One result of wave refraction is that _____.

wave energy is concentrated on headlands projecting into the water
wave energy is largely dissipated before the waves reach shore
wave energy is concentrated in the recessed areas between headlands
headlands are enlarged by sediment deposited on their seaward side

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:

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.

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.

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

Answer:

A. None currently exist in the universe.

Explanation:

It is true that the black dwarfs will be burn brightly for only few weeks or months, and they are going to be very hot and not so massive, and it is going to appear after a white dwarf, but by now, there is just a theory that scientist use, because there is any observation of them.

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.

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.

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

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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E decreases from top to bottom in a group of elements.

The terms 'solar nebula', 'accretion disk', and 'solar system' relate to the stages of formation and structure of planetary systems, with the solar nebula being the initial gas and dust cloud, the accretion disk the rotating material forming planets, and the solar system the final collection of celestial bodies orbiting a star.

The student's question involves matching items with the best descriptions related to the formation and structure of astronomical systems:

Moreover, the activities suggested in the question focus on investigating various astronomical phenomena such as planetary nebulae and protoplanetary disks, which are critical to understanding star and planet formation.

To match each item to its description, A corresponds to 'a large cloud of gas and dust,' B corresponds to 'gas and dust spins' (accretion process), and C corresponds to 'planets orbit a star' (structure of a solar system).

To match each item to its best description:

The subject matter involves the physical and chemical changes during the solar nebula stage of solar system formation, the process by which terrestrial and giant planets form, and the events in the further evolution of the solar system.

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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The Lewis dot structure for Na+ shows no dots, signifying the loss of its only valence electron and hence its positive charge.

The Lewis dot structure of a sodium atom (Na) includes one dot to represent each of its valence electrons. An uncharged sodium atom has equal numbers of protons and electrons (11). However, essentially when sodium becomes an ion (Na+), it loses a valence electron, and thereby, ends up with one more proton (11) than its electrons (10) - making it a cation with a positive charge. The Lewis dot structure for Na+ would therefore have no dots as sodium (Na) has lost its only valance electron during ionization.

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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.

For Plato the answer is (they are inversely proportional to each other)

Thanks Taylor! Here is proof, I'm on Plato fyi.

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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Answer:

its B

Explanation:

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.

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.