which force requires contact?
A. The force exerted by air as an object moves through it
B. The force produced by interactions between electronically charged objects
C. The forced produced by interactions between magnetic objects
D. The force of attraction between two masses

Answer:

Explanation:

makes life EASIER

causes land and water POLLUTION

The electric field due to this charge distribution can be found by applying Gauss' law. The electric field at any point in space is the net sum of all the electric fields due to the individual charges.

Gauss' law states that the electric flux through any closed surface is equal to the charge enclosed by the surface divided by the permittivity of free space.

To calculate the electric field due to the charge distribution, the first step is to divide the quarter-circle into small segments. Each segment will have a charge q, and will be of width dx. The total charge in the quarter-circle is then given by the integral of q multiplied by dx from 0 to 2πa.

The electric field at any point P in the first quadrant is then given by the integral of q/4πε0 r2 multiplied by dx from 0 to 2πa, where r is the distance from the point P to the center of the quarter-circle. This gives the electric field at P to be:

E = (1/4πε0)∫ 0 to 2πa q/r2 dx

The electric field due to the charge distribution is therefore a function of the distance from the point P to the center of the quarter-circle, and is inversely proportional to the square of this distance.

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Answer:

1. The formula for speed is speed = distance ÷ time. To work out what the units are for speed, you need to know the units for distance and time

2. 36÷4= 9

(formula) Speed = distance ÷ time

3. Meter (M) centimeter (cm) kilometers (km)

4. Seconds , Hour, Minute

5. 65÷13=5 (object A)

125÷ 25= 5 (object B)

their both Equal of the amount of speed, so they are travelling at the same speed

Hope I helped

In the absence of friction, a force applied to a body for a given amount of time, changes the momentum of the body

The average force per unit area exerted on the passenger with no seatbelt 5,400,000 N/m²

The average force per unit area for the passenger with seat belt 18,750 N/m²

The known parameters are;

The velocity of the car, v₀ = 15 m/s

The time it takes the passenger not wearing seat belt to strike the windshield, \(t_{ns}\) = 0.03 s

Area of contact between the head and the windshield, \(A_{ns}\) = 5 × 10⁻⁴ m²

The mass of the head, \(m_{h}\) = 5.4 kg

Time taken for the passenger wearing seat belt to come to rest, \(t_s\) = 0.50 s

The mass of the passenger wearing seatbelt, \(m_s\) = 75 kg

Area of the seat belt in contact with the passenger, \(A_s\) = 0.12 m²

Required:

To find the average force per unit area exerted on the two passengers

Solution:

According to Newton's second law on motion, force is equal to the product of mass and acceleration

\(Acceleration, \overline a = \dfrac{Change \ in \ velocity}{Elapsed \ time} = \dfrac{v - v_0}{t}\)

Therefore, the acceleration, force and average force per unit area of the passenger with no seat belt;

\(Acceleration, \overline a_{ns} = \dfrac{0 - 15 \, m/s}{0.03 \, s} = 500 \, m/s^2\)

\(F_{ns}\) = \(m_{h}\) × \(\overline a_{ns}\)

Which gives;

\(F_{ns}\) = 5.4 kg × 500 m/s² = 2,700 N

Force per unit area = Force/Area

\(P_{ns} = \dfrac{2,700 \, N}{5 \times 10 ^{-4} \ m^2} = 5,400,000 \ N/m^2\)

The average force per unit area exerted on the passenger with no seatbelt, \(P_{ns}\) = 5,400,000 N/m²

\(Acceleration, \overline a_{s} = \dfrac{0 - 15 \, m/s}{0.5 \, s} = 30 \, m/s^2\)

\(F_{s}\) = \(m_{b}\) × \(\overline a_{s}\)

Which gives;

\(F_{s}\) = 75 kg × 30 m/s² = 2,250 N

Force per unit area = Force/Area

The average force per unit area, for the passenger with seat belt is therefore;

\(P_{s} = \dfrac{2,250\, N}{0.12 \ m^2} = 18, 750\ N/m^2\)

The average force per unit area for the passenger with seat belt, \(P_s\) = 18,750 N/m²

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The spring length is shorter when the elevator is moving down at a constant speed compared to when it is at rest.

