Which are examples of projectile motion? Check all that apply. a kicker punting a football a car traveling along a highway a free throw in basketball a ball rolling downhill a person throwing darts

As per this question the mass of canoe is given as 21 kg.

The canoe is floating downriver with a speed of 4 m/s.

We are asked to  calculate the kinetic energy of the canoe.

The kinetic energy is the energy due to the motion of the body.

If a body has mass m and it moves with a velocity v ,then its kinetic energy is defined as

                             [tex]kinetic\ energy [K.E]=\frac{1}{2} mv^{2}[/tex]

we are given v= 4 m/s and m= 21 kg

Hence kinetic energy of canoe [tex]K.E= \frac{1}{2} *21 kg [4 m/s]^{2}[/tex]

                                                                 =168 Joule.

Hence the kinetic energy of the  particle is 168 Joule.

Here Joule is the unit of energy

Answer:

Science is supported by facts and processes.

Science involves observation and experimentation.

Science continually changes and is constantly updated.

Options A, C, and D are statements best describe science. Another approach to defining science is that it is the information gained through experience.

Science is knowledge about the physical world and the things that occur within it. It is an objective observation that explains nature's fundamental rules.

The statements best describe science will be;

A)Science is supported by facts and processes.

C) Science involves observation and experimentation.

D) Science continually changes and is constantly updated.

Hence options A, C, and D are statements best describe science.

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Answer:

C. Oceanic plate is thinner and denser than continental plate.

Explanation:

Oceanic plate is also called SIMA because it is made up of silicon and magnesium whereas continental plate is called SIAL because it is made up of silicon and aluminium. Oceanic plate and continental plate both are less dense that mantle but oceanic plate is denser than continental plate. Oceanic plate is made up of basaltic rocks and continental plate is made up of granitic rocks.

Final answer:

A football player has much more inertia than a full water bottle because inertia is directly related to an object's mass, and the player's mass is significantly greater than that of the water bottle. This greater mass results in the player's motion being minimally affected when catching the football, illustrating the player's higher level of inertia.

Explanation:

The question of which has more inertia, a full water bottle sitting on a desk or a football player running with the ball, centers around the concept of mass as the quantifiable measure of an object's inertia. Inertia, by definition, is the resistance of any physical object to any change in its state of motion, including changes to its speed and direction. An object with more mass has more inertia since it requires more force to change its motion.

Through this lens, the football player has much greater mass compared to a water bottle, hence significantly more inertia. Despite the football having a higher velocity when thrown, the player's mass makes his momentum and inertia far greater. This concept is illustrated when considering the effect on motion during the act of catching: the player's motion is only slightly affected because his greater mass (and thus inertia) absorbs the change with minimal alteration in speed or direction.

This observation aligns with the fundamental principles of momentum which state that momentum (mass times velocity) of an object is directly related to both its mass and velocity. However, in the context of inertia, it is the mass component that is most influential in determining the effect of external forces on an object's motion.

Given the scenario and assuming ideal gas behavior, to ensure both gases run out at the same time, you should fill the acetylene tank to a pressure of approximately 224 atm.

For gases behaving ideally, the pressure, volume, and temperature are related by the Ideal Gas Law (PV = nRT). However, in this problem, we assume temperature and gas constant are the same for both gases. Hence, the amount of gas (in moles) is directly proportional to the product of pressure and volume (PV).

Now you want to calculate the pressure in the acetylene tank that ensures both gases run out at the same time. Since both gas tanks will be opened for the same timeframe, the amounts of each gas in moles used will be the same. Hence, the products of pressure and volume will also be equal for both tanks (PV of oxygen tank = PV of acetylene tank).

In other words, (Pressure of oxygen) x (Volume of oxygen) = (Pressure of acetylene) x (Volume of acetylene). By inserting given values for oxygen (Pressure = 155 atm, Volume = 6.50 L) and the volume of acetylene (4.50 L), you can solve for the pressure in the acetylene tank.

