Which best contrasts the weak force and the electromagnetic force??

Answer:

It tends to increase across a period.

Explanation:

Electronegativity is the tendency of an atom in a bond pair to attract the shared pair of electron towards itself.

Low ionization energies as well as low electron affinities mean the atom has low effective nuclear charge, which results in the less attraction of the valence electrons by the atom and thus, low electronegativity.

Thus, across the period, electronegativity increases and down the group, it decreases.

Answer:

D) INSULATORS

Explanation:

electrical chord are the medium to travel electric current

so here it is always covered so that it is not dangerous to surrounding.

So in order to cover it we know that we need a material which will not allow that current to pass through the body of the person who is holding the wire

so such material which do not allow the electric current to pass through them is known as insulators

so here correct answer would be

D) INSULATORS

Answer:

b)  line spectra

Explanation:

 The model of the atom as given by Rutherford was modified by Bohr. According to Rutherford's model, the electrons that orbit the nucleus electromagnetic radiation. As a result they lose energy and had to collapse into the nucleus, thereby making the atom unstable.

Bohr corrected that by proving that electrons revolve around the nucleus only in certain fixed orbits, with a specific energy. They can jump from one to another and lose or gain energy by emitting or absorbing energy in that process.

Electron cloud is the region where the electrons are most likely to occur. This was proposed by Schrodinger.

A light-year, being the distance light travels in a year, is about 9.461 x 10^15 meters. 1.00 light-years equals 63,240 astronomical units (AU). And the speed of light is around 7.214 AU/hr.

In astronomy, a light-year and an astronomical unit (AU) are common units of measurement.

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One light-year equals approximately 9.461 x 10^15 meters. There are about 63,000 AUs in one light-year. The speed of light is roughly 7.2 AU/h.

A light-year is the distance light travels in one year. To find out how many meters there are in 1.00 light-year:

To calculate how many Astronomical Units (AU) are there in 1.00 light-year:

To find the speed of light in AU/h:

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Answer:

Explanation:

Periodic table of element is organized on the basis of number of protons present in the nucleus of element. Nucleus contain both proton and neutron, whereas, electrons are present in the energy level i.e. outside nucleus so, it is the number of proton which determine the atomic number of an element thereby, it's position on the periodic table.

For example, carbon have six proton and oxygen have eight proton that is why carbon is placed ahead of oxygen in the periodic table.

The projectile will take about 9 s to reach the highest point in its path.

[tex]\texttt{ }[/tex]

Acceleration is rate of change of velocity.

[tex]\boxed {a = \frac{v - u}{t} }[/tex]

[tex]\boxed {d = \frac{v + u}{2}~t }[/tex]

where:

a = acceleration ( m/s² )

v = final velocity ( m/s )

u = initial velocity ( m/s )

t = time taken ( s )

d = distance ( m )

[tex]\texttt{ }[/tex]

Let's recall Range of Projectile formula as follows:

[tex]\boxed{ R = \frac{ v_o^2 \sin 2\theta}{g} }[/tex]

where:

R = range of projectile ( m )

v₀ = initial speed of projectile ( m/s )

θ = angle of projection

g = gravitational acceleration ( m/s² )

Let us now tackle the problem!

[tex]\texttt{ }[/tex]

Given:

initial vertical component of speed of projectile = u_y = 90 m/s

initial horizontal component of speed of projectile = u_x = 49 m/s

gravitational acceleration = g = 9.80 m/s²

Asked:

time taken to reach the highest point = t = ?

Solution:

As we know that the final vertical component of speed of projectile at the highest point is 0 m/s , therefore:

[tex]v_y = u_y - gt[/tex]

[tex]0 = 90 - 9.8t[/tex]

[tex]90 = 9.8t[/tex]

[tex]t = 90 \div 9.8[/tex]

[tex]t \approx 9 \texttt{ s}[/tex]

[tex]\texttt{ }[/tex]

[tex]\texttt{ }[/tex]

Grade: High School

Subject: Physics

Chapter: Kinematics

The correct answer to the question is : Mass i.e mass is the property that determines the formation of black hole,neutron star or white dwarf after the end of a star.

EXPLANATION:

Before going to answer this question, first we have to understand Chandrasekhar limit.

It is the Chandrasekhar limit which gives an idea about the formation of white dwarf, neutron star, or black hole at the last stage of a dying star.

The Chandrasekhar limit is equal to 1.4 solar masses.

As per Chandrasekhar limit, if the mass of the dying star is less than 1.4 solar mass, then it will become a white dwarf.

If the mass of the dying star is greater than 1.4 solar mass, then a neutron star or black hole is formed.

Hence, the correct answer of this question is mass.

Viscosity refers to a liquid's resistance to flow. Among the options provided, corn syrup has the highest viscosity as it flows slower compared to milk, water, and orange juice.