When the elevator is at rest, the spring and the object are in equilibrium, and the weight of the object is balanced by the spring force.

The spring force F_s can be calculated using Hooke's law:

F_s = -kx

where k is the spring constant, x is the displacement from the equilibrium position, and the negative sign indicates that the force is in the opposite direction of the displacement.

In this case, when the elevator is at rest, the displacement x is 15 cm, or 0.15 m. Therefore, the spring force is:

F_s = -kx = -(830 N/m)(0.15 m) = -124.5 N

Since the elevator is moving at a constant speed, the net force on the object is zero. Therefore, the spring force must still balance the weight of the object.

The weight of the object W is given by:

W = mg

where m is the mass of the object and g is the acceleration due to gravity (9.81 m/s^2).

In this case, the mass of the object is 5.0 kg, so:

W = (5.0 kg)(9.81 m/s^2) = 49.05 N

Since the net force on the object is zero, the spring force must also be 49.05 N. Using Hooke's law again, we can find the displacement x of the spring when the elevator is moving at a constant speed:

F_s = -kx

49.05 N = -(830 N/m)x

x = -(49.05 N) / (830 N/m) = -0.059 m

The negative sign indicates that the spring is compressed by this amount compared to its equilibrium position. Therefore, the spring length with the object is 0.15 m - 0.059 m = 0.091 m, or 9.1 cm, when the elevator is moving at a constant speed.

So, the spring length is shorter when the elevator is moving down at a constant speed compared to when it is at rest.

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Answer:

Explanation:

It will be B.

The correct answer is the same mass and less weight.

The weight decreases. Your weight will be 1/6 of the weight on the moon that you had on Earth. This is because the mass of the moon is less hence the gravitational pull is very low compared to Earth.

Therefore, the mass of an object on the Moon remains the same as its mass on Earth. But its weight gets less because the gravity on the moon is less than on the Earth.

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The best way to calculate the volume of a log with a serious defect is to calculate the volume of the defect and subtract it from the total volume of the log which is denoted as option C.

This is referred to as the amount of space occupied by any three-dimensional solid which could be a square, rectangle etc.

In a scenario where a defect is present in the log, then it is  best to consider it by first calculating the volume of the defect after which it is then subtracted from the total volume of the log in other to give an accurate result.

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The short-range order in ceramic and polymeric glasses involves a consistent arrangement of atoms or molecules over small distances, while long-range disorder refers to the lack of a periodic structure across larger distances.

Short-range order in ceramic and polymeric glasses refers to the consistent and predictable arrangement of atoms or molecules within a small local region, typically spanning a few atomic distances. In ceramics, this order is mainly due to strong ionic or covalent bonding between the constituent elements. In polymers, short-range order arises from the regular bonding patterns of the monomer units within the polymer chains.

Long-range disorder in ceramic and polymeric glasses is characterized by the lack of a well-defined, repeating structure extending beyond the short-range order. In other words, there is no periodic arrangement of atoms or molecules over larger distances, which is a key feature of crystalline materials.

Ceramic glasses exhibit long-range disorder due to the random arrangement of their constituent elements, which may be caused by rapid cooling during their formation. Similarly, polymeric glasses have long-range disorder because the polymer chains do not have a regular, crystalline arrangement; instead, they adopt a more random and amorphous structure.

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Answer:False static friction helps us from not sliding it hold us.

Explanation:

By applying the second equation of motion, the speed at which he threw the second stone is equal to 12.10 m/s.

First of all, we would calculate the time taken by the first stone to reach a height of 49 meters by applying the second equation of motion as follows:

S = ut + ½gt²

49 = 0(t) + ½ × 9.8 × t²

49 = 4.9t²

t² = 49/4.9

t = √10

t = 3.16 seconds.

Now, we can determine the speed at which he threw the second stone:

Note: Time = 3.16 - 1 = 2.16 seconds.

S = ut + ½gt²

49 = u(2.16) + ½ × 9.8 × 2.16²

49 = 2.16u + 22.86

2.16u = 49 - 22.86

u = 26.14/2.16

u = 12.10 m/s.

