A ball is thrown horizontally at a height of 2.2 meters at a velocity of 65m/s off a cliff. Assume no air resistance. How long until the ball reaches the ground?​

The speed of sound in air is directly proportional to the temperature of the air. This is because increasing the temperature reduces the air's compressibility, making it easier for sound to travel through.

The true statement is B. The speed of sound in air is directly proportional to the temperature of the air.

The speed of sound in any medium is determined by a mixture of the medium's density and rigidity, which, in the case of gases like air, is translated as compressibility. In other words, the speed of sound is higher in more rigid (or less compressible) mediums. Air is easily compressible, so the speed of sound is relatively low in it.

However, temperature impacts this as well. As the temperature rises, the particles in the air move more quickly, and so the density of the air decreases - the gas becomes less compressible. With increased temperature, sound finds it easier to travel through the medium, and so the speed of sound increases. Thus, the speed of sound in air is directly proportional to the temperature of the air because an increase in one corresponds to an increase in the other. For example, sound travels at 331 m/s in the air at 0 °C, but the speed increases to 346 m/s once the temperature hits room level (around 20 °C).

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A. Are created by vibrations

A common characteristic of sound waves is that they are created by vibrations. Sound is produced when an object or medium vibrates, causing molecules or particles in the surrounding medium to also vibrate. The correct option is option (A).

A common characteristic of sound waves is that they are created by vibrations. These vibrations are transmitted as mechanical waves through the medium, resulting in the propagation of sound.

Sound waves travel in a variety of directions depending on the source and surrounding conditions, so option (B) is not accurate in general.

Option (C) is incorrect because sound waves require a medium to propagate and cannot travel through empty space, such as a vacuum.

Option (D) is also incorrect because the speed of sound is much slower than the speed of light.

A common characteristic of sound waves is that they are created by vibrations. The correct option is option (A).

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Answer:

It might be the sum is the same

Explanation:

Correct me if i am wrong but there is no friction so that means there would not be anything slowing down the ball, therefore the ball wouldn't change or the energy wouldn't change because the ball would never stop.

The sum of the ball’s kinetic energy and potential energy remains the same as the ball rolls from point A to point E ( if there’s no friction between the ball and the ground).

Answer: Option C

Explanation:

Based on the law of mechanical energy's conservation, the sum of both kinetic and potential energies i.e. the total amount of mechanical energy remain conserved even in the absence of dissipative forces (friction or air resistance) in a bound system.

                    E = Kinetic + Potential

The kinetic energy is high when ball goes downward but potential energy decreases and reverse happens when ball goes up. But in these case, the sum energy would be constant one.

Refer to the diagram attached (created with GeoGebra). Consider the 5 N force in two directions: parallel to the 8 N force and normal to the 8 N force.

The sum of forces on each direction will be the resultant force on that direction:

Apply the Pythagorean Theorem to find the magnitude of the resultant force.

[tex]\displaystyle \Sigma F = \sqrt{{(8 + \dfrac{5\sqrt{2}}{2})}^2 + {(\dfrac{5\sqrt{2}}{2})}^2} = 12.1\;\text{N}[/tex] (3 sig. fig.).

The size of the angle between the resultant force and the 8 N force can be found from the tangent value of the angle. Tangent of the angle:

[tex]\displaystyle \dfrac{\Sigma F_\text{Normal}}{\Sigma F_\text{Parallel}} = \dfrac{8 + \dfrac{5\sqrt{2}}{2}}{\dfrac{5\sqrt{2}}{2}} \approx 0.306491[/tex].

Find the size of the angle using inverse tangent:

[tex]\displaystyle \arctan{ \dfrac{\Sigma F_\text{Normal}}{\Sigma F_\text{Parallel}}} = \arctan{0.306491} = 17.0\textdegree[/tex].

In other words, the resultant force is 17.0° relative to the 8 N force.

A. Gamma waves have the highest

Gamma Waves have the highest energy in the given list, followed by X-rays, Ultraviolet, Visible Light, Infrared, Microwaves, and then Radio Waves. Their energy is high enough to damage biological cells

In the electromagnetic spectrum, the energy of a wave is inversely proportional to its wavelength. The shorter the wavelength, the higher the energy they have. In this list, Gamma Waves have the shortest wavelength and therefore the highest energy.

