Which of the following is Not true about Mechanical Waves?
A they carry energy
B they transfer matter
C they can be longitudinal
D they require a medium

I believe it is north.

the Answer is D......

Answer:  Step Ladders

In general ladders are with inclined or vertical set of steps or rungs between two upright lengths of metal or wood. Ladders used for climbing up and down.

Step ladders :

It is a self supporting portable ladder, most commonly used in industries.  Self-supporting means it does not need any support to lean.  So this ladder can be used any where in the rooms. For example middle of the room  where support is not available. Also this ladder is non-adjustable flat steps and hinged back.  

(20 N)/(2 m²) = (20/2) N/m² = 10 Pa

_____

The pascal (Pa) is the derived SI unit of pressure equal to 1 N/m².

More than 45 N upward!

A 45-N force must be applied upward to lift an object of equivalent weight, counteracting downward force of gravity. These two forces perfectly balance each other according to Newton's third law.

To lift the 45-N object, the force you apply should be equal in magnitude, but opposite in direction to the force exerted by the object's weight. This implies that the force to lift the object also should be 45-N, but directed upwards. This is in accordance with Newton's third law which states that for every action there is an equal and opposite reaction.

The direction of the force is significant as it determines the object's movement. The force applied to lift the object should be going against the force of gravity, thus, it should be directed upward. Consequently, this opposes the object's weight which is always directed downward due to the pull of gravity.

The strength and direction of a force are vectors in physics, meaning they have both magnitude and direction. In this case, the magnitude is 45-N and the direction is upward to effectively lift the object against the force of gravity (weight).

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To find the acceleration of the skydiver, one needs to subtract the weight of the skydiver from the force of air resistance and divide that net force by the skydiver's mass. This results in an upward acceleration of 7.34 m/s².

In order to find the acceleration of the skydiver, we will apply Newton's Second Law, which states that the net force acting on an object is equal to its mass times its acceleration. This can be represented as F=ma. The net force is the difference between the gravitational force pulling the skydiver down and the air resistance force that acts upwards when she opens the parachute. The weight of the skydiver, which is a force, can be found using the equation F=mg where m is the mass and g is the acceleration due to gravity (approximated as 9.8 m/s²).

In this case, the weight of the skydiver is 70kg × 9.8 m/s² = 686 N. Since the force due to air resistance is greater (1200 N), this means there is a net upward force of 1200N - 686N = 514N. Given net force F=ma, the acceleration a of the skydiver is then F/m = 514N / 70kg = 7.34 m/s² upwards.

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recall and recognition

Compound machines have two or more simple machines

A simple machine that includes two or more simple machines working in unison is known as a compound machine.

A simple machine that consists of two or more simple machines working together is called a compound machine. This can take various forms, as many types of equipment and tools combine simple machines to achieve a specific function, thereby reducing the effort needed to perform a task. Examples of compound machines include bicycles, scissors, and wheelbarrows, all of which harness the principles of leverage, inclined planes, and wheels and axles to operate.

Each component in a compound machine plays a role in transforming or transferring energy from one part to another, simplifying the movement or lifting of loads. For instance, scissors combine levers (the handles) and wedges (the blades) to multiply the force applied by the user to cut through materials.

The answer is A. Coal

My previous comment was deleted for including a link, sorry :0

In the United States, most of our electricity comes from this non-renewable resource is "coal".

The sedimentary rock known as coal becomes combustible and has been formed in rock strata known as coal seams.

Natural resources that cannot be easily replenished by biological methods at a rate quick enough even to keep up with use are considered non-renewable resources.

Therefore, in the United States, most of our electricity comes from this non-renewable resource is "coal".

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I can only help if You have a Image of it

Answer:

Your answer would be Ac

Explanation:

You are infected by the streptococcus bacterium.  You will suffer from a sore throat, as well as occasional rubus of the gastric musosa, unrtil you shake that thing.  Shake it now, baby !

the answer is ( bacteria)

A sore throat is a bacterial infection with a feeling of sore throat and fear. The sore throat is caused by only a small part of the sore throat.

Answer:

Water Table

Explanation:

first there is the soil moisture then there is the unsaturated zone then there is the water table so the answer is water table

Answer:

Water Table

Explanation:

Answer: Genetic information responsible for physical characteristics such as eye color, height, hair color, and skin color can be found in an organism's DNA.

