the theory of gravity is considered to be a theory because​

Answer:

The separation of the single population (allopatric speciation) led to speciation.

Explanation:

"Speciation" refers to the evolutionary process of organisms in order to become a "distinct" species. There are several factors affecting speciation and these are: Genetic Drift, Natural Selection, Mutation and Geographic Isolation.

The situation above is an example of the factor called "Geographic Isolation."  This type of isolation is reproductive in nature. This happens when organisms are separated or divided by a barrier. In the case above, the fruit flies were divided into different cages. One cage was for fruit flies who  fed on maltose-based foods, while the other cage was for fruit flies who fed on starch-based foods.

More specifically, this case may also be referred to as "allopatric speciation." It happens when a single population is divided. Thus, over time the separated species acquire genetic differences. These differences prevent them from breeding with each other once they are reunited. This is the reason why the maltose-based flies prefer to mate only maltose-based flies as well.

Answer: Habitat isolation

Explanation: I just guessed

Answer: Health is a benefit it can reduce the risk of heart disease as well as help you control your weight. It can also help you improve your mental health and mood. It can also help keep your thinking, learning, and judgement skills sharp as you age.

Which of the following is a benefit to exericse?

A. Fight depression

B. Sleep better

C. Concentrate

D. All of the above.

Answer:

yes it is D

Explanation:

The following statements true about the force of friction is Friction acts in the direction opposite to an object's motion. The correct option is D.

When an object is moving on a rough surface, it experiences opposition. This opposing force is called the friction force.

When an object experiences force, it moves in the direction of force, but opposed due to roughness of the surface. This opposition offered is opposite to the force applied. Their directions are opposite to each other.

Thus, the correct option is D.

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Answer:

[tex]|\vec r|=339.82\ m[/tex]

[tex]\theta=-6.67^o[/tex]

Explanation:

Displacement

It's a vector magnitude that measures the space traveled by a particle between an initial and a final position. The total displacement can be obtained by adding the vectors of each individual displacement. In the case of two displacements:

[tex]\vec r=\vec r_1+\vec r_2[/tex]

Given a vector as its polar coordinates (r,\theta), the corresponding rectangular coordinates are computed with

[tex]x=rcos\theta[/tex]

[tex]y=rsin\theta[/tex]

And the vector is expressed as

[tex]\vec z=<x,y>=<rcos\theta,rsin\theta>[/tex]

The monkey first makes a displacement given by (0.198 km,0°). The angle is 0 because it goes to the East, the zero-reference for angles. Thus the first displacement is

[tex]\vec r_1=<0.198cos0^o,0.198sin0^o>=<0.198,0>\ km=<198,0>\ m[/tex]

The second move is (145 m , -15.8°). The angle is negative because it points South of East. The second displacement is

[tex]\vec r_2=<145cos(-15.8^o),145sin(-15.8^o)>=<139.52,-39.48>\ m[/tex]

The total displacement is

[tex]\vec r=<198,0>\ m+<139.52,-39.48>\ m[/tex]

[tex]\vec r=<337.52,-39.48>\ m[/tex]

In (magnitude,angle) form:

[tex]|\vec r|=\sqrt{337.52^2+(-39.48)^2}=339.82\ m[/tex]

[tex]\boxed{|\vec r|=339.82\ m}[/tex]

[tex]\displaystyle tan\theta=\frac{-39.48}{337.52}=-0.1169[/tex]

[tex]\boxed{\theta=-6.67^o}[/tex]

Answer:

a.25J b.6J c.6J d.31J e.[tex]\sqrt{31}[/tex] m/s

Explanation:

a. using the formula Ek=1/2mv^2, the kinetic energy would be 1/2*2*5^2=25J

b. we can separate the work the child applied. So the work he/she applied would be 2*3=6J (W=FS)

c. by the "Energy conservation law", we knew the energy can be "add up" since they wouldn't "disappear". Thus, the change in the car’s kinetic energy is 6J.

d.25+6=31J

e.now you know the new Ek, and the m, just use the formula again! 31=1/2*2*v^2. So the velocity after the child push it would be [tex]\sqrt{31}[/tex] m/s

The kinetic energy and the work done by the car is:

(a) 25 J

(b) 6 J

(c) 6 J

(d) 31 J

(e) 5.57 m/s

According to the question,

Force,

Distance,

(a)

The Kinetic energy of the car will be:

→ [tex]K_i = \frac{1}{2} mv_0^2[/tex]

