An olympic athlete set a world record of 9.49 s in the 100-m dash. did his speed ever exceed 37 km/hr during the race? explain.

The metal sample with a density of 1.56 g/l and a volume of 250ml , has a mass of: b) 0.39 grams

The density formula and the procedure we will use is:

ρ = m/v

Where:

Information about the problem:

Converting the volume unit from mL to L, we have:

250 mL * (1 L / 1000 mL) = 0.25 L

Applying the density formula and clearing the mass (m), we get:

m = ρ * v

m = 1.56 g/L* 0.25 L

m = 0.39 g

Although part of your question is missing, you might be referring to these group of answer choices: a)6.24 grams; b)0.39 grams; c)0.16grams; d) 0.59 grams

It is a physical quantity that expresses the ratio of the body mass to the bit occupies.

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Answer: 11.76 hours

Explanation:

I have attached an image explaining the answer

Answer:

yes it's the right answer...............

The weight of the combined system = 1,996.3 N

Given,

Mass of the Plastic tank = 3.5 kg

Volume of the liquid water in the tank = 0.2 m³

Density of water = 1000 kg/m³  

Now,

We know

Density = Mass ÷ Volume

Thus,

Mass = Density × Volume

therefore,

Mass of the water in the tank = 1000 × 0.2

= 200 kg

Thus,

The mass of the combined system = 3.5 kg + 200 kg = 203.5 Kg

Also,

Weight in N = Mass × Acceleration due to gravity (g)

and,

g = 9.81 m/s²

Therefore,

The weight of the combined system = 203.5 kg × 9.81 m/s²

= 1,996.3 N

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The name of the temperature zone that includes the equator is Zone C and is referred to as the tropical zone.

This is referred to as the type of zone which is characterized by areas or regions around the equator. The name tropical was coined from its distinct climate which is usually warm all year round as a result of its very high sun exposure.

The degrees of latitude which this zone covers is 23.5 degrees and is south of the Equator which is therefore the reason why it was chosen as the most appropriate choice.

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The wavelength released in transition energy is 4.23 x 10¯⁶ m.

We need to know about transition energy to solve this problem. Electrons in a hydrogen atom can move to another level of energy. It is also called a transition. In this process, electrons will absorb or release their energy to move. The transition energy can be determined as

ΔE = E2 - E1

where ΔE is transition energy, E2 is the final state of energy and E1 is the initial state of energy.

The state energy of a hydrogen atom can be calculated by

E = -(13.6) / n² eV

E = h.c / λ

where n is the number of energy states, h is Planck constant (4.136 x 10¯¹⁵ eV/Hz), c is speed of light (3 x 10⁸ m/s) and λ is wavelength.

From the question above, we know that

n1 = 5

n2 = 2

By substituting the following parameter, we get

ΔE = E2 - E1

ΔE = -(13.6) / n2² - (-(13.6) / n1²)

ΔE = -(13.6) / 2² - (-(13.6) / 5²)

ΔE = 0.544 - 0.85

ΔE = -0.306 eV

the energy is minus because it got released.

Calculate the wavelength released

ΔE = 0.306 eV

h.c / λ = 0.306 eV

4.136 x 10¯¹⁵ . 3 x 10⁸ / λ = 0.306

λ = 4.23 x 10¯⁶ m

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Charge,Q = 6.48 × [tex]10^-^9[/tex] C

It is given that,

Electric field strength, E = 180000 N/C

Distance from a small object, r = 1.8 cm = 0.018 m

Electric field at a point is given by :

[tex]E=\frac{KQ}{r^2}[/tex]

Q is the charge on an object

[tex]Q=\frac{Er^2}{k}[/tex]

Q = [180000 × [tex](0.018)^2[/tex]] ÷ 9 × [tex]10^9[/tex]

Q = 6.48 × [tex]10^-^9[/tex] C

So, the charge on the object is Q = 6.48 × [tex]10^-^9[/tex] C . Hence, this is the required solution.

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86.925 km

1=runner v1= 4.1km/h = 1.13m/s, here v1 and v2 is velocity

2=bird v2=12.3km/h = 3.41 m/s

bird covers 7100 m in t=7100/3.41=2082 s

at same time runner has traveled x=1.13  * 2082=2352.6

the remaining distance of 7100-2352=6865 m is traveled by runner an bird

6865=v1t+v2t

then t=6865/(1.13+3.41)=23410 s

the distance traveled by bird is

x2=7100+v2t

=7100+3.41*23410

x2=86928m = 86.925 km

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The big o notation of the worst-case scenario of pushing back an

element into a queue implemented using a list is Array or a Linked list.

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The final magnification will be 100X.

