Question 2a: At the moments when the sun is not blocked by clouds on the cloudy day (8/19), we see that the solar radiation around noon is stronger than the solar radiation around noon on the clear day (9/12)? Why would this be?

The new angular speed when the man walks to a point 0 m from the center is 1.41 rad/s.

The change in kinetic energy due to this movement is 193 J.

Part 1

To solve this, use the following equation:

ω = ω_0 × I_0 / I_f

where:

ω = new angular speed

ω_0 = initial angular speed

I_0 = initial moment of inertia

I_f = final moment of inertia

The initial angular speed is given as 0.35 rev/s. The initial moment of inertia is the moment of inertia of the merry-go-round alone. The final moment of inertia is the moment of inertia of the merry-go-round plus the man.

The moment of inertia of a solid cylinder is given by the following equation:

I = mr²

where:

I = moment of inertia

m = mass

r = radius

The mass of the merry-go-round is 50 kg and the radius is 2.5 m. The mass of the man is 86 kg.

Plugging these values into the equation:

I_0 = 50 kg × (2.5 m)² = 312.5 kg m²

I_f = 50 kg × (2.5 m)² + 86 kg × 0 m² = 312.5 kg m²

Plugging these values into the equation for ω:

ω = 0.35 rev/s × 312.5 kg m² / 312.5 kg m² = 1.41 rad/s

Part 2

The kinetic energy of a rotating object is given by the following equation:

K = 1/2 I ω²

where:

K = kinetic energy

I = moment of inertia

ω = angular speed

The initial kinetic energy is the kinetic energy of the merry-go-round alone. The final kinetic energy is the kinetic energy of the merry-go-round plus the man.

Plugging the values for I and ω into the equation for K:

K_0 = 1/2 × 312.5 kg m² × (0.35 rev/s)² = 13.8 J

K_f = 1/2 × 312.5 kg m² × (1.41 rad/s)² = 206.25 J

The change in kinetic energy is K_f - K_0 = 206.25 J - 13.8 J = 193 J.

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Answer:

Its  answer is 2.21 kg.

Explanation:

F =m × a

71 = m × 32

71 ÷ 32 = m

2.21 kg = m

An object accelerates at 32 m/s² when a force of 71 N is applied to it. The object’s mass is calculated as 2.21 kg.

To find the mass, the given values are,

Acceleration = 32 m/s²

Force = 71 N.

Here, the object's mass can be calculated using the formula,

Mass = force/acceleration

        = 71/32

        = 2.21 kg

Hence, the object's mass is 2.21 kg.

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The star is moving away from Earth at a velocity of 1.8 x 106 m/s.

The Doppler Effect describes the shift in wavelength of a wave when the source is moving in relation to the observer. The shift can be observed in sound waves, light waves, and other waves.

The Doppler Effect can be used to determine the velocity of objects moving away from an observer, as in the case of stars moving away from Earth.

The velocity of a star moving away from Earth can be determined using the equation:

v = Δλ/λ x c, Where v is the velocity of the star, Δλ is the shift in wavelength of the spectral line, λ is the wavelength of the spectral line measured in the lab on Earth, and c is the speed of light (3.00 x 108 m/s).

In this case, the shift in wavelength of the spectral line is Δλ = 500.3 nm - 500 nm = 0.3 nm.

The wavelength of the spectral line measured in the lab on Earth is λ = 500 nm.

Plugging in these values to the equation above: v = Δλ/λ x cv = (0.3 nm / 500 nm) x (3.00 x 108 m/s) = 1.8 x 106 m/s.

Therefore, velocity of star 1.8 x 106 m/s.

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It is much easier to balance a thing that has a large base of support and a low center of gravity. The object won't topple over as a result of little center of gravity wobble because of the wide base and low center of gravity. Therefore, balancing a nail on its base as opposed to its tip would be simpler.

The tension to which the screw must be adjusted so that a transverse wave of wavelength 3.33 cm makes 625 vibrations per second is 5.48 N.