       [tex]= \frac{1}{2}\times (2)\times (5)^2[/tex]

       [tex]= 25 \ J[/tex]

(b)

The work done by the car will be:

→ [tex]W = fd[/tex]  

       [tex]= 3\times 2[/tex]

       [tex]= 6 \ J[/tex]

(c)

The change in the car's K.E will be:

→ [tex]\Delta K = W[/tex]

          [tex]= 6 \ J[/tex]

(d)

The car's final K.E will be:

→ [tex]K_f = W+K_i[/tex]

        [tex]= 6+25[/tex]

        [tex]= 31 \ J[/tex]

(e)

The final velocity of the car will be:

→ [tex]v_f = \sqrt{\frac{2 K_f}{m}}[/tex]

       [tex]= \sqrt{\frac{2\times 31}{2} }[/tex]

       [tex]= 5.57 \ m/s[/tex]

Thus the above solution is correct.

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Answer: v= 5 m/s

Explanation: Solution:

KE= 1/2 mv²

Derive to find v.

v = √ 2KE / m

Substitute the values

v = √2x 625 J / 50 kg

= √ 1250 J / 50 kg

= √ 25 kg. m/s /kg

= 5 m/s

Unit for J can be expressed in kg.m/s so we cancel kg and the remaining unit is m/s.

Answer:

There are two possibilities:

According to 1st possibility :

If the bodies are in touch then the temperature of hot body decreases and the temperature of cold body increases due to heat transfer and at a point the temperature of two bodies becomes equal.

According to 2nd possibility:

There will not be change in the temperature of two bodies. There will not heat transfer here.

Note: Heat transfers from hot body to cold body.

Hope it helps :)

Two bodies, one hot and one cold are kept in a vacuum the temp of hot bodies may decrease or remain unchanged.

Two possible conditions for temperature change.

If two bodies are in contact then the temperature of the higher body will decrease.

If two body is not in conduct, heat cannot be transferred so the temperature cannot change.

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Roller coasters convert potential energy into kinetic energy as they go downhill due to gravity which increases their speed. This kinetic energy is converted back into potential energy as they go uphill and slow down. This cycle continues until friction and air resistance slow the roller coaster down.

Roller coasters are an exciting way to experience the conversion of potential energy to kinetic energy and back again. Let's break down this concept in simpler terms.

1. The roller coaster car starts with a high potential energy at the starting point, usually at the top of a hill. The car gets this energy from the work done by the machines that lift it up to this starting height.

2. As the roller coaster starts to move down the slope, this potential energy begins to convert into kinetic energy. The potential energy decreases while the kinetic energy increases - this is due to the car's increased speed due to gravity pulling it downhill.

3. At the lowest point of the track, the car has the maximum kinetic energy and minimum potential energy.

4. When the car again starts to climb up another smaller hill, the kinetic energy is converted back into potential energy as the car slows down and gains height.

5. In a frictionless situation, this process would continue without end. However, in reality, some energy is lost due to friction and air resistance, and that's why roller coasters eventually come to a stop.

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The kinetic energy of the car is calculated using the formula KE = 1/2 * m * v^2, where m is mass and v is velocity. Substituting the given values yields a kinetic energy of 100,000 Joules for the car.

The kinetic energy of an object can be calculated using the formula: KE = 1/2 * m * v^2, where 'm' stands for mass and 'v' stands for velocity. In this scenario, the mass (m) of the car is 2,000 kg and the velocity (v) is 10 m/s. Plugging these values into the formula we get: KE = 1/2 * 2000 kg * (10 m/s)^2. Therefore, the kinetic energy of the car is 100,000 Joules.

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Answer:

8m/s2

Explanation:

Force = m x a

a = force/mass

= 16/2

= 8m/s2

The wavelength of the wave does not affect the speed of wave. Therefore, the given statement is false.

Wavelength can be described as the distance between identical points or adjacent crests in the adjacent cycles of a waveform propagated in space.

Wavelength can be defined as an inversely related to frequency, which denotes to the number of wave cycles per second. The higher the frequency of wave, the shorter will be its wavelength.

The change in amplitude of the sound wave does not affect its speed. The speed of sound affects by the properties of the medium through which it is traveling.

Changing the wavelength of the sound wave has no effect on the speed of sound. As the distance from the source will increase, the amplitude of the sound wave decreases. The speed of sound depends on the density or nature of the medium.

Therefore, the speed of sound wave can only be changed by changing the medium.

