15. To use your left hand to determine the direction of the voltage developed in a moving conductor in a stationary magnetic field, you must point your A. forefinger in the direction of the motion. B. forefinger in the direction of the lines of force. C. thumb in the direction of the electromagnetic force. D. thumb in the direction of the magnetic flux.

consider the motion of rocket until it runs out of fuel

v₀ = initial velocity = 0 m/s

v = final velocity when it runs out of fuel = ?

t = time after which fuel is finished = 3.98 sec

a = acceleration = 29.4 m/s²

Y₀ = height gained when the fuel is finished = ?

using the kinematics equation

v = v₀ + a t

v = 0 + (29.4) (3.98)

v = 117.01 m/s

using the equation

v² = v²₀ + 2 a Y₀

(117.01)² = 0² + 2 (29.4) Y₀

Y₀ = 232.85 m

consider the motion of rocket after fuel is finished till it reach the maximum height.

Y₀ = initial position = 232.85 m

Y = final position at maximum height

v₀ = initial velocity just after the fuel is finished = 117.01 m/s

v = final velocity after it reach the maximum height = 0 m/s

a = acceleration due to gravity = - 9.8 m/s²

using the kinematics equation

v² = v²₀ + 2 a (Y - Y₀)

inserting the values

0² = (117.01)² + 2 (- 9.8) (Y - 232.85)

Y = 931.4 m

The total distance traveled by the rocket above the ground is 931.4 m.

The given parameters;

The distance traveled by the rocket during the 3.98 s is calculated as follows;

[tex]h_1 = v_0t + \frac{1}{2} at^2\\\\h_1 = 0 + \frac{1}{2} (29.4)(3.98)^2\\\\h_1 = 232.85 \ m[/tex]

The final velocity of the rocket after 3.98 s is calculated as follows;

[tex]v_i= v_0 + at\\\\v_i= 0 + (29.4 \times 3.98)\\\\v_i = 117.01 \ m/s[/tex]

"when the rocket runs out of fuel, it moves at a constant speed and the acceleration is zero. The rocket will be moving against gravity."

The distance traveled by the rocket when it runs out of fuel is calculated as follows;

[tex]v_f^2 = v_i^2 - 2gh_2[/tex]

where;

[tex]0 = (117.01)^2 -2(9.8)h_2 \\\\2(9.8)h_2 = (117.01)^2\\\\h_2 = \frac{ (117.01)^2}{2(9.8)} \\\\h_2 = 698.54 \ m[/tex]

Total distance traveled by the rocket above the ground;

H = h₁ + h₂

H = 232.85 m + 698.54 m

H = 931.4 m

Thus, the total distance traveled by the rocket above the ground is 931.4 m.

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If a mineral with a Moh's hardness value of 7 is rubbed against the mineral with a value of 5, the mineral with value 5 get scratched with the mineral with hardness value 7.  

• A scale of relative mineral hardness invented by German scientist Mohs is known as the Mohs scale of hardness or Mohs scale.  

• It is a 10 point scale, with 10 given to mineral diamond as the most hardest mineral, which can scratch the minerals below it, that is, coming below it in the hardness scale.  

• The minerals coming in the 7 scale are Quartz, Citrine, Agate, and Amethyst, and the mineral coming in the 5 scale is apatite.  

• Thus, when one rubs the mineral with 7 hardness with a mineral with 5 hardness, than the mineral with 5 hardness will easily get scratched as it is less harder to the mineral in the 7 scale.  

Thus,  the mineral with value 5 get scratched with the mineral with hardness value 7.

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Answer: to direct light rays to a focal point

Explanation:

A reflecting telescope uses curved mirror as primary and a plane mirror placed at an angle as secondary. A curved mirror is used as primary because this mirror collects the light from distant celestial object and converges its light at focus where the plane mirror is kept at an angle so that the reflected light is received by the eyepiece.

It is used as a curved primary mirror in a telescope because to direct light rays to a focal point.

