What is a valid frame of reference for observing motion if you
are riding on a bus with a friend?
a the bus driver at the front of the bus
b the wastebasket on the bus
c your friend sitting next to you
d objects like trees and houses outside the windows

Vector diagram B will result in the largest resultant vector. Correct option is B.

Vector is a mathematical quantity which has both magnitude as well as direction. Force, displacement, velocity & acceleration etc. are the examples of vectors. Vectors are denoted by a standard letter and an arrow upon it.

The resultant(R) of two vectors R1 and R2 having angle θ between them are given by,

R² = R₁² + R₂² + 2R₁R₂cosθ

A) in this diagram single vector is there,

so R = R₁

B) in this diagram two vectors are in same direction with zero angle between them. (Cos0 = 1)

R² = R₁² + R₂² + 2R₁R₂

C) & D) In these diagrams two vectors are in opposite direction with zero angle between them. (Cos180 = -1)

R² = R₁² + R₂² - 2R₁R₂

Looking at B Two vectors will be added each other and give largest resultant vector.

Hence Option B is correct.

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Sound waves are emitted from the surface of the ocean and travel through the water at 1490 m/s, with a wavelength of 15m. The frequency of the sound waves as they travel to the bottom of the ocean is 99.33Hz.

The pattern of disruption brought on by energy moving away from the sound source is known as a sound wave. Longitudinal waves are those produced by sound. This indicates that the direction of energy wave propagation and the particle vibrational propagation are parallel. The atoms oscillate when they are put into vibration. A high-pressure and a low-pressure zone are created in the medium as a result of this constant back and forth action. Compressions and rarefactions, respectively, are terms used to describe these high- and low-pressure zones. The sound waves go from one medium to another as a result of these regions being transmitted to the surrounding media.

Using the formula:

v = n×λ

where,

v is the velocity of sound wave and,

λ is the wavelength.

Substituting the values and solving for frequency:

n = 99.33Hz

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Answer:

The answer is definitely A

the answer I got was 6000Hz

Answer:

Explanation:

Given :

We need to find the frequency of the wave

Using formula:

Where,

On substituting the required values, we get:

[tex] \dashrightarrow \sf \: F = \dfrac{80}{0.3} \\ \\ \dashrightarrow \sf \: F = 266.6 \: Hz[/tex]

Therefore,

Governments assist in enhancing the infrastructure necessary for companies to flourish and helps business provide the goods and services that people need and want.

What is economics?

Economics is the study of how limited resources are used to create outputs, such as commodities and services, that are then distributed among individuals. Resources serve as the resources for creating outputs. Products and services are created by combining resources. The necessary raw ingredients are provided by land and natural resources. Raw materials are turned into finished products and services by labor.

Businesses perform better when they can effectively transport raw materials to factories and deliver finished goods to plants and markets. Governments assist in enhancing the infrastructure necessary for companies to flourish. Roads, bridges, rail lines, airports, seaports, energy transmission lines, and telecommunications networks are all included in this.

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In Maths finding the square root of a number is the opposite of squaring a number. The square root of the square of a positive number gives the original number. The Square root of 2.56 is 1.6.

The square root of a number can be defined as the factor which we can multiply by itself to get that number. The symbol used to represent the square root is √.

The square root of any number can be found out without using calculator by using long division method. Here the square root of 2.56 is 1.6. Divide, multiply, subtract, bring the next number and repeat. These are the steps of it.

√2.56 = 1.6

The long division method of 2.56 is attached here.

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The metric units with these measurements is force: Newton

Metric units are a type of measurement system based on the meter, kilogram, and second. It is the most widely used system of measurement in the world and is used by most countries. Metric units are based on a decimal system, which means that each unit is a multiple or fraction of 10, and is defined in relation to a basic unit. For example, the meter is defined as the distance traveled by light in a vacuum in 1/299,792,458 of a second. Other metric units, such as the liter, are defined as multiples of the basic unit.

distance: meter

work: joule

power: Watt

energy: joule

time: second

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Answer: Unequal heating rates of land and water

Explanation: During the day the land heats up faster, the warm air over the land rises up and the cold air from the sea blows towards the land causing a sea breeze.

Answer:

its because the modern model of our solar system is much more updated to the Ptolemy's model

Answer:

hi

Explanation:

there is the answer

hope it helps

good luck

Explanation:

If both charges are positive, the force will be positive; similarly, if both charges are negative, the force will be positive.

