Which statement correctly describes a characteristic that a scientific measuring tool should have?
A. To be accurate, it must be able to make measurements that are close to the actual value.
B. To be accurate, it must be able to make measurements using very small units.
C. To be accurate, it must be able to make measurements using very large units.
D. To be accurate, it must be able to give consistent measurements of a quantity
Answer:
To be accurate, it must be able to make measurements that are close to the actual value.
On which atomic property proposed by Henry Moseley is the current periodic table of the elements based?(1 point)
electric charge
nucleus size
atomic number
atomic weight
Originally, the periodic table was ordered by atomic weight, but there were some problems with this order for some particular cases.
In 1913 Moseley proposes to use the atomic number (number of protons of the atom) to order the elements in the periodic table. There are some motives to do this, each element has a different number of protons, and if you add one proton to the nucleus, you get the next element in the periodic table.
This also relates to the x-ray diffraction of the elements (as the number of protons increase, also do the numbers of electrons, thus the energy of the x-rays also increases). At the moment this was the best way to order the periodic table, but in recent years some problems were found, but at the moment, there does not exist a "better" periodic order.
Concluding, the correct option is "atomic number".
https://brainly.com/question/11155928
Answer:
1. Which statement about metals and nonmetals is correct?
*Metals can be hammered into thin sheets, and nonmetals are brittle.*
2. Based on properties of elements in the periodic table, which element is the best conductor of thermal energy?
*vanadium (V)*
3. Which element has four valence electrons?
*silicon (Si)*
4. Which statement best explains why hydrogen’s atomic number is equal to its mass?
*Hydrogen does not have any neutrons.*
5. Which statement correctly compares the valence electrons for atoms of francium (Fr) and barium (Ba)?
*Francium has fewer valence electrons, but they are in a higher energy level.*
6. Gallium has an atomic number of 31 and a mass number of 70. Which table shows the number of protons, neutrons, and electrons in a gallium ion with a +3 charge?
*protons 31, neutrons 39, electrons 28*
7. Which is true about about stable isotopes?
*A stable nucleus has a similar number of protons and neutrons.*
8. On which atomic property proposed by Henry Moseley is the current periodic table of the elements based?
*atomic number*
9. Which incorrect aspect of Rutherford’s model was fixed by Bohr’s model?
*Electrons move freely in curved paths around the nucleus.*
10. You plan to pass alpha particles through a field that contains a consistent type of particle. Which configuration will result in the largest deflection of alpha particles?
*low-energy alpha particles passing through a field of high mass-number-particles*
11. Where on the periodic table do you find elements that have full valence electron shells?
*on the right side of the periodic table*
12. Which element would have a full outer shell of electrons if it gained three electrons?
*nitrogen*
13. Which group of elements has the most similar chemical properties?
*fluorine, chlorine, and iodine*
14. Group 2 elements have two valence electrons. Which kind of bond will they most likely form, and why?
*An ionic bond is likely because they will want to give away two valence electrons in order to become stable.*
15. An element has six valence electrons. Which ionic charge will its ion carry?
*2–*
16 and 17 are writing.
Explanation:
These are the correct answers for The Periodic Table Unit Test.
Convert: 110 km/h to m/s
Answer:
30.5555556 m/s
You can write like "30.56 m/s".
Answer:
Below
Explanation:
You can convert km/h to m/s by dividing the value by 3.6
110 km/h / 3.6 = 30.5556 m/s
*not sure if your teacher wants you to round to sig figs for this but here it is anyways. Because 110 has 2 sig figs it would be :
31 m/s
Hope this helps! Best of luck <3
The impact of pesticides on the ecological systems.
(marks 5)
Explanation:
Pesticides are those substance whoch increase the fertlite rate of the soil but it will damage rhe soil it remine from a long time it descrese the rate of fertize rate
Which object would have a greater buoyant force: 350 g of copper (ρ= 8,890 kg/m3) or 350 g of ice (ρ= 917 kg/m3) if both are submerged in water?
three plus four NERD
Câu 2 : Một vật dao động điều hòa với phương trình : x = 5cos(4πt – π/3) (cm)
a. Xác định : li độ cực đại, chu kỳ, tần số, pha ban đầu của vật ?
b. Xác định li độ của vật tại thời điểm t = 0 và t = 2 (s)
Li độ cực đại x=A=5 cm
Chu kỳ T= [tex]\frac{2\pi }{4\pi }[/tex] = 0.5s
Tần số f= 1/T = 2Hz
Pha ban đầu = -π/3
x(0) = 2.5cm
x(2)= 2.5cm
11. What is the resolution of this ruler? 6-centimeters
six cm - centimeters
Please answer these, I’m willing to give plenty of points.
Does a person with a family history of a breast cancer have a higher chance of developing breast cancer during her life?
IV:_________
DV:__________
Hypothesis:__________
Does grass grow faster under shade of a tree or in direct sunlight?