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The approximate bond angle between two equatorial positions for a molecule with a trigonal bipyramidal geometry is 120°.

In a molecule with trigonal bipyramidal geometry, there are five electron pairs around the central atom, and these electron pairs arrange themselves in a specific way to minimize electron repulsion. The two axial positions are located at the top and bottom of the molecule, while the three equatorial positions are located around the central atom's equator.

The bond angle between two axial positions is 180°, while the bond angle between an axial position and an equatorial position is 90°. The bond angle between two equatorial positions is greater than 90° and less than 180°. It is approximately 120°, as the electron pairs repel each other equally in the equatorial plane, resulting in a more stable configuration.

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Answer: velocity is the study of how fast an object changes its place, or is displaced.

Explanation: An example would be how fast a basketball reaches the other side of a gym, the acceleration and speed are measured and calculated to find velocity

Answer:

D

Explanation:

a twist is an event that a reader probably wouldn't have been able to predict

Answer:

Tt can be calculated by copy

The combined force of the two ropes on the swing is : 4.56 ∠ 77° above X -axis

Given data :

Tension in the ropes ( T ) = 2.28 N

Angle made by ropes = 13° vertical

F ( combined force ) = T + T

                                  = 2.28 + 2.28 = 4.56 N

from the question  13° vertical is approximately equal to 77° above the positive X-axis.

Therefore the  combined force of the two ropes on the swing is : 4.56 ∠ 77° above the X-axis of the swing.

Hence can conclude that The combined force of the two ropes on the swing is : 4.56 ∠ 77° above X -axis

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Answer:

Explanation:

The combined force of the two ropes on the swing is : 4.56 ∠ 77° above X -axis

Given data :

Tension in the ropes ( T ) = 2.28 N

Angle made by ropes = 13° vertical

Determine the combined force of the two ropes

F ( combined force ) = T + T

                                 = 2.28 + 2.28 = 4.56 N

from the question  13° vertical is approximately equal to 77° above the positive X-axis.

Therefore the  combined force of the two ropes on the swing is : 4.56 ∠ 77° above the X-axis of the swing.

Hence can conclude that The combined force of the two ropes on the swing is : 4.56 ∠ 77° above X -axis

The momentum of an object is the product of its mass and velocity. If the object is moving with a certain velocity and an external force is applied on it then there is a change in the momentum of the object.

The formula for calculating impulse is FΔt, where F is the force and Δt is the time for which the force acts on the object. The impulse acting on the object is equal to the change in momentum of the object.

The time for which the force acts on the object is Δt = 3.0 s. Therefore, the magnitude of the change in momentum of the object is 54 kg m/s. The impulse acting on the object is also 54 N s.

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Formula for acceleration:

\(a=\dfrac{V^f-V^I}{t}\)

acceleration(measured in m/s^2) = Final velocity(measured in m/s) - Initial velocity(measured in m/s) / time(measured in seconds)

__________________________________________________________

Given:

\(V^I=0m/s\) (rest)

\(V^f=28m/s\)

\(t=20s\)

\(a=?\)

__________________________________________________________

Finding acceleration:

\(a=\dfrac{V^f-V^I}{t}\)

\(a=\dfrac{28-0}{20}\)

__________________________________________________________

Answer:

\(\boxed{a=1.4m/s^2}\)

Answer:

that would be b i think not 100% sure

Explanation:

The ability to recognize and control one's own emotions as well as those of others is referred to as emotional intelligence.

The idea there are seven main emotions, each with a different facial expression, is largely accepted among the scientific world. They are: Surprise, Fear, Disgust, Anger, Happiness, Sadness, Afraid, Disgust, and Disgust.

Angry, fearful, depressed, disgusted, and enjoyable

Being emotionally aware is essential for keeping healthy psychological health. The five principal emotions were numerically simulated below. Different terminology are used to describe the various degrees of strength of feelings in each of these five areas.

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We can use the formula:v = u + atwhere:v = final velocity of the sprinter, which is 2.0 m/su = initial velocity of the sprinte, , the magnitude of the friction force is 300 N.

