PLEASE HELP !!

Elements in period 2 on the periodic table all have blank
electron shells.

The maximum height to which the cricket ball rose is 32 meters. The time taken for the ball to reach the maximum height is given as t/2 = 1.6/2 = 0.8 s.

The vertical velocity of the ball at the maximum height is zero (u = ? , v = 0). The vertical acceleration of the ball is given by g = -9.8 m/s².

As per the equation of motion, H \(= ut + 1/2 * a * t²\)

Using the above equation, we can find the maximum height to which the ball rose. Therefore, substituting the values in the above equation, we get;

H = 0 + 1/2 * 9.8 * (0.8)²H

= 3.136 m

Also, the time taken for the ball to reach the ground after it is thrown is given by the equation, H \(= ut + 1/2 * a * t²\)

Using the above equation, we can find the maximum height to which the ball rose. Therefore, substituting the values in the above equation, we get;

0 = 0 + 1/2 * 9.8 * t²t

= 2 s

The total time for the ball to travel from the hand of the cricketer to the hands of the team-mate is given as 1.6 s.

Therefore, the ball is in the air for 2 - 1.6 = 0.4 s when it is travelling downwards. Thus, we can find the total distance travelled by the ball as follows, S \(= ut + 1/2 * a * t²\)

Using the above equation, we can find the maximum height to which the ball rose. Therefore, substituting the values in the above equation, we get; S = 0 + 1/2 * (-9.8) * (0.4)²S

= -0.784 m

Therefore, the maximum height to which the cricket ball rose is 32 meters (approx).

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A baseball is thrown vertically upward and feels no air resistance. As it is rising its momentum is not conserved, but its mechanical energy is conserved.

Momentum may be defined as a unique property of a moving body that the body has by virtue of its mass and motion and that is equal to the product of the body's mass and velocity.

According to the context of this question, as an object typically moves along the vertical direction, the gravitational potential energy, and the kinetic energy change. So, due to this, its momentum is not conserved, but its mechanical energy is conserved.

Therefore, a baseball is thrown vertically upward and feels no air resistance. As it is rising its momentum is not conserved, but its mechanical energy is conserved.

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The magnitude of the weight of the cube can be expressed as follows:
W = m*g
Where W is the weight, m is the mass, and g is the acceleration due to gravity.
The mass of the cube can be found using the formula:
m = rho*V
Where rho is the density, and V is the volume.

The volume of the cube can be found using the formula:
V = l^3
Where l is the length of one side of the cube.
Substituting the expression for V into the equation for m, we get:
m = rho*l^3
Now, substituting the expression for m into the equation for W, we get:
W = (rho*l^3)*g
Therefore, the expression for the magnitude of the weight of the cube, in terms of rhoc, l, and the acceleration due to gravity, g, is:
W = rhoc*l^3*g

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Answer: the cube will proble sink

but the pink will float

According to the resistance, the resistivity of wire material is 1.37 x 10¯⁷ Ωm.

We need to know about the resistance of conductive material to solve this problem. Resistance can be defined as the ratio of the voltage applied to current flow It can be written as

R = V / I

where R is resistance, V is voltage and I is current.

The resistance of the material depends on its resistivity and follows this equation

R = ρ . L / A

where ρ is resistivity, L is the length of the material and A is the surface.

From the question above, we know that

V = 4.5 V

L = 2.5 m

r = 0.654 mm = 6.54 x 10¯⁴ m

I = 17.6 A

Find the surface area

A = π . r²

A = π . ( 6.54 x 10¯⁴ )²

A = 1.34 x 10¯⁶ m²

Find the resistivity of the wire

R = V / I

ρ . 2.5 / (1.34 x 10¯⁶)= 4.5 / 17.6

ρ = 1.37 x 10¯⁷ Ωm

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The kinematics to find the time to go from the office to the living room is: 2.81 s

Given Parameters

To find

Kinematics allows us to find the relationships between the position, velocity and acceleration of bodies, let's use the relationship  

             x = v₀ t + ½ a t²

Where x is the position, v₀ the initial velocity, at acceleration and t the time

In this case, as he leaves the office, the initial velocity is zero.

           x = ½ a t²

            t = \(\sqrt{\frac{2x}{a} }\)

Let's calculate

           t = \(\sqrt{\frac{2 \ 125}{4} }\)

          t = 2.81 s

In conclusion, using the kinematics, we find that the time to go from the office to the classroom is: 2.81 s

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Answer: Traveling wave

Explanation:

A Gaussian surface contains a single charge within it, and as a result, electric flux passes through the surface. Suppose the charge is then moved to another spot within the Gaussian surface.

