Lana is gliding across the pond on ice skates. By the time she makes it to the
other side of the pond, she has nearly come to a complete stop. Which of the
following forces has caused her to slow down?
A. Gravity
B. Ground reaction force
C. Muscle force
D. Friction

according to question the correct option is b) lii < bas < mgo.

To determine the order of increasing magnitude of lattice energy for the given compounds (MgO, LiI, and BaS), we need to consider the relative strengths of the ionic bonds formed between the cations and anions in each compound.

Lattice energy is a measure of the energy released when 1 mole of a solid ionic compound is formed from its constituent ions in the gas phase. Higher lattice energy corresponds to stronger ionic bonds.

The factors affecting lattice energy include the charge of the ions and the size of the ions. Generally, the higher the charges and the smaller the ions, the stronger the ionic bonds and the higher the lattice energy.

Let's analyze the given compounds:

MgO:

Magnesium (Mg) has a 2+ charge, and oxygen (O) has a 2- charge.

The charges on the ions are the same magnitude as those in LiI and BaS, but the ionic radii of Mg^2+ and O^2- are smaller than those of Li^+ and Ba^2+, respectively.

Therefore, MgO is expected to have a higher lattice energy than LiI and BaS.

LiI:

Lithium (Li) has a 1+ charge, and iodine (I) has a 1- charge.

The charges on the ions are smaller in magnitude than those in MgO and BaS.

LiI is expected to have a lower lattice energy compared to MgO and BaS.

BaS:

Barium (Ba) has a 2+ charge, and sulfur (S) has a 2- charge.

The charges on the ions have the same magnitude as those in MgO, but the ionic radii of Ba^2+ and S^2- are larger than those of Mg^2+ and O^2+, respectively.

Therefore, BaS is expected to have a lower lattice energy compared to MgO but higher than LiI.

Based on the analysis above, the correct order of increasing magnitude of lattice energy is:

b) LiI < BaS < MgO

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(a) The greatest magnification that can be obtained using two lenses is given by the ratio of their focal lengths. Therefore, we need to find the combination of lenses that gives the largest ratio.

The largest ratio is obtained by using the lenses with the shortest and longest focal lengths. Therefore, the greatest magnification is given by: Magnification = focal length of the longer lens / focal length of the shorter lens  Magnification = 28.0 cm / 4.00 cm Magnification = 7.00 To obtain the magnification of a telescope, we need to find the ratio of the focal length of the objective lens to the focal length of the eyepiece lens.

In this case, we are trying to find the combination of lenses that gives the largest ratio, which corresponds to the greatest magnification. We are given four lenses with different focal lengths. To find the largest magnification, we need to choose two lenses that give the largest ratio. This corresponds to choosing the lens with the longest focal length as the objective lens, and the lens with the shortest focal length as the eyepiece lens.

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A star generates 81 times more energy per unit area in a certain amount of time than one with a surface temperature that is three times that of the sun.

The photosphere's thermal emission, which occurs at a temperature of 5700 K, is what gives the Sun's spectrum its smooth portion. Because their photospheres are hotter or colder than the Sun's, respectively, we perceive stars in the sky that are bluer or redder than the Sun.

But how big is the Sun in comparison to these stars? The Stefan-Boltzmann law, which also applies to other objects emitting thermal radiation, connects the size of a star to its temperature and luminosity.

This includes the burning metal burners in electric stoves and the filaments in light bulbs. The brightness L is inversely related to the star's surface area and the fourth power of its surface temperature, according to the law's mathematical formulation.

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Answer:

\(\Huge \boxed{\mathrm{13.5 \ Joules}}\)

Explanation:

\(\sf Kinetic \ energy \ (J)=\frac{1}{2} \cdot mass \ (kg) \cdot (velocity \ (m/s)) ^2\)

\(\mathrm{KE=\frac{1}{2} mv^2}\)

The mass of the ball is 3 kg.

The velocity of the ball rolling is 3 m/s.

\(\mathrm{KE=\frac{1}{2} \cdot 3 \cdot 3^2}\)

Evaluating and solving for kinetic energy.

