Moreover, as any observer of team sports fans can see, the "cooperate to compete" instinct is particularly strong among that segment of the population that likes war: young men. Psychologist Mark Van Vugt calls this the

Answer: The color is orange, the state of matter is liquid

Explanation:

The tides on Earth are an example of the universal law of gravitation. As they are caused by the gravitational forces exerted by the Moon and the Sun on our planet.

The universal law of gravitation, formulated by Sir Isaac Newton, states that every particle in the universe attracts every other particle with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

In the case of tides on Earth, the primary forces at play are the gravitational forces exerted by the Moon and the Sun. Although the Sun is much larger than the Moon, it is also much farther away from Earth. Therefore, the gravitational force exerted by the Moon is stronger than that of the Sun.

The tidal bulges that occur on Earth are a result of the difference in gravitational forces exerted by the Moon on different parts of our planet. As the Earth rotates on its axis, different regions of the Earth experience varying gravitational forces from the Moon. This causes the water on Earth's surface to be pulled towards the Moon, resulting in high tides.

Similarly, there is another high tide on the opposite side of the Earth, known as the "opposite tide." This occurs because the gravitational force exerted by the Moon is weaker on this side, causing the water to be pulled away from the Moon.

The tides on Earth are a direct result of the universal law of gravitation, as they are caused by the gravitational forces exerted by the Moon and the Sun on our planet. Newton's first, second, and third laws of motion are not directly applicable to explaining the phenomenon of tides.

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Answer:

(D) is visible light

Explanation:

(F) is xray and (B) is radio

Answer:

cannot

Explanation:

because convection occurs to difference in densities between particles and there is a movement of particles during convection ( gases and liquids ) , in solids , atoms are very tightly packed and cannot move

Answer:

if we drop it and not throw it then

after 0.75 how fast the book is falling is given by its velocity as

v= at

= 9.8 × 0.75

=7.35 m/s

When the diameter of one telescope is twice that of another, the larger telescope will have four times the collecting area of the smaller one.

The collecting area of a telescope is proportional to the square of its diameter. A telescope's diameter is important because it determines the amount of light that enters the instrument. The amount of light that a telescope can gather is proportional to the square of its diameter. This means that if one telescope has a diameter twice that of another, it can gather four times as much light.

In other words, the collecting area of a telescope is proportional to the square of its diameter. This means that if one telescope has a diameter twice that of another, its collecting area is four times greater than that of the smaller telescope. Therefore, the larger telescope will produce brighter images than the smaller one.

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Answer:

A horizontal line on a phase change graph means there has been

no change. Often longer periods of research are needed to see

significant change.

Kinetic energy is half of the total energy when displacement is half the amplitude in simple harmonic motion.

In simple harmonic motion, a block attached to a spring undergoes back and forth oscillations on a horizontal frictionless surface.

The total energy of the system is 50.0 J.

When the displacement is half the amplitude, we need to find the kinetic energy of the block.

The amplitude is the maximum displacement from the equilibrium position.

At this point, the block's potential energy is maximum and kinetic energy is zero.

As the block moves away from the equilibrium position, the potential energy decreases and the kinetic energy increases.

When the displacement is half the amplitude, the potential energy is 25.0 J.

Therefore, the kinetic energy must also be 25.0 J, since the total energy of the system remains constant.

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Explanation:

When a constant force acts upon an object the acceleration of the object varies inversely with its mass.

\(a\propto \dfrac{1}{m}\)

or

\(\dfrac{a_1}{a_2}=\dfrac{m_2}{m_1}\)

If m₁ = 21 kg, a₁ = 3 m/s², m₂ = 9 kg

We need to find a₂

So,

\(a_2=\dfrac{m_1a_1}{m_2}\\\\a_2=\dfrac{21\times 3}{9}\\\\a_2=7\ m/s^2\)

So, if mass is 9 kg, its acceleration is 7 m/s².

Answer:

A AND B

Explanation:

Answer:

Electromagnetic field, a property of space caused by the motion of an electric charge. A stationary charge will produce only an electric field in the surrounding space. If the charge is moving, a magnetic field is also produced. An electric field can be produced also by a changing magnetic field.

Given data:

* The mass of the student is m = 65 kg.

* The distance covered by the student is d = 100 m.

* The time taken by the student to cover the distance is t = 12 seconds.

Solution:

(a). The velocity of the student is,

Thus, the velocity of the student is 8.33 meters per second.

(b). The kinetic energy of the student is,

Thus, the kinetic energy of the student is 2255.14 J.

(c). The mechanical energy of the student is the energy acquired by the student during its motion.

Thus, the mechanical energy of the student is 2255.14 J.