IV:_______
DV:_______
Hypothesis:_________
Observation: students do not eat very much of their food in the lunchroom.
Question: will students eat more food in lunch room if more fresh fruit and vegetables are used?
IV:_________
DV:__________
Hypothesis:_______
Observation: my dog won’t stop barking whenever someone rings the doorbell.
Question: will my dog bark less when the doorbell rings if he exercises for an hour everyday?
IV:_____
DV:_______
Hypothesis:________
Create your own question.
Observation:___________
Question:_____________
IV:________
DV:_________
Hypothesis:____________
Please send help before school starts!!!!!
[tex]\mathfrak\purple{ SORRY \: I \: am \: from \: Tamilnadu}[/tex]
Answer:
no c is the correct answer hope it's helpful to you
Is it possible for two different objects to have the same speed but different velocities? Explain your answer.
Yes
Explanation:
Objects have the same velocity only if they are moving the same speed and in the same direction. objects moving at different speeds, in different directions or both have different velocities
Answer:
yes
Explanation:
speed and velocity are the same thing, except that velocity includes a direction.
ex.
if two things are traveling at 3mi/h, then thats the same speed. but if one is going north and the other south, then those are two different velocities
what is known as vector quantity?
Answer:
Vector Quantities:
Vector quantities refer to the physical quantities characterized by the presence of both magnitude as well as direction. For example, displacement, force, torque, momentum, acceleration, velocity, etc.
K=(1/2)my^2 v?
A.) K=mv
B.) m= Kv^2
C.) v=sqrt(2k/m)
D.) none of above
Answer:
The answer is C. The explanation is below.
What is the magnitude of a vector if the x component is -12 m and the y component is 21m?
Answer:
22.02
Explanation:
(-21)²+(12)²=r²
r=√585
r=22.02
What's centripetal force..........
Answer:
a force that acts on a body moving in a circular path and is directed toward the center around which the body is moving.
Explanation:
Answer:
A net force that acts on an object to keep it moving along a circular path
at Newton's first lawExternal force and here centripetal force
Metric conversions
SHOW WORK!!!
1.) 45.23 L —> mL
2.) .035 hL—> cL
3.) 27.32 mm —> m
1:-
1L=1000mL[tex]\\ \sf\longmapsto 45.23L[/tex]
[tex]\\ \sf\longmapsto 45.23\times 1000[/tex]
[tex]\\ \sf\longmapsto 45230mL[/tex]
2:-
1hL=10000cL[tex]\\ \sf\longmapsto .035hL[/tex]
[tex]\\ \sf\longmapsto 0.035\times 10000[/tex]
[tex]\\ \sf\longmapsto 350cL[/tex]
3:-
1mm=0.0001m[tex]\\ \sf\longmapsto 27.32[/tex]
[tex]\\ \sf\longmapsto 27.32\times 0.0001[/tex]
[tex]\\ \sf\longmapsto 0.0027m[/tex]
During which portion of its motion-A, B, or C- does the train have the smallest speed?
Answer:
1
Explanation:
B is -1 m/s but it transfers to 1
During portion B of its motion, the train would have the smallest speed because the slope of the position time graph is the lowest for portion B.
What is speed?The total distance covered by any object per unit of time is known as speed. It depends only on the magnitude of the moving object.
As given in the problem we have to find out for which portion of the motion the train would have the smallest speed,
As we know that speed is given by the slope of the position-time graph.
For portion C the slope of the given position-time graph is highest therefore the speed of the train would be largest for portion C.
For portion B the slope of the given position-time graph is lowest therefore the speed of the train would be lowest for portion B.
Learn more about speed from here
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Given the graph below, the resistance of the wire in Ohms is:
a 0.25
b 4
c 3.75
d 0
Answer:
C . 3.75 Ohms
Explanation:
V = IR
R = V / I
From the graph, you pick a value for potential difference and find its corresponding current.
The resistance of the wire in Ohms is 3.75 Ω, therefore the correct answer is option C
What is resistance?Resistance is the obstruction of electrons in an electrically conducting material.
The mathematical relation for resistance can be understood with the help of the empirical relation provided by Ohm's law.
V=IR
where V is the voltage
I is the current
From the voltage-current graph, one can know the resistance by calculating the slope of the graph
As shown in the graph the variation of the voltage with the current
Y axis represents the voltage and the X axis represents the current
slope = variation in the Y coordinate /variation in the X coordinate
resistance = variation in the voltage /variation in the current
= (30 - 0 )/ (8-0 )
= 3.75 Ω
Thus, by observation and calculation from the graph, the resistance of the wire comes out to be 3.75 Ω
Learn more about resistance, here
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Qualitative observations use the sense of _____ to observe the results.
Answer:
5 sensory organs
Explanation:
Sight, smell, touch, taste and hear
what is a Homonym for a type of cloak?