To determine the magnitude of the friction force, use the formula for force, F=ma, where m is the mass of the sprinter and a is the acceleration of the sprinter. The friction force is equal in magnitude and opposite in direction to the force of the sprinter's foot pushing backward against the ground.

Mass of the sprinter,

m = 60 kgTime the sprinter's foot is on the ground,

t = 0.40 sInitial velocity of the sprinter, u = 0 m/sFinal velocity of the sprinter,

v = 2.0 m/sWe need to calculate the friction force acting on the sprinter.To do this, we first need to calculate the acceleration of the sprinter. We can use the formula:v = u + where:

v = final velocity of the sprinter, which is 2.0 m/s

u = initial velocity of the sprinter, which is 0 m/st = time for which the foot is on the ground, which is 0.40 s

Substituting these values, we get:2.0

= 0 + a(0.40)Simplifying, we get:

2.0 = 0.4a

Dividing both sides by 0.4, we get:

a = 5 m/s² Substituting the values, we get:

F = 60 × 5F = 300 N

Therefore, the magnitude of the friction force is 300 N.

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Answer:

13,720 joules

Explanation:

Epotential = mgh

mass x gravity x height

Ep= 14 x 9.8 x 100

Ep=13,720 joules

The work done on the spelunker by the force lifting them during each stage is,

(a) 718 J

(b) 0 J

(c) -718 J

The kinetic energy is given by, K = (1/2)mv², where m is the mass and v is the velocity. Initially, the spelunker is at rest, so their initial kinetic energy is zero. The final kinetic energy is:

K = (1/2)mv² = (1/2)(73.0 kg)(4.40 m/s)² = 718 J

Therefore, the work done on the spelunker during the acceleration stage is: W = K - 0 = 718 J

The spelunker is lifted at a constant speed, so their kinetic energy remains constant. Therefore, the work done on the spelunker during this stage is zero.

W = 0 J

Finally, the spelunker is decelerated to a stop. The initial kinetic energy is,

K = (1/2)mv² = (1/2)(73.0 kg)(4.40 m/s)² = 718 J

The final kinetic energy is zero. Therefore, the work done on the spelunker during the deceleration stage is:

W = 0 - 718 J = -718 J

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Space telescopes have the advantage of being above the blurring effects of the Earth's atmosphere.

A surrounding is a layer of fuel or layers of gases that envelop a planet and is held in a region through the gravity of the planetary frame. A planet retains its surroundings whilst the gravity is exceptional and the temperature of the surroundings is low. A stellar ecosystem is the outer area of a celeb, which includes the layers above the opaque photosphere; stars of low temperature may have outer atmospheres containing compound molecules.

The atmosphere of Earth consists of nitrogen (78%), oxygen (21%), argon (0.9%), carbon dioxide (0.04%), and trace gases. most organisms use oxygen for breathing; lightning and bacteria perform nitrogen fixation to provide ammonia that is used to make nucleotides and amino acids; flora, algae, and cyanobacteria use carbon dioxide for photosynthesis.

The layered composition of the ecosystem minimizes the damaging results of daylight, ultraviolet radiation, solar wind, and cosmic rays to defend organisms from genetic harm. The modern composition of the atmosphere of the Earth is made from billions of years of biochemical modification of the paleo atmosphere by residing organisms.

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The deflection of the pointer when the power supply is turned on is expected to be towards the positive side. Here's why A galvanometer is an instrument that is used to measure the flow of current in a circuit. It consists of a coil that is placed inside a magnetic field.

When a current passes through the coil, it experiences a force that causes it to move.The direction of the movement of the coil depends on the direction of the current passing through it. If the current is flowing in one direction, the coil will move in one direction. If the current is flowing in the opposite direction, the coil will move in the opposite direction.The deflection of the pointer in a galvanometer depends on the direction of the current flowing through the coil. When the power supply is turned on, a current will start flowing through the coil in the galvanometer. Since the coil is placed inside a magnetic field, it will experience a force that causes it to move.

The direction of the force that the coil experiences is determined by the direction of the current flowing through it and the direction of the magnetic field. Since the magnetic field is fixed, the direction of the force depends on the direction of the current. If the current is flowing in one direction, the force will be in one direction. If the current is flowing in the opposite direction, the force will be in the opposite direction.The deflection of the pointer will be towards the positive side if the current flowing through the coil is in the same direction as the magnetic field. If the current is flowing in the opposite direction, the deflection will be towards the negative side.

