(PLEASE HELP ASAP)

In what ways can you determine the number of valence electrons in an atom
using the periodic table? (select all that apply)

The number of valence electrons equals the number in the ones place for groups 3-12

The number of valence electrons equals the number in the ones place for groups 1,2 and 13-18

The number of valence electrons equals the number in the tens place for groups 1,2and 13-18

The number of valence electrons equals the number in front of the "A" for groups 1A-80

Answer:

On Waves. Quantum mechanically, an electron can be described by a wave function oscillating in space and time that has mean values equal to the expectation values of observables corresponding to given operators. ... Electrons are fermions. They are charged particles. in short the quantum theory

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Answer:

A

Explanation:

i just did this on usatestprep the answer A

Answer:

m = 2.34 kg

Explanation:

The given data shows the relation between the potential energy and the height of an object. The formula for the potential energy is given by :

E = mgh

g is the acceleration due to gravity

We have,

E = 98.61 J, h = 4.3 m

Putting all the values to find m. So,

[tex]m=\dfrac{E}{gh}\\\\m=\dfrac{98.61}{9.8\times 4.3}\\\\m=2.34\ kg[/tex]

So, the mass of the object is 2.34 kg.

Hi there!

We know that there are TWO forces acting on the man.

We can express this in an equation. Let DOWN be NEGATIVE, and UP be POSITIVE.

[tex]F_{net} = N - F_g[/tex]

Recall that a SCALE measures the NORMAL FORCE, NOT the WEIGHT. Therefore:

N = 700 N

W = 900 N

[tex]F_{net} = 700 - 900 \\\\F_{net} = -200N[/tex]

Since downward is negative, the net force is acting DOWNWARD.

When the object falls through a viscous fluid with terminal velocity the total downward force becomes equal to total upward force

[tex]\\ \rm\rightarrowtail mg=U+F_v[/tex]

[tex]\\ \rm\rightarrowtail mg=m_1g+6\pi \eta rv_T[/tex]

[tex]\\ \rm\rightarrowtail (m-m_1)g=6\pi \eta rv_T[/tex]

[tex]\\ \rm\rightarrowtail v\rho g=6\pi \eta rv_T[/tex]

[tex]\\ \rm\rightarrowtail \dfrac{4}{3}\pi r^3(\rho-\sigma)g=6\pi\eta rv_T[/tex]

[tex]\\ \rm\rightarrowtail v_T=\dfrac{4gr^2(\rho-\sigma)}{18\eta}[/tex]

[tex]\\ \rm\rightarrowtail v_T=\dfrac{2}{9}\dfrac{gr^2(\rho-\sigma)}{\eta}[/tex]

Answer:

i think its 10 or 11 not sure though if its wrong im sorry im trying to help

Explanation:

Answer:

Potential -> Kinetic -> Potential ->

Explanation:

Point A is potential becuase it's stopped (its energy isn't released). Point B is where that potential energy is released and turned into Kinetic energy. And point C is where potential energy is stored again. Same with point D.

Answer:

1(B) 2(c)

Explanation:

Answer:

The final velocity s 12 m/s.

For the upwards trajectory:   (using the positive value of g in the downward direction)

Vf = Vi - g t = 0   where Vi is initial velocity and Vf the velocity at max height

Vf = 12 - g t = 0      t = 12 / g     time to reach max height

For the downwards trajectory

Vf = Vi + g t = 0 + g t    =  g * 12 / g = 12  where t was found above

We know the from  2 g h = Vf^2 - Vi^2, since the height is the same in both directions, that the ball reaches the ground with at the same speed at which it was sent.

Also, conservation of energy shows that the ball must return to the ground with the speed with which was projected.

Answer:

light waves can travel in vacuum but sound waves require a medium to travel

also light waves are electromagnetic waves while sound waves are mechanical, light waves are transverse waves while sound waves are longitudinal waves

While sound waves are mechanical, light waves are electromagnetic. Unlike sound waves, which are longitudinal, light waves are transverse. Light waves can go across a vacuum. Since sound waves need a physical medium to move through, they cannot move in a vacuum.

The pattern of disruption brought about by the movement of energy through a medium (such as air, water, or any other liquid or solid matter) as it spreads away from the source of the sound is known as a sound wave. Pressure waves are generated by item vibrations that cause sound waves, such as those from a ringing phone.

Unlike sound waves, which need a medium to propagate, light waves may travel in a vacuum.

Additionally, light waves are transverse waves whereas sound waves are longitudinal waves and light waves are electromagnetic waves.

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Horizontal component of ball, u = 0 m/s.

Height from which it thrown, h = 62 m.

By equation of motion :

[tex]s=ut+\dfrac{at^2}{2}[/tex]

Putting all given equation, we get :

[tex]62=0\times t+\dfrac{10t^2}{2}\\\\t=\sqrt{12.4}\ s\\\\t = 3.52\ s[/tex]

Therefore, time taken is 3.52 s.

Hence, this is the required solution.