The speed of a transverse wave on a string is:

v = sqrt(T/μ)

where v is the speed of the wave, T is the tension in the string, and μ is the linear density of the string.

The frequency of a wave is related to its wavelength and speed by:

f = v/λ

where f is the frequency of the wave and λ is the wavelength.

Combining these equations:

f = sqrt(T/μ) / λ

Solving for T:

T = μf^2λ^2

The linear density of the wire is:

μ = m/L

where m is the mass of the wire and L is its length. Substituting the given values:

μ = 16.5 g / 0.83 m = 19.88 g/m = 0.01988 kg/m

The frequency of the wave is given 625 vibrations per second, which is equivalent to 625 Hz. The wavelength of the wave is given 3.33 cm, which is equivalent to 0.0333 m.

Substituting these values in the equation for tension:

T = \((0.01988 kg/m) * (625 Hz)^2 * (0.0333 m)^2\) = 5.48 N

Therefore, the tension in the wire must be adjusted to 5.48 N so that a transverse wave of wavelength 3.33 cm makes 625 vibrations per second.

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Answer:

The coefficient of friction between all contact surfaces is 0.4. The force, necessary to move the block B with constant velocity, will be (g = 10 m/s)

The coefficient of friction between all contact surfaces is 0.4. The force, necessary to move the block B with constant velocity, will be (g = 10 m/s).

Two blocks A and B of masses 5 kg and 1 kg are connected with the help of massless strings and the system is just at the verge of slipping. The coefficient of static friction between the block A and surface below it is necessary to move the block B.

Static friction is the friction that exists between two surfaces that are not trying to move over each other and which must be overcome before one object starts moving the other.

Two blocks are static equilibrium indicates that the force acting on both blocks is equal.

The frictional force acting on block A is calculated as follows:

Frictional force =  coefficient of static friction * normal reaction

Normal reaction on Block A = 30 * 9.8

The coefficient of static friction between block A and the surface = 0.55

Frictional force = 30 * 9.8 * 0.55

Force on Block B = 161.7

Mass of Block B = 161.7 / 9.8

Mass of Block = 18 kg

Therefore, The coefficient of friction between all contact surfaces is 0.4. The force, necessary to move the block B with constant velocity, will be (g = 10 m/s).

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The name of the substance is silver based on the specific heat capacity value.

The specific heat capacity of the substance is calculated by applying the following formula for heat capacity.

Q = mcΔθ

where;

c = Q / mΔθ

The specific heat capacity of the substance is calculated as;

c = (5875 J ) / ( 500 g x 50 )

c = 0.235 J/kgK

The substance that has the same specific heat capacity calculated above is silver.

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This is an exercise in Rectilinear Uniformly Varied Motion (MRUV) is a type of motion in which an object moves in a straight line and experiences changes in its velocity at a constant rate. In this type of motion, the acceleration of the object remains constant over time.

The distinctive feature of the MRUV is that the velocity of the object changes uniformly, that is, its velocity increases or decreases by a constant amount in each unit of time. If the object experiences a positive acceleration, its velocity increases with time. On the other hand, if the object experiences a negative acceleration, its speed decreases.

In an MRUV, constant acceleration has a direct impact on displacement and the time it takes for the object to reach a certain speed. Also, the direction of the acceleration determines whether the object is accelerating or decelerating relative to its initial motion.

This type of movement is found in various situations of daily life, such as the launch of an object upwards and its subsequent fall, the movement of cars on a road with acceleration or braking, or even the study of bodies in free fall.

Vf = V₀ + a × t

Where:

In this case, the initial velocity (vi) is 1 m/s, the acceleration (a) is -1 m/s^2 (negative because it indicates deceleration), and the time (t) is 4 seconds.

