Why do you suppose the modern horse has a longer foot than its ancestors?
A) allowed it to swim faster
B) allowed it to reach higher trees
C) allowed for greater chance of mating
D) allowed greater speed to outrun predators

What are the choices to pick from? : )

Answer:

C. X: Allows current to flow into the commutator

Y: Conducts current to the armature and reverses direction of current

Explanation:

Carbon brush is a motor brush that acts as the conducting block  for current between the stator and the rotor of a motor.It is made of carbon blocks.The brush is held in place using a spring that ensures its contact position with the commutator.The commutator prevents the torque on the motor from reversing whenever the coil is rotating in the magnetic field.

Answer:

C

Explanation:

im smart

Loss of soil not protected by plant cover can be caused by erosion, pollution, and overuse/improper farming practices.

Loss of soil that is not protected by plant cover can be caused by various factors:

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radiation since the suns rays are ultraviolet which is a form of radiation

Heat transfer from the Sun to the Moon is mostly through the process of Radiation.

Explanation:

In space, the heat is being transferred through the process of radiation. There is no atmosphere in the moon so it will get heat or cool by the process of conduction or convection.

In space, heat gets transferred by radiation which mainly takes place in the infrared band of electromagnetic waves. Radiation can transmit heat by the electromagnetic wave. It can take the heat transfer process in the vacuum.

Answer:

Its a ceramic

Explanation:

Brick does not contain any metal so it couldnt be an alloy.

Answer:

Brick is a ceramic

Explanation:

Alloy is a metal made up by combining two or more metallic elements. for example, bronze is made up by alloying tin with copper. Ceramic materials is an inorganic,non metallic which is often crystalline oxide,nitride or carbide material. For example, Tiles are made up of natural clay sand and water.

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Explanation:

Lamarck's theory of evolution, also called as theory of inheritance of acquired traits was rejected because he suggested that the acquired characteristics which an organisms acquires through its life experiences are transferred to its next generation, which is not possible since acquired characters does not bring any change to an individuals set of genes.

Answer: Traits acquired during a lifetime are not passed through offspring. (C.)

The period of Neptune is 165 years if the semi-major axis is 30.11 using the given formula.

Answer: Option D

Explanation:

The period of any planet revolutions around the sun can be determined using Kepler third law. As that law states that square to the period of one complete revolution of every planet is equal to cube of semi major axis of that planet. So the formula can be derived as  

                             [tex]T^{2}=a^{3}[/tex]

Where T is the time taken for completing one revolution and a is the semi-major axis of the planet.

As here Neptune's semi major axis is given as 30.11. So the period of Neptune can be determined as follows:

                      [tex]T^{2}=(30.11)^{3}[/tex]

                      [tex]T^{2}=27,298[/tex]

Then take square root of this value:

                               [tex]T=\sqrt{27,298}[/tex]

                                      T = 165 years

Thus, the Neptune takes 165 years for one complete revolution of the sun.

a. 1.51 s

In this part of the problem, we are only interested in the horizontal motion of the ball. Along the horizontal direction, the motion of the ball is a uniform motion with constant velocity, which is equal to the horizontal component of the initial velocity:

[tex]v_x = v_0 cos \theta = (19.0 m/s)(cos 40^{\circ})=14.6 m/s[/tex]

So, the ball travels horizontally at a speed of 14.6 m/s; in order to cover the distance of d = 22.0 m that separates it from the wall, the time need is

[tex]t=\frac{d}{v_x}=\frac{22.0 m}{14.6 m/s}=1.51 s[/tex]

b. 7.25 m

We now know that the ball takes 1.51 s to hit the wall, 22.0 away. Now we have to analyze the vertical motion of the ball, which is an accelerated motion with constant acceleration g =9.8 m/s^2 towards the ground (acceleration due to gravity).

The initial vertical velocity is

[tex]v_{y0}=v_0 sin \theta=(19.0 m/s)(sin 40^{\circ})=12.2 m/s[/tex]

The vertical position of the ball at time t is given by the equation

[tex]y(t)=v_{0y} t -\frac{1}{2}gt^2[/tex]

We know that the ball hits the wall at t=1.51 s, so if we substitute this value into the previous formula, we find at what height y the ball hits the wall:

[tex]y(1.51 s)=(12.2 m/s)(1.51 s)-\frac{1}{2}(9.8 m/s^2)(1.51 s)^2=7.25 m[/tex]

There are two qualities that can describe most variables - direction and magnitude. A vector possesses both a direction and magnitude, while a scalar possesses only a magnitude.