\(\mathrm{KE=\frac{1}{2} \cdot 3 \cdot 9}\)

\(\mathrm{KE=\frac{1}{2} \cdot 27}\)

\(\mathrm{KE} =13.5\)

The kinetic energy of the ball is 13.5 Joules.

Answer:

Kinetic energy =1/2mv^2.

1/2×3×3^2.

1/2×27=13.5 or 13 whole number 1/2.

Answer:

See the answers below

Explanation:

The data of 100W means power, and the other data of 220V means voltage, that is to say that bulb serves to work at a voltage of 220V100W datum means power.

J means work that is given in Joules [J], we must remember that power is defined as the relationship between work at a certain time, therefore we can determine work by means of the following expression.

\(P=W/t\\\)

where:

P = power [Watt]

W = work [J]

t = time [s]

\(W=P*t\\W=100*5[hr]*[\frac{3600s}{1hr} ]\\W=1800000[J] = 1.8[MJ]\)

Now the electric cost.

\(0.1[kW]*5[hr]*55\frac{LL}{1kwhr} =27.5[LL]\)

Detached listening can hinder effective communication and understanding between individuals. It is important for Jim to be actively involved and attentive during his meeting with his academic advisor to ensure he receives the necessary guidance and support for his academic decisions.

Jim is displaying the style of listening known as "detached." This style of listening is characterized by a lack of attention, interest, or engagement in the conversation. Jim's distraction with social media on his phone shows that he is not actively participating or focusing on what his academic advisor is saying. Additionally, his belief that the conversation is pointless because he plans to change his major indicates a disinterest in the discussion and a lack of motivation to actively listen and engage with his advisor.

Detached listening can hinder effective communication and understanding between individuals. It is important for Jim to be actively involved and attentive during his meeting with his academic advisor to ensure he receives the necessary guidance and support for his academic decisions. By actively participating and listening, he can make more informed choices about his major and benefit from the advice and expertise of his advisor.

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Jim is displaying detached listening as he is being physically present in conversation with his academic advisor but his focus is elsewhere, particularly, his phone.

The style of listening that Jim is displaying is detached. This is because he is not paying attention to his advisor and is instead distracted by his phone. Detached listening is when one is physically present in a conversation but not mentally or emotionally engaged. Examples include browsing on the phone or thinking about other things while someone is talking.

In contrast, active or involved listening would involve fully concentrating, understanding, responding, and then remembering what is being said. Considering that Jim is mainly focused on his phone, he is not displaying any signs of this type of engagement with his advisor, hence, detached is the appropriate choice to describe his listening style.

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Electric current is the rate of flow of electric charges measured in ampere (A).

Electric charge can be positive of negative. The rate of flow of electric charges is known as current, measured in units of ampere.

Q = It

where;

\(I = \frac{Q}{t}\)

Thus, electric current is the rate of flow of electric charges measured in ampere (A).

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C. A proton is a positively charged particle that is located inside the nucleus of an atom.

The resistance of a circuit that contains two 50.0 Ω resistors connected in series with a 12.0 V battery is 100 Ω. The resistance of the circuit is equal to the sum of the individual resistors when they are connected in series.

In this case, two 50.0 Ω resistors are connected in series, resulting in a total resistance of 100 Ω. Resistance can be defined as the obstruction that electricity faces when it travels through a conductor. The greater the resistance, the less current is allowed to flow through the circuit. The following equation is used to calculate resistance: R = V / IWhere R is resistance, V is voltage, and I is current.

Resistance can also be calculated using Ohm's Law if we know the values of voltage and current. When resistors are connected in series, the total resistance of the circuit is equal to the sum of the individual resistors. This is expressed by the following equation:RT = R1 + R2 + ... + RNWhere RT is the total resistance of the circuit, and R1, R2, and RN are the individual resistors. In this case, the circuit contains two 50.0 Ω resistors connected in series.

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Answer:

See explanation

Explanation:

1) There are two main types of waves;

Mechanical waves and electromagnetic waves.

Mechanical waves usually require a medium for propagation, e.g sound, waves on a spiral spring, etc

Electromagnetic waves do not require a medium for propagation e.g microwaves, x-rays etc

2) The phenomenon is known as refraction. Refraction occurs at the boundary between two media because of the change in the speed of a wave as it moves from one medium to another.

