What kind of mirrors are typically used for security purposes?
O A. diverging
B. convex
O C. converging
D. concave

Answer:

THE ZEROETH LAW

Explanation:

IM JUST TO SMART FOR THIS SHIIIIIIIII

Answer:

ZEROTH

Explanation:

odyssey

Answer:

11340

Explanation:

Power = Work/time.

P = W/t ................ Equation 1

Make W the subject of the equation,

W = Pt.................. Equation 2

Given: P = 270 Watts, t = 42 seconds

Substitute these values into equation 2

W = 270(42)

W = 11340 J

Hence the work done  is 11340

Answer:11340 J

Explanation:

Answer:

mass=weight/gravitational acceleration

mass=1.059/10=105.9

Angular speed after collision: approximately 0.285 rad/s. Linear momentum not conserved due to external force.

To find the angular speed of the bar just after the collision, we can use the principle of conservation of angular momentum.

Before the collision, the system (bar + ball) has zero angular momentum because both the bar and the ball are stationary relative to the pivot point.

After the collision, the angular momentum of the system is conserved. We can write:

[tex]\(I_1\omega_1 + mvr = I_2\omega_2\)[/tex]

where:

[tex]- \(I_1\) is the moment of inertia of the bar about the pivot point before the collision,[/tex]

[tex]- \(I_2\) is the moment of inertia of the bar about the pivot point after the collision,[/tex]

[tex]- \(\omega_1\) is the initial angular speed of the bar,[/tex]

[tex]- \(\omega_2\) is the final angular speed of the bar,[/tex]

[tex]- \(m\) is the mass of the ball,[/tex]

[tex]- \(v\) is the velocity of the ball, and[/tex]

[tex]- \(r\) is the distance from the pivot point to the point where the ball strikes the bar.[/tex]

Given that the bar is hanging vertically, its moment of inertia about the pivot point is [tex]\(I = \frac{1}{3}ml^2\), where \(m\) is the mass of the bar and \(l\)[/tex] is its length. Substituting the given values:

[tex]\(I_1 = \frac{1}{3}(90\, \text{N})(3\, \text{m})^2 = 270\, \text{kg m}^2\)[/tex]

The moment of inertia of the bar does not change after the collision because no external torque is applied. So [tex]\(I_1 = I_2\).[/tex]

The distance from the pivot point to the point where the ball strikes the bar is [tex]\(r = 1.6\, \text{m}\).[/tex]

Substituting the values into the conservation of angular momentum equation:

[tex]\(270\omega_1 + (4\, \text{kg})(12\, \text{m/s})(1.6\, \text{m}) = 270\omega_2\)[/tex]

Solving for [tex]\(\omega_2\):[/tex]

[tex]\(270\omega_1 + 76.8 = 270\omega_2\)[/tex]

Now, we need to find [tex]\(\omega_1\). Since the bar is initially at rest, \(\omega_1 = 0\).[/tex]

[tex]\(0 + 76.8 = 270\omega_2\)[/tex]

[tex]\(\omega_2 = \frac{76.8}{270} \, \text{rad/s} \approx 0.285\, \text{rad/s}\)[/tex]

So, the angular speed of the bar just after the collision is approximately [tex]\(0.285\, \text{rad/s}\).[/tex]

As for why linear momentum is not conserved, it's because an external force (the impact of the ball) is acting on the system. Linear momentum is only conserved in a system where there are no external forces acting on it. In this case, the collision between the ball and the bar introduces an external force, causing linear momentum not to be conserved.

The angular speed of the bar just after the collision is approximately 3.94 rad/s. Linear momentum is not conserved in this situation due to external forces acting on the system, such as gravity and the pivot support force. Angular momentum is conserved because these external forces don't exert torques around the pivot point.

To solve this problem, we need to consider the conservation of angular momentum. we first evaluate the change in angular momentum of the ball. Then, we find the moment of inertia (I') of the pivot. since the principle of conservation of angular momentum states that the change in angular momentum of the ball is equal to the angular momentum of the bar, we can use this to calculate the angular speed of the bar.

The ball strikes the bar at a point 1.6 m below the ceiling, so the distance from the pivot point is 1.6 m.