If one charge is positive and another is negative, the force will be negative.

The correct answer is "positive; negative". According to Coulomb's Law, the force between two charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them. The force is attractive if the charges are of opposite sign (one positive and one negative), and repulsive if the charges are of the same sign (both positive or both negative). Therefore, when one charge is positive and another is negative, the force between them is attractive, while when both charges are positive or both are negative, the force between them is repulsive.

Using Coulomb's Law, the force between two charges is given by:

F = k * q1 * q2 / r^2

Where k is Coulomb's constant (9.0 x 10^9 N*m^2/C^2), q1 and q2 are the charges, and r is the distance between the charges.

Substituting the given values, we have:

F = (9.0 x 10^9 N*m^2/C^2) * (8.0 x 10^-9 C) * (2.0 x 10^-3 C) / (0.80 m)^2

F = 36 N

Therefore, the force between the two charges is 36 N.

What is Coulomb's law?

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The refractive index of the liquid, given that the depth is 4 cm and the coin appears to be 3. 5 cm is 1.2

Refractive index is related to real depth and apparent depth according to the following formula:

Refractive index = Real depth / Apparent depth

With the above formula, we can obtain the refractive index as illustrated below:

Refractive index = Real depth / Apparent depth

Refractive index = 4.2/ 3.5

Refractive index = 1.2

Thus, the refractive index is 1.2

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The electrostatic force between the two charges will decrease in magnitude and become attractive.

What is Electrostatic Force?

Electrostatic force, also known as Coulombic force or Coulomb's law, is the force that exists between electrically charged particles, such as protons and electrons. The force is exerted by one charged particle on another and can be attractive or repulsive, depending on the types of charges involved.

The magnitude of the electrostatic force is directly proportional to the product of the charges on the particles and inversely proportional to the square of the distance between them. Mathematically, this can be expressed as F = k(q1q2)/r^2, where F is the electrostatic force, q1 and q2 are the charges on the particles, r is the distance between them, and k is the Coulomb constant.

If one of the like charges becomes oppositely charged, the electrostatic force between them will become attractive. .

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1) The wavelength of the sound wave is 11cm.

2) The frequency of the sound wave is 3118.18.

3) The length of the air column is 35.75cm.

What is frequency and its unit?

The quantity of full oscillations made by any wave element in a unit of time is known as the frequency of a sinusoidal wave. A parameter that describes the rate of oscillation and vibration is called frequency. Hertz is the SI unit for frequency. One full oscillation per second corresponds to one hertz (Hz).

Therefore, The wavelength of the sound wave is 11cm, The frequency of the sound wave is 3118.18 and The length of the air column is 35.75c

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Greater in size than that of the second star is the first star. If Chaya looks at the information for two stars. They are both the same hue, yet the first star is brighter overall than the second.

A star's absolute magnitude, M, is the magnitude it would have if it were situated 10 parsecs away from Earth. Astronomers might compare the true (intrinsic) brightness of various stars by taking into account stars at a given distance.

More powerful (or greater wattage) stars will glow brighter than less powerful ones (lower wattage). Nevertheless, that because a star appears brighter doesn't always imply it is. The brilliance of a star is also influenced by how close to us it is. An thing seems darker the further it is away.

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Answer:

V = 2 π R / T        speed V where T is period

T = 2 π R / V     = 2 π * .2 m / 1.5E5 m/s = 8.38E-6 sec

Period = 8.36 * 10-6 sec

Answer:

a yellow book

Explanation:

red has the longest wavelength so most wavelength to least wavelength goes in the order- red, orange, yellow, green, blue, indigo, violet

yellow has the longest wavelength in the gvn options thus its the answer

Answer:

The reason is that for the options above, bacteria can only grow most rapidly in the range of temperatures between ~ 40 °F and 140 °F and the reason foods like those have to be refrigerated is because meat can go rot pretty easily and there could have a lot of bacteria and things we do not want at all. But put meat in the fridge can slow down bacterial growth.

Explanation:

Well the answer toy your question is that, counter foods such as:

( The only things that are on my counter RIGHT now is the shown above.

The reason is that for the options above, bacteria can only grow most rapidly in the range of temperatures between ~ 40 °F and 140 °F

So that is why some foods like fruits can stay out.