Substituting these values into the formula, we get:

Vf = V₀ + a × t

Vf = 1 m/s + (-1 m/s²) × 4 s

Vf = 1 m/s - 4 m/s

Vf = -3 m/s

1. The time taken to discharge to 2 V is 2×10⁻⁹ s

2. The time taken to discharge to 1 V is 5×10⁻¹⁰ s

The energy stored in a capacitor is given by

E = ½CV²

But

E = Pt

Thus,

Pt = ½CV²

Where

With the formula (Pt = ½CV²), we can determine the time in each case. Detail below:

Data obtained from the question include:

Pt = ½CV²

100 × t = ½ × 1×10⁻⁷ × 2²

Divide both sides by 100

t = (½ × 1×10⁻⁷ × 2²) / 100

t = 2×10⁻⁹ s

Thus, the time required to discharge to 2 V is 2×10⁻⁹ s

Data obtained from the question include:

Pt = ½CV²

100 × t = ½ × 1×10⁻⁷ × 1²

Divide both sides by 100

t = (½ × 1×10⁻⁷ × 1²) / 100

t = 5×10⁻¹⁰ s

Thus, the time required to discharge to 1 V is 5×10⁻¹⁰ s

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The heat lost by water is equal to the heat gained by ice here. The heat lost from water for a temperature change of 25 to 10 degree Celsius is 12300 J.

Calorimetry is an analytical technique used to determine the heat energy absorbed or evolved by a system. The calorimetric equation relating the heat energy q with the mass m, specific heat c and the temperature difference ΔT is :

q = m c ΔT

Here, the heat energy gained by the dry ice is equal to the heat lost from water.

temperature difference for water = 25- 10 °C = 15°C

thus, 15°C is lost from water.

mass of water = 200 g

q =200 g × 4.12 J/°C g × 10°C = 12300 J

Therefore, the heat energy lost from water is 12300 J.

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Answer:

246.38N

Explanation:

Check the complete question in the attached diagram

The normal force acting on the body on an inclined is equal to the weight of the object as shown;

Weight = Normal force = mgcosθ

m is the mass of the box = 29kg

g is the acceleration due to gravity = 9.81m/s²

θ is the angle of inclination = 30°

N = 29 * 9.81 * cos 30°

N = 284.49cos30°

N = 246.38N

Hence the magnitude of the normal force is 246.38N

Answer:

this is the answer the required questions

hope you like this

Answer:

p=I×B

Explanation:

If a current 'I' flows through a given element in your circuit, losing voltage 'V' in the process, then the power 'P' dissipated by that circuit element is the product of that current and voltage.

Answer: Kinetic energy is the energy that an object possesses due to its motion and potential energy is the energy that an object possesses due to its position

Explanation:

Kinetic energy is the energy that a body or item has as a result of its motion.

Example: A ball that starts rolling down a hill has kinetic energy because of its motion.

Potential energy is known as the energy that an object has as a result of its position.

Example: A drawn bow can store energy because of its position.

Answer:

The one that has higher mass

Answer:

The resultant velocity is 86.1 mi/h.    

Explanation:

The law of cosines is given by:

\( c^{2} = a^{2} + b^{2} - 2abcos(\theta) \)

Where:

c: is the resultant velocity =?

a: is the velocity of the plane = 75.0 mi/h

b: is the velocity of the wind = 15.0 mi/h  

θ: is the angle between "a" and "b"                          

The angle between "a" and "b" can be found as follows:

\( \theta = 180.0 - 46.0 = 134.0 ^{\circ} \)

Now, by using the law of cosines we have:

\( c^{2} = (75.0)^{2} + (15.0)^{2} - 2*75.0*15.0*cos(134.0) = 7413.0 \)

\( c = 86.1 mi/h \)    

Therefore, the resultant velocity is 86.1 mi/h.    

The law of sines is:

\( \frac{a}{sin(\gamma)} = \frac{b}{sin(\alpha)} = \frac{c}{sin(\theta)} \)

Where:

γ: is the angle between "b" and "c"

α: is the angle between "a" and "c"

So, if we want to find "c" by using the law of sines, we need to know another angle besides θ (γ or α), and the statement does not give us.

I hope it helps you!        

Answer:

Answer: Magnitude = [____]; unit = [____].