Following Gamma Waves, are X-rays, Ultraviolet, Visible Light, Infrared, Microwaves, and then Radio Waves in terms of energy. Among these options, Gamma Waves definitely have the highest energy. The energy of Gamma Waves can be so high that they can cause damage to biological cells and are thus used in cancer therapy to destroy tumors.

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A battery operated lamp because battery's don't use your own electricity. They come with electricity already.

a battery operated lamp

Final answer:

At a constant voltage, current and resistance are inversely related as per Ohm's Law, with current decreasing as resistance increases, and vice versa.

Explanation:

When the voltage in a circuit is held constant, the current flowing through the circuit is inversely proportional to the resistance. This relationship is encapsulated by Ohm's Law, which states that the current (I) is equal to the voltage (V) divided by the resistance (R), mathematically represented as [tex]I = \frac{V}{R}[/tex].

As such, if the resistance in the circuit increases while the voltage remains unchanged, the current will decrease. Conversely, if the resistance decreases, the current will increase.

The resistance is influenced by factors such as the material of the conductor and its temperature. At a constant temperature, the resistance remains steady regardless of the changes in voltage or current.

Therefore, when considering Ohm's Law in a practical scenario, such as household electrical circuits, resistance plays a critical role in determining the current that flows through an appliance.

Given that,

mass of block A = 14kg

mass of block B = 12kg

angle alpha equals = 19°

Tension in wire connecting weight of object A and B is due to weight of block B

             = mgsin19

due to slope we will take horizontal components of weight, mg

             = 12(9.81)sin(19)

             = 38.3

Answer:

1 average 2 subtract.

Explanation:

a). add

b). subtract.

True because the picture below proves this....

* from which red color is least deviated and violet most.

* Hopefully this helps:) Mark me the brainliest:) !!

∞ 234483279c20∞

Yes, the statement is true. When white light passes through a prism, red light is the least deviated because it has the longest wavelength among the visible light spectrum. This dispersion phenomena breaks white light into its constituent colors.

The statement 'When white light passes through a prism, red light is least changed in direction' is True. This is because when white light, which is made up of different colors or wavelengths, is refracted through a prism, it experiences dispersion. As a result, different wavelengths of light are bent by different amounts. This phenomenon occurs because different frequencies of light have different refractive indices for a given material. Therefore, each color follows a slightly different path through the prism. Red light has the longest wavelength among the visible light spectrum and is refracted or bent the least compared to other colors such as violet, which has the shortest wavelength and is refracted the most. This explains why when we observe the dispersion of white light through a prism, such as in Newton's rainbow experiment, we see red light emerge at the least deviated angle, and violet light at the most deviated angle.

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She does 200J .

We know she uses 20N of force and 10m is the distance. We multiply both numbers and we are given our answer of 200J. Hope this was helpful. :)

B. 2HCl + Mg(OH)2 → 2H2O + MgCl2

The change in the kinetic energy of the object as the speed changes is proportional to the square of the factor by which the speed changes. For example if the speed of the object becomes double, its kinetic energy changes to four times the initial kinetic energy.

The answer is A. Solids have both definite shape and denfinite volume.

The correct statement that describes the properties of solids is A. Solids have both a fixed shape and a fixed volume, resulting from the particles being in fixed positions and bound by strong intermolecular forces.

Among the statements given, the one that best describes the properties of solids is: A. Solids have both definite shape and definite volume. In the solid state, the particles that make up the material are in fixed positions relative to each other because the thermal energy is not sufficient to overcome the strong intermolecular forces that bind them. This result is that solids have a rigid and definite shape, and they also have a definite volume, which means they do not change volume or shape unless a force is applied that alters their structure.

Liquids, on the other hand, have a definite volume but no definite shape, assuming the shape of their containers. Gases fill their containers completely, expanding to fill the volume available and thus having neither a definite volume nor a definite shape.

The technology that uses electromagnetic radiation with the longest wavelength is the Wireless communications transmitter, as it uses radio waves, which have the longest wavelengths in the electromagnetic spectrum.