Hope this helps!

Answer:

It can be described on by its magnitude

MAGNITUDE

Explanation:

Vector quantities are described by their magnitude and their direction both

so all vector quantities like velocity etc need direction and magnitude both like velocity is given as 60 km/h towards North direction

But for scalar quantities we defined them only by their magnitudes

Like here if we define mass then we do not require any direction for its complete explanation.

so here correct answer will be

MAGNITUDE

Answer:

C

Explanation:

kinetic energy and mass are dieectly proportional

Answer:

Kinetic energy and mass are directly proportional to each other

Explanation:

As we know by the formula of kinetic energy

[tex]KE = \frac{1}{2}mv^2[/tex]

now we know that

kinetic energy depends on the mass of object and it is product of mass and square of the speed.

Here we can say that if mass is doubled then kinetic energy also get double and if mass is decreased then kinetic energy also decreases

This type of relationship is known as direct relationship and here since it shows direct relationship so correct answer will be

Kinetic energy and mass are directly proportional to each other

Answer:

C. The outer ear has to collect the sound waves and lead them to the middle ear.

Explanation:

In the process of hearing, the first thing that happens is that sound waves enter the outer ear through a passage called "auditory canal" that reaches the eardrum.

The movement of the incoming sound waves causes the eardrum to vibrate and transmit these vibrations to three tiny bones of the middle ear.

Answer: i think its c

Answer:

c

Explanation:

Electrical energy = Power x time.

30 minutes = 0.5 hours.

Electical energy = 1200W x 0.5 hours = 600W/hour = 0.6kWh

Answer:

d

Explanation:

because i know

Answer:

Explanation:

D

A catalyst starts out with the reactants and winds up with the products. It does  not take any part of the reaction. It just lowers the activation energy (usually) making it easier to get from the left side of the equation to the right side.

B is the second best answer, and had you not chosen B and gotten wrong, I think I would have agreed with you.

Newton´s second law of motion

Final answer:

The reason a school bus full of kids takes longer to stop than a small car can be attributed to Newton's Second Law of Motion and the fact that kinetic energy increases with the square of the speed, requiring more work to stop a more massive vehicle like a school bus.

Explanation:

The phenomenon where a school bus full of kids takes longer to stop than a small car can be explained by Newton's Second Law of Motion, which states that the acceleration of an object is directly proportional to the net force acting on the object and inversely proportional to its mass. The more mass an object has, like a school bus with children, the more force is needed for it to change its state of motion. When stopping, the required force translates to the braking force, which must overcome the kinetic energy of the vehicle. Since kinetic energy increases with the square of the speed, and because a school bus has a greater mass, it has significantly more kinetic energy than a small car at the same speed. This results in a longer stopping distance for the school bus, as the brakes need to do more work to reduce its kinetic energy to zero.

Answer:

[tex]1.25\cdot 10^5 eV[/tex]

Explanation:

The energy of the incident electron is equal to the energy acquired by the X-rays photon emitted by the tube, which is given by

[tex]E=\frac{hc}{\lambda}[/tex]

where

h is the Planck constant

c is the speed of light

[tex]\lambda[/tex] is the wavelength

In this problem, the wavelength of the photon is

[tex]\lambda=1.0\cdot 10^{-11} m[/tex]

Therefore, the energy is

[tex]E=\frac{(6.63\cdot 10^{-34} Js)(3\cdot 10^8 m/s)}{1.0\cdot 10^{-11} m}=2.0\cdot 10^{-14} J[/tex]

And keeping in mind that

[tex]1 eV = 1.6\cdot 10^{-19} J[/tex]

We find the energy in electron volts:

[tex]E=\frac{2.0\cdot 10^{-14}J}{1.6\cdot 10^{-19} J/eV}=1.25\cdot 10^5 eV[/tex]

Answer:

A. Sifting since the wood shavings are small enough to fall through the sift but nails are not.

From that particular list of choices, Flotation is the best. (B)  Fill the trash can with water and stir it up.  The nails will sink to the bottom, and the wood shavings will float on top, and you can skim them off.