Explanation:

Answer:

7.5 × 10^-11 m

Explanation:

Hope this helps !

If you push a book on a desk with a force of 5 N but the book does not move, it means that the force of static friction between the book and the desk is equal and opposite to your applied force. Therefore, the static frictional force must also be 5 N in magnitude.

Static friction is the force that resists the relative motion between two surfaces in contact that are not moving relative to each other. The maximum value of static friction is determined by the normal force (the force exerted by the surface perpendicular to the book) and the coefficient of static friction between the two surfaces.

The coefficient of static friction depends on the nature of the two surfaces in contact and is a measure of the amount of friction generated between them when they are not moving relative to each other.

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static friction is 5 N.

Static friction is a force that hinders the movement of an object moving along the path. When two fabrics slide over each other, this friction occurs. There's friction all around us. When we walk, for instance, our feet are in touch with the floor.

The static friction between the book and the desk is equal to the force you applied, which is 5 N. This means that the force of static friction is equal and opposite to your pushing force and is preventing the book from moving. Therefore, the static friction is 5 N.

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Explanation:

ANSWER

g

m

=

R

2

GM

1.4=

R

2

(6.667×10

−11

)(7.34×10

22

)

R=

1.4

6.667×10

−11

(7.34×10

22

)

=

34.95×10

11

=1.87×10

6

m

HOPE IT'S HELP AND PLZ FOLLOW ME

Answer:

Carbon Dioxide is a compound and not an element.

Answer:

Carbon dioxide is a compound.

Explanation:

Elements are when you only have one type of atom that makes it up. Carbon dioxide is made up of two different types of atoms.

The efficiency of this machine is 66.67%.

What is efficiency?

Efficiency is a measure of how well a machine or system is able to convert input energy into useful output energy. It is a ratio of the output energy to the input energy, expressed as a percentage.

An efficient machine or system is one that is able to convert a large portion of the input energy into useful output energy, with minimal energy loss. Conversely, an inefficient machine or system is one that loses a significant portion of the input energy as waste heat, sound, or other forms of energy that are not useful to the desired output.

The efficiency of a machine can be calculated using the formula:

Efficiency = (Energy Output / Energy Input) x 100%

In this case, the energy input is 7.55 and the energy output is 5.05, so we can calculate the efficiency as follows:

Efficiency = (5.05 / 7.55) x 100% = 66.67%

Therefore, the efficiency of this machine is 66.67%.

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Answer:

18

Explanation:

12 - 5 + 8 = 15

12 - 8 = 4

7 - 4 = 3

15 + 3 = 18

The relative ability of a bonded atom to attract shared electron pairs is called its electronegativity. This ability increases as the size of the atom decreases because for a smaller atom the shared electrons will be closer to the nucleus.

The electronegativity of an atom is a measure of how strongly it attracts electrons to itself. The higher the electronegativity of an atom, the more it will pull electrons away from other atoms.The electronegativity of an atom increases as the size of the atom decreases. This is because the electrons are closer to the nucleus in a smaller atom, and the nucleus has a greater pull on the electrons.

The electronegativity of an atom also depends on the number of protons in the nucleus. The more protons an atom has, the greater the electronegativity. Electronegativity is an important property in determining the chemical properties of atoms and molecules. Atoms with high electronegativities will tend to form bonds with other atoms that have low electronegativities. This is because the high electronegativity atom will pull the electrons away from the other atom, making the bond between the two atoms stronger.

The electronegativity of an atom is determined by the ability of the atom to attract electrons to itself. The higher the electronegativity of an atom, the more it will pull electrons away from other atoms.The size of an atom plays a role in its electronegativity. Smaller atoms have a higher electronegativity than larger atoms because the electrons are closer to the nucleus. This means that the smaller atom can more easily pull electrons away from the larger atom.

The trend in electronegativity is that it increases as you go from left to right across the periodic table. This is because the atoms get smaller as you go from left to right. The smaller atoms have a higher electronegativity than the larger atoms.The trend in electronegativity is also that it increases as you go from bottom to top of the periodic table. This is because the atoms get closer to the nucleus as you go from bottom to top.