For the construction of a telescope, the physicist Galileo used a lens of the converging type and a lens of the diverging type. In his telescope, the first lens, called the objective, formed a real image of the object in question.

A reflecting telescope uses curved mirror as primary because this mirror collects the light from distant celestial object and converges its light at focus where the plane mirror is kept at an angle so that the reflected light is received by the eyepiece.

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The correct answer of this question is : Molecular motion or vibration slows down

EXPLANATION :

The kinetic energy of the molecule depends on the molecular motion. Molecules might have different types of kinetic energy depending on the type of substance i.e solid,liquid or gases.

During cooling, we are reducing the temperature of the substance. Due to the decrease of temperature, the molecular speed is also decreased. It is so because the molecular speed is dependent on the temperature of the substance.

Hence, the vibration, rotation or translation motion of the molecule slows down during cooling, which in turn, decreases the kinetic energy of the molecule.

Answer: False

Explanation: The circulatory system of the body consists of the heart, blood vessels and blood. The deoxygenated blood from the body is carried to the heart.

Here, the deoxygentaed blood is converted into oxygenated by removing carbon dioxide from them and making it oxygenated.

The impure blood from the body is collected by the right ventricle and transported to the lungs for purification and then transported to the body.

The correct answer is F (False)

Explanation:

In anatomy, the heart which is the organ in charge of pumping blood to all the body is divided into different sections that include the aorta, the superior vena cava, the right/left atrium, the pulmonary valve, and the right/left ventricles. In the case of the right ventricle, this is a chamber located on the right side of the hearth and the main function of this is to pump blood that is low in oxygen or de-oxygenated blood to the lungs through the pulmonary artery. On the other hand, the left ventricle pumps oxygenated blood to all the body. This implies, it is false the right ventricle transports oxygenated blood to the lungs because it pumps de-oxygenated rather than oxygenated blood.

Answer:

A gliding joint means a freely moving joint in which the articulations allow only gliding motions

Explanation:

The student's question pertains to the physics concept of projectile motion. The mug's trajectory is determined by its initial horizontal velocity, the counter's height, and gravity. One could compute the time it takes for the mug to hit the ground and its initial speed.

This question is about the physics concept of projectile motion. When the beer mug slides off the counter and falls to the ground, it follows a trajectory determined by the initial horizontal velocity at which it was pushed, the height of the counter, and the acceleration due to gravity.

To find out how long it takes for the mug to hit the ground, we can use the equation of motion: h = 0.5gt^2, where h is the height from which the object is dropped (1.14m in this case), g is acceleration due to gravity (approximately 9.8 m/s^2) and t is time. Solving for t gives us the time it takes for the mug to hit the floor.

Once we know the time, we can find the initial horizontal velocity using the formula v = d/t, where v is velocity, d is distance (0.60m) and t is time. This gives us the initial speed at which the mug was slid.

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The amount of chemical energy a substance has is determined by its molecular structure and the type of chemical bonds it contains.

1. Molecular Structure:

  - The arrangement of atoms within a molecule determines its potential energy content.

  - Different substances have varying numbers and arrangements of atoms, leading to differences in chemical energy.

2. Type of Chemical Bonds:

  - Chemical energy is stored in the bonds between atoms within molecules.

  - The strength and type of chemical bonds, such as covalent bonds, ionic bonds, and hydrogen bonds, dictate the amount of energy stored in the substance.

  - Stronger bonds require more energy to break and thus store more chemical energy.

3. Potential Energy:

  - Chemical energy represents the potential energy stored within a substance's chemical bonds.

  - When chemical bonds are broken during a chemical reaction, the stored energy is released as heat or used to perform work.

4. Examples:

  - Substances with complex molecular structures and strong chemical bonds, such as hydrocarbons in fossil fuels, tend to have high chemical energy content.

  - Conversely, simpler molecules with weaker bonds, such as gases like hydrogen and oxygen, have lower chemical energy content.