The flux through the surface does not change. The flux through a closed surface depends only on the net charge enclosed by the surface. Moving the charge to another spot within the Gaussian surface does not change the net charge enclosed, hence the flux through the surface remains the same. A Gaussian surface is a conceptual device in electromagnetism used to calculate electric fields. A Gaussian surface is a closed surface in three-dimensional space through which the electric flux passes. The net electric flux through the surface is used to calculate the electric charge enclosed within the surface.

A Gaussian surface is also known as a Gaussian control volume electric flux is a scalar quantity that represents the amount of electric field passing through a surface. Electric flux is denoted by the symbol phi, and it is defined as the product of the electric field and the area of the surface it passes through. The electric flux is proportional to the amount of electric charge enclosed by the surface.

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The highest entropy for the jar of marbles is represented by the marbles are arranged in a random order.

Entropy is the measure of the degree of disorderliness of a system or degree of randomness of a system.

Entropy of a system increases with increase in randomness of the system or disorderliness of the system.

Thus, the highest entropy for the jar of marbles is represented by the marbles are arranged in a random order.

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A collection of voltaic cells (or piles) is called a battery.

What are voltaic cells?

Voltaic cells are chemical cells that generate electricity.

A series of voltaic cells connected together in a steel container which produce current as a result of oxidation reduction reaction.

In a voltaic cell there are two compartments where oxidation and reduction occurs simultaneously to produce current.

In each compartment there is an electron. The positively charged electrode is cathode(reduction) and negatively charged in anode (oxidation).

In general, the steel container in which a redox reaction occurs inside a voltaic cell is called a battery.

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The region of space in which the potential due to a uniformly charged sphere is equal to that of a point charge is outside the sphere. That is the main answer to the question.

Let's have an explanation for the same. For any uniformly charged sphere, the potential inside the sphere is not equal to that of a point charge because the distribution of charge is not the same throughout the sphere. Hence, the electric field and potential within the sphere are different from those of a point charge.However, outside the sphere, the potential due to a uniformly charged sphere is equal to that of a point charge. The reason behind this is that outside the sphere, the distribution of charge on the sphere is equivalent to a point charge placed at the center of the sphere, which is also the center of the potential.

This can be explained as follows: For a uniformly charged sphere, the potential at a point P at a distance r from the center of the sphere is given by;V = kQ/r, where k is Coulomb's constant, Q is the total charge on the sphere, and r is the distance of the point P from the center of the sphere.When we consider a point charge at the center of the sphere, the potential at a point P at a distance r from the center of the sphere is given by;V = kq/r, where q is the charge on the point charge. Therefore, for the potential to be the same, we must have kQ/r = kq/r, which implies Q = q.This is why the potential due to a uniformly charged sphere is equal to that of a point charge outside the sphere. This long answer contains more than 100 words.

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The correct option is A. The source of information could be biased.

The scientist's conclusion is most likely unreliable because the sample used for the investigation is not representative or diverse enough to draw a generalized conclusion about the beliefs of the entire population.

Interviewing only 50 people who work in the local oil mine introduces a potential bias, as those individuals may have a vested interest in downplaying the impact of the mine on bird population decline.

Additionally, the sample size is relatively small, which reduces the statistical reliability of the conclusion.

To obtain a more accurate and reliable conclusion, a larger and more diverse sample should be used, including individuals from various backgrounds and perspectives, along with other data collection methods such as field surveys or scientific studies.

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Answer:

The uniy which is accepted all over the world is called SI unit.