Answer:

the pressure will be 297.01 kpa

Answer:

wavelength is equal to speed over frequency

A boat in the trough of a wave takes 3 seconds to reach the highest peak of the wave, then its wavelength will be equal to 30 m.

The frequency of an event is its repetition per time unit. In a contrast to spatial frequency, it is also often referred to as temporal frequency, and in a contrast to angular frequency, it's often referred to as conventional frequency.

The standard unit is hertz (Hz), which is equal to one per second. The reciprocal of frequency is period, which itself is defined as the amount of time for one cycle of a repeating occurrence.

From the given data in the question,

Total time, t = 3s + 3s

t = 6 seconds.

Frequency, f = 1/6s

f = 0.1666 Hz

Now, let's find out the wavelength,

λ = υ/f

= 5/0.1666

λ = 30 m.

Therefore, the wavelength will be equal to 30 m.  

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Answer:

Friction is a force that acts in a direction opposite to the motion of the moving object.

Friction will cause a moving object to slow down and finally stop.

Answer:

10.2 m/s^2

a=v^2/r

Answer:

10M/S

Explanation:

DUE TO GRAVITY

Work is the application of force to move an object. It is proportional to both the force applied to the object and the distance it moves.

Net force = 96 N.

Mass m = 8 kg

Initial velocity = 6 m/s

Acceleration a = 12 m/s²

Time = 3 s

v = u + at

v = 6 + (12)(3)

v = 42 m/s

Work done = (1/2)(8)(42² - 6²)

Work done = 6,912

s = ut + (1/2)(a)(t)²

s = (6)(3) + (1/2)(12)(3)²

s = 18 + 54

Displacement (s) = 72 m

Net force = Work done / Displacement

Net force = 6,912 / 72

Net force = 96 N

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Answer:

Hello

a) the change of velocity over time

Answer:

c.the change of velocity over distance

Answer:

Radiation Released by Fission

When an atom is split, three types of radiation that can damage living tissues are released. ... Ionization is the transfer of energy to the molecules that make up tissue, breaking chemical bonds and causing damage to cells and to DNA.

Explanation:

thanks mark as brainiest,rate the answer

For an accurate design of the pendulum that will match the period, the length of the pendulum clock must be 0.25 m.

The period of oscillation of simple pendulum is calculated as follows;

[tex]T = 2\pi \sqrt{\frac{l}{g} }[/tex]

where;

Make "L" the subject of the formula in the above equation.

[tex]\frac{T}{2\pi} = \sqrt{\frac{l}{g }} \\\\\frac{T^2}{4\pi^2} = \frac{l}{g} \\\\l = \frac{gT^2}{4\pi ^2} \\\\l = \frac{(9.8)(1)^2}{4\pi ^2} \\\\l = 0.25 \ m[/tex]

Thus, the length of the pendulum clock is 0.25 m.

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Image C is a convex lens.An optical lens is made up of two spherical surfaces is convex lens.Its surfaces are curved outwards.

An optical lens is made up of two spherical surfaces is convex lens The lens is called a biconvex lens or simply convex lens if those surfaces are curved outwards.

Converging lens is another name for it. It's because it brings all the light rays that are parallel to the primary axis together at the focus point (F).

The picture created by a convex lens is always real and inverted. The produced image is virtual and erect when the item is positioned between the focus and the optical center of the lens.

Hence image C is a convex lens.

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Answer:

C

Explanation:

Answer:b

Explanation:

With the charges of the square as +2.0-nC point charge and -3.0-nC point charge, The magnitude of the electric field  is mathematically given as

Et= 14.42 N/c

Question Parameters:

A +2.0-nC point charge is placed at one corner of a square (1.5 m on a side), and a -3.0-nC charge

Generally, the equation for the electric field is mathematically given as

E = k*q1/a^2

Therefore

E1= 9*10^9*2*10^-9/1.5^2

E1= 8 N/c

For E2

E2= 9*10^9*3*10^-9/1.5^2

E2= 12 N/c

In conclusion, The magnitude of the electric field at either of the two unoccupied corners

[tex]Et = \sqrt{E1^2 + E2^2}[/tex]

Et= 14.42 N/c

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Answer:

Angle of incidence

Explanation:

When light is reflected from a surface, the angle of incidence is always equal to the angle of reflection, where both angles are measured from the path of the light to the normal to the surface at the point at which light strikes the surface. This equality is known as the law of reflection.

Answer:

400 m/s

Explanation:

If it is moving at a velocity of 80 m/s from rest, then after 5 s it would be at 400 m/s.

80 x 5 = 400

Answer: Various wavelengths emitted by an excited substance

Explanation:

Answer: joule, unit of work or energy in the International System of Units (SI); it is equal to the work done by a force of one newton acting through one metre.

Explanation:

This is a unit used to measure energy or work. One joule is the amount of energy required to produce one watt of power for one second. It's also the work done by a force equal to one newton exerted over a distance of one meter.

Hope this helps!

Answer:

1350 meters

Explanation:

this is easy

15 meters per second

90 seconds

90 * 15 = 1350