Therefore, the amount of chemical energy a substance possesses is determined by its molecular structure and the type of chemical bonds it contains, with stronger bonds and more complex structures generally correlating with higher chemical energy content.

The complete Question is given below:

What determines the amount of chemical energy a substance has?

For an object that is under the pull of only the force of gravity, the motion is called free-fall. The equations that would allow us to calculate for the speed and distance is,

        Speed = gt

Where g is the acceleration due to gravity and the t is the time.

For the distance, it is calculated through the equation,

     Distance = vt + 1/2gt^2

Where v is the initial velocity and is equal to zero.

The graphs are attached.

(b). The gravitational force between the objects when they are 150 km apart is [tex]\boxed{889\,{\text{N}}}[/tex].

(c). The gravitational force between the objects when they are 50 km apart is [tex]\boxed{8000\,{\text{N}}}[/tex] .

Further Explanation:

The gravitational force of attraction between the two bodies is given by the Newton’s Law of Gravitation. According to Newton’s law of Gravitation, the gravitational force between two bodies is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

The gravitational force is expressed mathematically as:

[tex]F = \dfrac{{G{m_1}{m_2}}}{{{r^2}}}[/tex]

Here, [tex]G[/tex] is the gravitational constant, [tex]{m_1}[/tex] is the mass of first body, [tex]{m_2}[/tex] is the mass of second body and [tex]r[/tex] is the distance between two bodies.

For two bodies kept at a distance of 100 Km , the gravitational force of attraction is 2000 N.

Substitute 200 N for [tex]F[/tex] and 100 Km for r in above equation.

[tex]\begin{aligned}2000=\frac{{G{m_1}{m_2}}}{{{{\left( {100\times {{10}^3}}\right)}^2}}}\hfill\\G{m_1}{m_2} = 2\times {10^{13}}\hfill\\\end{aligned}[/tex]

Part (b):

Now, the force experienced by the bodies when they are 150 Km apart is:

[tex]F = \dfrac{{G{m_1}{m_2}}}{{\left( {150 \times {{10}^3}}\right)}}[/tex]

Substitute [tex]2 \times{10^8}[/tex] for [tex]G{m_1}{m_2}[/tex] in above equation.

[tex]\begin{aligned}F&=\frac{{2 \times {{10}^{13}}}}{{{{\left( {150 \times {{10}^3}}\right)}^2}}}\\&= 888.9\,{\text{N}}\\&\approx {\text{889}}\,{\text{N}}\\\end{aligned}[/tex]

Thus, the gravitational force between the objects when they are 150 Km  apart is [tex]\boxed{889\,{\text{N}}}[/tex].

Part (c):

Now, the force experienced by the bodies when they are 50 km apart is:

[tex]F =\Dfrac{{G{m_1}{m_2}}}{{\left( {50 \times {{10}^3}}\right)}}[/tex]

Substitute [tex]2 \times {10^8}[/tex] for [tex]G{m_1}{m_2}[/tex] in above equation.

[tex]\begin{aligned}F &=\frac{{2 \times {{10}^{13}}}}{{{{\left({50 \times {{10}^3}}\right)}^2}}}\\&= 8000\,{\text{N}}\\\end{aligned}[/tex]

Thus, the gravitational force between the objects when they are 50 Km  apart is  [tex]\boxed{8000\,{\text{N}}}[/tex].

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Answer Details:

Grade: College

Subject: Physics

Chapter: Newton’s law of Gravitation

Keywords:  Gravitation, newton’s law, force of attraction, 2000N, 100km, 150 km, 50 km, gravitational force, two spherical objects, 889 N, 8000 N.

Encoding is a cognitive process happening at all stages of learning - acquisition, storage, and retrieval. It's crucial for learning new information or skills and happens continuously.

Encoding information occurs throughout the entire learning process. This cognitive process is essential in enabling us to acquire, store, and retrieve information. For example, while learning a new language, you first encode the foreign words and their meanings (acquisition), then store that encoded information in your memory (storage), and finally recall those words during a conversation (retrieval). Therefore, encoding is a continuous cycle that occurs throughout the process of learning any subject or skill.

