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From soonest to most recent: The globe is burned up by firestorms, an asteroid strike creates a crater, the atmosphere is clouded with dust, existing species perish due to the harsh environment, and new species emerge in ecological niches.

Because water is essential to life on Earth, scientists seek for it to point to potential habitats. Since these stars are long-lived enough for life to start and develop, astronomers believe that intelligent life is far more probable to exist in the vicinity of stars of types F, G, K, and M.

Astronomers can arrange their probabilistic thinking using the Drake equation. Since it can form lengthy chains that contain numerous additional atoms, carbon is a good building block for life.

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The more the kinetic energy of the object attached, more will be the maximum potential energy of the spring. Similarly, if object is hanging in vertical direction, maximum potential energy of the spring will be more if gravitational potential energy is high.

The spring potential energy depends on the kinetic energy and the gravitational potential energy of the object in the following way:

When an object is lifted to a certain height, it gains potential energy, which is referred to as gravitational potential energy. When an object is in motion, it possesses kinetic energy. When an object is compressed or stretched, it acquires potential energy, which is referred to as spring potential energy. Spring potential energy is the energy saved in the compressed or extended state of the spring. When the spring is no longer extended or compressed, it is released and the potential energy is transformed into kinetic energy. When the spring is compressed, its potential energy is at its maximum. When the spring is fully extended, the potential energy is at its minimum. When a force acts on the spring, it gains kinetic energy, which is transformed into spring potential energy after a certain distance.

Spring potential energy formula: Elastic potential energy = (1/2) kx²

Where,k = spring constant x = displacement of spring.

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The magnetic field strength required to bend alpha particles to a circular path of radius r=0.14 m is 0.1975 T.

Determining the magnetic field strength:

First, we are to calculate the magnetic field required to bend alpha particles to a circular path of radius r = 0.14 m using the equation;r = (mv) / (qB) Where r = 0.14 mm, v = 1.6 × [tex]10^{6}[/tex] m/sq = q, e = 1.6 × [tex]10^{-19}[/tex] C, B = magnetic field Strength (T).

By substituting the values given above into the equation, we have 0.14 = (6.6 × [tex]10^{-27}[/tex] × 1.6 × [tex]10^{6}[/tex])/(1.6 × [tex]10^{-19}[/tex] × B). Simplifying the equation further, we have B = 0.1975 T

Therefore, the magnetic field strength required to bend alpha particles to a circular path of radius r=0.14 m is 0.1975 T.

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The direction of acceleration of the flea is upward and the magnitude of acceleration is given by: a = [tex]\frac{F_{breeze}  - mg}{m}[/tex] where [tex]F_{breeze}[/tex] is the force exerted by the breeze on the flea, m is the mass of the flea, g is the acceleration due to gravity, and a is the resulting acceleration of the flea.

When the flea jumps, it exerts a force straight down on the ground, which according to Newton's third law, results in an equal and opposite force exerted by the ground on the flea, causing it to move upward. However, the breeze blowing parallel to the ground exerts a force on the flea in the opposite direction to its motion, which reduces the upward force exerted by the ground, and hence the acceleration of the flea.

To calculate the magnitude of acceleration of the flea, we need to find the net force acting on the flea. This is given by the difference between the force exerted by the breeze and the gravitational force acting on the flea, which is given by mg. The direction of the net force is upward since the force exerted by the breeze is in the opposite direction to the motion of the flea.

The magnitude of acceleration can then be calculated using Newton's second law, a =[tex]{F_{net}/m[/tex], where[tex]F_{net}[/tex] is the net force and m is the mass of the flea.

Therefore, the direction of acceleration of the flea is upward and the magnitude of acceleration is given by: a = [tex]\frac{F_{breeze}  - mg}{m}[/tex] where the force exerted by the breeze, F_breeze, and the mass of the flea, m, are given in the problem statement. The acceleration due to gravity, g, is approximately 9.8 m/s².