The initial angular momentum of the ball: L₁ = m₁ × v₁ × r = 4 kg × 12 m/s × 1.6 m = 76.8 kg·m²/s

The final angular momentum of the ball: L₂ = m₁ × v₂ × r = 4 kg × (-5 m/s) × 1.6 m = -32 kg·m²/s

Net change in angular momentum of the ball: ΔL = L₁ - L₂ = 76.8 kg·m²/s - (-32 kg·m²/s) = 108.8 kg·m²/s

The moment of inertia of the bar about the pivot is: I' = (1/3) × M × L² = (1/3) × (90 N / 9.8 m/s²) × (3 m)² ≅ 27.6 kg·m²

Using conservation of angular momentum:

ΔL = I' × ω' where ω' = angular speed of the bar

⇒ 108.8 kg·m²/s = 27.6 kg·m² × ω'

Therefore, the angular speed of the bar, ω' ≅ 3.94 rad/s

The reason why angular momentum is not conserved is because there are external forces (such as gravity and the pivot support force) acting on the system. These forces exert impulses during the collision, affecting the linear momentum but not the angular momentum.

The final velocity of the car is 46 m/s

The final velocity of the car can be obtained as follow:

v = u + at

v = 0 + (4.6 × 10)

v = 0 + 46

v = 46 m/s

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Answer:

The kinetic energy of the cell phone is 9J

Explanation:

The kinetic energy is the energy possessed by a body by virtue of motion.

The kinetic energy is expressed as

KE= 1/2m(v)²

Given data

Mass of cell phone m= 80g--to kg=80/1000= 0.08kg

Velocity of cell phone v= 15m/s

Substituting our given data we have

KE= 1/2*0.08(15)²

KE= (0.08*225)/2

KE=18/2

KE= 9J

Final answer:

Refraction is the bending of light as it passes from one medium to another, and it is pronounced in a prism, where light is separated into its constituent colors through dispersion. Prisms utilize the law of refraction to create a spectrum of colors, as each color is refracted differently based on its wavelength.

Explanation:

Refraction occurs when light enters a new transparent medium and is bent either towards or away from the line perpendicular to the boundary surface. This bending is due to a change in the speed of light as it moves from one medium to another, such as from air into glass. When light passes through a prism, a triangular piece of glass with refracting surfaces, this effect is seen clearly.

The separation of light into different colors is termed dispersion, and it happens because not all colors are bent by the same amount. The deviation of each beam of light depends on its wavelength and the properties of the refracting material. In a prism, violet light is bent more than red light, resulting in the formation of a rainbow spectrum.

The law of refraction, or Snell's law, explains the change in direction of the light rays when they enter a medium with a different index of refraction. According to Huygens's principle, each point of a wavefront acts as a new source of wavelets, which spread out in the second medium at a slower speed, thus bending the wavefront. Prisms use this principle to not only divert but also break up light into its constituent colors, leading to the beautiful dispersion effect observed.

Answer:

Frequency is the reciprocal of the period. The period is 5 seconds, so the frequency is 1/(5 s) = 0.20 Hz.

Explanation: yes

Answer: The same

Explanation: I just did it on Edg

Answer:

the same

Explanation: got it right on edge

Answer:

Surface material breaks down into smaller pieces

Explanation:

The event that occurs after erosion is that very dense particles settle faster than low-density particles.

The term erosion refers to the washing away of top soil. Erosion may be caused by;

In both cases, land is rendered unfit for agricultural purposes hence every method must be employed to avoid erosion.

The event that occurs after erosion is that very dense particles settle faster than low-density particles.

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Answer:  For Plato students the correct answer is

#2. Frost wedging could cause cracks in the rocks.

#4. Tall, powerful waves could carry the rock into the ocean.

#5. The rock could react to seawater, break down, and be carried away by the sea.

Explanation:  There were so many different answers given by everyone but this is the correct answer if you are on Plato

Beats are a garden plant with thick leaves and a rounded red root.  

The rounded red root of the plant is eaten as a vegetable.

Final answer:

Acceleration is directly proportional to force when mass is constant, according to Newton's second law of motion, which can be represented by the formula F = ma.

Explanation:

According to Newton's second law of motion, when the mass is constant, acceleration is directly proportional to the force applied to a system. In simpler terms, if you apply more force to an object of constant mass, its acceleration will increase. Conversely, if you apply less force, the acceleration decreases. Newton's second law can be expressed with the formula F = ma, where F stands for force, m for mass, and a for acceleration.

This relationship implies that for a given mass, the acceleration is always in the same direction as the force applied. If you push an object forward, it will accelerate forward. When the mass of the system does not change, the equation simplifies the understanding of how force affects the system's motion. The constant mass ensures that any change in force results in a proportional change in acceleration.

Answer: transform fault

Explanation: Transform faults are major tectonic features affecting the lithosphere and constitute strike- slip plate boundaries 

The border of thickness change of Eastern China lithosphere is located west to recent gravity. It lies along the tectonic boundary between the Huaiyu-Tianmu mountains passive . is principally a part of the Eurasian plate, but the margins of the Indian and Philippine Sea plates are involved in the Himalayas and in the Coastal Range of Taiwan, respectively.

