A 20 kg tennis ball launcher shoots a 0. 057 kg tennis ball across a frictionless court. If the tennis ball’s velocity after it is launched is 36 m/s to the north, what is the velocity of the tennis ball launcher?

ANSWER

False

EXPLANATION

We want to know if the image produced by a convex lens is always real.

A convex lens can form real images but it can also form virtual images. This will only occur when the object is placed in between the focus and optical center of the lens.

In this case, the image is erect and enlarged and magnification is always greater than 1.

The answer is false.

The flapping of a flag in the wind is best explained by Newton's principle of motion, specifically his laws of inertia and acceleration.

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Based on the given information, I agree with Ari's statement. Ari believes that the expanding gases in the cannon chamber give the cannonball speed, not force. This is because when the cannon is fired, the expanding gases push against the cannonball, propelling it forward. Once the cannonball leaves the barrel of the cannon, there is no longer a force acting on it.

Force is defined as a push or pull on an object, and in this case, it is provided by the expanding gases. Therefore, Leo's statement that the force remains with the cannonball, keeping it going, is incorrect. The force is only present while the cannonball is in the barrel and being propelled by the expanding gases. Once it leaves the cannon, the force is no more.

This is because when the cannon is fired, the expanding gases push against the cannonball, propelling it forward. Once the cannonball leaves the barrel of the cannon, there is no longer a force acting on it.

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Liquid containers are necessary to store liquids or other fluids, and are manufactured using various materials. These materials have unique properties and physical characteristics to meet the diverse requirements of different fluids and their storage conditions. Two of the materials used to make liquid containers are covalently bonded and metal.

1) Covalently bonded materials:Covalent bonds are strong bonds formed between atoms by sharing electrons. Covalently bonded materials are non-metallic materials that use a covalent bond between atoms to form the material. Examples of covalently bonded materials that can be used to manufacture liquid containers include:

- Polyethylene Terephthalate (PET): PET is a plastic material used to make water bottles and soft drink bottles. PET is lightweight and unbreakable, making it ideal for shipping and storing liquids.

- Polypropylene (PP): PP is a popular plastic material that is lightweight, durable, and resistant to chemical reactions. PP is used to make containers that store harsh chemicals and strong acids, as well as food containers, such as yogurt cups and margarine tubs.

In conclusion, there are many materials available that can be used to manufacture liquid containers, including covalently bonded materials and metals. The choice of material used depends on the type of liquid being stored and the storage conditions.

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If we push other person with a force, he or she can exerts an equal and opposite force. If the force is unbalanced, then the displacement will occur in the direction of greater force.

Force is an external agent acting on a body to change its motion or to deform it. The net force acting on a body depends on the magnitude and direction of all the forces acting on it.

According to Newton's third law of motion for every action there is an equal and opposite reaction. Therefore, the force exerted on anything is accompanied by an equal and opposite force.

If we push another person with a force, then the they can exerts an equal force in opposite direction. If the force in any direction dominates, the displacement occurs in that direction.

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A wedge is like a ramp that can work while in motion.

As a tool for raising or lowering a load, an inclined plane, also referred to as a ramp, is a flat supporting surface that is tilted at an angle from the vertical direction with one end higher than the other. One of the six traditional simple machines that Renaissance scientists defined is the inclined plane.

Heavy loads are transported over vertical obstacles using inclined planes. Examples include a ramp used to load cargo into a truck, a pedestrian ascending a ramp, or an automobile or train ascending a grade.

Less force is needed to lift an object up an inclined plane than to lift it straight up, but the distance travelled is greater. Hence, a wedge is like a ramp that can work while in motion.

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Answer:

magnitude and direction

The only vehicle that is accelerating is: C: a race car that is rounding a sharp turn at a constant speed.

Acceleration refers to a change in velocity, which can mean a change in speed or direction. In the case of option C, the race car is constantly changing its direction, so it is experiencing acceleration even though its speed remains constant.

Option A is cruising at a steady speed, so it is not accelerating.

Option B is parked and not moving, so it is not accelerating.

What is velocity?

Velocity is a physical quantity that describes the rate and direction of the motion of an object. It is a vector quantity, which means it has both magnitude and direction.

The magnitude of velocity is the speed of an object in a given direction. For example, if a car is traveling at a speed of 50 miles per hour (mph) in the north direction, its velocity is 50 mph north.

The direction of velocity is the direction in which the object is moving. It is usually specified as an angle relative to a reference axis or direction. In the example above, the direction of the car's velocity is north.

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Martian water may contain salts, which lowers the freezing temperatures of the water

How is Mars atmosphere?