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Final answer:

The claim that increasing the wavelength changes the speed of a sound wave is false, as sound speed is determined by the medium and the relationship between frequency and wavelength, not by the wavelength alone.

Explanation:

The statement 'You can change the speed of a sound wave by increasing the wavelength' is false. The speed of sound (v) is determined by the medium through which it travels and is expressed by the formula v = fλ, where f is the frequency and λ is the wavelength.

Since frequency (f) is determined by the source and remains constant when sound moves from one medium to another, if the speed of the wave (v) changes due to changing medium, the wavelength (λ) must correspondingly adjust to maintain this relationship. Hence, the only way to change the speed of sound is by changing the medium, not by directly altering the wavelength.

Explanation:

Work = force × displacement

532 J = 48 N × d

d ≈ 11 m

Answer:

Explanation:

Given:

Mass of the object = [tex]40[/tex] pound

We have to calculate force (N).

Newton = [kg.ms^-2]=[MLT^-2]

So we have to convert the units.

[tex]1[/tex] pound = [tex]0.45[/tex] kg

[tex]40[/tex] pound = [tex]0.45\times 40 = 18.14[/tex] kg

Here Force and Weight are equivalent as the object is in stationary state.

Weight= product of mass and gravity.

Value of g = 9.8 ms^-2

Force = [tex]m\times g[/tex]

So the force of the object in (N) = [tex]18.4\times 9.8[/tex]

                                                     = [tex]177.77\ N[/tex]

The force in units of Newtons = 177.77

Answer:

moving or tending to move toward a center.

Explanation:

the force that is necessary to keep an object moving in a curved path and that is directed inward toward the center of rotation a string on the end of which a stone is whirled about exerts centripetal force on the stone — compare centrifugal force.

Answer: center-seeking

Explanation: a p e x

Answer: a= fnet/m

Explanation:

a = (v - u)/t

It is the formula for finding acceleration

Answer:

It is C, undergoes the most change.

Explanation:

Horizon O forms at the surface due to the accumulation of organic material

Horizon A is mineral rich and forms due to decomposed organic material from above

Horizon B undergoes the most change and no longer resembles parent material

Horizon C features parent material and is barley affected by the soil formation process

Edg2020 notes :)

Answer:

4m/s², 2m/s²

Explanation:

F = 12 N

m = 3kg

a = ?

F = ma

a = F/m = 12/3 = 4 m/s²

when m = 6kg

a = F/m = 12/6 = 2 m/s²

Using Newton's second law, the acceleration for a 3 kg object with a 12 N net force is 4 m/s^2, while for a 6 kg object it is 2 m/s^2.

The acceleration of an object with a mass of 3 kg or 6 kg can be determined using Newton's second law of motion., which can be stated as: The acceleration (a) of an object is equal to the net force (F) applied divided by the mass (m) of the object, which can be written as a = F/m. In your problem, with a 12 N net force, for a 3 kg object, the acceleration would be 4 m/s^2 (12 N / 3 kg), while for a 6 kg object, it would be 2 m/s^2 (12 N / 6 kg).

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Answer:

4800N

Explanation:

F=GmM/r^2

F=infinite m

F=2F

=2(2400N)

=4800N

Answer:4800 N

Explanation: you just multiply

Answer:

D: chromosomes fail to separate properly during meiosis

Explanation:

Answer:

O B. when the angle between the force and displacement is 90°

Explanation:

All options provided (deforestation, pollution, loss of natural resources, and decrease in water quality) are possible environmental consequences of urban sprawl, making the correct answer 'none of the above'.

The question, "Which of the following is not a possible environmental consequence of urban sprawl?" explores the impact of urban sprawl on the environment. Urban sprawl, which refers to the spread of a city and its suburbs over more and more rural land at the periphery, leads to several negative environmental impacts. These include deforestation, as forests are cleared to make way for new developments; pollution, both from increased vehicle emissions and construction activities; loss of natural resources, as land that could be used for agriculture or that serves as natural habitats is consumed for development; and a decrease in water quality, due to increased runoff and pollution entering water bodies. Therefore, the correct answer to this question is E) none of the above, as all the options listed are potential consequences of urban sprawl.

Answer:

D

Explanation:

If someone has to find the direction of the magnetic field lines, they would have to keep a compass near it, then it's north pole would show the direction.

Thank you. If u have further inquiries feel free to ask me.

I hope u will follow me and make this the brainliest.

With love,

Joel

The best description of a magnetic field line is option D. A magnetic field line shows the direction a compass needle would point.