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Answer:

a) 1000000 g

b) 1000 km

c) 3,7 mg

d) 0,00125 mm

Explanation:

a) 1kg has 1000g, so we can make a proportion:

1 kg - 1000 g

1000 kg - x g

Use the property of the proportion to find x:

[tex]x = 1000 \times 1000 = 1 \times {10}^{6} \: g = 1000000 \: g[/tex]

b) 1 km has 1000 m, so let's do the same thing as we did earlier:

1 km - 1000 m

x km - 1000000 m

[tex]x = \frac{1000000}{1000} = 1000 \: km[/tex]

c) 1 g has 1000 mg and 1 kg has 1000 g, so 1 kg will have 1000 × 1000 =

[tex] {10}^{ 6} \: mg = 1000000 \: mg[/tex]

1 kg - 1000000 mg

0,0000037 kg - x mg

x = 0,0000037 × 1000000 = 3,7 mg

d) 1 m has 100 cm and 1 cm has 10 mm, so that means 1 m has 100 × 10 = 1000 mm

1 m - 1000 mm

0,00000125 m - x mm

x = 0,00000125 × 1000 = 0,00125 mm

I think I got it right

None of the given options result in a total resistance of 10Ω. Therefore, there is no correct answer among the options provided.To calculate the unknown resistance R of the circuit connected in series with a current of 2A and a battery voltage of 20V, follow these steps:

1. First, we need to determine the total voltage drop across the circuit. Since the battery voltage is 20V, the total voltage drop across all resistances in the circuit is also 20V.
2. According to Ohm's Law, Voltage (V) = Current (I) × Resistance (R). We are given the current (I) as 2A.

3. Now, we can use Ohm's Law to find the total resistance (R_total) of the circuit: V = IR → 20V = 2A × R_total → R_total = 20V/2A = 10Ω.
4. The problem states that all resistances are connected in series, which means the total resistance is the sum of all individual resistances: R_total = R1 + R2 + R3 + R (unknown resistance).

5. From the given options, we need to find the value of R that, when added to the other resistances, results in a total resistance of 10Ω.
6. By analyzing the options, we can see that the correct answer is:
a. 1Ω: R_total = 1Ω + 2Ω + 4Ω + 6Ω = 13Ω (not equal to 10Ω)
b. 2Ω: R_total = 1Ω + 2Ω + 4Ω + 2Ω = 9Ω (not equal to 10Ω)
c. 4Ω: R_total = 1Ω + 2Ω + 4Ω + 4Ω = 11Ω (not equal to 10Ω)
d. 6Ω: R_total = 1Ω + 2Ω + 4Ω + 6Ω = 13Ω (not equal to 10Ω)
e. 12Ω: R_total = 1Ω + 2Ω + 4Ω + 12Ω = 19Ω (not equal to 10Ω). Therefore none of the given option will be correct.

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Answer: C) thermal energy.

Explanation:The motion of Earth's molten rock (such as in the mantle) and the resulting patterns can be analyzed and explained scientifically by understanding the principles of thermal energy. This is because the movement of the molten rock is primarily driven by the transfer of heat and temperature differences within the Earth's interior, leading to processes like convection and heat conduction.

The acceleration of the center of mass of the cylinder is (2/3)g sinθ, and the minimum coefficient of friction between the cylinder and the inclined plane is μ_min = tanθ.

Acceleration is the rate of change of velocity of an object. It measures the rate at which an object's speed and direction changes. It is a vector quantity, meaning it has both magnitude and direction. Acceleration can be positive, negative, or zero. Positive acceleration indicates an object is speeding up, while negative acceleration indicates it is slowing down. Zero acceleration indicates an object is maintaining its current speed and direction.

Determine the translational speed of the cylinder when it reaches the bottom of the inclined plane.

b. Show that the acceleration of the center of mass of the cylinder while it is rolling down the inclined plane is (2/3)g sin theta.

c. Determine the minimum coefficient of friction between the cylinder and the inclined plane that is required for the cylinder to roll without slipping.

Answer:
a. The translational speed of the cylinder when it reaches the bottom of the inclined plane is given by v = (2gh sinθ/3)^1/2.

b. The acceleration of the center of mass of the cylinder is given by a = (2/3)g sinθ. This can be shown as follows: The acceleration due to gravity is g cos θ, so the normal force is Mg cos θ. The rotational inertia of the cylinder is 1/2MR², and its angular acceleration is a/R. By Newton's second law, the resultant force acting on the cylinder is ma = Mg cosθ - 1/2MR² a/R. Therefore, a = (2/3)g sinθ.

c. The minimum coefficient of friction between the cylinder and the inclined plane required for the cylinder to roll without slipping is μ_min = tanθ. This can be shown as follows: The force of friction acting between the cylinder and the inclined plane is given by F_f = μN = μMg cos θ. The force of friction must be equal to the centripetal force acting on the cylinder, which is Mv²/R. Therefore, μ = v²/gR = (2gh sinθ/3)^1/2/gR = tanθ.