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The given statement "the electric field inside the conductor of the coaxial sheath is zero" is true.

Hence, the correct option is true.

What is the electric field inside the conductor of the coaxial sheath? In a coaxial cable, the electric field inside the conductor of the coaxial sheath is zero. The coaxial cable has a core conductor, a dielectric insulator, and a surrounding shield conductor. Coaxial cables are used in a variety of applications, including computer networking, video surveillance systems, and other applications.

Coaxial cables have the capacity to carry high-frequency electrical signals with low loss. In a coaxial cable, the electric field inside the conductor of the coaxial sheath is zero. Because of the shielding effect of the outer conductor or shield, the electric field is effectively confined to the space between the center conductor and the shield conductor.

This makes the coaxial cable an ideal transmission medium for high-frequency signals, as the signal is protected from interference and noise caused by external electrical sources.

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Answer:

R = 240 Ω

Explanation:

The resistance created by the light bulb can be calculated by using Ohm's Law:

\(V = IR\\\\R =\frac{V}{I}\)

where,

R = Resistance created by the light bulb = ?

V = Voltage across the bulb = 120 volts

I = current passing through the light bulb = 0.5 A

Therefore,

\(R = \frac{120\ volts}{0.5\ A}\)

R = 240 Ω

Answer:

Correct option: Mohammed has less kinetic energy than Autumn.

Explanation:

Kinetic Energy

Is the energy an object has due to its motion. If the object has a mass m and travels at a speed v, then the kinetic energy K is:

\(\displaystyle K=\frac{1}{2}mv^2\)

The information about four students includes their mass and velocity as follows:

Autumn has a mass of m1=50 kg and a velocity (magnitude) of v1=4 m/s, thus their kinetic energy is:

\(\displaystyle K_1=\frac{1}{2}50\cdot 4^2\)

\(K_1=400\ J\)

Mohammed has a mass of m2=57 kg and a velocity (magnitude) of v2=3 m/s, thus their kinetic energy is:

\(\displaystyle K_2=\frac{1}{2}57\cdot 3^2\)

\(K_2=256.5\ J\)

Lexy has a mass of m3=53 kg and a velocity (magnitude) of v3=2 m/s, thus their kinetic energy is:

\(\displaystyle K_3=\frac{1}{2}53\cdot 2^2\)

\(K_3=106\ J\)

Chiang has a mass of m4=64 kg and a velocity (magnitude) of v4=5 m/s, thus their kinetic energy is:

\(\displaystyle K_4=\frac{1}{2}64\cdot 5^2\)

\(K_4=800\ J\)

Sorted from lower kinetic energy to higher:

Lexy, Mohammed, Autumn, Chiang. Thus:

Autumn has more kinetic energy than Chiang. False

Mohammed has less kinetic energy than Autumn. True

Lexy has more kinetic energy than Mohammed. False

Chiang has less kinetic energy than Lexy. False

Correct option: Mohammed has less kinetic energy than Autumn.

Answer:

its b

Explanation:

got in right on edge

The symbol for nuclear disarmament is the peace sign or the CND symbol, which stands for Campaign for Nuclear Disarmament.

symbol for nuclear disarmament is a peace sign that can absorb radioactive material.

It is also known as the CND (Campaign for Nuclear Disarmament) symbol, and it was designed in the 1950s by a British graphic artist named Gerald Holtom. Holtom designed the symbol for a march against nuclear weapons, and it has since become a universal symbol of peace and anti-nuclear movements.

The peace sign has several interpretations; some people believe it represents a person with outstretched arms in a position of surrender or mourning, while others believe it represents a combination of the semaphores for the letters "N" and "D," which stand for nuclear disarmament.

SummaryThe peace sign or CND symbol is the symbol for nuclear disarmament. It was designed by British graphic artist Gerald Holtom in the 1950s and has become a universal symbol of peace and anti-nuclear movements. The symbol can absorb radioactive material.

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Answer:

the correct objective is C