⇒ Magnetic subject traces do not intersect each other.

⇒  They emerge from the north pole and merge/end at the south pole.

⇒ They flow from the north pole to the south pole outdoor the fabric and from the south pole to the north pole within a material.

⇒these lines formed are cl

osed curves.

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The number of energy levels increases as you move down a group as the number of electrons increases

Explanation:

The determination of distance of separation between the two nuclei of likely atoms connected together called atomic radius. This in a group usually increases from top to bottom. With the increase in the atomic number in the group, the positive nuclear charge increases again. However, the amount of principle energy is also increasing.

High principle energy levels made up of orbits of higher size than low energy levels. The impact of this exceeds the increased nuclear charge, and thus the atomic radius gets increased when going down a group in the periodic tables.

Atomic radius gradually decreases from the side left to the right during the elemental period. This is because all electrons of the same size are added over time or in a family of elements.

Answer:

Literally, the Atomic radius of a chemical element is a term used to describe the size of an atom.

Atomic radius can be regarded as a measure of the size of its atoms. This is often characterized by the mean or typical distance of the chemical element from the center of the nucleus to the boundary of the surrounding shells of electrons.

In general, the size of an atom will decrease as you move from left to the right of a certain period

Periodic Trends of Atomic Radius. An atom gets larger as the number of electronic shells increase; therefore the radius of atoms increases as you go down a certain group in the periodic table of elements.

Answer:0.2m/s^2

Explanation: newton's first law of motion: F=ma. Fnet=applied force-frictional force. Therefore, Fnet=ma. Make "a" the subject of the formula which will result a=(Fappl-Frict)m.

Therefore a=(25-5)N/100kg

a= 20/100

a= 0.2m/s^2

A boat's motor exerts 25 N of force, while viscous friction exerts 5 N. The boat's acceleration is 0.2m/s² if it weighs 100 kg.

Therefore a = (25-5)N/100kg

a = 20/100

a = 0.2m/s²

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Answer:The commonly used unit for the number of oscillations per second is the Hertz, so that this same pendulum is said to have a frequency of 2 Hertz, or 2 Hz. A third measure of oscillatory motion is the maximum distance of travel of the oscillator. This is called its amplitude.

Explanation:

The number of complete oscillations of a wave per second is known as frequency. It is measured in hertz (Hz). To calculate frequency, divide the number of cycles by the time they occur in, with the relationship between frequency and period (T) being inversely proportional.

The number of complete oscillations of a wave per second is referred to as the frequency of the wave. The unit of measurement for frequency is the hertz (Hz), where 1 Hz equals one cycle per second. The frequency (f) of a wave is calculated by dividing the number of complete wave cycles by the time duration (At) in which these cycles occur. If a mass attached to a spring completes 50 full cycles in 30 seconds, to find the frequency, one would divide 50 by 30, resulting in a frequency of approximately 1.67 Hz.

The relationship between frequency and the period (T) of a wave is inversely proportional, meaning as the period (the time it takes for one complete oscillation) increases, the frequency decreases, and vice versa. This relationship is mathematically represented as f = 1/T. Frequency offers a measure of how fast a wave oscillates in terms of the number of cycles per second, while the period represents the duration of one complete cycle.

Answer:

I calculated the mechanical advantage. It is in the picture above

but I haven't gotten the weight but I know the general formula of weight 2 be m×g (mass ×gravity) I will get back 2 u once I solve it plz don't be offended and plz Mark me brainliest answer

Juan uses a lever to lift a rock. The weight of the rock can be calculated by multiplying the force applied on the lever arm by the mechanical advantage of the lever. The mechanical advantage is calculated by dividing the length of the effort arm by the length of the resistance arm.

In this question, Juan uses a lever to lift a rock. He applies a force of 30 N over a distance of 1 m on one arm of the lever. The other end of the lever moves in the opposite direction and raises the rock a distance of 0.2 m.

To find the weight (force) of the rock, we can use the principle of moments. The weight of the rock can be calculated by multiplying the force applied on the lever arm by the mechanical advantage of the lever.

The mechanical advantage of a lever is calculated by dividing the length of the effort arm by the length of the resistance arm. In this case, the length of the effort arm is 1 m and the length of the resistance arm is 0.2 m, so the mechanical advantage is 1/0.2 = 5.

Therefore, the weight of the rock is 30 N * 5 = 150 N.