Explanation:

Our genetic information is stored in DNA. DNA (Deoxyribonucleic acid) molecule is a double helix structure which carries information which used in development and growth of body and determines physical characteristics such as eye color, height, hair color and skin color.

The genetic information determining physical traits like eye color and height is found in an organism's DNA, specifically in structures called genes. These genes are inherited from both parents and their expression as observable traits is known as the phenotype. The genotype and environment interact to influence the resulting characteristics of the individual.

The genetic information responsible for physical characteristics, such as eye color, height, hair color, and skin color, can be found in an organism's deoxyribonucleic acid (DNA). The DNA is organized into structures called chromosomes, and specific segments within this DNA known as genes are responsible for various traits. Each gene may exist in different versions referred to as alleles, which determine the variety in these characteristics seen among individuals. In a process called inheritance, genes containing specific alleles are passed from parents to offspring through the reproductive cells, the egg and the sperm.

When the egg and sperm unite, they form a zygote with a complete set of chromosomes, ensuring that the offspring receive genetic material from both parents. This combination of alleles from both parents creates the individual's unique genotype, which is their genetic makeup, and the observable expression of these genes in the individual's traits or characteristics is known as their phenotype.

The interaction between an organism's genotype and the environment in which it develops will influence the presentation of its phenotype. Therefore, characteristics such as height and skin color are affected both by genetic information and environmental factors.

Acceleration = (change in speed) / (time for the change)

Change in speed = (speed at the end) - (speed at the beginning).

Change in speed = (zero) - (50 m/s) = -50 m/s

Time for the change = 4 sec

Acceleration = (-50 m/s) / (4 sec)

Acceleration = -12.5 m/s²

The acceleration of an object which decelerates from an initial velocity of 50 m/s to a stop in 4 seconds is -12.5 m/s².

To calculate the acceleration of an object which comes to a stop from an initial velocity, we can use the following kinematic equation derived from Newton's laws of motion:

v_{f} = v_{i} + a times t

Where v_{f} is the final velocity, v_{i} is the initial velocity, a is the acceleration, and t is the time taken to come to a stop. We're given that the object had an initial velocity of 50 m/s and came to a stop (so v_{f} = 0 m/s) in 4 seconds. Plugging the values into the equation, we get:
0 = 50 + a times 4

To solve for a, we rearrange the equation to isolate a:
a = - (50 / 4)

The negative sign indicates that the acceleration is in the opposite direction of the initial velocity, which makes sense since the object is coming to a stop. Therefore, the acceleration is:
a = -12.5 m/s²

The object's acceleration is -12.5 m/s², which is in the negative direction, indicative of deceleration.

A cup of tea/coffee transfers heat via conduction, convection and radiation.

Conduction:

Convection:

Movement of molecules within the coffee. Hot molecules of the tea at the middle of the drink will be eventually make their way to the outer part of the drink near the tea cup, where they will loose their heat.

Radiation:

Thermal radiation is the loss of heat from a solid object in to atmosphere via the release of electromagnetic radiation. So hot outer edge of the teacup loss the energy to its surroundings via thermal radiation.

Shawn's kinetic energy is calculated using the kinetic energy formula KE =  rac{1}{2}mv^2. With a mass of 45.0 kg and a plausible velocity of 3 m/s, the kinetic energy is 202.5 Joules.

The subject of this question is Physics, as it involves calculating the kinetic energy of a moving object. To find Shawn's kinetic energy as he rides his bike, we use the kinetic energy formula KE =  {1}{2}mv^2, where m is mass and v is velocity.

Firstly, there seems to be an inconsistency in the given information. The velocity mentioned is 70 m/s, but it also states that Shawn rides his bike 1800m in 10.0 minutes. Since 1800 meters in 600 seconds constitutes a velocity of 3 m/s, we will proceed with the more plausible velocity value of 3 m/s.