But then what have you got ?  You've got wet nails that'll rust if you don't dry them off in a hurry, and you've got a sticky wet pile of soggy wood shavings.

Can I suggest a better way to separate them ?  Dump everything out on the ground, and pass a humongous magnet over it.  The wood shavings will just lay there, but the nails will jump out and stick to the magnet.  And everything will stay dry.

Final answer:

Clouds form when water vapor condenses into tiny droplets that aggregate around small particles or nuclei and then fall as precipitation.

Explanation:

Clouds form under specific conditions. The necessary conditions for clouds to form include:

These processes are part of the water cycle, where water evaporates from the ocean, condenses in the atmosphere, and eventually falls back to the Earth as precipitation.

It could result in it not being good for your joints, as well as in the long run but shouldn't cause problems when your a child. I hope this helps your question!

Answer:  

An unbalanced force is one that causes a change in the motion of the object to which the force is applied. An object at rest or an object in steady motion continues at rest or in unchanged motion unless it is subjected to an unbalanced force.

Balance forces are two forces acting in opposite directions on an object, and equal in size. Anytime there is a balanced force on an object, the object stays still or continues moving continues to move at the same speed and in the same direction.

Explanation:

A satellite orbiting Earth at constant speed would be considered an unbalanced force because it is an object in steady motion and it will remain in steady motion unless it is subjected to an unbalanced force.

Answer:

An unbalanced force is one that causes a change in the motion of the object to which the force is applied. An object at rest or an object in steady motion continues at rest or in unchanged motion unless it is subjected to an unbalanced force.

Explanation:

Answer:

B.

The form of energy that travels as electromagnetic waves.

Explanation:

Light energy, or electromagnetic field energy, is the form of energy that travels as electromagnetic waves. These waves do not need a medium through with to travel, so they are able to travel through the vacuum of outer space. Some types of light can be sensed by the human eye.

The best definition given is B: light energy is the form of energy that travels as electromagnetic waves, and this form of energy includes both wavelike behavior and particle-like characteristics as photons.

The best definition of light energy among the given options is B. The form of energy that travels as electromagnetic waves.

Light energy is a form of electromagnetic radiation that moves through a vacuum at a constant speed of approximately 3 × 108 meters per second. This radiation exhibits wavelike behavior, which includes a frequency (v) and a wavelength (λ), adhering to the equation c = λv, where c represents the speed of light. Additionally, light can be described as a stream of particles called photons, capturing the dual nature of electromagnetic radiation as both waves and particles, a concept referred to as wave-particle duality.

Light energy is best defined as the form of energy that travels as electromagnetic waves. Light is an example of a transverse wave, where the oscillations occur in the electric and magnetic fields perpendicular to the direction of motion. It exhibits both wave-like and particle-like behavior, known as wave-particle duality, and can be described as a stream of particles called photons, with energy related to the frequency or wavelength of the light.

The ossicles, a trio of tiny bones in the middle ear, receive sound vibrations from the eardrum and transfer them to the cochlea, which then converts them into electrical signals for the brain.

The part of the ear that receives the signal from the eardrum is the ossicles in the middle ear. Once the eardrum, or tympanic membrane, vibrates in response to sound waves, it transfers these vibrations to the ossicles. These three tiny bones - the malleus (hammer), incus (anvil), and stapes (stirrup) - act as a lever system, amplifying the sound vibrations and transmitting them to the cochlea in the inner ear. Inside the cochlea, the mechanical vibrations are converted into electrical signals by hair cells, and these signals are then transmitted to the brain via the auditory nerve.

Explanation:

To provide the leverage needed to produce enough force to overcome what you're trying to cut.

Answer:

this is a diagram illustrating the valance electrons on an oxygen atom

The diagram represents an oxygen atom Option A

An oxygen atom is a chemical element represented by the symbol "O" on the periodic table. It is classified as a non-metal and has an atomic number of 8, indicating the number of protons in its nucleus. The most common isotope of oxygen, found in nature, is oxygen-16, meaning it has 8 protons and 8 neutrons.

Oxygen is essential for life and is a crucial component of many compounds, including water (H2O) and various organic molecules. It plays a vital role in cellular respiration, the process by which living organisms extract energy from nutrients.