The Nyquist frequency for a sampling frequency of 1000 Hz is 500 Hz (half the sampling frequency). Any signal above this frequency will be aliased.

The highest frequency played by Dr. Lee's son is 523.2 Hz, which is less than the Nyquist frequency, so it will not be aliased. However, the other frequencies will be aliased as follows:

261.6 Hz will be aliased as 738.4 Hz (1000 Hz - 261.6 Hz)

293.7 Hz will be aliased as 706.3 Hz (1000 Hz - 293.7 Hz)

329.6 Hz will be aliased as 670.4 Hz (1000 Hz - 329.6 Hz)

349.2 Hz will be aliased as 650.8 Hz (1000 Hz - 349.2 Hz)

392.0 Hz will be aliased as 608.0 Hz (1000 Hz - 392.0 Hz)

440.0 Hz will be aliased as 560.0 Hz (1000 Hz - 440.0 Hz)

493.9 Hz will be aliased as 506.1 Hz (1000 Hz - 493.9 Hz)

Therefore, the frequencies that will be present in the reconstructed signal (different from the original frequencies) are 506.1 Hz, 560.0 Hz, 608.0 Hz, 650.8 Hz, 670.4 Hz, 706.3 Hz, and 738.4 Hz.

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A chemical change is the transformation of one substance into another, the emergence of new compounds with distinct properties, or any combination of these. It happens when two compounds mix to create a new material (synthesis or either decomposes to form more substances).

A substance is defined as matter with a certain composition and particular qualities. Everything that is pure is a substance. A substance is every pure compound. Several chemicals are: Since iron is an element, it qualifies as a material. Methane is a substance since it is a compound.

Naturally Occurring Substances: Substances that exist in the environment naturally yet nonetheless pose a risk to businesses in terms of environmental responsibility. Examples include radon, pyrite, asbestos, mercury, arsenic, and asbestos. The majority of these materials are found while being developed or built.

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ohm's law is a formula used to calculate the relationship between voltage, current, and resistance in an electrical circuit. To students of electronics, ohm's law (e =ir) is as fundamentally important as einstein's relativity equation ( e= mc2) is to physicists. e = l x r. rest is on Goo gle

The acceleration and net force must both be zero if an object is travelling continuously to the right at a constant speed.

Newton's first law states that any object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the application of an external force. The tendency to resist changes in a motion situation is known as inertia.

The only time two objects have the same velocity is when they are going in the same direction and at the same speed. Objects moving at varying rates, in varying directions, or in both directions exhibit variable velocities.

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In a load of 5 cubic meters of topsoil, the approximate volume of solid material would depend on the type of topsoil and its composition. However, in general, topsoil is composed of organic matter, minerals, water, and air.

The amount of each component varies depending on factors such as the location, climate, and type of vegetation present. In most cases, the organic matter and minerals account for the majority of the volume, with water and air occupying the remaining space.

The solid material in topsoil is made up of minerals, which include sand, silt, and clay particles. These particles are responsible for providing the soil with its texture, structure, and fertility. The size of the particles determines the texture of the soil, with sand being the largest and clay being the smallest.

Therefore, the amount of solid material in a load of 5 cubic meters of topsoil would depend on the type of topsoil and its composition. However, based on the average composition of topsoil, it can be estimated that approximately 3-4 cubic meters of the volume would be solid material. This means that the remaining 1-2 cubic meters would be occupied by water and air.

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The motion is defined as the change in position with respect to time. Force is defined as the product of the mass and acceleration of the object. Power is defined as the work per unit of time.

From the given,

The first image shows the ball is at rest. By using, Newton's first law of motion is defined as the object continuing to be at rest or in uniform motion unless an external force acted on it. If the ball is kicked, the ball which is initially at rest starts to move depending on the applied external force.

The ball moves in a particular direction and hence force is the vector quantity. When the force acts on the ball, work is done, and is equal force and displacement.

The second image shows the car in motion. The car moves in a particular direction, speed of the car gives velocity. Velocity is the vector quantity and the momentum is defined as the product of mass and velocity. When there is a change in velocity, gives rise to acceleration. Acceleration gives force by using Newton's second law of motion.