In conclusion, we have shown that the translational speed of the cylinder when it reaches the bottom of the inclined plane is given by v = (2gh sinθ/3)^1/2, the acceleration of the center of mass of the cylinder is (2/3)g sinθ, and the minimum coefficient of friction between the cylinder and the inclined plane is μ_min = tanθ.

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Electromagnets are used to create a magnetic field which levitates the train above the track, and then by varying the current in the electromagnets, the train can be propelled forward or slowed down or stopped.

Maglev trains use the principle of electromagnetic suspension to levitate and propel the train. Electromagnets are placed on the underside of the train, and these electromagnets are energized with a current that creates a magnetic field.

This magnetic field interacts with the magnetic field of a conductor in the track, which creates an upward force that levitates the train above the track.

Once the train is levitated, the next step is to propel it forward. The same electromagnets that are used for levitation can be used to propel the train forward.

By varying the current in the electromagnets, the magnetic field created can be made to push or pull the train forward or backward. This process is known as magnetic propulsion or maglev propulsion.

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The amplitude of this constructive wave, for example, will be 6 metres.

It refers to the greatest departure from equilibrium that a periodic motion item may exhibit. As an example, consider how a pendulum moves through its equilibrium point (straight down) before expanding to its farthest point.

In most cases, amplitude is estimated by looking at a wave graph and determining the height of the wave from rest. The strength and intensity of the wave is gauged by its amplitude. For instance, the amplitude of a sound wave will indicate the volume of the sound.

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Answer: All matter is made up of very small particles called atoms.

Explanation:Atoms are the basic building blocks of ordinary matter

Answer:

a) The forces acting on the box and the table are as follows:

Weight of the box acting downwards (due to gravity)

Normal force acting upwards (from the table)

Frictional force (if the box is not moving, the frictional force will be equal and opposite to any force applied to move it)

b) The weight of the box is given by:

Weight = Mass x Acceleration due to gravity

Weight = 1.5 kg x 9.81 m/s^2

Weight = 14.715 N

The weight acts downwards due to gravity.

The counteraction force of the table is equal in magnitude and opposite in direction to the weight of the box, as per Newton's Third Law of Motion.

Therefore, the counteraction force of the table on the box is also 14.715 N, but it acts upwards to balance the weight of the box.

Explanation:

A bycle with 24-inch diameter wheels is travelling at 15mi/h. The angular speed of the wheels is 1319.2 rad/min.
The wheels make 210 revolutions per minute.

The first part of the question is asking for the angular speed of the wheel which is expressed in rad/min. The angular speed is defined as the rate at which an object changes its angle with respect to a fixed point.

The angular speed can be calculated using the formula:ω = v/r Where;ω = angular velocity, v = linear velocity, r = radius of the wheel

Let’s convert the speed given in miles/hour to meters/minute.

The conversion factor for miles to meters is 1 mi = 1609.34 m, and for hours to minutes is 1 hr = 60 min.15 mi/h = 15 × 1609.34 m/60 min = 402.34 m/min

The radius of the wheel is half of the diameter; r = 24/2 = 12 inches.

To convert inches to meters, we multiply by a conversion factor of 0.0254 m/inch.

Therefore; r = 12 × 0.0254 m/inch = 0.3048 m

Now, let’s substitute the values into the angular velocity formula; ω = v/r = 402.34 m/min/0.3048 m = 1319.2 rad/min

To calculate the number of revolutions per minute the wheels make, we can use the formula ;f = ω/2π Where; f = frequencyω = angular velocity = 1319.2 rad/min2π = 6.28f = 1319.2/6.28 = 210 revolutions/min

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Therefore, the answer is C. 23 mph is the maximum initial speed that would result in a skid mark of 70 ft with a friction coefficient of 0.25.

Initial velocity (u) squared plus two times the acceleration (a) times the displacement equals final velocity (v) squared (s). Final velocity (v) is equal to the square root of initial velocity (u) squared plus two times the acceleration (a) times displacement when v is the variable being solved for (s).