The atmosphere of Mars is much thinner than Earth’s. The Red Planet's atmosphere contains more than 95% carbon dioxide and much less than 1% oxygen. People would not be able to breathe the air on Mars.

It is possible that liquid water could also exist on the surface of Mars through the formation of brines suggested by the abundance of hydrated salts. Brines are significant on Mars because they can stabilize liquid water at lower temperatures than pure water on its own.

Thus, in the extreme and uneventful conditions of saturation by mixtures of salts, liquid water can be stable on Mars between 180 K and at least up to 298 K.

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The near point of the person, whose eyes have a fully-accommodated power of 53.9 D, is approximately 0.237 meters or 23.7 cm.

The near point of a person refers to the closest distance at which the person can focus on an object clearly. It is determined by the power of accommodation of the person's eyes. Accommodation is the ability of the eye's lens to change its shape in order to focus on objects at different distances.

In this case, the fully-accommodated power of the person's eyes is given as 53.9 D. The unit "D" stands for diopters, which is a unit of measurement for the refractive power of a lens. A positive value of power indicates a converging lens, which is responsible for focusing light rays onto the retina to form clear images.

To find the near point, we need to calculate the distance at which the person's eyes can focus objects with the given power of accommodation. The formula relating power, object distance, and image distance is:

1/f = 1/do + 1/di,

where f is the focal length of the lens, do is the object distance, and di is the image distance. In this case, the person's eyes act as a lens system with a fully-accommodated power of 53.9 D.

The formula for the power of a lens is given by:

P = 1/f,

where P is the power of the lens in diopters and f is the focal length in meters.

Given that the lens-to-retina distance is 2.00 cm (or 0.02 m), we can substitute the values into the formula to find the focal length:

53.9 D = 1/f,

f = 1/53.9 D.

Converting D to meters:

f = 1/(53.9 m⁻¹).

Therefore, the focal length of the person's eyes, when fully accommodated, is approximately 0.01855 meters.

Now, we can calculate the near point using the lens formula. The near point is the object distance at which the person's eyes can focus objects with the given power of accommodation. In this case, since the object is at the near point, the image distance di can be assumed to be the lens-to-retina distance (0.02 m).

1/f = 1/do + 1/di,

1/0.01855 = 1/do + 1/0.02.

Rearranging the equation:

1/do = 1/0.01855 - 1/0.02.

Calculating:

1/do ≈ 54.21 m⁻¹ - 50 m⁻¹,

1/do ≈ 4.21 m⁻¹.

Inverting both sides of the equation:

do ≈ 1/4.21 m,

do ≈ 0.237 meters.

Therefore, the near point of the person, whose eyes have a fully-accommodated power of 53.9 D, is approximately 0.237 meters or 23.7 cm. This means that the person can focus on objects as close as 23.7 cm from their eyes with clear vision when fully accommodating.

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Answer:

b

Explanation:

your welcome :)

When a linearly polarized uniform plane wave traveling in free space is incident normally upon a flat dielectric surface, the wave will undergo reflection and transmission.

When the incident wave encounters the dielectric surface, part of the wave will be reflected back into free space and part of the wave will be transmitted into the dielectric material. The reflection and transmission of the wave are determined by the properties of the dielectric material.

The reflection of the wave occurs because the dielectric surface acts as a boundary between two different media with different refractive indices. The incident wave interacts with the surface and some of its energy is reflected back. The reflected wave will have the same frequency and polarization as the incident wave, but its amplitude and phase may be altered.

The transmission of the wave refers to the portion of the wave that enters the dielectric material. The transmitted wave will travel through the dielectric with a different velocity compared to the incident wave in free space. The change in velocity is due to the difference in refractive indices between the two media. The transmitted wave will also experience a change in direction, known as refraction.

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According to the planetary model, the speed of an electron revolving around the nucleus is given as follows;

v = e/√4\(\pi\)∈₀mr.

The orbital speed of an electron, orbiting around a nucleus in a circular orbit of radius 50 consistent with the Bohr model, regularly called a planetary version, the electrons encircle the nucleus of the atom in precise allowable paths referred to as orbits. whilst the electron is in one of these orbits, its energy is fixed.

The ground nation of the hydrogen atom, wherein its electricity is lowest, is whilst the electron is inside the orbit that is closest to the nucleus. The orbits which can be similar to the nucleus are all of the successively extra power. The electron isn't allowed to occupy any of the areas in between the orbits. A regular analogy to the Bohr version is the rungs of a ladder pa is 2. 2×106ms−1.

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Answer:

10 kg

Explanation:

The mass of the object is always constant and does not depend on the gravitational force of the Earth or the Moon.

