give;
3P_a = P_b
Divide both sides by 3 to get;
P_a = ⅓P_b
Thus, pressure in cylinder A must be one third of pressure in cylinder B
Nuclear power plants produce a waste product of cesium-137, which has a half-life of 30 years. How long would it take for the cesium to decay to 1/8 of its original amount?
90 years
120 years
30 years
60 years
Engineers were planning to install decorative columns made of marble, of density 2560kg/m cubed, in front of a building. The columns were 2.72m tall and of radius 45 cm
a) Calculate the mass of column
ii) Calculate the pressure exerted by each column on the ground
iii) Engineers found out that the ground beneath the columns would not withstand the pressure calculated in c(ii). Suggest 1 possible change to each column, the engineers do , to solve this problem
Answer:
See the answers below.
Explanation:
We must apply the definition of density which is the ratio of mass to volume.
[tex]Ro=m/v[/tex]
where:
Ro = density = 2560 [kg/m³]
m = mass [kg]
v = volume [m³]
With the column height data and column radius we can calculate the volume, since it resembles the volume of a cylinder. In this way the volume of a cylinder is defined by the following expression.
[tex]V=\pi *r^{2}*h[/tex]
where:
r = radius = 45 [cm] = 0.45 [m]
h = height = 2.72 [m]
[tex]V = \pi *(0.45)^{2}*2.72 \\V = 1.73 [m^{3} ][/tex]
a)
The mass can be calculated as follows.
[tex]m=Ro*V\\m=2560*1.73\\m= 4428.8 [kg][/tex]
ii)
Pressure is defined as the relationship of force over an area.
The area can be calculated with the radius of the cylinder.
[tex]A=\pi *r^{2}\\A = \pi *(0.45)^{2}\\A = 0.636 [m^{2} ][/tex]
Therefore
[tex]P=F/A\\where:\\F=m*g\\F=4428.8*9.81\\F=43446.53[N][/tex]
[tex]P=43446.53/0.636\\P=68312.15[Pa]\\P=68.31[kPa][/tex]
iii)
If the pressure is very large we must analyze the pressure equation again.
[tex]P=\frac{F}{A}[/tex]
We can see that the pressure depends on the strength (weight) and the area of the column. In this way if we increase the value of the area (denominator) we see that the pressure decreases.
If the new Radius is 50 [cm] = 0.5 [m]
[tex]A=\pi *(0.5)^{2}\\A = 0.785 [m^{2} ][/tex]
Now we can calculate again the pressure.
[tex]P=43446.53/0.785\\P=55317.84[Pa]=55.32[kPa][/tex]
We can see the reduction in pressure.
What is an institutional review board? Select one: a. The people who control the qualifications of psychology professors at colleges and universities b. The committee who oversees the ethical treatment of college students. c. The committee who insures ethical treatment of research participants d. An unknown group of Avengers
Answer: The correct option is C (The committee who insures ethical treatment of research participants)
Explanation:
The institute Review Board ( IRB) is a committee that reviews research that involves human beings and approves it once it's of ethical standard. This committee is usually made up of scholars that arefrom various departments who are mandated to review proposals to ensure that they comply with ethical guidelines and write a summary of proposed risks to subjects.
The primary importance of institute Review board is to protect the rights and welfare of human research subjects and to ensure that appropriate steps are taken to protect the rights and welfare of humans participating as subjects in the research, both in advance and by periodic review,
A student walks the hallway for 25 m stops to talk and continues down the hallway another 10 m what is the distance and displacement
Answer:
Distance = displacement = 35m
Explanation:
The distance of the student is how far he has gone.
Distance = 25m + 10m
Distance = 35m
Displacement is the distance specified in specific direction. Since the student walk in the sane direction, thence the displacement is also 35m
how does area affect pressure?
Answer:
???????????????? Tell me also
Answer:
Area is inversely proportional to pressure.
Explanation:
✍ Lesser the area, higher the pressure.
✍ More the area, lower the pressure.
Thank You
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In position A
The mirror has to be observed in the ray reflected from the mirror.
Since the the angle of reflection is equal to the angle of incidence, the reflected ray must be in equal path as the incident ray.
That phenomenon is only in diagram A
Why is it an advantage to the beef
producer that beef cattle are foragers?
A. The cattle can graze for grain to eat.
B. It reduces labor as long as there is a good supply of
grasses.
C. The beef will grow much faster with an abundance of
food.
D. It helps to make the herd more fertile.
what is meaning of forages
It reduces labor as long as there is a good supply of grasses. Therefore, option B is correct.
What are the advantages of beef production?Ruminants are unique animals that are classified as such. This indicates that their stomach has four distinct components and is particularly built. The several compartments aid in the digestion of the lignin and cellulose found in the plants they consume. The energy can be converted by cattle in a way that is not possible for humans.
Numerous additional by-products from cattle are also available to us. These include sections of the cow that are utilized to create goods for the house, body, food, and industry. Other than beef, byproducts are goods with added value that come from cattle.
The claim that land for beef cattle may be used for other crops for human use is one that is frequently made. This is not totally accurate, though, as beef cattle live a large portion of their lives on forage-based systems. If not utilized for grazing, forages are often cultivated on land that is unsuitable for other high-value crops and would be regarded as a land of marginal use.
Thus, option B is correct.