Answer:

a) 384, 1153 and  1819.9 Hz, b)     L = 0.44 m

Explanation:

In a one-tube system open at one end and closed at the other =, at the open end you have an antinode (belly) and at the closed end a node, so the fundamental resonance is

  fundamental      λ = 4L

   3rd harmonic    λ = 4L / 3

   5th harmonic    λ = 4L / 5

   general term    λ = 4L / n         n = 1, 3, 5,…

a) the frequencies for which the pipe resonates are

       fundamental      λ = 4 0.22 = 0.88m

with the resonance frequency we can find the speed of sound in the air

       v = λ  f

        v = 0.88 384

        v = 337.9 m / s

this is the speed that we will use in all the rest of the problem

for the 3rd harmonic

        λ  = 4 0.22 / 3 = 0.293 m

        f = 337.9 / 0.293

        f = 1153.3 Hz

for the 5th harmonic

         λ  = 4 0.22 / 5 = 0.176 m

         f = 337.9 / 0.176

         f = 1919.9 Hz

b) In the case of the two open ends there are bellies in both, for which

        fundamental   λ  = 2L

        2 harmonic     λ = 2L / 2 = L

        3 harmonic      λ  = 2L / 3

         General term λ = 2L / n         n = 1, 2, 3,…

  let's find the wavelength for the resonance

        v = λ  f

        λ  = v / f

        λ  = 337.9 / 384

        λ  = 0.8799 m

let's find the tube length for this resonance

        λ = 2L

        L = λ / 2

         L = 0.8799 / 2

         L = 0.44 m

therefore for the same resonance the tube must be twice as long

c) If the air is exchanged for helium we look for the length of the tube to find how long the resonance of 384 Hz is, so if the system is open at one end and closed at the other

      v = (4L) f

      v = 4 L 384

where L is measured

Answer:

Radio waves

Explanation:

Radio waves have the lowest frequency and are the least harmful to humans and animals so they are used in tv remotes, cell phones and anything that transmits data.

Answer:

It's infrared waves

Explanation:

Answer:

Efficiency = 30% = 0.3

Explanation:

The general formula for efficiency of a device is given as:

Efficiency = (Desired Output/ Input) * 100%

Here, in our case, we have a petrol engine as a device. So, we analyze it for the efficiency calculations. Here, we have:

Chemical Potential Energy = 1000 J

Kinetic Energy = 300 J

Heat and Sound Energy = 700 J

Now, we know that the desired output of a car or the purpose of a car is to provide Kinetic energy, while all other forms of energy such as heat and sound energies are produced as waste. And the chemical energy is provided to car as input, in form of fuel. Therefore,

Input = Chemical Potential Energy = 1000 J

Desired Output = Kinetic Energy = 300 J

Therefore,

Efficiency = (300 J/1000 J) * 100%

Efficiency = 30% = 0.3

The efficiency is 30% or 0.3

Since  petrol engine that transforms 1000J of chemical potential energy into 300J of kinetic energy, and 700J into wasted heat and sound energy.

So,

We know that

Efficiency = (Desired Output/ Input) * 100%

Here

Input = Chemical Potential Energy = 1000 J

Desired Output = Kinetic Energy = 300 J

So,

Efficiency = (300 J/1000 J) * 100%

= 30%

= 0.3

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Answer:

06.04 Mitosis and Meiosis

Instructions: In the Mitosis and Meiosis lab, you investigated sexual and asexual reproduction as well as the processes of cellular division by mitosis and meiosis. Record your observations in the lab report below. You will submit your completed report.

________________________________________

Name and Title:

Mitosis and Meiosis Lab Report.

Objective(s):

To learn and explore what mitosis and meiosis is and what they do.

Hypothesis:

Record your predictions during the zoo tour section of the lab in the data chart.

Procedure:

First, go into the mitosis and meiosis cycles. Then look at what happens when a sex cell from a female tiger is combined with a sex cell from a male tiger. Then investigate what happens when two starfish reproduce asexually. Then write down the predictions about how each organism will replicate. Then, keep track on whether or not the forecast was right.

Data:

Record your data from the zoo tour in the data chart below. Be sure to fill in the chart completely.

Zoo Organism Reproduction Prediction

(sexual, asexual, or both) Reproduction Result

(sexual, asexual, or both)

Elephant - Sexual, Sexual

Whiptail lizard - Asexual, Asexual

Parrot - Sexual, Sexual

Redwood tree - Both, Both

Amoeba - Asexual, Asexual

Jellyfish - Asexual, Both

Conclusion:

Your conclusion will include a summary of your lab results and an interpretation of the results. Please write in complete sentences.