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We need to add 1,634,320 J of heat energy to the water to bring it from 22 °C to 100 °C.

What  is Heat Energy?

Heat energy is the form of energy that is transferred between two objects or systems as a result of a temperature difference between them. It is a form of internal energy that flows spontaneously from hotter to colder matter, and it is measured in joules (J) or calories (cal). Heat energy can be transferred through three main methods: conduction, convection, and radiation.

To calculate the heat energy required to heat up the water in the soup pot, we can use the formula:

Q = mcΔT

where Q is the heat energy, m is the mass of the water, c is the specific heat capacity of water, and ΔT is the change in temperature.

Given:

m = 5000 g

ΔT = (100 °C - 22 °C) = 78 °C

c = 4.184 J/g·°C (specific heat capacity of water)

Q = (5000 g) × (4.184 J/g·°C) × (78 °C)

Q = 1,634,320 J

Therefore, we need to add 1,634,320 J of heat energy to the water to bring it from 22 °C to 100 °C.

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Let, after t minutes car catch up with truck.

So, distance covered by car is, d = 200 + 2t.

Acceleration of car is, a = 2 m/s².

Initial velocity, u = 20 m/s.

Now, by equation of motion :

\(s =ut+\dfrac{at^2}{2}\)

\(200+2t = 20t + \dfrac{2t^2}{2}\\\\t^2+18t -200=0\)

\(t=\dfrac{-18\pm\sqrt{18^2-4(1)(-200)}}{2}\\\\t = \dfrac{-18\pm33.53}{2}\\\\t=7.765\ s\)( eliminating negative solution )

Therefore, time required is 7.765 s.

Many meters will a particle have traveled after t seconds if it is moving in a straight line at a velocity of v(t)=t2e2t meters per second?

In contrast to velocity, which describes the speed and direction of such an object's movement, speed is the rate of movement along a path. Alternatively, velocities is a vector while speed is just a scalar quantity.

Velocity (v), which can be expressed by the expression v = s/t, is still a tensor quantity that determines dislocation (or the shift in position, s), over change in time (t).

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Answer:

no

Explanation:

the equation can't be balanced because it doesn't have the same elements on each side of the equal sign.

The given equation is not a balanced chemical equation because it does not contain the same elements on both sides of the equation.

A chemical equation can be explained as the representation of a chemical reaction in terms of symbols of the substances. A balanced equation containing the same number of atoms of each element on either side of the equation.

The law of mass conservation is followed by every balanced chemical equation. By obeying this law, the total mass on the reactant side should be equal to the total mass on the product side in a balanced equation.

On both sides of the chemical equation, the same elements as well as an equal number of elements are present as the chemical reaction does not alter the identity of the elements. Therefore, the given equation is not a balanced chemical equation.

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The first, third, and fourth complexes pump protons into the intermembrane space as a result of the energetically "downhill" motion of electrons down the chain. Finally, oxygen receives the electrons and combines them with protons to create water.

Electrons must be taken from glucose in order for glycolysis to take place, which is the splitting of a molecule of glucose into two molecules of pyruvate. When glucose is stripped of its electrons, it fragments into two molecules of pyruvate.

The electron transport chain, a collection of proteins in the inner membrane of the mitochondrion, is where the electron carriers deliver the electrons. The electron transport chain is where electrons go from a higher to a lower energy level before being transferred to oxygen (forming water).

During cellular respiration, glucose is deemed fully oxidised when the final products of respiration (ATP energy) are produced at the conclusion of the electron transport chain.

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Current theories can't describe the conditions that existed in the universe during the Planck era because of energy fluctuation.

He is referred to as the father of quantum mechanics and postulated that the energy of light is proportional to the frequency with the constant being referred to as planck's constant.

Current theories can't describe the conditions that existed in the universe during the Planck era because of energy fluctuation which led to the gravitational field to randomly warp space and time.

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