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a communication satellite is stationed in an orbit high abovr the earth. which of the follwoing will not be exhibeted by communication satellites.
a) rotational motion and periodic motion
b) periodic motion and circular motion
c) rotational motion and rectilinear motion
d) periodic motion and oscillatory motion
i) A and B
ii) B and C
iii) A only
iv) D only
Pls help
Answer:
i think ii)
B and c
i'm note sure though
Nuclear fusion is more reliable and sustainable source of energy than nuclear fission chain reaction justify this statement with plausible arguments
Answer:
1. Nuclear fusion does not generate radioactive nuclear wastes as nuclear fission does.
2. Nuclear fusion cannot lead to disastrous powerplant explosions as nuclear fission does.
3. More energy is generated during nuclear fusion than in nuclear fission.
Explanation:
Nuclear fusion involves the combination of lighter atoms such as hydrogen to form a heavier nucleus, in the process producing a tremendous amount of energy.
Nuclear fission on the other hand involves splitting a heavy nucleus into two lighter nuclei, releasing energy in the process.
Nuclear fusion can be more reliable than nuclear fission in energy generation due to the following reasons:There are no radioactive waste products obtained as a result of nuclear fusion, unlike nuclear fission. This is because the elements involved in Nuclear fusion are relatively radioactively stable elements.The risk of nuclear powerplant explosion due to out of control chain reactions is reduced in nuclear fusion because the reaction can only occur in perfect conditions under high pressure and temperatures (e.g the sun). When any of these conditions is removed due to a fault, the reaction automatically stops.More energy is generated during nuclear fusion than in nuclear fission.Nuclear fusion and fission release a tremendous amount of energy using radioactive material as a fuel.
What are Fusion and fission?Nuclear fusion is a reaction that occurs when two nuclei merge to form a larger nucleus and release a massive quantity of energy.
The breaking of two nuclei into smaller nuclei is known as nuclear fission. Nuclear fission also releases a significant amount of energy.
The key is how tightly the nucleons in a nucleus are bound together. The surplus energy will be released if a nuclear reaction produces nuclei that are more closely bonded than the originals. The most securely bound atomic nuclei are found to be around the size of iron-56. Thus,
When a nucleus significantly larger than iron is broken into tiny bits, energy is released since the smaller fragments have lower energy.
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An airplane flying at 57 m/s releases a crate of supplies that lands 821 m from where it was released. How high was the plane flying?
1020 m
14.4 m
71 m
5910 m
Answer:1020
Explanation:
C. A rock falls for 4 seconds. How far did it fall
Answer:
Calculates the free fall distance and velocity without air resistance from the ... for 24 seconds so i asumed that he fell for twelve seconds and this did the rest of it.
Explanation:
If a rock falls for 4 seconds assuming its initial velocity is zero and its falls only under the influence of gravity it would fall 122.625 m
What are the three equations of motion?Newton provided three equations of motion.
The first equation is given as follows
v = u + at
the second equation is given as follows
S = ut + 1/2×a×t²
the third equation is given as follows
v² - u² = 2×a×s
As given in the problem If a rock falls for 4 seconds assuming its initial velocity is zero and its falls only under the influence of gravity it would fall
S = ut + 1/2at²
u= 0 m/s , a=9.81 m/s² and t =4seconds
S = 0+ 0.5*9.81*5²
S= 122.625 m
Thus, the rock would fall 122.625 m if it falls for 4 seconds
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Question 7 of 10
Which three statements describe electromagnetic waves?
A. They can transfer energy through a vacuum.
I B. They vibrate parallel to the direction in which the wave travels.
O C. They vibrate in two directions that are perpendicular to each
other.
D. They radiate outward in all directions.
Answer:
A. They can transfer energy through a vacuum
C. They vibrate in two directions that are perpendicular to each other
D. They radiate outward in all directions
Explanation:
A statement (A), a statement (C), and a statement (D) are correct because electromagnetic waves can only transfer energy through the vacuum.
What is an electromagnetic wave?The waves that are related to both electricity and magnetism are known as electromagnetic (EM) waves. These waves are made up of time-varying electric and magnetic fields that travel over space.
The correct statements are:
They can transfer energy through a vacuum.They vibrate in two directions that are perpendicular to each other.They radiate outward in all directions.Thus, a statement (A), a statement (C), and a statement (D) are correct because electromagnetic waves can only transfer energy through the vacuum.
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A 10 g bullet accelerates to 400 m/s after being fired from a gun with a mass of 2.0 kg.
(i) What is the momentum of the bullet?
(ii) What is the momentum of the gun?
(iii) What is the velocity of the recoiling gun?
Answer:
See the answers below.
Explanation:
Momentum is defined as the product of mass by velocity, and can be calculated by means of the following expression.
[tex]P=m*v[/tex]
where:
P = Momentum [kg*m/s]
m = mass = 10 [g] = 0.01 [kg]
v = velocity = 400 [m/s]
i)
[tex]P=0.01*400\\P=4[kg*m/s][/tex]
ii)
The momentum of the gun is equal to zero, because it does not move before being fired, the weapon only moves after having fired the weapon.
[tex]P_{gun}=0[/tex]
iii)
Since the momentum is conserved before and after the shot, the same momentum given to the bullet is equal to the momentum received by the gun.
[tex]P=m*v_{recoil}[/tex]
[tex]v_{recoil}=P/m\\v_{recoil}= 4/2\\v_{recoil}=2[m/s][/tex]
If an area has high air pressure and low humidity, what type of weather will it most likely have?
Answer:
c
Explanation:
PLEASE HELP ASAP ILL GIVE U BRAINLIEST
An object is pulled to the left by a force of 100 N and to the right by a force of
80N. What is the net force acting on the object?
Answer: 20 N
Explanation: Net force is the sum of all forces acting on an object. For example, in a tag of war, when one team is pulling the tag with a force of 100 N and the other with 80 N, the net force would be 20 N at the direction of the first team (100 N - 80 N = 20 N).