The reason why foods like:

The reason foods like those have to be refrigerated is because meat can go rot pretty easily and there could have a lot of bacteria and things we do not want at all. But put meat in the fridge can slow down bacterial growth.

Thus the answer to your problem is:

The reason foods like those have to be refrigerated is because meat can go rot pretty easily and there could have a lot of bacteria and things we do not want at all. But put meat in the fridge can slow down bacterial growth.

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Answer:

a. time of flight = 4.285 s

b. horizontal distance reached = 214.25m

c. final velocity = 65.3m/s, at 40° downwards

Explanation:

This is a projectile motion question.

Things to note, in all projectile motion questions:

In projectile motion questions, we will use the three equations of motion:

[tex]v=u+at\\v^2=u^2+2as\\s=ut+\frac{1}{2}at^2[/tex]

Thus we can adjust our equations for the x - component:

[tex]v=u\\s=ut[/tex], since acceleration = 0

For the y - component:

[tex]v=u-gt\\v^2=u^2-2gs\\s=ut-\frac{1}{2}gt^2[/tex], since acceleration = gravity (9.8 m/s²), downwards.

Now, with our question, we can note: u(x) = 50m/s, and u(y) = 0, since, initially, only horizontal motion. Also, s(y) = - 90m.

(a) After how many seconds will it strike the plain at the foot of the cliff?

In this question, we are asked to find time of flight, 't'. As we have s(y), u(y), and g, we can use the third equation, [tex]s=ut-\frac{1}{2}gt^2[/tex] to find t.

Since u=0, thus, - 90 = -1/2×9.8×t². solving this algebraically, therefore, time of flight = 4.285 s.

(b) At what distance from the foot of the cliff will it strike?

Now, we need to find the horizontal distance or range. All we can use to do this is s = ut. Since we know that u=50m/s, and t=4.285s, this will be easy. s = (50)(4.285) = 214.25 m.

Therefore, horizontal distance reached = 214.25m.

(c) With what velocity will it strike the ground?

In this part, we need to find final velocity. Final velocity = the resultant vector of both the x and y velocity components. [tex]v=\sqrt{(v_x)^2+(v_y)^2}[/tex].

Since horizontal velocity is constant, u = v, and therefore, v(x) = 50m/s.

For vertical velocity, we can use [tex]v^2=u^2-2gs[/tex]. u(x) = 0, and s(y) = -90m.

Therefore, v² = -2(9.8)(-90). final vertical velocity is thus 42m/s.

Now final velocity = √(50² + 42²) ≈ 65.3 m/s.

Lastly, we need to remember to calculate direction, since velocity is a vector quantity. the direction of velocity (θ) [tex]=tan^{-1}(\frac{v_y}{v_x})[/tex]

Therefore, θ = 40°.

Therefore, final velocity = 65.3m/s, at 40° downwards.

Farming or agriculture by humans had great impact on the population in certain areas. Farming created a facile environment for people get into a developing life and the areas feasible for cultivation were populated more.

Human populations have frequently rebuilt their subsistence niches, altering both their food sources and living environments. For instance, most human populations changed from foraging to engaging in various forms of agriculture over the past 12,000 years.

It is well known that the transition to agriculture had an impact on a number of areas of human biology and demography, including mortality risk, population growth, adult body size, and physical indicators of health.

The reasons why populations tended to grow in size at times when indices of health declined are poorly understood since these tendencies have not been included in a comprehensive conceptual framework. All these are significant changes after the generation of an agricultural society.

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Answer:

Density of iron = 7.87 g/cm^3

Explanation:

Increasing the distance between an electromagnet and the compass will cause the observed effect of the compass to decrease in strength

The strength of the magnetic field produced by an electromagnet decreases as the distance from the electromagnet increases. This means that if the distance between the electromagnet and the compass increases, the magnetic field that the compass is experiencing will weaken.

As a result, the observed effect of the compass will decrease in strength as the distance between the electromagnet and the compass increases.

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The force required to lift the whale shark is given as 25000 N, and its acceleration is 1.25 m/s^2. We can use Newton's second law of motion, which states that the force (F) applied on an object is equal to the product of its mass (m) and acceleration (a), i.e. F = ma.

Rearranging the equation to solve for the mass, we get:

m = F/a

Substituting the given values, we get:

m = 25000 N / 1.25 m/s^2

m = 20000 kg

Therefore, the mass of the whale shark is approximately 20,000 kg.