Therefore, Shawn's kinetic energy can be calculated as follows:

KE =  {1}{2} * 45.6 { kg} * (3 { m/s})^2 = 202.5{ J}

Consequently, Shawn's kinetic energy is 202.5 Joules.

v = initial velocity of launch of the stone = 12 m/s

θ = angle of the velocity from the horizontal = 30

Consider the motion of the stone along the vertical direction taking upward direction as positive and down direction as negative.

v₀ = initial velocity along vertical direction = v Sinθ = 12 Sin30 = 6 m/s

a = acceleration of the stone = - 9.8 m/s²

t = time of travel = 4.8 s

Y = vertical displacement of stone = vertical height of the cliff = ?

using the kinematics equation

Y = v₀ t + (0.5) a t²

inserting the values

Y = 6 (4.8) + (0.5) (- 9.8) (4.8)²

Y = - 84.1 m

hence the height of the cliff comes out to be 84.1 m

The height of the cliff if the stone’s trajectory time from the top of the cliff to bottom to be 4.8s is 84.06m

To get the height of the cliff, we will have to use Newton's second law of motion as shown below;

[tex]S=ut+\frac{1}{2}at^2[/tex]

Since the stone is thrown upwards, a = -g, the formula will become;

[tex]S=ut-\frac{1}{2}gt^2[/tex]

Get the initial vertical velocity "u"

[tex]u = u_0sin \theta\\u=12sin30^0\\u=6.0m/s[/tex]

Given the following parameters

t = 4.8secs

g = 9.8m/s²

Substitute the given parameters into the formula as shown:

[tex]S=6(4.8)-0.5(9.8)(4.8)^2\\S=28.8-112.896\\S = -84.06m[/tex]

This shows that the height of the cliff if the stone’s trajectory time from the top of the cliff to bottom to be 4.8s is 84.06m

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The speed of light Never goes to 0. A is wrong.

The speed of light in refraction does not remain constant. B is incorrect

Light does not repel. That term is reserved for something like magnetism. C is not using the correct vocabulary.

D is the right answer.

Answer:

Ohm

Explanation:

The devices that resists the flow of electric current are called resistors and they offer a resistance to the circuit.

1. Volt is the SI unit of voltage or potential difference

2. Coulomb is the SI unit of electric charge.

3. Ohm is the SI unit of resistance.

4. Watt is the SI unit of electric power.

5. Ampere is SI unit of electric current.

Hence, the unit to measure resistance of the circuit is ohm.

The unit of measure for resistance is (B), ohm (Ω). It is named after German physicist Georg Simon Ohm.

The ohm is defined as the resistance between two points in a conductor when a constant potential difference of one volt applied to these points produces a current of one ampere.

The following equation can be used to calculate resistance:

R = V/I

Where:

R = resistance in ohms

V = voltage in volts

I = current in amperes

For example, if a conductor has a resistance of 1 ohm and a voltage of 1 volt is applied to it, then the current through the conductor will be 1 ampere.

The ohm is a unit of the International System of Units (SI). It is one of the seven base units of the SI, and it is used to measure the opposition to the flow of electric current.

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Answer: Brownion motion is the erratic random movement of microscopic particles in a fluid, as a result of continuous bombardment from molecules of the surrounding medium.

Explanation:

Brownian motion is the random movement of particles in a fluid due to their collisions with other atoms or molecules.

Answer:m=the slope of the line

(x1, y1)= a given point on the line (x,y)=any point on the line

Explanation:

m = slope of line

x1 , y1 = it is the given point on the line

x ,y = any point on line

The general form of equation of line is y - y1 = m (x-x1) where  m is slope of line , y1 and x1 is any point on the line

It is an equation of degree one

x and y represent the coordinate of the point on the line represented in the coordinate plane

m = slope of the line

general equation of a line is y = mx + c

where

m = slope of line

x1 , y1 = it is the given point on the line as data points are represented as (x1,y1) , (x2,y2) , (x3,y3) and so on

x ,y = it is any point line where x is any point on the x axis and y is any point on y axis

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Answer:

According to newton's first law of motion, friction is required to make an object slow down.

Explanation:

According to the Newton's first law of motion, for an object to change its velocity (either a change in the magnitude or the direction), there must be a cause to it which is defined as a net external force.

For example, an object which is sliding across a table or floor slows down due to the net force of friction that is acting on that object.

