You walk 20 m north, then 5 meters south . What is your displacement?

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.

Answer:   Q= Air resistance

Description:

The box release two forces acts on it, when it is falling from the building.

1. Its weight,  2. Air resistance

The answer is Air resistance

I can only help if You have a Image of it

Answer:

Your answer would be Ac

Explanation:

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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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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To increase the speed of the go-cart, 250 J of work and energy must be done on it.

To find the work done on the go-cart, we can use the work-energy theorem. The work done is equal to the change in kinetic energy of the go-cart.

The initial kinetic energy of the go-cart is given by K_i = (1/2)mv^2, where m is the mass of the go-cart and v is its initial velocity. Plugging in the values, we have K_i = (1/2)(20 kg)(5 m/s)^2 = 250 J.

The final kinetic energy of the go-cart is given by K_f = (1/2)mv^2, where m is the mass of the go-cart and v is its final velocity. Plugging in the values, we have K_f = (1/2)(20 kg)(10 m/s)^2 = 500 J.

The change in kinetic energy is ΔK = K_f - K_i = 500 J - 250 J = 250 J.

Therefore, 250 J of work must be done on the go-cart to increase its speed from 5 m/s to 10 m/s.

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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.

black white green and gold

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.

the Answer is D......

1. Dr. Moussa

2. Dr. Ali Moustafa Mousharaffa

3. Sir Magdi Habeeb Yacoub

4. Azza Faiad

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: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:

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: 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 answer is D. Fishing

Answer:

D

Explanation:

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.

I believe it is north.

Let after time "t" the Position of A and B are in such a way that A is heading to B and its velocity makes some angle with x axis

So the relative speed of A with respect to B in horizontal direction is given as

[tex]\frac{dx}{dt} = u - vcos\theta[/tex]

relative motion in y direction is given as

[tex]\frac{dy}{dt} = 0 - vsin\theta[/tex]

from first equation we can say

[tex]\int dx = \int u dt - \int vcos\theta dt[/tex]

[tex]0 = uT - v\int cos\theta dt[/tex]

[tex]\int cos\theta dt = \frac{uT}{v}[/tex]

now in the direction of approach of each other

[tex]\frac{dr}{dt} = ucos\theta - v[/tex]

[tex]\int dr = \int ucos\theta dt - \int vdt[/tex]

[tex]0 - d = u\int cos\theta dt - vT[/tex]

[tex]- d = u(\frac{uT}{v}) - vT[/tex]

[tex]T = \frac{vd}{v^2 - u^2}[/tex]

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.  

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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(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.

Answer:

False

Explanation:

The collaborative learning is not a type of learning that focuses on individual learning. This type of learning focuses on joint learning between two or more individuals that act as a team. The collaborative learning is a method that encourages the two or more individuals to work together, to capitalize on each other's skills and resources for the benefit of the whole, for the team. This type of learning has its own supporters and critics, as some consider it as excellent way to develop the team work and closer bonds between the people, while others argue that it is destroying the potential of the individual.

Collaborative learning does not focus on the learning of an individual, it emphasizes working together in groups to achieve a common goal.

The statement 'Collaborative learning focuses on the learning of an individual' is False. Collaborative learning involves students working together in groups or teams to achieve a common goal or complete a task. It emphasizes cooperative and active participation, where students learn from each other's perspectives, experiences, and knowledge. It encourages communication, critical thinking, problem-solving, and teamwork skills. Examples of collaborative learning activities include group discussions, projects, presentations, and peer teaching.

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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.

Since the lamps are identical, the current divides equally through them... 0.6A through each lamp.

You don't have to worry about voltage drop or the value of the resistor to make that 9 volt drop to happen. The current is divided evenly by the two lamps. If the ammeter reads 1.2 amps before the current goes into the lamps then since this is a parallel circuit, the lamps will divide up the current evenly between them.

That's another way of saying each one will get 1.2 amps /2 = 0.6 amps.

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.

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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