Answer:

Li has less mass and therefore less inertia, so he can change his motion more easily than Raj.

Explanation:

Answer:

Li has less mass and therefore less inertia, so he can change his motion more easily than Raj.

Explanation:

If electrical hand tools are equipped with a three prong power cord with one wire going to ground, then they are designed to ensure safety while using them. The ground wire provides a safe path for any stray electrical currents that may occur during usage.

This can happen due to various reasons such as a short circuit or an equipment malfunction. If such a situation arises, the current will flow through the ground wire and directly into the ground, instead of causing harm to the user. Additionally, the prong power cord ensures that the tool is properly grounded and reduces the risk of electric shock. The three prongs include a hot wire, a neutral wire, and a grounding wire, which together form a complete circuit. The hot wire carries electricity from the source, the neutral wire returns the current to the source, and the grounding wire provides a safe route for any excess current to flow through.

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The radius of a spherical wave is the distance between the center of the wave source and the wavefront.

A spherical wave is a type of wave that radiates outwards from a single point source, such as a light bulb or a sound source, and expands in all directions in the form of concentric spheres.The radius of the spherical wavefront is defined as the distance between the wave source and any point on the wavefront. It is the same in all directions, since the wave expands in a symmetrical manner.

The radius of a spherical wave can be calculated using the following formula: r = √(D^2 + d^2) where r is the radius of the wavefront, D is the distance between the wave source and a reference point, and d is the distance between the reference point and a point on the wavefront.The radius of a spherical wave is an important concept in the study of wave propagation and diffraction, and is used in many areas of physics, such as optics, acoustics, and electromagnetism.

This formula is based on the Pythagorean theorem, which states that in a right triangle, the square of the hypotenuse (in this case, the radius of the wavefront) is equal to the sum of the squares of the other two sides (the distances D and d).

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Answer:

528 meters

Explanation:

In a block and tackle, the mechanical advantage can be calculated using the height we lift an object and how much rope we pulled to do it. The height we raise the object, divided by the amount of rope we pulled is equal to the mechanical advantage.

We need to lift the piano 11 m, and we know the mechanical advantage, so let's do an equation:

mechanical advantage = how much we pull / height the object goes

48 = x/11 Multiply both sides by 11

48•11 = x

x = 528 m

Answer: the answer is b “The warmer a region of the atmosphere is, the more infared radiation it emits”

Explanation:

Answer:

a

Explanation:

i got it right

Answer:

B

Explanation:

I took the test uwu

Answer:

B. The same number of dots would appear in the diagram for carbon.

Explanation:

took the test and got 100%  

The empty shopping cart is moving at 7.67 m/s.

According to the law of momentum conservation, momentum is only modified by the action of forces as they are outlined by Newton's equations of motion; momentum is never created nor destroyed inside a problem domain.

Total initial momentum = total final momentum

100 kg ×5.0 m/s + 30 kg ×0 m/s = 100 kg ×2.7 m/s + 30 kg ×v

v = (5.0 - 2.7)(100/30) m/s

= 7.67 m/s.

Hence,  the empty shopping cart is moving at  speed of 7.67 m/s.

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The recoil speed of the cannon is (-4) m/s.

We have,

m₁ = 500 kg

m₂ = 4.0 kg

v₁ = ?

v₂ = 500 m/s

The velocity of the cannon and projectile just before the shot is 0.

v₁ = v₂ = 0

The speed of the cannon strike can be calculated by the equation of the law of conservation of momentum, namely

∑P = ∑P’

(m₁) (v₁) + (m₂) (v₂) = (m₁v₁)’ + (m₂v₂)’

(500) (0) + (4.0) (0) = (500) (v₁’) + (4) (500)

0 = 500 v₁’ + 2000

500 v₁’ = (-2000)

v₁’ = (-2000)/500

= (-4) m/s

So, the recoil speed of the cannon is (-4) m/s.

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Answer:

Approximately \(2.69\; {\rm A}\).

Explanation:

Ensure that all values are measured in standard units. Charge should be measured in coulombs, while time should be measured in seconds:

\(\begin{aligned}t &= 3.0\; {\rm hr} \times \frac{3600\; {\rm s}}{1\; {\rm hr}} = 10800\; {\rm s}\end{aligned}\).

Electric current \(I\) is the rate of flow of electric charge.

In order to find the electric current, divide electric charge \(q\) by the time \(t\) required to transfer these charge. If charge \(q\!\) is measured in coulombs and time \(t\!\) is measured in seconds, the unit of current \(I\)would be amperes:

\(\begin{aligned}I & = \frac{q}{t} \\ &= \frac{29000\; {\rm C}}{10800\; {\rm s}} \approx 2.69\; {\rm A}\end{aligned}\).