The question refers to which technology uses electromagnetic radiation with the longest wavelength. From the given options, wireless communications transmitters typically use radio waves, compact fluorescent light bulbs emit light mostly in the visible spectrum, microwave industrial drying equipment uses microwaves, and infrared sensors on a DVD player use infrared radiation.

Based on the electromagnetic spectrum, radio waves have the longest wavelength, followed by microwaves, then infrared, and finally visible light which is emitted by the compact fluorescent bulbs. Therefore, the technology that uses the electromagnetic radiation with the longest wavelength amongst the choices provided is A. Wireless communications transmitter.

Answer:

The gravitational attraction of the Sun is what holds the planets in their elliptical orbits. So to explain this the mass effects the motion of the planets because the strength of gravitational force depends of the mass.

Explanation:

The mass of a planet affects the motion of the planet around the sun because mass is directly proportional to the gravitational force.

The force of attraction felt by a person at the center of a planet or Earth is called as the gravity.

Force of gravity between Sun and planet while moving in orbit is given by

F = GMm/R²

where M is the mass of Sun, m is the mass of any planet, G = gravitational constant = 6.67 x 10⁻¹¹ N.m²/kg² and R is the distance between two masses.

The weight of a person or object is determined by gravity. The gravitational attraction of the Sun holds the planets to move in their elliptical orbits.

Thus, the mass effects the motion of the planets because the strength of gravitational force depends of the mass of planet

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Answer:

1.88 N

Explanation:

Given in the question,

force applied by Jason  = 4N

angle which it make with the ground = 62°

The angle made with the x-axis is cosine of the angle 62°

Thus, the horizontal component of the force is equal to

F = 4.00(cos62⁰) = 1.88 N

              /

            /

4N     /

       /

     / 62°

  Ф ------------------------

by using trigonometry identity

cosФ = adjacent / hypotenuse

horizontal force = hypotenuse (cos(Ф))

horizontal force = 4cos(62)

Answer:

The last part on the right side of the diagram

Explanation:

Im on plato and just got it right :)

The last part on the right end of the given wave has the highest frequency.

The frequency can be defined as the number of oscillations of a wave in 1 second. The wavelength can be described as the distance between the two crests or troughs on a wave that is separated by a distance.

For periodic waves, media in which the wave speed is independent of frequency, therefore the frequency has an inverse relationship to the wavelength.

[tex]{\displaystyle f={\frac {v}{\lambda }}[/tex]

In electromagnetic waves in vacuum, then v = c, where c is the speed of light:

[tex]{\displaystyle f={\frac {c}{\lambda }}[/tex]

When monochromatic waves propagate from one medium to another, their frequency will remain the same.

Frequency can be defined as the number of occurrences of a repeating event per unit of time. Frequency can be measured in hertz (Hz) which is generally equal to one event per second.

Therefore, the part at the very right of the wave has the highest frequency.

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Answer:

work being done on an object.

Answer. A. A man pushes a couch across the room

diagram identifies an axle:

Answer: B. Z

simple machine described as a shaft at the center of a wheel:

Answer: D. Wheel and axle

Type of lever:

A. a catapult

Answer:

work being done on an object.

Answer. A. A man pushes a couch across the room

diagram identifies an axle:

Answer: B. Z

simple machine described as a shaft at the center of a wheel:

Answer: D. Wheel and axle

Type of lever:

A. a catapult

Explanation:

Answer: b. mirages

Explanation:

A mirage is an optical illusion that occurs naturally due to refraction in the atmosphere. This phenomenon occurs especially in environments where the air exhibits large variations in its temperature, causing each of the layers with different temperatures to have a different index of refraction and therefore, the light rays will be diverted to the colder side.

Then, when this happens, displaced images of distant objects, or in the sky, are produced. In fact, sometimes it seems that distant objects are reflected on a liquid surface that is not real.

= 4 feet

The height of the wave is defined as the elevation of the crest minus the elevation of the trough. or

The wave height is defined as the twice of the amplitude

It is given that the amplitude of the wave is 4 feet. The height of the wave is given as;

H = 2a

Where a is the amplitude of the wave.

Therefore, H = 4 feet.

C. the atlantic tectonic plate does NOT exist

The C. Atlantic Plate is not a tectonic plate.