From this equation, Pressure of acetylene = (Pressure of oxygen) x (Volume of oxygen) / (Volume of acetylene) = 155 atm x 6.50 L / 4.50 L = 223.88 atm.

Therefore, to ensure you run out of both gases at the same time, you should fill the acetylene tank to a pressure of approximately 224 atm.

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Answer:

0.021 rad/s

Explanation:

t = 5 minutes = 5 x 60 = 300 seconds

Time taken to complete one complete round is called time period.

Let the angular velocity is ω.

The relation between angular velocity and the time period is given by

ω = 2 π / T

ω = ( 2 x 3.14 ) / 300 = 0.021 rad/s

Answer:

D. It changed from a liquid to a gas.

Explanation:

The water in the glass experiences a phenomenon called Evaporation, resulting from the heat of the atmosphere (as it is a hot summer day). The surface layer of the water in the glass will experience a change in state from liquid to gas and the layer beneath it will follow until a noticeable decrease in the water height in glass is present. This state change makes some of the water 'disappear'

Answer : Electromagnetic induction

Explanation :

In Nineteenth century English scientist Michael Faraday found that if he moved a magnet through a loop of wire, an electric current flowed in that wire.

He gives the relation ship between the magnetic field and the electric current to produce electromagnetic force (EMF). The EMF is given as :

[tex]\epsilon=-N\dfrac{d\phi}{dt}[/tex]

Where,

N is the number of turns

[tex]\dfrac{d\phi}{dt}[/tex] is the rate of change of magnetic flux

[tex]\phi=B.A[/tex]

B is the magnetic field

A is the area of cross section

So, the correct option is (B) "electromagnetic induction"

Nineteenth-century English scientist Michael Faraday found that if he moved a magnet through a loop of wire, an electric current flowed in that wire. Faraday discovers electromagnetic induction. The correct option is option (B).

Michael Faraday discovered the process of electromagnetic induction. He found that when a magnet moves through a loop of wire, an electric current is induced in the wire.

This phenomenon is the basis of electromagnetic induction, which describes the generation of an electric current or electromotive force (emf) in a conductor when it is exposed to a changing magnetic field.

Faraday's discovery of electromagnetic induction was a crucial development in the field of electromagnetism and laid the foundation for the development of electric generators, and transformers.

Therefore, Faraday discovers electromagnetic induction. The correct option is option (B).

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If this atom has a balanced charged, 6 protons will be expected to be present in the atom.

A balanced charge in an atom refers to an even or same amount of the positive and negative subatomic particles in the atom.

This further means that the number of protons (+) and electrons (-) in the atom will be equal for there to be a balanced charge.

Based on the image provided in this question, there are 6 electrons (-) in the atom, hence, 6 protons must be present to have a balanced charge in the atom.

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Answer:

3

Explanation:

Answer:

Go to the excited aluminum-28 isotope

Explanation:

In the processes of nuclear reactions, fundamental changes occur at the level of the atomic nucleus.

Analyze the characteristics of the neutron that has approximately the mass of the proton and has no electric charge, so when being absorbed by the aluminum core the atomic number should not be changed, but the atomic mass should increase by one unit.

The new atom formed is in an excited state and enters the base state with the emission of a high-energy radiation, gamma ray that does not transform the atom

Tthe reaction is:

     ⁷A₂₇ + ⁰n₁ → ⁷Al₂₈ˣ

The symbol "ˣ" means excited

      ⁷Al₂₈ˣ → ⁷Al₂₈ + γ

Answer: d is the answer please give me vote and thanks

Explanation:

Answer:

C. If the temperature of water is increased, then it will change into steam is stating a hypothesis.

Explanation:

Answer:

6.9x10^7

Explanation:

The ozone hole is not linked to coal-burning power plant emissions; while acid rain, global warming, and smog are.

