true or false: the law of reflection can be used to show how an image appears behind a mirror and it can also be used to determine where the image will be located.

Answer:

59F

Explanation:

Given parameters:

Temperature in °C  = 15°C

Unknown:

Temperature in Fahrenheit scale  = ?

Solution:

To solve this, we use the conversion equation below;

       F  = (C x 1.8)  + 32

C is the temperature in celcius;

    F = (15 x 1.8) + 32  = 59F

Answer:

The dynamo has a wheel that touches the back tyre. As the bicycle moves, the wheel turns a magnet inside a coil. This induces enough electricity to run the bicycle's lights. The faster the bicycle moves, the greater the induced voltage - and the brighter the lights.

Because of the bicycle's actions, the wheel turns a magnet internal a coil. This induces enough strength to run the bicycle's lighting fixtures. The faster the bicycle movements, the greater the caused voltage - and the brighter the lights.

A trendy dynamo creates an instantaneous modern-day (DC) – a one-directional waft of electrical rate. A bicycle dynamo creates an alternating current (AC), which reverses course from time to time.

A dynamo is a tool normally positioned inside the hub of a motorcycle's wheel that converts the energy generated by means of the wheel spinning to electric power. That energy is then used to run front and rear dynamo lights at the bike, offering constantly-on illumination without the want to change the lighting.

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Answer:

Explanation:

First we must know that the direction along the vertical are towards North and south while along the horizontal are towards east and west.

Sum of distances along the vertical

4km due north = +4km

3 Km South = -3km (south is along the negative y direction)

6 Km South = -6km

total distance along the vertical = 4-3-6 = -5km

Sum of distances along the horizontal;

8km due East = +8km

4 Km west = -4m (west is along the negative x direction)

total distance along the horizontal = 8-4 = 4km

Displacement is gotten by using Pythagoras theorem

d² = x²+y²

d² = (4)²+(-5)²

d² = 16+25

d² = 41

d = √41

d = 6.4km

Hence Tyler's displacement is 6.4km

Answer:

same as other person

Explanation:

Destruction of property from lava flow, destruction from mud flows and lung problems from ash and toxic gases are all some of the dangers that volcanoes pose to human populations.

Volcanoes refer to an opening that appears on the earth's surface and serves as a vent for lava, volcanic ash, and gases. These could lead to a fire outbreak in mountains sometimes.

The following are dangers posed by volcanoes pose to human populations;

Hence, the correct answer to the question is "all of the above".

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Answer:

D

Explanation:

EDGE 2021

There is no creation or destruction of energy; it can only be transformed from one form to another. This is also known as the law of energy conversion or the law of energy conservation.

Photosynthesis is a process used by plants to transform sun energy into a more useful form. Energy transformation is the name given to this procedure. Energy transformations are also used by people. The body transforms the food's stored energy into a form that may be utilized by the body. The action is referred to as cellular respiration. The cell transforms this chemical energy into a variety of other forms, including the energy of the chemical bonds in the molecules of its own substance, the mechanical energy of muscle contraction, and the electrical energy of nerve impulses, in a series of steps and with a minimal amount of heat loss.

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Answer:

this is what i did, hope it helps!

The Cold War was a rivalry between the United States and the Soviet Union, and it lasted for more than four decades. During this time, the two superpowers were engaged in a nuclear arms race.