The right cap would be of the same height as the left cap.

It is said that a particle is in equilibrium when there is no net external force acting on it.

The particle is either at rest or moving uniformly, according to Newton's First Law of Motion, which we can apply to this situation.

According to physics, a system is said to be in equilibrium when neither its internal energy state nor its state of motion tend to change over time.

Concurrent forces are those that operate simultaneously at a given point. When the outcome equals zero, these forces are said to be in equilibrium.

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The amount of oxygen molecules present in the steel calorimeter is approximately 4.67 × 10^20 molecules.

The number of oxygen molecules in the steel calorimeter can be found using the ideal gas law equation: n = (PV) / (RT), where P is pressure, V is volume, R is the ideal gas constant, and T is temperature in Kelvin. Given that the volume of the steel calorimeter is 75.0 mL, we convert it to liters by dividing by 1000, resulting in V = 0.075 L. The temperature is provided as 22.5°C, so we convert it to Kelvin by adding 273.15, giving T = 295.65 K. The ideal gas constant R is approximately 8.314 J/(mol·K). Now, we substitute the values into the equation, we get the answer. n = (255 kPa * 0.075 L) / (8.314 J/(mol·K) * 295.65 K)

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Answer:

Explanation:

A simple pendulum consists of a mass (usually represented as a small object or bob) attached to a string or rod of negligible mass. The mass is free to swing back and forth under the influence of gravity.

In the figure, the point of suspension is denoted by "O," and the mass (bob) is represented by the small circle. The string or rod is represented by the vertical line connecting the point of suspension to the bob.

Amplitude:

The amplitude of a pendulum refers to the maximum displacement or swing of the bob from its equilibrium position. In the figure, the amplitude can be represented by the angle formed between the vertical position and the position of the bob when it swings to its maximum distance on one side. It is usually denoted by the symbol "A."

Effective Length:

The effective length of a pendulum refers to the distance from the point of suspension to the center of mass of the bob. It represents the distance over which the mass swings back and forth. In the figure, the effective length can be measured as the length of the string or rod from the point of suspension to the center of the bob. It is usually denoted by the symbol "L."

It is important to note that the amplitude and effective length of a simple pendulum affect its period of oscillation (the time taken for one complete swing). The relationship between these parameters and the period can be described by mathematical formulas.

Overall, the simple pendulum is a fundamental concept in physics and provides a simplified model for understanding oscillatory motion and the principles of periodic motion.

Answer:

Explanation:

The International System of Units (SI, abbreviated from the French Système international (d'unités)) is the modern form of the metric system. It is the only system of measurement with an official status in nearly every country in the world. It comprises a coherent system of units of measurement starting with seven base units, which are the second (the unit of time with the symbol s), metre (length, m), kilogram (mass, kg), ampere (electric current, A), kelvin (thermodynamic temperature, K), mole (amount of substance, mol), and candela (luminous intensity, cd).

Hope it helps you!

Answer:

Explanation:B

Answer:

Boiling a kettle is an example of both thermal and kinetic energy. Thermal energy comes from a substance whose molecules and atoms are vibrating faster due to a rise in temperature. Heat energy is another name for thermal energy. Kinetic energy is the energy of a moving object.

it's kinetic!

The longest "standing wave" on a fixed string is known as the fundamental mode or the first harmonic. In this mode, the string forms a single loop with an antinode in the middle and nodes at both ends. The wave pattern appears as a single half-wavelength.

If we denote the length of the string as L, the wavelength (λ) of the longest-standing wave in the fundamental mode is equal to twice the length of the string (2L). In other words, the wavelength of the wave is exactly two times the length of the string. To visualize this, imagine a string fixed at both ends and vibrating in its fundamental mode. The wave pattern will exhibit a single loop (one-half of a wavelength) spanning the entire length of the string. The antinode will be positioned in the middle of the string, while the nodes will be located at the fixed ends. In summary, for the longest "standing wave" on a fixed string (fundamental mode), the wavelength is twice the length of the string.

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If an identical spring were connected in parallel with another spring, the spring constant of the combined system would increase.

This means that a larger mass would be required to produce the same amount of extension. To calculate the mass needed to produce an extension of 15cm, we would need to know the spring constant of the individual springs and the total spring constant of the combined system. Assuming that the individual springs have the same spring constant (k) and are connected in parallel, the total spring constant (k_total) can be calculated as:
       k_total = k + k = 2k
Using Hooke's Law (F = -kx), we can calculate the force required to produce an extension of 15cm:
       F = -k_totalx = -(2k)(0.15m) = -0.3kN
To find the mass required, we can use the formula:
       F = ma
Where F is the force, m is the mass, and a is the acceleration due to gravity (9.81 m/s^2).

       m = F/a = (-0.3kN) / (9.81 m/s^2) = -30.6 kg
Therefore, a mass of approximately 30.6 kg would be required to produce an extension of 15cm in a system consisting of two identical springs connected in parallel. identical of spring, including its number of turns, diameter, and wire size, would affect both its material and spring constant in the event of two similar springs with differing lengths. The spring constant of the longer spring would, nevertheless, be lower than the spring constant of the shorter spring if the two springs were composed of the same material and had the same geometry other than their length.