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The moment of inertia of the barbell can be calculated by treating the weights as point masses using the formula I = 2mR², and the moment of inertia for the rod using the formula I = (1/12) × M × L². Add these together for the total moment of inertia.

The student’s question concerns the calculation of the moment of inertia of a weightlifter's barbell through an axis perpendicular to the rod at its center. Given that the barbell consists of two spherical weights, each with a mass of 50 kg and connected by a 0.96-m rod with a mass of 24 kg, we can use the formula I = 2mR² to find the moment of inertia assuming the masses can be treated as point masses.

The distance R from each weight to the center axis is half the length of the rod, which is 0.96 m / 2 = 0.48 m. Therefore, the moment of inertia for the two weights would be:

I₁ = 2 × 50 kg × (0.48 m)²

Separately, the moment of inertia for the rod can be calculated with the formula I = (1/12) × M × L², where M is the mass and L is the length of the rod. For the 0.96-m rod having a mass of 24 kg, the calculation would be:

I₂ = (1/12) × 24 kg × (0.96 m)²

To find the total moment of inertia for the entire barbell, we combine the moments of inertia of the weights (I₁) and the rod (I₂).

Answer: [tex]72.66 AU=1.089(10)^{10} km[/tex]

Explanation:

Let's begin by explaining that according to Kepler’s Third Law of Planetary motion “The square of the orbital period [tex]T[/tex] of a planet is proportional to the cube of the semi-major axis [tex]a[/tex] of its orbit”:

[tex]T^{2}\propto a^{3}[/tex] (1)  

Now, if [tex]T[/tex] is measured in years (Earth years), and [tex]a[/tex] is measured in astronomical units (equivalent to the distance between the Sun and the Earth: [tex]1AU=1.5(10)^{8}km[/tex]), equation (1) becomes:  

[tex]T^{2}=a^{3}[/tex] (2)  

So, knowing [tex]T=619.36 years[/tex] and isolating [tex]a[/tex] from (2) we have:  

[tex]a=\sqrt[3]{T^{2}}[/tex] (3)  

[tex]a=\sqrt[3]{(619.36 years)^{2}}[/tex] (4)  

Finally:

[tex]a=72.66 AU[/tex] T his is the distance between the dwarf planet and the Sun in astronomical units

Converting this to kilometers, we have:

[tex]a=72.66 AU \frac{1.5(10)^{8}km}{1 AU}=1.089(10)^{10} km[/tex]

Answer:

An object gets charged when it's atoms lose or gain an electron to become an ion. For example: ... This means that the fur loses it's electrons to the plastic rod and both objects are now charged. The fur is positively charged because it lost electrons and the rod is negatively charged because it gained electrons

Explanation:

comment how it helps

Answer:

An object becomes charged when it loses or gains electrons.

Explanation:

There are three ways to charge an object:

1)friction,

2)conduction

3)induction.

1) Friction involves rubbing on material with another, resulting in electrons moving from one surface to another.

2)Conduction on the other hand is used to charge things that are good conductors, such a metal.

3)The final way to charge an object is by induction and is, again, best for conductive materials.

Answer:

5 cm

Explanation:

Centripetal force varies directly with mass and the square of velocity, and inversely with radius.  If k is the constant of proportionality:

F = k m v² / r

When m = 7 g, v = 20 cm/s, and r = 25 cm, then F = 112 dynes.  Solving for k:

112 = k (7) (20)² / 25

k = 1

When m = 17 g, v = 40 cm/s, and F = 5440 dynes:

5440 = 1 (17) (40)² / r

r = 5

The radius is 5 cm.

The radius of the circle is 5 cm.

The rate at which a body's displacement changes in relation to time is known as its velocity. Velocity is a vector quantity with both magnitude and direction. SI unit of velocity is meter/second.

Given that: The centripetal force of an object moving in a circle varies jointly with the mass of the object and the square of its velocity and

inversely as the radius of the circle.

So, F ∝ mv²/r

F = kmv²/r.

In first case:

Mass of the object; m = 7 gram.

Radius of the circle; r = 25 cm.

Velocity of the object : v =20 cm/s.

And centripetal force: F = 112 dyne.

So, 112 = k 7×20²/25

⇒ k = 1.

In second case:

Mass of the object; m = 17 gram.

Velocity of the object : v =40 cm/s.

And centripetal force: F = 5440 dyne.

Radius of the circle; r =?

So, 5440 = 1×17 ×40²/r

⇒ r = 5 cm.

Hence  the radius of the circle is 5 cm.

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