What is the acceleration of the car in initial 2 seconds [ans:20m/s^2

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".

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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.

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:

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

Answer:

In physics a null is a point in a field where the field quantity is zero as the result of two or more opposing quantities completely cancelling each other

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

[tex]\mathfrak\purple{ SORRY \: I \: am \: from \: Tamilnadu}[/tex]

Answer:

no c is the correct answer hope it's helpful to you

Answer:

1.) distance is always positive while displacement can be negative as well.

2.) distance cannot be 0 but displacement can be 0.

3.) distance is a scalar quantity while displacement is 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.

Answer:

72km/hr

= 72× 1000m/1×60×60 sec

= 72000m/ 3600sec

=20m/s

0.5 m

= 0.5×60 sec

= 30 sec

Now,

acceleration = v-u/t

= 40m/s-20m/s divided by 30 sec

= 20m/s divided by 30 sec

= 0.6m/s2

Explanation:

hope this helps you

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.

six cm - centimeters

Answer:

Velocity is quickness of motion or action. A synonym is celerity; a simpler word is speed. In physics, velocity specifically refers to the measurement of the rate and direction of change in position of an object.pls pls mark me branilest

Answer:

Velocity is defined as displacement travelled per unit time in a fixed direction. It is a vector quantity as it has both magnitude and fixed direction.

Please mark me brainliest.

1:-

[tex]\\ \sf\longmapsto 45.23L[/tex]

[tex]\\ \sf\longmapsto 45.23\times 1000[/tex]

[tex]\\ \sf\longmapsto 45230mL[/tex]

2:-

[tex]\\ \sf\longmapsto .035hL[/tex]

[tex]\\ \sf\longmapsto 0.035\times 10000[/tex]

[tex]\\ \sf\longmapsto 350cL[/tex]

3:-

[tex]\\ \sf\longmapsto 27.32[/tex]

[tex]\\ \sf\longmapsto 27.32\times 0.0001[/tex]

[tex]\\ \sf\longmapsto 0.0027m[/tex]

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

Answer: Approximately 22 cm

=========================================================

Explanation:

The unstretched spring is 12.0 cm long. When adding a load of 5.0 N, it stretches to 15.0 cm. This is a displacement of 15.0 - 12.0 = 3.0 cm, which is the amount the spring is stretched.

Convert this displacement to meters (so that it fits with the meters unit buried in Newtons).

3.0 cm = (3.0)/100 = 0.03 m

Apply Hooke's Law to find the spring constant k

F = -kx

5.0 = -k*(0.03)

k = -(5.0)/(0.03)

k = -166.667 approximately

Now we must find the displacement x when F = 15 newtons

F = -kx

-kx = F

x = F/(-k)

x = -F/k

x = -15/(-166.667)

x = 0.089 approximately

x = 0.1

The displacement to one decimal place is about 0.1 meters, which converts to 100*0.1 = 10 cm

So the spring will be stretched to about 12cm+10cm = 22 cm

Answer:

you will have to wear hiking shoes or sports shoes

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

External force and here centripetal force

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

three plus four NERD

Explanation:

480km = 480000m

12hr = 43200 sec

480000/43200 = 11.1111111111

round up 2 sig fig

11m/s

answer is 11m/s

Answer:

The answer is C. The explanation is below.

Answer:

To be accurate, it must be able to make measurements that are close to the actual value.

Answer:

0.0084×91=0.7644

Explanation:

hope this helps

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Explanation:

Option C a magnet attracting a nail

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

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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Answer:

9.722

Explanation:

35*1000÷1×60*60

35000÷3600

9.722

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