[tex]v^2 = u^2 + 2as[/tex]

Where:

v is the final velocity (0 mph, as the vehicle comes to a stop)

u is the initial velocity we want to find

a is the acceleration due to friction, which is equal to the friction coefficient multiplied by the acceleration due to gravity [tex](a = 0.25 * 32.2 ft/s^2 = 8.05 ft/s^2)[/tex]

s is the distance the vehicle traveled before coming to a stop, which is the length of the skid mark (s = 70 ft)

Substituting the given values into the equation, we get:

[tex]0^2 = u^2 + 2(0.25 * 32.2 ft/s^2)(70 ft)\\[/tex]

Simplifying:

[tex]0 = u^2 + 2(8.05 ft/s^2)(70 ft)\\0 = u^2 + 1134 ft^2/s^2\\u^2 = -1134 ft^2/s^2[/tex]

Since we cannot have a negative value for velocity, we can conclude that the initial velocity must be less than 23 mph.

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The force of gravity on a 3 kg object lying on the surface of a moon is 6 times greater than on a 3 kg object orbiting at a distance of three moon radii above the surface.

Gravity is the attractive force between two objects. The gravitational force between two objects is proportional to the product of their masses and inversely proportional to the square of the distance between their centers. The formula for the gravitational force is F = G(m1m2/r^2), where F is the force, m1 and m2 are the masses of the objects, r is the distance between the objects, and G is the gravitational constant.

The formula for the gravitational force is:

F = G(m1m2/r^2)

The force of gravity on the surface of a moon is:

F = G(m1m2/r^2) = (6.67430 × 10^-11 N m^2/kg^2) (7.342 × 10^22 kg) (3 kg) / (1.7371 × 10^6 m)^2F = 44.72188 N

The force of gravity on a 3 kg object orbiting at a distance of three moon radii above the surface is:

F = G(m1m2/r^2) = (6.67430 × 10^-11 N m^2/kg^2) (7.342 × 10^22 kg) (3 kg) / (1.7371 × 10^6 m * 3)^2F = 7.45365 N

Thus, the force of gravity on a 3 kg object lying on the surface of a moon is 6 times greater than on a 3 kg object orbiting at a distance of three moon radii above the surface.

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The consequences if the cosmological constant of hydrogen were slightly larger would be that the stars would have burned out too soon for life to be given a chance to form.

In cosmology, the cosmological constant is a constant term introduced by Albert Einstein into his field equations of general relativity. It represents the energy density of the vacuum of space.

In the theory of general relativity, it is presumed to act as a cosmological repulsive force for accelerating the Universe's expansion. The cosmological constant is widely considered one of the best contenders for dark energy.

According to present observations, dark energy accounts for approximately 68 percent of the total energy in the Universe, while the remaining 27 percent is dark matter, which cannot be detected by electromagnetic radiation. The remaining 5% is standard matter.

Hence, this means that the cosmological constant is essential in sustaining the Universe as it is.

To answer the question, the consequences of a slightly larger cosmological constant of hydrogen would be that the stars would have burned out too soon for life to be given a chance to form.

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Electrically charged objects attract or repel other charged objects without touching them. This is due to the force of attraction or repulsion between charged objects, which depends on their charges and the distance between them.

Electrically charged objects attract or repel other charged objects without touching them accurately describes electrically charged objects.

Electrically charged objects are those that have an imbalance of positive or negative charge.

These objects are either positively charged, meaning they have lost electrons, or negatively charged, meaning they have gained electrons. These charged objects can attract or repel other charged objects without touching them.

The force of attraction or repulsion between two charged objects is known as electric force.

The direction and strength of this force depend on the charges of the objects and the distance between them. Like charges (positive-positive or negative-negative) repel each other, while opposite charges (positive-negative) attract each other.

Electrically charged objects play an important role in many scientific and technological applications.

For example, the principles of electric charge are used in electrostatic precipitators to remove pollutants from the air, in the design of particle accelerators, and in the function of batteries and electrical circuits.

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We can see here completing the sentences, we have:

Right now, my biggest challenge in developing information literacy is understanding how to effectively evaluate sources for accuracy and reliability.

I'll know that I've overcome this challenge when I am able to confidently and consistently identify trustworthy sources of information and explain my reasoning for doing so.

Information literacy refers to the ability to identify, locate, evaluate, and effectively use information from a variety of sources. It involves a set of skills and competencies that enable individuals to effectively navigate the vast amounts of information available in today's digital age.