The question asks which of the following substances has the highest viscosity: corn syrup, milk, water, or orange juice. Viscosity refers to a liquid's resistance to flow, with substances that flow slowly having high viscosity and those that flow quickly having low viscosity. Based on this, the substance with the highest viscosity in the options is corn syrup.

For a better understanding, let's compare this with the provided examples like honey and motor oil, which have high viscosities because they flow slowly. The situation is similar with corn syrup. On the contrary, liquids like orange juice, milk, and water flow relatively quickly and freely, indicating lower levels of viscosity compared to that of corn syrup.

Therefore, among milk, water, orange juice, and corn syrup, corn syrup has the highest viscosity.

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travel through solids

P waves and S waves are alike in that they both travel through solids.

P waves and S waves are alike in that they both travel through solids.

The correct option is option (2).

P waves and S waves are both seismic waves generated during earthquakes. They both travel through solids, such as the Earth's interior.

However, P waves are longitudinal waves that compress and expand particles parallel to the wave's direction, while S waves are transverse waves that displace particles perpendicular to the wave's direction.

P waves generally travel faster than S waves and arrive at seismic stations before S waves. These waves provide valuable information about the nature of earthquakes and the Earth's interior.

Therefore, P waves and S waves are alike in that they both travel through solids. The correct option is option (2).

To know more about the waves:

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The distance traveled by an object under the influence of gravity is 4.9t².

The distance traveled by an object under the influence of gravity is determined using second equation of motion as follows;

x(t) = v₀t + ¹/₂gt²

x(t) = 0 + ¹/₂gt²

x(t) = 4.9t²

Graph of the distance between t= 0 and t = 5 s

The graph of the motion of the object is presented in the image uploaded.

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The distance fallen by an object under the influence of gravity increases with the square of time. At t=0, the distance fallen is 0. Using the equation d = 0.5 * g * t^2, where g is the acceleration due to gravity, we can calculate the distance fallen at different time intervals.

The distance fallen by an object under the influence of gravity can be represented by a quadratic equation. At time t=0, the object starts from rest and its distance fallen is zero. As time increases, the object's distance fallen increases with the square of time.

Let's draw the distance fallen, as a function of time, from t=0 to t=5.00. At t=0, the distance fallen is 0. As time increases, the distance fallen can be calculated using the equation d = 0.5 * g * t^2, where g is the acceleration due to gravity (9.8 m/s^2).

Here is a table representing the distance fallen at different time intervals:

t = 0 s, d = 0 m
t = 1 s, d = 4.9 m
t = 2 s, d = 19.6 m
t = 3 s, d = 44.1 m
t = 4 s, d = 78.4 m
t = 5 s, d = 122.5 m

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1. The resultant force is equivalent to the hypotenuse of the triangle formed by the component forces, and the angle between the result and each component is found with trig based on that premise. You're looking for the angle formed by the hypotenuse and the longer of the two sides, so the larger component is used as the adjacent side and the smaller as the opposite side. So the angle is given by the inverse tangent of 7/14, or equivalently of 1/2.

Answer:

1.  26.6°

2. 21.2 mph each

Explanation:

1. When two forces are acting perpendicular to each other, then their resultant is given by:

R = √(F²+F'²+ 2 F F' cosθ) =√(7²+14²+ 2×7×14 cos 90°) = 15.65.

Angle between two vectors can be found using law of sines:

[tex]\frac{sin A}{a}=\frac{sin B}{b}=\frac{sin C}{c}[/tex]

We have to find the angle (Ф) opposite side 7 lb force i.e. angle between Resultant and 14 lb force.

[tex]\frac{sin 90}{15.65}=\frac{sin \phi}{7} \Rightarrow \phi = sin^{-1} \frac{7}{15.65} = 26.6^o [/tex]

2.

Let the components of velocity be v and v'

Because each component makes an angle 45° with the resultant, it can be found as:

v = 30 cos 45° = 21.2 mph

v' = 30 cos 45° = 21.2 mph

Both the components would be equal in magnitude.

D. The net gravitational force on the astronaut is not balanced by a normal force

When an astronaut in orbit experiences apparent weightlessness, the net gravitational force on the astronaut is not balanced by a normal force.

When an astronaut in orbit experiences apparent weightlessness, the correct option is d. the net gravitational force on the astronaut is not balanced by a normal force. In orbit, the astronaut is still under the influence of gravity, but they are constantly falling towards the Earth due to their orbital velocity. This creates the sensation of weightlessness as the astronaut and their spacecraft are in freefall around the Earth.

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Answer: C.

The gravity on the Moon is less than the gravity on Earth.

Explanation: plato :3

Final answer:

To find the magnitude and direction of the fourth displacement, we can use vector components. We need to add up the north and east components of the three given displacements, and then find the fourth displacement that brings the sum back to the starting point.