The electron configuration of an oxygen atom is 1s² 2s² 2p⁴, indicating the distribution of its eight electrons in different energy levels and orbitals.

Oxygen atoms tend to form covalent bonds with other atoms, sharing electrons to achieve a stable configuration. Molecular oxygen (O2) is a diatomic molecule, consisting of two oxygen atoms bonded together.

The formula for kinetic energy is equal to 1/2mv^2, where "m" is the mass of the object (in kilograms) and "v" is equal to the velocity of the object (in meters per second). To calculate the speed, simply plug in the values and solve.

KE = 0.5mv^2

304 J = 0.5(0.3 kg)v^2         -mass converted from grams to kilograms

v = 45.02 m/s

The baseball is travelling about 45.02 meters per second.

Hope this helps!

The speed of the baseball is 45.02 metres per seconds square.

Given the following data;

Conversion:

1000 grams = 1 kilogram

300 grams = X kilograms

Cross-multiplying, we have;

X × [tex]1000[/tex] = [tex]300[/tex]

X = [tex]\frac{300}{1000} = 0.3[/tex] kilograms.

To find the speed of the baseball;

Kinetic energy can be defined as an energy possessed by an object or body due to its motion.

Mathematically, kinetic energy is given by the formula;

[tex]K.E = \frac{1}{2}MV^2[/tex]

Where;

Substituting the values into the formula, we have;

[tex]304 = \frac{1}{2}[/tex] × [tex]0.3[/tex] × [tex]V^{2}[/tex]

[tex]608 =[/tex]  [tex]0.3[/tex] × [tex]V^{2}[/tex]

Dividing both sides by 0.3, we have;

[tex]V^{2} = \frac{608}{0.3}\\\\V^{2} = 2026.67[/tex]

Taking the square root of both sides, we have;

[tex]V = \sqrt{2026.67}[/tex]

V = 45.02 metres per seconds square.

Therefore, the speed of the baseball is 45.02 metres per seconds square.

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In a longitudinal wave, particle displacement is  parallel to the direction of wave motion.

(In a transverse wave, particle displacement is perpendicular to the direction of wave motion .)

Answer:

it is B

Explanation:

The answer is B. Because the two materials will not switch temperature, heat is only transferred from a hotter material to a colder material to achieve equilibrium in temperature. Thus, option C and D is out. Option A is also wrong because the faster moving particles should be in the hotter material not the colder material, this is because when the material is hot, the kinetic energy of the particles increase, causing it to move faster.

In electromagnetic waves, energy is transferred through vibrations of electric and magnetic fields. In sound waves, energy is transferred through vibration of air particles or particles of a solid through which the sound travels. In water waves, energy is transferred through the vibration of the water particles.

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Answer:

Sound waves transfer energy by causing successive compressions and rarefactions in the particles of the medium without transporting the medium particles themselves.

Explanation:

Sound in solids can also manifest as transverse waves, causing crests and troughs in the propagation medium. Waves can be characterized by two basic parameters: amplitude and frequency. Focusing on a single point vibrating in a medium excited by a sound wave, amplitude is the maximum distance traveled by the vibrating point relative to its rest position. Taking a snapshot of a propagating sound wave at any instance shows consecutive compressions and rarefactions, regions in which the medium material is compressed together and spread widely apart, respectively. The distance between the centers of two successive compressions or rarefactions is the wavelength of the wave. The frequency is the inverse of the wavelength, so the larger the frequency, the smaller the wavelength. Having a higher frequency makes the wave have a larger number of more closely-grouped compressions and rarefactions as it propagates. As the amplitude and frequency of the wave increase, the energy transferred by the propagation of the wave also increases. Extremely short but low-amplitude ultrasonic waves can be used to heat polymer materials and weld them together.

Answer:

D. Down

Explanation:

The uranium-containing rods in the diagram should be moved down in order to slow down the fission reactions in its nuclear reactor.

Nuclear fission is the process of splitting the nucleus of heavier atoms to produce two or more atoms of lighter nucleus with the release of large amounts of energy.

In order to slow down the fission reactions in its nuclear reactor, neutron absorbers are introduced and the uranium-containing rods are removed from the nuclear reactor.

Therefore, the uranium-containing rods in the diagram should be moved down in order to slow down the fission reactions in its nuclear reactor.

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