The light compound microscope contains two lenses to assist viewing of small objects. The two lenses are ocular lens and objective lens. Ocular lens is in the eyepiece and magnifies the image. Objective lens is near the sample and magnifies the object. Ocular lens is always 10X. Now, if we use objective lens of 10X, the magnification will be calculated by multiplication. So, the final magnification of the microscope will be 100X.

Compound microscope is commonly used to view the samples in magnification ranging from 40X to 1000X. There are variety of microscopes that provide detailed and highly magnified images, for instance, fluorescence microscope, digital microscope, electron microscope etc.

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Light with a frequency of 7.30 x 10¹⁴ that lies in the violet region of the visible spectrum has a wavelength of 412nm.

The wavelength of light can be defined as the distance between two successive crests, or troughs of a wave of light, usually denoted by the Greek letter, lambda (λ).

Wavelength is directly proportional to frequency. This means that the shorter the wavelength, the higher the frequency. To find the wavelength of any electromagnetic wave if we are given the frequency, we use the following formular:

                    λ = [tex]\frac{v}{f}[/tex]

Where;

The velocity or speed of light is the same for all electromagnetic waves which is 3 x 10⁸m/s. We are already given the frequency in the question as 7.30 x 10¹⁴hz. Putting these values into the formular:

                      λ = 3 x 10⁸/7.30 x 10¹⁴

                      λ = 4.12 x 10⁻⁷m

However, to convert the wavelength from meter to nanometer, we would have to multiply the answer by 10⁹. Therefore;

                  λ = 4.12 x 10⁻⁷m x 10⁹ = 412nm

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The distance between the second-order fringes for these two wavelengths is 0.3 × 10—³ m.

The wavelength of first light is,

[tex]λ _{1} = 720 \: nm = 720 \times 10 ^{ - 9} \: m[/tex]

The wavelength of the second light is,

[tex]λ _{1} = 660 \: nm = 660 \times 10 ^{ - 9} \: m[/tex]

The separation is d.

d = 0.61 mm

[tex]d = 0.61 \times 10 ^{ - 9} \: m[/tex]

The distance of the screen is D.

D = 1 m

For wavelength 1 the distance of the second fringe is,

The number of fringes is 2.

[tex]x _{n} = \frac{nλD}{d} [/tex]

[tex]x _{2} = \frac{2 \times 720 \times 10 ^{ - 9} \times 1.5}{0.61 \times 10 ^{ - 3} } [/tex]

[tex] = 3.5 \times 10 ^{ - 3} [/tex]

For wavelength 2 the distance of the second fringe is,

[tex]x ^{'} _{n} = \frac{nλD}{d} [/tex]

[tex]x ^{'} _{2} = \frac{2 \times 660 \times 10 ^{ - 9} \times 1.5}{0.61 \times 10 ^{ - 3} } [/tex]

[tex]x ^{'} _{2} = 3.2\times 10 ^{ - 3} [/tex]

The distance between the second-order fringes for these two wavelengths on a screen 1.5 m away is,

[tex]∆x = x _{2} - x ^{'} _{2} [/tex]

[tex] = (3.5 \times 10 ^{ - 3} - 3.2 \times 10 ^{ - 3} )[/tex]

[tex] = 0.3 \times 10 ^{ - 3} \: m[/tex]

Therefore, the distance between the second-order fringes for these two wavelengths is 0.3 × 10—³ m.

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The square of the distance has an adverse relationship with the electrical force.

The square of the distance has an adverse relationship with the gravitational force.

The fundamental distinction between electrostatic and gravitational forces is that gravitational force is the force that draws objects to the earth based on mass. This force is conservative. While an object's electrostatic force is its force as a result of charge. Moreover, it is a conservative force.

Electric force is the attractive or repulsive interaction between any two charged bodies. Similar to any force, Newton's laws of motion describe how it affects the target body and how it does so.

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The minimum horizontal velocity must the cliff divers leave the top of the cliff if they miss the rock would be 2.86 m/s.

It is the rate of change of an object's position with regard to time and a frame of reference. Although it may appear sophisticated, velocity is just the act of moving quickly in one direction. Since it is a vector quantity, the definition of velocity requires both magnitude (speed) and direction.

SI unit of velocity is m/s.

Velocity= displacement/ time

There are different types of velocity :

According to the question :

h=[tex]V_o[/tex]×t +0.5(g)(t²)

=0+0.5(9.8)(t²)

⇒4.9 t²=33.7

⇒ t²=6.89

so, t=2.62 seconds

d=v×t=7.51 m

⇒2.62 V=7.51 m

V=7.51/2.62

V=2.86 m/s

Hence, the minimum velocity must be 2.86 m/s.