This arms race increased tensions between the two countries and was one of the main causes of the Cold War. In this essay, we will examine how the arms race during the Cold War increased tensions.The arms race was a competition between the United States and the Soviet Union to develop more powerful nuclear weapons. Both countries wanted to have more weapons than the other, and this led to an escalation of tensions. As the United States developed more powerful weapons, the Soviet Union responded by developing its own. This led to a cycle of action and reaction that only increased tensions between the two countries.Both countries were afraid of a surprise attack from the other side. The United States was concerned that the Soviet Union would launch a first strike against them, while the Soviet Union feared the same from the United States. This fear led both countries to develop a policy of deterrence. Deterrence is the idea that a country can prevent an attack from another country by making it clear that it has the ability to retaliate with overwhelming force. The arms race made this policy of deterrence even more important because it increased the destructive power of each country's weapons.The arms race also had a psychological impact on the people of the United States and the Soviet Union. People on both sides began to fear the other country, and this fear only increased tensions. The arms race created a sense of paranoia that made it difficult for the two countries to trust each other. The fear of a surprise attack led to an arms race that only increased tensions between the United States and the Soviet Union.In conclusion, the arms race during the Cold War increased tensions between the United States and the Soviet Union. Both countries were engaged in a competition to develop more powerful nuclear weapons, and this led to a cycle of action and reaction that only increased tensions. The arms race made the policy of deterrence even more important, and it had a psychological impact on the people of both countries. The arms race was one of the main causes of the Cold War, and it was only resolved when both sides realized that they could not win a nuclear war.

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According to the evolution of a heating curve, the correct option is B. The plateau represents the change of a substance from one phase to another where temperature does not increase.

Heating curves are graphic representations of the relationship between a substance being heated or cooled and their changes in state as the temperature reaches certain values or rates.

In general,

Let us assume a solid substance is absorbing heat. The evolution of the curve will be as follows,

1) As temperature increases, the substance will absorb heat but it will not change in state. The curve will proportionally grow.

2) At a certain temperature, the substance will change from solid to liquid. At this point, the temperature will remain the same, but for a period, the substance will keep changing to the liquid phase. This is a plateau.

3) As temperature increases, the liquid will gain heat, but the substance will still be liquid. The curve will proportionally grow.

4) The substance will gain heat until temperature reaches a new transition value in which liquid initiates evaporation. At this point, there is a new plateau.

If temperature decreases, the process will be inverse. The substance will get cooled and will pass from gassy state to liquid and then from liquid to solid again.

For a better understanding, you will find a heating curve in the attached files.

The correct option is B. The plateau represents the change of a substance from one phase to another where temperature does not increase.

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Answer: d

Explanation:

After three half-lives, 1/8 (or 0.125) of the parent isotope remains. Thus, 0.125 times the parent atoms. The daughter isotope would be equivalent to the remaining parent isotope, 0.125 times the original number of parent atoms.

After three half-lives, the parent isotope has exponentially decayed, forming the daughter isotope. Each half-life reduces the parent isotope by half and increases the daughter isotope. Three half-lives have passed, reducing the parent isotope to 1/8 of its initial level. The rock sample would have 1/8 of the parent isotope.

The daughter isotope would have accumulated during decay. After three half-lives, the daughter isotope would have reached 3/8 of the parent isotope as each half-life creates one-half of it. After three half-lives, the rock sample would have 1/8 of the parent isotope and 3/8 of the daughter.

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hope this helps you !

Answer:

constant speed magnitude tells us how much distance it covers in every second.

Answer:

Explanation:

Lateral inversion is a phenomenon where the right seems to be on the left and left seems to be on the right.It occurs due to the direction is reflecting of a direct surface.An example of this is a mirror/window.A mirror is a better example to explain this! Hope this helps lemme know if u dont

The total mass of the objects is 5.05 kg, m₁= 3.35 Kg, m₂= 1.67 Kg is the mass of each.

What is mass ?

Determining inertia, a non-changeable feature of all objects. The main characteristic of a body of matter is the resistance it offers to a force-induced change in its speed or location.

What is magnitude ?

In simple terms, magnitude is "distance or quantity." It shows the size or motion of an object, either in terms of absolute size or relative motion. It is a method for describing a phenomenon's size or range. In physics, the term magnitude is frequently used to describe a length or size.

The concept required to solve this problem is the expression for gravitational force.

Initially, obtain the quadratic expression for the mass of the object by using the expression for gravitational force.

Finally, calculate the mass of the each object using the expression for the mass of the object.

The gravitational force is given by, F= G m₁m₂/ r²

Here, G is the universal gravitational constant,

r is the distance between the two objects and

m₁m₂ are the masses of the two objects.