1. List one-way mitosis and meiosis are the same and one way they are different.

Meiosis has 2 cell divisions, but mitosis has just one cell division. Since the parent cell develops diploid cells, meiosis I is the same as mitosis. The distinction between meiosis and mitosis is that after the whole process, meiosis produces genetically distinct haploid daughter cells, while mitosis produces genetically identical diploid daughter cells.

2. What is one advantage and one disadvantage of sexual reproduction?

The greatest benefit of sexual reproduction is that it aids in the development of offspring that are well suited to environmental environments due to genetic differentiation. As a result, the nation has a diverse range of descendants. The downside is that it needs two parents and takes longer than asexual reproduction.

3. What is one advantage and one disadvantage of asexual reproduction?

Asexual reproduction has the advantage of requiring only one parent, taking a short amount of time, and producing genetically identical offspring. The only drawback is that when there is a catastrophe, the mortality rate is poor due to the generation of genetically identical offspring.

4. Some living organisms are capable of both asexual and sexual reproduction. Explain how this can be an advantage.

To produce offspring, the organism may use either sexual or asexual reproduction. If it is difficult to find a mate, the living being will use asexual reproduction to produce offspring quickly. Sexual reproduction is possible because the individual requires genetically distinct offspring for survival.

In unicellular organisms, cell reproduction give rise to next generation and in multicellular organisms, cell division occurs. Mitosis and Meiosis are the two different forms of nuclear division. Cell division is a highly regulated process.

A type of cell division which results in the formation of four daughter cells each one with half the number of chromosomes as the parent cell is called the meiosis. In mitosis there occurs the formation of two daughter cells with the same number and kind of chromosomes as the parent cell.

In animals, meiosis only occurs in the cells that give rise to the sex cells (gametes), i.e, the egg and the sperm. In meiosis chromosomes not yet visible but DNA has been duplicated or replicated.

The term mitosis is used to describe the duplication and distribution of chromosomes, the structures that carry the genetic information. It is essential to life because it provides new cells for growth.

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Answer:

i) R = R₀/ 5 , ii) Req = R₀ / 25, iii)    R_series / R_parallel = 25

Explanation:

i) The resistivity of a metal is constant, therefore resistance is

             R = ρ L / A

where we can see that cutting the resistance in 5 parts each part has

R = R₀/ 5

where R ose the original resistance.

ii) The equivalent resinification of a parallel resistance is

                   1 / Req = ∑ 1 / Ri

                    1 / Req = 5  1/ (R₀ / 5)

                    1 / Req = 25 / R₀

                    Req = R₀ / 25

to buy these values ​​we find their relationship

            R₀ / [tex]R_{paralel}[/tex] = 25

iii) the series resistance is

              Req = 5 Ri

               q = 5 (Ro / 5)

              Req = Ro

the relationship between resistance in being and parallel is

               R_serie / R_parallel = R₀ / (R₀ / 25)

               R_series / R_parallel = 25

Answer:

According to the right-hand rule, the magnetic field is into the page.

Explanation:

According to the right-hand rule, the magnetic field is into the page. According to this rule, if the middle finger points in the direction of initial motion of the charge as it enters the magnetic field to the right, and point the thumb and index finer perpendicular to each other and the middle finer perpendicular to the index finer. We then point the middle finger to the right in the direction of motion of the proton. If we are to have a clockwise force on the proton in the plane of the page, the thumb must point parallel to the page, downwards towards the south. The direction of the index finger is thus the direction of the magnetic field, and this is into the page.

Answer:

Scientists are looking for a way to create cheap, safe, and sustainable energy.

Nuclear fusion is the process by which two atoms rapidly collide at each other forming a new nucleus. The energy of colliding and synthesizing has intrigued scientist into believing that this could be one of best sources of renewable energy.Explanation:

Answer:

d

Explanation:

e2020

Answer:

5m/s

Explanation:

From momentum conservation:

Momentum =mass × veloclty

Momentum before collision = momentum after collision

Given that mass of dart = 0.5kg, mass of apple = 1kg, velocity of dart = 1.5m/s, velocity of apple = 0m/s

(0.5×1.5)- (1×0) = ( 0.5+1)v

7.5-0 = 1.5v

7.5 = 1.5v

V = 7.5/1.5

V = 5m/s.

velocity of the dart and apple just after the dart is embedded is 5m/s

The problem is solved using the principle of conservation of momentum. The total momentum before the collision is equal to total momentum after, which allows us to calculate the velocity of apple and dart together after the collision as 5 m/s.