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The total pressure is 0.89 atm of the flask containing a mixture at 15° C

The force delivered perpendicularly to an object's surface per unit area across which that force is dispersed is known as pressure. In comparison to the surrounding pressure, gauge pressure is the pressure. Pressure is expressed using a variety of units.

IT is defined as the amount of force exerted per area , so to make a large amount of pressure one can exert a large force or exert a small force for smaller area  , it's S.I unit is pascal

total pressure = sum of all the partial pressure

So total pressure (Ptotal ) = partial pressure of N2 + partial pressure of He + partial pressure of Ne

= (0.32 + 0.15 + 0.42) atm.

= 0.89 atm

So Ptotal = 0.89 atm.

the question is a bit incorrect,

the temperate of the flask is actually 158° C.

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The mass of a 100.0 cm3 chunk of this steel is  810 grams.

What is Density?

A substance's density is defined as its mass per unit of volume. Density is most frequently represented by the symbol, however Latin letter D may also be used. Density is mathematically defined as mass divided by volume.

Density = Mass/ volume

Mass = density x volume

Mass at 100 cm3 = density x volume x 100 cm3

Mass at 100 cm3 = 8.1 g/cm x 100 cm 3

Mass at 100 cm3 = 810 grams

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In the competitive forces model, the central element that the other four elements contribute directly to strength is rivalry among established firms in the industry.

The Competitive Forces Model is an essential technique in strategic analysis for analyzing an industry's competitiveness. The concept is most widely known as Porter's Five Forces Model. It consists of the following five forces: rivalry intensity, threat of possible new entrants, buyer negotiating strength, supplier bargaining power, and threat of alternative products and/or services. Among all the five forces, rivalry among established firms contributes to strength.

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The proportion of total mass of Earth lost every year is 6 x 10²⁰ kg.

Heisenberg's uncertainty principle states that it is impossible to measure the exact position and the momentum of an object at the same time, or energy and time. The more certain one is variable is, the more uncertain the other variable is.

The more accurate we measure position of the object, the more uncertain the momentum of the object becomes.

The uncertainty in the measurement of the mass of the Earth can be assumed to be (1 x 10⁻² %).

The proportion of the mass mass of Earth lost every year is calculated as follows;

m = (0.01/100) x 6 x 10²⁴ kg

m = 6 x 10²⁰ kg

Thus, the proportion of total mass of Earth lost every year is 6 x 10²⁰ kg.

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The final pressure of ammonia if there is no change in temperature is 1.575atm.

A given mass of gas has a pressure that is inversely proportional to its volume at constant temperature. The gas rules of Boyle are followed in this query.

The mathematical notation is as follows:

[tex]P_{1} V_{1} = P_{2} V_{2}[/tex]

Rearranging the formula so that pressure [tex]P_{2}[/tex] is the formula's subject;

[tex]P_{2} = \frac{P_{1}V_{1} }{V_{2} }[/tex]

Plugging in the values we get:

[tex]P_{2} = \frac{(0.920)(80.3)}{(46.9)}[/tex]

[tex]P_{2} = 1.575atm[/tex]

Therefore,  the final pressure of ammonia if there is no change in temperature is 1.575atm.

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Answer:

Animals that use the position of the sun to navigate need an internal 'clock' to keep track of time because the position of the sun changes throughout the day. By knowing what time it is, these animals can accurately determine their location and find their way back to their home. Examples of animals that use the sun to navigate include bees and migratory birds.

What is an internal clock?

An internal clock is a physiological mechanism that tracks the passage of time. It is found in most animals and is responsible for regulating the daily activities of the organism, such as feeding, mating, and sleeping.

Explanation:

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Since motion under gravity only act on the vertical component of the velocity, the answer for both vertical and horizontal variables are;

a.) 9.8 m/s², 0

b.) 0, 18 m/s

c.) 21.2 m/s, 0

d.) 23 m, 39 m

e.) 2.2 s

Motion of any object under gravity is the vertical motion of the object under the influence of acceleration due to gravity.

From the question, the following parameters are given.

a.) The vertical acceleration will be equal to acceleration due to gravity which is equal to 9.8 m/s². While the horizontal acceleration will be equal to zero.

b.) The vertical initial velocity is zero. Vertically, it will be assumed that the stone is dropped. While the given initial velocity is the horizontal initial velocity which is 18 m/s

c.) The vertical final velocity V can be calculated by using the formula

V² = U² + 2gH

V² = 0 + 2 × 9.8 × 23

V² = 450.8

V = √450.8

V = 21.23 m/s

Motion under gravity only act on the vertical component of the velocity. so, horizontal final velocity is equal to zero.

d.) Vertical distance = 23 m

While the horizontal distance = Range = ut

e.) Both the vertical and horizontal time will be the same. We can calculate the time by using the formula

h = ut + 1/2gt²

Vertically, u = 0

23 = 0 + 1/2 × 9.8 × t²

23 = 4.9t²

t² = 23/4.9

t² = 4.694

t = √4.69

t = 2.166 s

t = 2.2 s

so, the range = 18 × 2.166 = 38.997 m

Therefore, the time taken is 2.2 and the range is approximately 39 m.