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A gold leaf electroscope's cap develops a negative charge when a negatively charged rod is brought close to it; the case is then grounded, creating a negative charge in the leaf. Option D is correct.

When the matter is put in an electromagnetic field, it has an electric charge, which causes it to experience a force. A positive or negative electric charge can exist.

Similar charges repel each other, whereas dissimilar charges attract each other.

The term "neutral" refers to an item that has no net charge. A charge is something experienced as a force in the electric and magnetic fields.

When a negatively charged rod is brought near the cap of a gold leaf electroscope whose case ad then is earthed, then the leaf has an induced negative charge.

Hence option D is correct.

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Answer:

Matter is any substance that has mass and takes up space by having volume

The physics problem to find the unknown has applied physics principles will be the following:

The simplified expression for coefficient of kinetic friction is 0.097.

The given parameters:

g = 9.8 m/s²

a = 3.6 m/s²

θ=27.0∘

The simplified expression for coefficient of kinetic friction is calculated as follows;

μkmgcosθ = mgsinθ − ma

m(μkgcosθ) = m(gsinθ − a)

μkgcosθ = gsinθ − a

The practise of using physics as a science to assist people and address their issues is known as applied physics.

Engineering is distinct from it since engineers deal with clearly defined problems. Applying physics to the development of new technologies or the resolution of engineering issues is the work of applied physicists.

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Answer:Falling objects form an interesting class of motion problems. For example, we can estimate the depth of a vertical mine shaft by dropping a rock into it and listening for the rock to hit the bottom. By applying the kinematics developed so far to falling objects, we can examine some interesting situations and learn much about gravity in the process.

Explanation:

When a 20N force is applied to the front of the spacecraft and a 20N force is applied to the back of the spacecraft, the net force acting on the spacecraft will be zero.

This is because the forces applied to the front and back of the spacecraft are equal in magnitude and opposite in direction, thereby canceling each other out. As a result, the spacecraft will continue drifting at its constant speed of 500m/s.

A spacecraft is a vehicle designed to operate in outer space. It can be manned or unmanned, and can travel to different parts of the solar system and beyond. Spacecraft use a combination of rocket propulsion, gravity assist, and other techniques to reach their destinations.

They are used for scientific exploration, military purposes, and commercial activities such as satellite deployment and space tourism. Spacecraft have played a crucial role in advancing our understanding of the universe and expanding our capabilities in space.

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The natural frequency of the given system can be found out by considering the equilibrium position of the system. The system is made up of two weights and a rigid bar. The lump weight W is located at a distance of l from the fixed point. We need to determine the natural frequency of the system as per the given data.

The frequency of the system is determined using the formula shown below; where f is the natural frequency, k is the stiffness and m is the mass of the system. Consider the system shown below: Let the mass of the rigid bar be M and length be L.

The weight W is located at a distance l from the fixed point. Its weight can be given as;where g is the acceleration due to gravity.The potential energy in the spring is given as;

The kinetic energy of the system is given by; As per the principle of conservation of energy, the sum of potential and kinetic energy of the system is constant.

Let this constant be denoted by E. Substituting the respective values of potential and kinetic energy in the above equation, we get; Differentiating the above equation with respect to time t, we get;

Now, substituting the respective values in the above equation, we get;

Solving the above equation for f, we get;Therefore, the natural frequency of the given system is;

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Heat waves are defined by the difference in temperature compared to the normal temperature typical of a region.

A heatwave happens when a location has extremely high maximum and minimum temperatures over the course of three days. This is taken into account in light of the area's climate and previous weather patterns.

An protracted period of unusually warm weather that frequently lasts longer than two days is known as a heat wave. Heat waves can occur both with and without a lot of humidity. They can spread out across a large region, placing many people in danger of extreme heat.

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When the switch is closed, in the third circuit the resistance would be the highest and the current be the lowest.

From the question, we have

Voltage in the circuit, V = 1.5 volts,

The circuit's resistance, R = 50,

In the third diagram, the bulb is connected in parallel, which means that the voltage in the circuit will remain constant. Additionally, because the current depends on the resistor, the resistance in this circuit will be larger.

Additionally, according to Ohm's law, a high resistance will result in a low current flow.

Since there is only one bulb in the first circuit, resistance will be minimal and current flow will be high.