The formula used to find an object's acceleration is: Acceleration (a) = Change in velocity (Δv) / Time taken (Δt)

In this formula, acceleration is measured in meters per second squared (m/s²), the change in velocity is measured in meters per second (m/s), and the time taken is measured in seconds (s). This formula represents the rate at which an object's velocity changes over time, and it quantifies how quickly the object is speeding up or slowing down.

The SI unit for acceleration is meters per second squared (m/s²). This means that for every second that passes, the velocity of the object changes by the value of the acceleration. For example, if an object has an acceleration of 5 m/s², it means its velocity is increasing or decreasing by 5 meters per second every second.

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The answer is D. Fishing

Answer:

D

Explanation:

Answer:

1). Current is measured in amps and is represented by the symbol "Δ" The relationship between current, voltage, and resistance is mathematically defined by Ohm's Law.

2). Current is the flow of electrons through a circuit.

Explanation:

1). Current is measured in amps and is represented by the symbol "Δ" The relationship between current, voltage, and resistance is mathematically defined by Ohm's Law.

As per Ohm's law we know that

[tex]V = I R[/tex]

here we have

V = voltage difference across the resistor

R = resistance of the conductor

2). Current is the flow of electrons through a circuit.

Rate of flow of charge is known as electric current

It is given as

[tex]I = \frac{dq}{dt}[/tex]

[tex]I = e\frac{dN}{dt}[/tex]

Current is the flow of electrons through a circuit. Ohm's Law is mathematically represented by the equation V=I/R When solving for Resistance in a current and both voltage and current are known values, the equation to solve reads I =V*R If the voltage in a circuit is increased, the current will also increase. Correct options are 2 and 3.

1. **Current is measured in amps and is represented by the symbol "Δ". The relationship between current, voltage, and resistance is mathematically defined by Ohm's Law.**

  - Current is indeed measured in amperes (amps) and is represented by the symbol "I," not "Δ." The statement correctly mentions Ohm's Law, which relates current (I), voltage (V), and resistance (R). However, the symbol "Δ" is not used to represent current.

2. **Current is the flow of electrons through a circuit.**

  - This statement is true. Current is the flow of electric charge, typically carried by electrons, through a circuit. Electrons move from the negative terminal to the positive terminal of a voltage source.

3. **Ohm's Law is mathematically represented by the equation V=I/R. When solving for Resistance in a circuit and both voltage and current are known values, the equation to solve reads I = V * R. If the voltage in a circuit is increased, the current will also increase.**

  - Ohm's Law is correctly represented by the equation V=I/R. When solving for resistance (R), the equation is R=V/I. However, the last part of the statement is not necessarily true. According to Ohm's Law, if voltage (V) increases, and resistance (R) remains constant, then the current (I) will also increase. But if resistance increases along with voltage, the current may not necessarily increase.

So, the true statements are:

- Statement 2: Current is the flow of electrons through a circuit.

- Statement 3: Ohm's Law is mathematically represented by the equation V=I/R. When solving for resistance in a circuit, and both voltage and current are known values, the equation to solve reads R=V/I. If the voltage in a circuit is increased, and resistance remains constant, the current will also increase.

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Complete question is:

Choose all of the true statements regarding the relationship between voltage, resistance, and current.

1. Current is measured in amps and is represented by the symbol "Δ" The relationship between current, voltage, and resistance is mathematically defined by Ohm's Law.

2. Current is the flow of electrons through a circuit.

3. Ohm's Law is mathematically represented by the equation V=I/R When solving for Resistance in a current and both voltage and current are known values, the equation to solve reads I =V*R If the voltage in a circuit is increased, the current will also increase.

Answer: D (doubled)

According to ohm's law

                      I = V/R ,

                      V = IR ;   R = constant and V is doubled

  From the equation

                      V is directly proportional to the current, and it is given that R is constant ;

                    2V = 2I. R    since R = constant

                      Hence I is doubled.

The process primarily responsible for noodle motion, especially in this scenario, is convection.

In any fluid undergoing uneven heating or cooling, a circulation pattern develops where warmer portions of the fluid rise and cooler portions sink.

1. Dr. Moussa

2. Dr. Ali Moustafa Mousharaffa

3. Sir Magdi Habeeb Yacoub

4. Azza Faiad