The temperature of the countertop changes by 0.032 °C. You are preparing breakfast and slide a plate on the countertop.

The quantity of heat transferred to the countertop is given by

Q = CΔT where Q = quantity of heat transferred to the countertop = 5000 J = 5 kJ, C = heat capacity of the countertop = 158.5 kJ/°C and ΔT = temperature change of the countertop.

Since we require the temperature change of the countertop, we make ΔT subject of the formula.

So, ΔT = Q/C

So, substituting the values of the variables into the equation, we have

ΔT = Q/C

ΔT = 5 kJ/158.5 kJ/°C

ΔT = 0.032 °C. So, the temperature of the countertop changes by 0.032 °C.

You are preparing breakfast and slide a plate on the countertop. If the countertop. If the countertop is 1.05 m above the floor and it leaves the top at 0.74m/s.

Therefore, The temperature of the countertop changes by 0.032 °C. You are preparing breakfast and slide a plate on the countertop.

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The voltage can be obtained by the use of Ohm's law as 20 V.

The Ohm's law states that; the current (I) via a conductor between two places is directly proportional to the voltage (V) between the two sites and inversely proportional to the resistance (R) between them if the temperature and other physical factors remain constant.

By the use of the Ohm's law, we know that;

V = IR

I = 2A

R = 10 ohms

V = 2 * 10

V = 20 V

Thus the voltage that is required by the question is 20 V

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1) The control group are the people that are in group B

2) The independent  variable is the administration of the breath mint

3) The dependent variable is the breath of the participants

4) The conclusion of Mr Krab should be that the breath mint is effective in treating bad breath.

5)  10 people in group B reported fresher breath because they thought that they got the breath mint.

The term experiment is used to describe the way tat we could be able to spot the relationship between the dependent and the independent variable. Let us note that the independent variable is the variable that we have to manipulate in the course of an experiment while the dependent variable is the variable that would change as we change the independent variable.

We can see that there was a sort of improvement of the breath of the customers which according to the hypothesis of the experiment would be attributable to the new formula of the  breath mint.

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Answer:

- maintain its state of motion

- Keep its velocity constant (either at zero or non-zero value)

The magnitude of the electric field will be the greatest at the point where it is closest,to its charges.

Yes ,there is a point where the field will be zero.

what is an electric field?

The region where an electrostatic force is experienced by a charged entity is known as the electric field at a point.

As per the principle of field lines and vectors,where the field lines are in a close manner together,the field will be strongest.However ,where the field lines are in a manner apart,the field will be the weakest.

As per the concept,the electric field will be the greatest at the point where it is closest to its charges.For like charges, the electric field will be zero closer to the smaller charge and will be along the line joining the two charges. For opposite charges of equal magnitude, there will not be any zero electric fields.

Thus,we can conclude that there will be a point where the electric field is zero

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Momentum = m • v

Original momentum = m • 10 m/s north

Final momentum = m • 15 m/s north

Change = m • (15 - 10) m/s north

Change = m • +5 m/s north

Change = +60 kg-m/s north

An absorption spectrum is typically observed when light passes through a medium and specific wavelengths of light are absorbed by the atoms or molecules within that medium. Therefore, objects that can absorb specific wavelengths of light would emit an absorption spectrum.

The following objects are examples:

1. Gas: When a gas is heated or energized, it can absorb specific wavelengths of light, resulting in an absorption spectrum. For example, elements like hydrogen, helium, or sodium can produce absorption spectra when light passes through their gaseous state.

2. Liquids: Certain colored liquids can also exhibit absorption spectra. For instance, colored dyes or pigments dissolved in a liquid can selectively absorb certain wavelengths of light, leading to an absorption spectrum.

3. Solids: Some solid materials, particularly those with colored compounds or crystals, can generate absorption spectra. For example, certain minerals or crystals may exhibit absorption bands in the visible or ultraviolet range.

It's important to note that an absorption spectrum is the result of light passing through a medium and being absorbed by specific atoms, molecules, or compounds within that medium. The absorbed wavelengths are missing or reduced in the transmitted light, producing dark absorption lines or bands in the spectrum.

On the other hand, objects that emit light rather than absorb it, such as incandescent light bulbs or glowing hot objects, typically produce an emission spectrum rather than an absorption spectrum. Emission spectra show bright lines or bands corresponding to the wavelengths of light emitted by the object.

In summary, objects that can absorb specific wavelengths of light, such as gases, certain liquids, and some solids with colored compounds or crystals, would emit an absorption spectrum when light passes through them.

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