Continuation:

By the time I finish this course, I intend for my score on the Information Literacy section of the Discovery Wheel to be significantly higher than it is currently.

To overcome my biggest challenge in developing information literacy, I will practice evaluating sources regularly and seek feedback from peers and instructors.

To act on my intentions, I will adopt the following habits: regularly fact-checking information before accepting it as true, seeking out multiple sources to corroborate information, and utilizing critical thinking skills to evaluate the credibility of sources.

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In her book "The Power of Community: How Cuba Survived Peak Oil," author and activist, Naomi Klein, describes the work of Lisa Margonelli and her book "Oil on the Brain: Petroleum's Long, Strange Trip to Your Tank."

Margonelli, who toured the US to research her book, discovered that while Americans may have little idea about where their gasoline comes from or how it gets to their tanks, people who live in areas where oil and gas are extracted and refined understand all too well.

Lisa Margonelli wrote, “A lot of communities see the oil industry as either something that gives them jobs, or something that poisons their air, water, and soil. But what I came to see is that what people in those communities really want is not so much jobs or environmental protection. They want respect, democracy, and a say in their future."

Similarly, Neuwirth argues that people in communities such as those he profiled in his book need agency and empowerment. They need to have the ability to shape their own lives and futures, rather than being subject to the whims of outside interests such as developers or government officials.

This agency can take many forms, such as access to education and training, organizing and mobilizing around community issues, and the ability to build and sustain local businesses and economies. By providing these opportunities, these communities can begin to take control of their own destinies and build more sustainable, equitable futures.

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The charge on each sphere would be 5.89 × 10^-8 C.

The electrostatic force between two charged spheres is given by Coulomb's law:

F = (1/4πε) * (q1*q2)/r^2

In this case, the spheres have equal and opposite charges, so we can write:

F = (1/4πε) * (q^2)/r^2

where q is the charge on each sphere.

We are given that the force between the spheres is 103 N, the distance between them is 10 cm (0.1 m), and the dielectric constant of the medium is 5.

Substituting these values into the equation above, we get:

103 = (1/4π58.85*10^-12) * (q^2)/(0.1)^2

Solving for q, we get:

q = ± 5.89 × 10^-8 C

Since the spheres have equal and opposite charges, we take the absolute value of q to get the charge on each sphere:

q = 5.89 × 10^-8 C

Therefore, each sphere has a charge of 5.89 × 10^-8 C.

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According to the big bang theory, we live in a universe that is made of almost entirely of matter rather than antimatter because of a slight excess of matter over antimatter that occurred during the early universe.

This excess is thought to be due to a process called baryogenesis, which involves the production of baryons (such as protons and neutrons) from an initial state of pure energy during the first fractions of a second after the big bang.

The exact mechanism by which baryogenesis occurred is not well understood, but several possible theories have been proposed, including the idea that it is related to the violation of CP symmetry (which refers to the combination of charge conjugation and parity) in the early universe.

In any case, the slight excess of matter over antimatter meant that when matter and antimatter particles collided and annihilated each other during the early universe, there were more matter particles left over, which eventually led to the formation of the structures we see in the universe today.

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The cubic term increases the work needed to compress an ideal spring by: 66.67 percent.

The work required to compress an ideal spring is given by the equation W = (1/2)kx².
The cubic term, which is usually ignored in the linear force-extension equation, is introduced into the equation for work done because the spring's potential energy increases non-linearly as it is compressed.

The equation for work done on an ideal spring that takes into account the cubic term is:
W = (1/2)kx² + (1/3)kx³.From the above equation, it can be seen that the work done is increased by the cubic term.

The question is asking by what percentage the cubic term increases the work done over what would be needed to compress an ideal spring without the cubic term.
Here is the calculation: If we take out the cubic term from the above equation, we get W = (1/2)kx².
So the difference is (1/3)kx³, which is the contribution of the cubic term to the work done.
The percentage increase is given by:(0.333kx³ / 0.5kx²) x 100% = 66.67%

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The force applied to the box multiplied by 10m equals the work performed on the box from x = 0m to 10m.

The work done on the box from x = 0m to 10m is the product of the force applied on the box and the displacement of the box. The work done is calculated as:

Work = Force × Displacement

Therefore, the work done on the box from x = 0m to 10m is:

Work = Force Applied × (10m - 0m)

work = Force Applied × 10m

Therefore, the work done on the box from x = 0m to 10m is equal to the force applied on the box multiplied by 10m.