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Galileo’s astronomical observations  that were best explained by a heliocentric model is "The phases of Venus can only occur the way they do if Venus is orbiting the Sun".

What about the heliocentric model was accurate?

Instead of Earth, as was previously thought to be the case according to the geocentric model, the heliocentric concept puts the Sun at the core of the solar system. Our increased grasp of astronomy was built on this advancement, which brought us closer to the true nature of the solar system and the universe.

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The time taken for the object to fall the same distance in planet X is determined as 8.5 seconds.

The time taken for the object to fall the same distance on planet X is calculated as follows;

t = √2h/g

where;

t² = 2h/g

gt² = 2h

g₁t₁² = g₂t₂²

t₂² = g₁t₁²/g₂

t₂² = (g₁ x 3.8²) / (0.2g₁)

not e one-fifth = 1/5 = 0.2

t₂² = 72.2

t₂ = √72.2

t₂ = 8.5 seconds

Thus, time taken for the object to fall the same distance in planet X is determined as 8.5 seconds.

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The event that will happen will depend on the mass of the spheres and will result in one of the spheres being attracted to the other by gravity  into its gravitational field.

Gravity is a force which causes mutual attraction between all objects that possess mass or energy.

Examples of gravity include:

Gravity is one of the four fundamental forces present in the universe.

Gravity is important in several ways such as:

The suddenly appearance of an identical sphere 1 trillion kilometers away from the original sphere in the universe will cause the spheres to attract each other into their gravitational field with a force that depends on the mass of the spheres.

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238820.22 calories of heat are produced in the stopping process if the car mass is 1000 kg.

We need to understand the concept of heat, the SI unit of heat, and what a calorie is in order to answer this problem. Most of us use the word "heat" to describe anything that feels warm, but according to science, heat is the movement of energy from a warm object to a cooler one. Based on this, heat is divided into two categories: hot and cold. Icebergs, volcanoes, and even human bodies contain heat energy.

v = 100 mph

v = 100 mph = 44.704 m/s

Energy = [tex]1/2m(v_f^2- v^2)[/tex]

The heat generated = [tex]1/2 \times1000\times 44.704^2[/tex]

H= 999223.828 J

H= 238820.22 Calorie

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2.2cm^3

As per the statement the given measurement of different volumes

Let consider

V1 = 2.1cm^3

V2 = 2.1cm^3

V3 = 2.4cm^3

Now, we are supposed to find the mean value

mean value = submission of total number observation÷ sum of no. of observation

mean value = 2.1+2.1+2.4÷ 3

mean value = 6.6÷3

mean value= 2.2cm^3

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It is a physical field occupied by a charged particle on another particle in its surrounding .The magnitude of electric field will be -0.0241 MN/C.

What is electric field?

A physical field called an electric field surrounds electrically charged particles and attracts or repels all other charged particles nearby. It can also refer to the physical field surrounding a system of charged particles. Electric charges and time-varying electric currents are the building blocks of electric fields. The electromagnetic field, one of the four fundamental interactions (also known as forces) of nature, manifests itself in both electric and magnetic fields.

The electric force in an electric field is given by the equation,

 [tex]E = \frac{F}{Q}[/tex]

Since electric field is balanced by the weight of the plastic sphere, the electric force is equal to weight of the sphere.

[tex]F = mg[/tex]

So the equation becomes

[tex]E = \frac{mg}{Q}[/tex]

Putting the value from the question,

m = 0.0074 kg

Q = (-3.0) Nc

g (gravitational acceleration) = 9.8 m/s^2

So, we get

[tex]E = \frac{(9.8)(0.0074)}{(-3.0)}[/tex]

[tex]E = -0.0241 MN/C[/tex]

Hence, the electric field is -0.0241 MN/C.

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150 will be: stratified sample.

The partitioning of a population into smaller subgroups known as strata is a key component of the sampling technique known as stratified random sampling. In stratified random sampling, also known as stratification, the strata are created based on the shared traits or features of the members, such as wealth or level of education. Numerous uses and advantages of stratified random sampling include examining life expectancy and population demography.

Proportional or quota random sampling are other names for stratified random sampling. Researchers can produce a sample population that most accurately represents the whole population under study using stratified random sampling. Sampling is the process of drawing conclusions about a population using a small sample.

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