All continents and oceans on Earth rest on tectonic plates which form a part of the Earth's crust. These plates are constantly in motion because they are floating on the mantle.

There are several plates on Earth but none of them are called the Atlantic plate.

The Atlantic ocean rests on:

In conclusion we can therefore say that there is no Atlantic plate.

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

kinetic energy : ke

m : mass ( 25kg )

v : velocity ( 10 m/s )

[tex] \frac{1}{2} \times 25 \times {10}^{2} [/tex]

= 1250 (J )

My answer is 1250J. By doing 1/2 × 25 × 10²

The product of (wavelength) x (frequency) is always the same number ... the wave's speed.  

So if the wavelength is somehow reduced to  1/4  its original length, the frequency is immediately multiplied by 4 .  That's the only way their product can remain the same.

The frequency increases by a factor of four when the wavelength is lowered by a factor of four.

Frequency is defined as the number of repetitions of a wave occurring waves in 1 second.

Frequency is given by the formula as,

[tex]\rm v = \lambda \times f[/tex]

If a wave travels at a constant speed the e frequency is inversely proportional to the wavelength.

if the wavelength is reduced by a factor of 4 then the frequency increases by a factor of 4.

Hence, the frequency increases by a factor of 4.

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Answer:

2 m/s

Explanation:

The impulse exerted by the obstacle on the block is equal to the change in momentum of the block:

[tex]I=\Delta p = -6 Ns[/tex]

where we put a negative sign because the direction of the impulse is south, which is opposite to the initial direction of travelling of the block (north).

The change in momentum is also equal to

[tex]\Delta p = m (v-u)[/tex]

where

m = 3 kg is the mass of the block

v is the final velocity

u = +4 m/s is the initial velocity

Solving the equation for v, we find the final velocity of the block:

[tex]v=u+\frac{\Delta p}{m}=+4 m/s+\frac{-6 Ns}{3 kg}=+2 m/s[/tex]

and the positive sign means the direction is still north.

92 percent because you multiply it by 2

I'm pretty sure that would be a A.

Ohm's law states that the electrical current (I) flowing in an circuit is proportional to the voltage (V) and inversely proportional to the resistance (R). Therefore, if the voltage is increased, the current will increase provided the resistance of the circuit does not change.

Changes in voltage and resistance directly impact electrical current due to Ohm's Law. Increasing voltage increases current if resistance is kept constant. Conversely, increasing resistance decreases current if voltage is kept constant.

The effect of changing voltage and resistance on electric current can be explained using Ohm's Law, which states that the current through a conductor between two points is directly proportional to the voltage across the two points, and inversely proportional to the resistance between them. This can be expressed by the formula I = V/R, where I is the current, V is the voltage, and R is the resistance.

When voltage increases, the current will also increase if the resistance is kept constant. Similarly, increasing resistance will decrease the current if the voltage is kept constant. For example, when the voltage is doubled to a 25-W bulb, its power nearly quadruples to about 100 W, burning it out. If the bulb's resistance remained constant, its power would be exactly 100 W, but at the higher temperature its resistance is higher, too.

Therefore, voltage and resistance are intricately linked to the electric current in a circuit. It's always critical in electrical circuits to have a proper balance of voltage, resistance, and current to prevent any malfunctions or damage to electrical components.

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Answer:

Unbalanced, 5N to the right.

Explanation:

Answer: the answer is B.

Explanation:

Answer:

Option B)

Explanation:

As we know that Earth's magnetic poles are inclined at some angle with the rotational axis of the Earth.

So here the magnetic poles must be inclined at some angle with the rotational axis of Earth

Now we know that magnetic field of earth originates from the south pole of earth and terminate near the north pole of earth

So magnetic poles of earth are opposite to the geographic pole of earth

So magnetic field will originate near the south pole and go near the north pole of earth

so here correct answer must be Option B)

  = 64 N/m

According to Hooke's Law for a helical spring or an elastic material, extensional force is directly proportional to the distance the material has extended.

F = ke; where F is the extension force, k is the spring constant, and e is the distance extended.

Thus;

k = F/e

  = 44N/0.69 m

  = 63.768 N/m

  = 64 N/m