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The magnitude of the electric force on an electron at the negative plate is [tex]2.62 x 10^-16 N[/tex].

When a 9V battery is connected across two parallel plates separated by 5.5 mm of air, it creates an electric field between the plates, which in turn exerts a force on any charged particle placed in the field. To calculate the magnitude of the electric force on an electron at the negative plate, we first use the formula E = V/d to find the electric field strength. Substituting the given values, we get [tex]E = 1.64 x 10^3 N/C[/tex]. Then, using the formula F = qE, where q is the charge of an electron, we get the magnitude of the electric force as [tex]2.62 x 10^-16 N[/tex], with a negative sign indicating an attractive force towards the positive plate.

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This image illustrates the transition of electrical energy into chemical energy.

The process of converting electrical energy into molecular energy is called electrolysis of water. Through the use of an exterior current, hydrogen gas is being separated from water. The DC power source is connected to two inert electrodes—such as platinum or indium—that are submerged in water to perform water electrolysis.

Electrolysis is the process of converting electrical energy to molecular energy. When electrical energy is supplied from outside sources, an electrochemical reaction called electrolysis is set in motion.

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The ranks of the objects according to the magnitude of their momentum is object B > object A > object C.

Object A has a mass of m and a speed of v, Object B has a mass of m/2 and a speed of 4v, and Object C has a mass of 3m and a speed of v/3. To rank the objects according to their magnitude of momentum,

we must use the equation p = mv (momentum = mass x speed).

For Object A, p = mv = mv.
For Object B, p = mv = (m/2)(4v) = 2mv.
For Object C, p = mv = (3m)(v/3) = mv.

From the equation we can see that Object B has the greatest magnitude of momentum as its momentum is twice that of Object A and C. Objects A and C have the same magnitude of momentum, but Object C has a higher mass. Therefore, the order of the objects according to their magnitude of momentum is:

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If Dr. Hewitt cuts the broom exactly through its center of gravity, then the weights of the two sides of the broom will be equal.

This is because the center of gravity is the point at which the weight of the object can be considered to be concentrated, and cutting the object at this point would result in two halves of equal weight.

However, it is important to note that if the broom is not perfectly symmetrical, the location of the center of gravity may not be at the exact physical center of the broom. In this case, Dr. Hewitt would need to locate the actual center of gravity of the broom and cut it at that point to achieve equal weights on each side.

Nonetheless, if the broom is cut exactly at its center of gravity, the weights of the two sides of the broom will be equal regardless of its shape or size.

Therefore, if the broom is cut exactly at its center of gravity, each half will have half the total weight of the broom.

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Answer:

"Translation" simply means moving. In a translation, every point of the shape must move the same distance and in the same direction.

The minimum time Brandon can swim at 2 m/s is 144.5 seconds and run at 4 m/s is 55 seconds, with the distance traveled diagonally being 289 m

We have to find the minimum amount of time taken to reach the other side, as Brandon wants to reach a point 300 m downstream on the opposite side as quickly as possible by swimming diagonally across the river and then running the rest of the way.

So, the distance he covers in water = distance diagonally in water

And, the time he takes to cover this distance in water = distance/Speed => t = diagonal distance/speed of swimming

Also, the distance he covers in running = perpendicular distance

And, the time he takes to cover this distance in running = distance/Speed => t = perpendicular distance/speed of running

Given:

Width of river = AB = 80 m

Distance to reach = AC = 300 m

Speed of Swimming = 2 m/s

Speed of Running = 4 m/s

The minimum time taken will be the time taken to cover the total distance i.e. AB + BC

We know that AC = AB² + BC² (by Pythagoras theorem)

We have AC = 300, AB = 80, and speed of swimming = 2 m/s. Let BC = x, then we have:

x² = √(300² - 80²)

x² = √(90.000 - 6400)

x² = √(83.600)

x  = 289 m

So, the time he takes to cover this distance in water is:

t = diagonal distance/speed of swimming

t = BD/Speed of swimming

t = 289/2 = 144.5

Now, he covers the remaining perpendicular distance CD by running which is equal to 220m

The time he takes to cover this distance in running is:

t = perpendicular distance/speed of running

t = CD/Speed of running

t = 220/4 = 55 s

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