As a result, the third circuit's resistance would be the highest and its current the lowest when the switch is closed.

Current :

The phrase "electric current" is frequently used to describe how much electricity flows through a circuit and how it flows in an electronic circuit. Amperes are used to measure it (A). As more electricity passes through the circuit, the ampere value increases.

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When the switch is closed, in the third circuit the resistance would be the highest and the current be the lowest.

What is current?

When describing how much electricity flows through a circuit and how it flows in an electronic circuit, the term "electric current" is often employed. It is measured in amperes (A). The ampere number rises as more electricity flows through the circuit.

Given:

The Voltage in the circuit, V = 1.5 volts,

The resistance in the circuit, R = 50 Ω,

As you can see in the third diagram, there is a parallel connection of the bulb, so the voltage in the circuit will remain the same and the current depends on the resistor, so there will be higher resistance in this circuit.

And if the resistance is high the current flow will be low, (By Ohm's law)

In the first circuit, there is only one bulb, so resistance will be low, and the current flow will be high.

Therefore, when the switch is closed, in the third circuit the resistance would be the highest and the current be the lowest.

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The acceleration due to gravity on asteroid X is approximately  0.5 meter/secon^2. Hence, option (D) is correct.

The acceleration an object experiences as a result of gravitational force is known as acceleration due to gravity. M/s^2 is its SI unit. Its vector nature—which includes both magnitude and direction—makes it a quantity. The letter g stands for gravitational acceleration.

Given that:  An astronaut weighs 500 Newtons on Earth and 25 newtons on asteroid X.

Hence,  The acceleration due to gravity on asteroid X is :

= acceleration due to gravity on Earth × (25 N/500N)

= 10 meter/secon^2 × (1/20)

= 0.5 meter/secon^2 ( approx.)

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Answer:

The mineral's hardness is greater than 4 but less than 5.5 on the Mohs hardness scale.

Answer:

2730.304 KJ

Explanation:

 How much heat is required to convert 0.8 kg of ice at  -35°C into steam at 100 C?

Given that:

mass of ice (m) = 0.8 kg = 800 g

Initial temperature (\(T_i\)) = -35°C = 238 K

final temperature (\(T_n\))= 100°C = 373 K

Specific heat of ice (\(S_i\)) = 2.108 J/g.K

Specific heat of water (\(S_w\)) = 4.18 J/g.K

Latent heat of fusion (\(L_f\)) = 334 J/g.

Latent heat of vaporization (\(L_v\)) = 2230 J/g.

\(\Delta T=T_n-T_i=373-238=135K\)

Total heat (Q) required to increase the temperature of ice from the initial temperature of 238K to final temperature of 373 K is given by the equation:

\(Q=m\Delta TS_i+m\Delta TS_w+mL_f+mL_v\\Q=800(135)*2.108+800(135)*4.18+800*334+800*2230\\Q=227664+451440+267200+1784000=2730304J\\Q=2703.304KJ\)

Answer:

electrons neutrons and protons

Explanation:

electron are negative

nuetron are neutral

protons are positive

The most likely causes of electrons being emitted in the photoelectric effect is an increase in the intensity of the light, a decrease in the threshold energy of the photons, or a change  in the material of the emitter to one with a higher work function.

The photoelectric effect is a phenomenon in which electrons are emitted from a material when it is exposed to light. This is a result of the absorption of energy from photons, the particles that make up light. The photoelectric effect was first discovered in 1887 by Heinrich Hertz and was later explained by Albert Einstein in 1905. The effect has since been used in a variety of devices, such as photomultipliers and photodiodes, which are widely used in scientific experiments and everyday applications.

Intensity is a measure of the amount of energy present in the light, and increasing the intensity can result in a higher number of photons with enough energy to be emitted from the emitter. Decreasing the threshold energy of the photons means that photons with less energy can be emitted, which would result in electrons being emitted. Changing the material of the emitter to one with a higher work function means that photons with lower energy can be emitted, again resulting in electrons being emitted.

Overall, the changes that would cause electrons to be emitted in the photoelectric effect are increasing the intensity of the light, decreasing the threshold energy of the photons, or changing the material of the emitter to one with a higher work function.

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