Explanation:

The system of measurement that is agreed by the international convention if scientists that is held in paris of France to adopt an international unit is called SI unit unit.

Answer:

the density is 2

Explanation:

p= m/v

p is density

m is mass

v is volume

6/3 = 2

Answer:

11772 N

Explanation:

\(\boxed{w = mg}\)

w= weight

m= mass

g= acceleration due to gravity

The acceleration due to gravity on earth is 9.81m/s².

Substitute m= 1200 and g= 9.81 into the formula:

w= 1200(9.81)

w= 11772 N

To calculate the wavelength (λ2) of visible light with a frequency (f2) of 5.25×10¹⁴ Hz, we'll use the formula:

c = λ × f

where c is the speed of light (approximately 3.0×10⁸ m/s), λ is the wavelength, and f is the frequency.
First, rearrange the formula to solve for λ:
λ = c / f

Next, plug in the values for c and f2:

λ2 = (3.0×10⁸ m/s) / (5.25×10¹⁴ Hz)

Now, calculate λ2:
λ2 ≈ 5.71×10⁻⁷ m
So, the wavelength (λ2) of visible light with a frequency (f2) of 5.25×10¹⁴ Hz is approximately 5.71×10⁻⁷ meters.

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The acceleration of the car and the time required to reach this speed will be 8 m/s² and 10 sec.

The rate of velocity change concerning time is known as acceleration.

Given data;

Initial velocity, u=0  m/s

Final velocity, v= 80 m/sec

Distance travelled,s =900m

From Newton's third equation of motion;

v²=u²+2as

a =(v²-u²)/2s

Substitute the given values;

a = (80²-0)/2 ×900

a = 6400/1800

a=8 m/s²

The time required to reach this speed is found in Newton's first equation of motion as;

v = u+at

Substitute the given values;

80 = 0 + 8t

t=80/8

t = 10 sec

Hence, the acceleration of the car and the time required to reach this speed will be 8 m/s² and 10 sec.

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Answer:

To find the resulting velocity when the two asteroids stick together, we can use the principle of conservation of momentum.

The initial momentum of the first asteroid before the collision is given by the product of its mass (m1) and its velocity (v1):

Initial momentum of asteroid 1 = m1 * v1

Since the second asteroid is stationary, its initial momentum is zero.

After the collision, the two asteroids stick together and move with a common velocity (v2). The total mass of the system after the collision is the sum of the masses of the two asteroids (m1 + m2).

According to the conservation of momentum, the initial momentum of the system is equal to the final momentum of the system:

Initial momentum = Final momentum

m1 * v1 + 0 = (m1 + m2) * v2

Given:

m1 = m2 = 4723 kg

v1 = initial velocity of the first asteroid (unknown)

v2 = final velocity of the combined asteroids (unknown)

We can substitute these values into the equation and solve for v2:

4723 kg * v1 + 0 = (4723 kg + 4723 kg) * v2

4723 kg * v1 = 9446 kg * v2

Dividing both sides by 9446 kg:

v1 = 2 * v2

Therefore, the initial velocity of the first asteroid (v1) is twice the final velocity of the combined asteroids (v2).

Since the initial velocity of the first asteroid is not given, we cannot determine the resulting velocity (v2) without additional information.

A uniform accelerated linear motion happens, when a ball is dropped from a certain amount of height.

After solving, we come to know that the water balloon that is dropped by the student 10 meters above the ground, will hit the ground after 1.0s of falling (in 1.4 s).

Which equation is used to describe motion over time for a ball falling from a certain height?

To find the time we need to use the equation that is related the time with the height and the acceleration due to gravity, that is to say, the first equation from the two given, but in the vertical direction:

yf=y0+v0t+1/2at² (1)

Where:

yf : is the final height = 0

yo: is the initial height = 10 m

vo: is the initial velociy = 0 (it is dropped)          

a: is the acceleration due to gravity = -9.8 m/s² (it is negative because its direction of motion is downward)

t: is the time =?  