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The boiling point of oxygen is 90.2 K or -183.15 °C.

Answer:

When insulating materials rub against each other, they may become electrically charged . Electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. The material that gains electrons becomes negatively charged.

Explanation:

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A positive entropy change (delta S) indicates that the system has become less ordered, as there is an increase in the number of possible microstates. This is aligned with the Second Law of Thermodynamics, which states that entropy increases in spontaneous processes, leading to greater disorder.

When a system undergoes a change and the entropy change (δS) is positive, this implies that the order of the system has decreased. This is because positive entropy reflects an increase in the number of microstates or possible configurations that the system can adopt, leading to a less ordered, more random state. A common example is the melting of a solid into a liquid where the rigid structure of the solid is lost, providing the particles more freedom to move in the liquid state, which translates into an increased entropy.

As per the Second Law of Thermodynamics, for all spontaneous processes in the real world, the change in entropy is positive (dδS > 0), which is consistent with the natural tendency for systems to move towards greater disorder and randomness. This concept is fundamental in predicting the spontaneous direction of chemical and physical processes. For instance, when a liquid freezes into a solid, the process is accompanied by a negative entropy change, signifying increased order in the system.

Final answer:

A positive entropy change (δS > 0) means that the order of the system has decreased, leading to a more disordered and randomized state with more microstates. This is in line with the Second Law of Thermodynamics, which predicts that the entropy of an isolated system tends to increase in spontaneous processes.

Explanation:

When the entropy change (δS) is positive, it indicates that the order of the system has decreased. This is because a positive δS suggests that the number of microstates and, therefore, the randomness of the system has increased. For example, when a solid changes into a liquid, there is an increase in entropy because the liquid state allows the particles more freedom of movement and positioning, leading to a higher number of microstates compared to the solid state. If the process were reversed and the liquid turned into a solid, δS would be negative, signifying a decrease in entropy as the system becomes more ordered.

Furthermore, the Second Law of Thermodynamics asserts that for any spontaneous process, the entropy of an isolated system will increase. This means the system will move towards a state with more microstates or higher disorder. It aligns with the observation that in irreversible processes, entropy tends to increase, indicating a spontaneous change in an isolated system.

In conclusion, a positive entropy change (δS > 0) aligns with the expectation that there are more microstates available in the final state compared to the initial one, resulting in a decrease in the orderliness of the system. The increase in entropy reflects the fundamental tendency for systems to evolve towards states of higher disorder and randomness.

The most accurate number for a population in an area is measured by adding the individuals living or born in an area and subtract those who die. So, option C.

The amount of people living in a particular area is called population density.

The majority of the time, it applies to people, but occasionally it also does to other living things. It is a significant geographic term. Population density is the total number of people residing in a certain area per square kilometer, or other units of land area.

Demography is the statistical study of populations and how they change through time.

Population size, or the total number of people, and population density, or the number of people per unit of space or volume, are the two most important measurements of a population.

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Final answer:

The most accurate way to measure population size is by adding the number of births and individuals present, while subtracting the number of deaths (which corresponds to option C). Sampling techniques like quadrats and mark-recapture are often used due to the impracticality of counting all individuals.

Explanation:

In the context of estimating population size, the most accurate measurement for a population in an area would be to add the individuals living or born in an area and subtract those who die (Option C). This method accounts for natural population changes such as births and deaths.

Although counting all individuals would provide the most precise number, this is often not feasible. Instead, scientists often use sampling techniques to estimate population size. For stationary or slow-moving organisms, a quadrat can be used, while for mobile organisms, methods like mark and recapture might be employed.

Carrying capacity is a separate concept indicating how many individuals an area can sustain based on resources. Adjustments to population estimates may be necessary when populations near their carrying capacity, as density-dependent factors might affect population growth.

Answer:

electricity

Explanation:

just got the question and it was right