Answer:
In both cases, the sound and spelling are the same, and only the definition changes. Here are 30 more examples of homonyms. Note that some homonyms have more than two meanings (for example, "tender" can also mean sensitive, easily chewed, or even refer to chicken strips), but to keep things simple we've only included two in our homonyms list:
A cyclist travels at 15 m/s during a sprint finish. What is this speed in km/h
Answer:
54 km/hr
Explanation:
m/s to km/hr => 18/5
15 m/s to km/hr => 15 x 18/5 =>3 x 18 => 54km/hr
Un alumno menciona que al abrir la ventana de su casa sintió cómo el frío ingresaba a su cuerpo. Menciona cuál es la verdadera razón por la cual el niño tuvo la sensación de frío. *
a) Porque el aire tiene una temperatura menor que la de su cuerpo; por eso se propaga más rápido.
b) Porque la temperatura de su cuerpo, siente el aire frio que entra por la ventana.
c) Porque el calor de su cuerpo se propaga al medio ambiente, al ser la temperatura del niño mayor que la del aire exterior.
d) Porque la temperatura del aire es igual a la temperatura del cuerpo.
Answer:
My believe the answer is
A.) or B.)
Explanation:
Here is why I think A is the answer.
If we use the process of elimination, it would look like this,
a) Porque el aire tiene una temperatura menor que la de su cuerpo; por eso se propaga más rápido.
This makes sense because we all know in winter the weather is very cold and freezing.
b) Porque la temperatura de su cuerpo, siente el aire frio que entra por la ventana.
I feel like this answer is the question, but it could also be an answer, sorry, I'm a little uncertain.
c) Porque el calor de su cuerpo se propaga al medio ambiente, al ser la temperatura del niño mayor que la del aire exterior.
This answer has nothing to do with the question, plus it is very false, our body heat is not enough to overcome the very cold temperature from outside.
d) Porque la temperatura del aire es igual a la temperatura del cuerpo.
This is false because again our body heat is not even compared to the freezing cold temperatures from the winter.
Well, have a nice rest of the day!ba baiii!
1.14 Which of the following is an example of a force without touching? A A boy pushing a trolley. B The mass of a car. C с A magnet attracting a nail.D A jug of wale;
Explanation:
Option C a magnet attracting a nail
A hydraulic lift has pistons with diameter 28cm and 70cm, respectively. If a force of 500 N is exerted at the input piston. What is the maximum load that can be lifted the output piston?
Answer:
3125 N
Explanation:
diameter /2 =radius
so r1 =14cm , r2 =35cm
f1/A1 =f2/A2.
f2 = f1 × A2 / A1
=500×1225 pi cm² / 96 pi cm²
f2 =3125N
Record the length of the line shown in centimeters.
7.30
7.12
7.3
7.28
Please help will be marked most brainlist !!
Zooming I. On the image the red line is just short of the 3rd line past the 7 so it is not 7.3 but just a little under.
Answer: 7.28
specific heat capicity of water is 4200Jkg-1 C-1 . what its meaning .
The specific heat capacity of water is 4,200 Joules per kilogram per degree Celsius (J/kg°C). This means that it takes 4,200 J to raise the temperature of 1 kg of water by 1°C. Lead will warm up and cool down faster because it doesn't take much energy to change its temperature.
How is the sum of forces related to the objects'
movement?
Answer:
The net force is the combined effect (the sum) of the real forces acting on the object. ... When there is a net force on an object, it causes the object to accelerate in the direction of the net force; this is not the same as the direction of the motion unless the object is going in a straight line.
Two trucks left the warehouse at the same time and drove in
the same direction along a straight road. One truck drove at 68
km/h while the other drove at 57 km/h. Find theirs distance
apart after2 hours.
e. weight = mass x gravitational field strength
i. mass as subject
ii. gravitarional field strenght as subject
f. density=mass/volume
i. mass as subject
ii. volume as subject
iii. state the relationship between density and mass
iv. state the relationship between densith anf volune
Answer:
Density is directly proportional to mass
Density is inversely proportional to volume
A man walks 4 m north & then turns and walks 6 m east. What is the total distance & displacement?
O Distance: 10 m & displacement: 10 m NE
O Distance: 10 m NE & displacement 10 m
Distance: 10 m & displacement: 7.2 m NE
O Distance: 7.2 m & displacement: 10 m NE
Answer:
Distance = 10m and Displacement = 7.2NE
A sled is moving at a constant speed down a surface inclined at 45.0° with the horizontal and travels 30 meters in 4 seconds. Calculate the vertical velocity of the sled at the end of 4 seconds.
Explanation:
msndskkdkekskdkdkjejdkdkd
exmple of relative velocity
.
.
...
People also ask
What are some examples of relative motion?
Relative Motion refers to the motion or speed of any object in respect to a particular point. For example, a ball thrown upward while in a moving object such as a bus, would be traveling the same speed with respect to the bus and would fall again in relation to that speed.
Answer:
The example of relative velocity - a boat crosses a river that is flowing at some rate or an aeroplane encountering wind during its motion.