Solving equation (1) for t, we have:

0=10m-1/2gt²

t=√2×10m/9.8m/s =1.4s

Therefore, the balloon will hit the ground after 1.0s of falling.

Main answer is :

We used the first given equation but in the y-direction, because the equation x=x₀+v₀t+(1/2)at², considers a motion in the horizontal direction, and the ball is falling (y-direction).

We did not use the other equation (v = v₀ + at) because we do not know the final velocity of the ball before it hits the ground (v).

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Answer:

on

Explanation:

when someone runs their hand is not really balanced when they wrote something

If a  student rolls a ball along the floor so that the ball has a speed of 16 m / s , then the speed of the ball relative to a second student would be 10 m / s if the student is running at 6 m / s in the same direction that the ball is rolling.

The total displacement covered by any object per unit of time is known as velocity.

If a student rolls a ball across the floor at a speed of 16 meters per second, the ball's speed in relation to a second student would be 10 meters per second if the second student is sprinting at a speed of 6 meters per second in the same direction as the ball is rolling.

Thus, the relative speed of the ball with respect to the student would be 10 m / s.

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Answer: B. Only the mass of the planet

Explanation:

the confusion on the concepts of mass and weight arises from the fact that the acceleration due to gravity is more or less constant in any place on the Earth's surface, thus the weight of an object is directly proportional to its mass. hope it helps <3

Answer:

The three forms of water are gas, liquid, and ice, I'm not sure if these were mentioned in the passage since you did not attach a picture.

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The resistance of the electric heating element can be determined using Ohm's law, which states that resistance (R) is equal to voltage (V) divided by current (I). In this case, the voltage across the element is given as 232 volts and the current flowing through it is 19 amperes. The correct option is 12 ohms.

Applying Ohm's law, we calculate the resistance as:

R = V / I

R = 232 volts / 19 amperes

R ≈ 12 ohms

Therefore, the resistance of the element is approximately 12 ohms. This means that for every ampere of current flowing through the element, there is a voltage drop of 12 volts. The resistance value of 12 ohms indicates that the element has a moderate level of electrical resistance, which allows it to generate heat efficiently when current flows through it. Thus, the correct option is 12 ohms.

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According to the given statement:

a)It take time to reach the ground is 3.69 s.

b)The helicopter when the package lands far above the ground is 144.18 m.

Constant speed refers to a speed that remains constant throughout the duration of the motion. Constant speed is demonstrated in our example of using cruise control while driving a car.

Using this formula:

t= √(h/g)  

h= 125m

g= 9.2 m/s

t = √(125/9.2)

t = √13.59

t= 3.69 s

The package must touch the ground in 3.69 seconds.

From equation of motion  s = u t + 1/2 a t².

Here a= 0, then s= ut

s= 5.2x 3.69 = 19.18 m.

Total height = 19.18 + 125 = 144.18 m.

Helicopter is 144.18m far above from the ground when the package lands.

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Answer:

Radius 20 m.

Explanation:

Given:

aₙ = 1.4 m/s²

V = 5.3 m/s

___________

R - ?

Centripetal acceleration:

aₙ = V² / R

Radius:

R = V² / aₙ

R = 5.3² / 1.4 ≈ 20 m

The initial Ecell for the given voltaic cell is approximately 0.0263 V.

The rearranged calculation for the initial cell potential (Ecell) is as follows:

Given:

[Ni2+] = 0.80 M

[Co2+] = 0.20 M

E°cell = -0.26 V (Ni2+ reduction) - (-0.28 V) (Co2+ reduction) = 0.02 V

n = 2 (number of electrons involved)

F = Faraday constant = 96485 C mol^-1

R = gas constant = 8.314 J mol^-1 K^-1

T = temperature in kelvins = 298.15 K

Q = [Ni2+]³[Co2+]/(1)² = 0.80³ * 0.20 = 0.256

Ecell = E°cell - (RT/nF)lnQ

Ecell = 0.02 V - (8.314 * 298.15 / (2 * 96485)) ln(0.256)

Ecell ≈ 0.02 V - 0.0063

Ecell ≈ 0.0263 V

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