The type of pollution that is NOT linked to coal-burning power plant emissions is the ozone hole (option C). Acid rain is linked to coal-burning because of the release of sulfur dioxide (SO2) and nitrogen oxides (NOx) into the atmosphere, which can combine with water vapor to form acid rain. Global warming is associated with coal-burning due to the emission of carbon dioxide (CO2), a major greenhouse gas. Smog is a type of air pollution that can be exacerbated by the release of various pollutants from coal-burning, including particulate matter and SO2. However, the depletion of the ozone layer, commonly referred to as the ozone hole, is primarily caused by chlorofluorocarbons (CFCs) and not emissions from coal combustion.

The real answer is:

water at 15°C

Answer:

The answer is Water at 15°C

Explanation:

Levers often have a greater mechanical advantage than inclined planes because they can amplify force more efficiently over shorter distances. Inclined planes reduce the force needed by increasing the distance, but the work done remains the same; friction can additionally reduce the inclined plane's efficiency.

When comparing the mechanical advantage (MA) of simple machines such as the lever and the inclined plane, the reason that the lever often has a greater efficiency than the inclined plane has to do with the amount of work done and the distance over which the force is applied.

An inclined plane increases the distance over which the force must be applied to move an object to the same height, thus reducing the input force needed. However, because that distance is increased, the force must be applied over a longer path, which may result in similar amounts of work being done as lifting the object straight up. The MA of an inclined plane can be calculated using the formula MA=1/sin θ.

The lever, on the other hand, operates based on the distances from the fulcrum to the points of application of the effort and load forces. The ratio of these distances determines the MA. With levers, it is possible to gain a significant MA even over a short distance, allowing more efficient force amplification, usually without the same extent of motion required by an inclined plane.

Furthermore, when comparing the two machines, friction may play a minor role. As the inclined plane involves a greater travel distance, the opportunity for friction to affect the work done is increased, potentially reducing the system's efficiency compared to a lever where the interaction points may be more limited and thus less susceptible to energy loss due to friction.

Answer:

Speed, v = 60 m/s

Explanation:

Given that,

Mass of the box, m = 18 kg

Time, t = 6.1 seconds

Initially the box is at rest, u = 0

Let v is the final speed of the box i.e. after 6.1 seconds. We can calculate it using first equation of motion as :

[tex]v=u+at[/tex]

Here, a = g

[tex]v=gt[/tex]

[tex]v=9.8\times 6.1[/tex]

v = 59.78 m/s

or

v = 60 m/s

So, after 6.1 seconds, the box is moving with a speed of 60 m/s. Hence, this is the required solution.

Answer: 0 m/s

The rocket is launched straight upward with a velocity of 90 m/s, At the highest point, the instantaneous velocity would be 0 m/s. The rocket slows down while moving up. The velocity would be 0 m/s at the highest point for an instant and then reverses direction to return on Earth. If it is not controlled, then it would free fall under gravity.

The James Webb Space Telescope is primarily designed to observe infrared radiation, allowing astronomers to view distant galaxies and the earliest stars after the Big Bang. It's equipped with a 6.5-meter diameter mirror and is currently in a stable orbit point around 1.5 million kilometers from Earth.

The James Webb Space Telescope (JWST) is designed primarily to observe infrared radiation from the cosmos. This incredible space telescope was launched in December 2021 and is equipped with a mirror measuring 6.5 meters (21 feet) in diameter, composed of 36 small hexagons, similar to the Keck telescopes. It's named after James Webb, an early NASA administrator.

This telescope will allow scientists to peer farther out in space and back in time than ever before since it's designed to detect far-infrared and millimeter-wave radiation from distant galaxies, whose light has been shifted to long wavelengths because of the vast distances it hastraveledd to reach us. One of the major goals of the JWST is  to observe the light of the first galaxies and stars that came into existence after the Big Bang, approximately half a billion years later.

Observing these wavelengths is crucial as it allows us to gather data that are hidden from visibility due to dust clouds surrounding these galaxies. The JWST is expected to expand our understanding of the universe by providing an unrivaled view of the cosmos.

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