Explanation:

To find the magnitude and direction of the fourth displacement, we can use vector components. We need to add up the north and east components of the three given displacements, and then find the fourth displacement that brings the sum back to the starting point. Let's break down the given displacements:

First, let's convert the given angles to north and east components:

Now we can add up the north and east components:

North component: 0 + (-210sin(45°)) + 270sin(30°)

East component: -190 + (-210cos(45°)) + (-270cos(30°))

Finally, we can use these components to find the magnitude and direction of the fourth displacement using the Pythagorean theorem and trigonometry.

Final answer:

The magnitude and direction of the fourth displacement, use vector components to represent each displacement as a vector and add them together. Then subtract the vector sum from the starting point to find the magnitude and direction of the fourth displacement.

Explanation:

To find the magnitude and direction of the fourth displacement in the given scenario, we can use vector components. We start by representing each displacement as a vector with its magnitude and direction. The first displacement is 190 m straight west, which can be represented as (-190, 0) in vector form. The second displacement is 210 m in a direction 45.0° east of south, which can be represented as (210*cos(45°), -210*sin(45°)). The third displacement is 270 m at 30.0° east of north, which can be represented as (270*cos(30°), 270*sin(30°)). Adding these vectors together will give us the vector sum of the first three displacements. To find the fourth displacement, we need to subtract this vector sum from the starting point, which will give us the magnitude and direction of the fourth displacement.

Answer: The best and most correct answer among the choices provided by your question is the first choice.

The altitude of a triangle is the height of the triangle and the median of a triangle intersects each side.

I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!

Explanation:

Positive acceleration occurs when an object speeds up.

Explanation:

Acceleration is the rate of change in velocity per unit time:

[tex]a=\frac{\Delta v}{\Delta t}[/tex]

where [tex]\Delta v[/tex] is the change in velocity while [tex]\Delta t[/tex] is the time interval. From the formula, we can understand that when [tex]\Delta v[/tex] is positive, so when the object is speeding up, the acceleration is positive; on the contrary, when [tex]\Delta v[/tex] is negative (so, when the object is slowing down), the acceleration is negative.

Positive acceleration occurs when there's an increase in an object's velocity over time, like when a car speeds up after pressing the gas pedal.

Positive acceleration occurs when an object speeds up. This concept is central to the understanding of motion in physics. Acceleration is defined as the rate of change of velocity per unit of time. When the velocity of an object increases, it means the object is speeding up, hence, undergoing positive acceleration. For instance, when you press the gas pedal in a car, you increase the car's velocity; that's an example of positive acceleration in the real world.

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Answer:

True

Explanation:

Gravity is a force that helps to hold the universe together. The statement is true. The gravitational force is always attractive in nature. It depends on the masses and the distance between them. Mathematically, it is given by :

[tex]F=G\dfrac{m_1m_2}{d^2}[/tex]

Where

G = universal gravitational constant

m₁ and m₂ are masses

d is the distance between them

Gravity is responsible to hold the planets in an orbit around the sun. Ocean tides are also caused due to gravitational pull of the moon. If gravity is not present in the universe then there would be no moon, no stars etc.

Hence, the given statement is true.

Answer:

If a substance absorbs energy but its temperature does not change, then the internal POTENTIAL energy is changing.

Explanation:

As we know that the internal energy of the molecules in terms of their kinetic energy is directly related to the temperature of the gas

Here we know that

[tex]KE = \frac{3}{2}nRT[/tex]

so if the energy is transferred in the form of kinetic energy of the molecules then it will increase the temperature of the gas

so here it says that the substance absorbs the energy but its temperature does not change then it means the kinetic energy of the gas will remain constant

So this energy will convert into its potential energy

so correct answer will be

If a substance absorbs energy but its temperature does not change, then the internal POTENTIAL energy is changing.

Answer:

A. 0.0 joules

Explanation:

We can calculate the initial kinetic energy of the car, which is given by:

[tex]K=\frac{1}{2}mv^2 = \frac{1}{2}(1,324 kg)(20 m/s)^2=2.65\cdot 10^5 J[/tex]

where m is the mass of the car and v its initial speed. After the collision, the car stops, so its final speed is zero. Therefore, the new kinetic energy of the car will be

[tex]K=\frac{1}{2}(1,324 kg)(0 m/s)^2 = 0 J[/tex]

This type of collision is called 'perfectly inelastic collision', and it occurs when there is the maximum loss of kinetic energy, as in this case. Therefore, the correct answer is

A. 0.0 joules

The kinetic energy of a car that crashes into a wall and stops is 0.0 joules since the car's velocity becomes zero after the perfectly inelastic collision.

When a car traveling at a certain speed crashes into a wall and stops, it undergoes a perfectly inelastic collision as it collides with the wall and comes to rest. The initial kinetic energy of the car can be calculated using the formula KE = ½ mv², where m is the mass of the car and v is the velocity of the car. However, after a perfectly inelastic collision with the wall, where the car comes to a complete stop, the kinetic energy is 0.0 joules because the velocity of the car is zero, and thus kinetic energy after the collision is also zero.