The expression for the mass of the object is given as follows:

(5.02 kg - m₁) for m₂ in the equation F= G m₁m₂/ r²

G =  m₁ (5.02 kg - m₁) / r²

Fr² / G = m₁ (5.02 kg - m₁)

m²₁= - (5.02 kg - m₁) + Fr² / G = 0

The sum of the two masses is given by,

m₁+m₂= 5.02 kg

m₂= 5.02 kg-m₁

Calculate the mass of the each object as follows:

Consider force as 9.80 * 10 ⁻⁹ N

m₁= 3.35 Kg

m₂= 1.67 Kg

Therefore, the total mass of the objects is 5.05 kg, m₁= 3.35 Kg, m₂= 1.67 Kg is the mass of each.

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The acceleration lasted for 0.007s.

To find the answer, we need to know about the Newton's equation of motion.

Newton's equations are

V= final velocity, U= initial velocity, a= acceleration, t= time and S = distance

60²-0= 2a×0.2= 0.4a

Thus, we can conclude that the acceleration of the fireshell lasted for 0.007s.

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you can use formula:

\(\tt N_t=(\dfrac{1}{2}^n)N_o\\\\N_t=final\:mass\\\\N_t=initial\:mass\\\\n=number\:of\:half-life\)

Input the value:

\(15=120(\dfrac{1}{2}^n)\\\\\dfrac{15}{120}=\dfrac{1}{2}^n\\\\\dfrac{1}{8}=\dfrac{1}{2}^n\\\\\dfrac{1}{2}^3=\dfrac{1}{2}^n\Rightarrow \boxed{\bold{n=3\:half-lives}} \)

Very accurate measurements over a wide range of pressure have been made for large number of real gases.

The product of P cross product with V is not constant for any gases.

The real gases the dependence shows the deviation in partial pressures of individual gas molecules and azeotropes.

The curves extrapolated with compressibility factor with the constant product for some gases if pressures are very low.

\(\alpha =\frac{Pv}{RT}\\ \\\alpha =\left \{ {{1 - ideal} \atop {\neq 1-real}} \right.\)

From Charles law the volume approaching to zero means pressure attaining infinite value. The compressibility factor is an index of deviation from ideality.

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The frequency of the minute hand is 1/60 Hz. Given that the minute hand of a clock completes one revolution in one hour and there are 3,600 seconds in one hour.

To calculate the frequency of the minute hand: Frequency of the minute hand = No. of revolutions per secondFirstly, let us calculate the number of revolutions of the minute hand in one second.1 hour = 60 × 60 = 3600 secondsIn one hour, the minute hand completes 1 revolution. So, in 1 second, the minute hand completes 1/3600 of the revolution.Now, we can calculate the frequency of the minute hand.

Frequency of the minute hand = No. of revolutions per second Frequency of the minute hand = 1/3600 HzTo calculate the frequency of the minute hand, we can use the following steps: Step 1: Calculate the number of revolutions of the minute hand in one second.1 hour = 60 × 60 = 3600 seconds In one hour, the minute hand completes 1 revolution.

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You're pulling a wagon with a child in it and we want to find out how much work you're doing.

First, let's understand what work is. In physics, work is the energy transferred to or from an object when a force is applied to it and the object moves. The formula for work (W) is:

W = F * d * cos(θ),

where

- W is the work done,

- F is the force applied,

- d is the distance over which the force is applied, and

- θ (theta) is the angle between the force and the direction of movement.

In your example, you're pulling the wagon with a tension of 20 N in the handle, you're pulling it 170 m, and the angle between the handle and the ground is 60 degrees.

So, let's plug the numbers into the formula:

W = 20 N * 170 m * cos(60°).

Now, let's break this down even more.

1. Force (F): The force you're applying is the tension in the handle, which is 20 N (Newtons).

2. Distance (d): You're pulling the wagon for 170 m (meters), so that's the distance over which you're applying the force.

3. Angle (θ): The angle between the handle and the direction you're pulling is 60 degrees. When the angle is 0 degrees, the force is directly in the direction of movement, and when it's 90 degrees, the force is perpendicular to the direction of movement. At 60 degrees, the force is somewhere in between.