This problem involves the concept of conservation of linear momentum. In an isolated system where no external forces are acting (like this dart and apple situation), the total linear momentum before the collision is equal to the total linear momentum after the collision.

We are given that the dart (0.5kg) was moving at 15 m/s and the apple (1kg) was at rest, the initial total momentum before the collision would be the momentum of dart (since apple was at rest) = mass of dart x velocity of dart = (0.5kg)(15m/s)=7.5kg.m/s.

After the collision, both the dart and the apple move together with a new velocity v. The final total momentum is the sum of the momentum of apple and dart = total mass x velocity = (1kg + 0.5kg) x v .

Thus, our equation based on the principle of momentum conservation would be: (mass of dart x initial velocity) = (total mass x final velocity), or 7.5kg.m/s = 1.5 kg * v. Solving for the new velocity (v), we get v = 7.5kg.m/s / 1.5kg =5 m/s.

So, the velocity of the dart and the apple just after the dart is embedded would be 5 m/s.

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Answer:6m/s^2

Explanation:

Mass =3kg

Force=18N

Acceleration =force ➗ mass

Acceleration =18 ➗ 3

Acceleration =6

Acceleration =6m/s^2

Final answer:

The acceleration of a 3 kg rock thrown with a force of 18 N is 6 m/s², calculated using the formula a = F/m.

Explanation:

The acceleration of a 3 kg rock that is thrown with a force of 18 N can be calculated using Newton's second law of motion, which states that the force acting on an object is equal to the mass of the object multiplied by its acceleration (F = ma).

Therefore, to find the acceleration (a), we can rearrange this formula to a = F/m.

Applying this to the problem at hand, if the force (F) is 18 N and the mass (m) of the rock is 3 kg, the acceleration (a) would be:

a = F/m = 18 N / 3 kg

= 6 m/s²

Answer:

If the charged particles are moving, electrical energy is a type of kinetic energy

Explanation:

This is because the electrical energy converted to kinetic energy of the charges. If q is the magnitude of the charge and V the electric potential it passes through, if it has a mass, m, it will develop a speed, v due to kinetic energy given by

qV = 1/2mv²

v = √(2qV/m)

The voltage in a circuit can be determined from the current, total resistance, and capacitance. The correct option is D.

The current is the stream of charges flowing from the positive terminal of the voltage source to the its negative terminal.

A simple circuit consists of a voltage source or battery and resistance, current will flow when connected. But, if circuit has capacitance and resistance, the current will flow from the circuit.

Thus, the voltage in a circuit can be determined from the current, total resistance, and capacitance. The correct option is D.

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The potential difference across the 45 Ω resistor is 4.5 V.

The potential difference across the 45 Ω resistor can be calculated using Ohm's Law, which states that V = I * R, where V is the potential difference, I is the current, and R is the resistance. In this case, the current is 0.10 A and the resistance is 45 Ω.

Plugging these values into the formula, we get V = 0.10 A * 45 Ω = 4.5 V.

Therefore, the potential difference across the 45 Ω resistor is 4.5 V.

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Answer:it’s different materials have different abilities to transfer energy.

Explanation:

Just took it.

Answer:

its c

Explanation:

i got it right on edu

Final answer:

An open switch causes an open circuit and prevents current flow, not a short circuit. A short circuit occurs when a low-resistance pathway inadvertently connects the two sides of a voltage source, causing excessive current flow.

Explanation:

An open switch in an electrical circuit represents a discontinuity where no current can flow, effectively having a value of 0, while a closed switch allows current to pass through, having a value of 1. However, an open switch cannot cause a short circuit because a short circuit occurs when there is a low-resistance pathway connecting the two sides of a voltage source, which bypasses the normal load in a circuit. Instead, an open switch leads to an open circuit, where there is a break or gap preventing electrical flow. A short circuit may happen in a scenario where a piece of wire or another conductor inadvertently connects the two sides of a voltage source, causing a large current to flow and potentially overheating the wire.

In the case of holiday lights mentioned in the question, each bulb has a shunt that allows current to flow around the bulb, creating a temporary short circuit when the bulb burns out. This mechanism ensures the rest of the lights stay on. However, if too many bulbs burn out, the shunts themselves can fail (open), causing a section of the string to go dark because the circuit has been interrupted.

Answer:

This causes higher average tidal ranges. The gravitational pull of the Sun and moon on Earth combined cause high tides that will be higher and low tides that will be lower than average.