This is due to the fact that the relationship between the spring constant and spring length is inverse. In other words, a spring will extend more under the same force if it is longer. 

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Answer:

Initial y-component of speed

Vy = 28 * sin 30 = 14 m/sec vertically

1/2 m Vy^2 = 2 m g h    conservation of energy of y-component

h = Vy^2 / (2 * g) = 14^2 / (2 * 9.8) = 10 m

Assuming the scooter is moving horizontally on a flat surface, then by Newton's second law, the vertical forces (the normal force and the scooter's weight) cancel out:

n - w = 0

n = w

n = (120 kg) g = 1176 N

(where g = 9.8 m/s²)

Then the friction force has a magnitude of

f = µ n

where µ is the coefficient of kinetic friction, so that

f = 0.4 (1176 N) = 470.4 N ≈ 470 N

Answer:

Explanation:

First part of the journey;

If the car starts from rest, then accelerates at 1.20 m/s^2 for 7.00 s, the total time taken during this period is 7.0s.

But then  lets get the velocity v of the car during its first part of the journey.

Using the formula v1 = u1+ at1

v = 0+1.2(7)

v = 8.4m/s

Second part of the journey is when the driver hits the brake and slowing to stop at a rate of -4.25 m/s^2. To calculate the time it takes by the body to decelerates, we will use the equation of motion v2 = u2 + at2

v = final velocity of the car during the second part of the journey

u = initial velocity of the car during the second part of the journey

a = deceleration

t = time taken

Given v2 = 0m/s, u2 = 8.4m/s, a = -4.25m/s²

0 = 8.4-4.25t2

4.25t2 = 8.4

t2 = 8.4/4.25

t2 = 1.98secs

Total time taken for the journey = t1+t2

= 7.0s + 1.98s

= 8.98secs

The spinning tube of air created by winds moving in opposite directions to tip upwards and become vertical because of the updraft of wind in a supercell. Hence, option (A) is correct.

As a deep, continuously revolving updraft known as a mesocyclone, a supercell is a type of thunderstorm. This causes these storms to occasionally be called spinning thunderstorms.

Supercells, which are the least frequent and have the potential to be the most severe of the four types of thunderstorms (supercell, squall line, multi-cell, and single-cell), are the least common overall.

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Answer:

Yes, the sugar molecules produced from photosynthesis can be rearranged into different compounds to carry out life processes such energy producing compounds, energy storage compounds, body building compounds, and compounds of other types of food

Explanation:

a) The sugar can be broken down in a plant cell to produce ATP and then energy through cellular respiration as follows;

C₆H₁₂O₆ + O₂ 6CO₂ + 6H₂O + ATP

The produced energy can be used as power for cellular activities, such as the synthesis of protein and cell division

b) The produced sugar can be linked together by enzymes to form starch which is a form of chemical storage of energy as follows;

Sugar C₆H₁₂O₆ transformed into starch (C₆H₁₀O₅)ₙ

c) The sugar can be used in building the plant body by forming cellulose which is a form of starch

d) The sugar can be transformed into proteins and fat which are other types of food such as compounds containing sugar produces compounds containing fat based compounds

Answer:

0.25

Explanation:

Answer:

False. Not everything can turn into a black hole. The formation of a black hole requires a massive object, typically a star, to collapse under its own gravity. This collapse causes the object to become so dense that it creates a singularity, a point of infinite density at the center of the black hole, which is surrounded by an event horizon, the point of no return beyond which nothing, not even light, can escape. So, only objects with sufficient mass and gravity can become black holes.

Explanation:

The 0.54°  large an angle in radians and degrees does the diameter of the moon subtend to a person on the earth.

What is radian ?

One radian is defined as the angle that is subtended at its center by an arc of length one unit in a unit circle (a circle with radius one unit). The radian unit of measurement is represented by the letters "rad" or "c".

What is diameter ?

The line through a circle's center with two extremes on its circumference is said to have a diameter. The term "semi-circle" refers to the division of a circle into two equal sections by its diameter. A circle's center is where its diameter meets.

Therefore,  0.54°  large an angle in radians and degrees does the diameter of the moon subtend to a person on the earth.

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