Now, cos(60°) is equal to 0.5. You can find this value using a calculator or trigonometry table. Let's plug this value into the equation:

W = 20 N * 170 m * 0.5

  = 20 * 170 * 0.5

  = 3400 * 0.5

  = 1700 Joules.

So, you do 1700 Joules of work pulling the wagon.

In simpler words, because you are pulling the wagon at an angle, not all of your force is used to move it in the direction you want. Only half of your force is actually pulling it forward, and this results in doing 1700 Joules of work.

Answer:

28.3 m/s

Explanation:

Vi = 45 Km/h = 12.5 m/s

Vf - Vi = at

Vf -12.5 = 0.45(35)

Vf= 28.3 m/s

Answer:

Once static friction gives up, it allows the box to begin sliding across the floor, the frictional force acting on the box, is now the force of sliding friction exerted by the floor on the box

Explanation:

.

Answer: Everything except heat and density

Explanation:

The frequency of an x-ray having a wavelength of 2.5×10⁻⁷ cm is 1.2×10¹⁷ Hz

We'll begin by converting the value of the wavelength from cm to m. Details below:

100 cm = 1 m

Therefore

2.5×10⁻⁷ cm = (2.5×10⁻⁷ cm × 1 m) / 100

2.5×10⁻⁷ cm = 2.5×10⁻⁹ m

Finally, we shall determine the frequency of the x-ray. This is shown below:

Velocity (v) = wavelength (λ) × frequency (f)

3×10⁸ = 2.5×10⁻⁹ × frequency

Divide both sides by 2.5×10⁻⁹

Frequency = 3×10⁸ / 2.5×10⁻⁹ m

Frequency = 1.2×10¹⁷ Hz

Thus, from the above calculation, we can conclude, the frequency is1.2×10¹⁷ Hz

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Answer:

zeros and ones

Explanation:

pls brainliest

The digital signals are generally in the form of zeros and ones.

The digital signals turn sounds into zeros and ones.

An electronic signal is transmitted as binary code that can be either the presence or absence of current, high and low voltages, or short pulses at a particular frequency. This signal is called a Digital Signal.

Digital signals take value in discrete form only at a given time.

Any digital signal can be converted into an analog signal with the help of a digital to analog converter.

If the sound signal is in the form of a digital signal, then it will turn the sound into the form of zeros and ones.

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Answer:

Water is important to showing there can be a chance there's life on the planet

Explanation:

Because if there no water to sustain living life it cannot have anything living on it

The normal force has a 25 N force magnitude and an upward force direction.

The force the book exerts on the table is downward-directed and equal to its weight, which is 25 N.

According to Newton's third law, every force an object A applies to an object B is balanced out by an equally strong force applied in the opposite direction to object A.

The book is object A in this instance, while the table is object B. According to Newton's third law, the table pulls on the book with a force that is both equal to and opposite to that of the force exerted by the table. As a result, the normal force's magnitude is the same as the weight of the book (25 N), while its direction is opposite.

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Answer:

22 cm ^3

Explanation:

P1 V1   = P2 V2         with constant mass and temperature

11 ( 5 x 10^5 ) =  x  ( 2.5 * 10^5)

x = 22 cm^3              ( when you 1/2 the pressure, you double the volume)

Answer:

80 amperes

Explanation:

Current = Voltage/Resistance

160/2 = 80

Answer:

its most definitely c. trust me

Explanation:

The image that shows the free body diagram of the bag pack is option J.

The term free body diagram has to do with the way the that the forces that act on an object are able to carry on. We know that an object is always acted upon by a system of forces. The forces that act on the object could be balanced or unbalanced. If the system of forces is balanced than the object would remain stationary. If the system of forces is not balanced then the object would move.

In this case, we have been told that high school student holds a backpack one meter above the ground. We know that we expect that the free body diagram would be able to show us the forces that act on the bag and this would include the weight of the bag which is the gravitational pull on it and the tension on the rope that holds the bag.

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