72. An object travels at a constant velocity of 15 m/s for 5.0 seconds. How far does
it move during that time?

Kinematics equation/2

The NPSH (ft) available is approximately 120 ft. The correct option is C.

To calculate the Net Positive Suction Head (NPSH) available, we need to use the following formula:

\(NPSH (ft) = \left[\dfrac{(P - Pv)} {(\rho \times g)}\right] - \left\dfrac{V^2} { (2 g)}\)

Where:

Given:

Calculating NPSH:

P = 164 psig + 14.7 psia (converting psig to psia)

= 178.7 psia

Calculate the density,

ρ = 0.89 x 62.4

ρ = 55.536  \(\dfrac{lb}{ft^3}\)

The velocity is calculated as,

V = 3.66  x 3.28

V = 12.0288  \(\dfrac{ft}{s}\)

\(NPSH (ft) = \dfrac{(178.7 - 134 ) (55.536 * 32.2 )] - (12.0288) } { (2 \times 32.2 )}\)

\(NPSH (ft) = \dfrac{44.7 (1783.1712)] - (0.1888 ) }{ 64.4 }\)

NPSH (ft)  = 120 ft

Therefore, the NPSH (ft) available is approximately 120 ft.

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Gauge pressure required in city water mains for a stream is 147,150 Pa

In fluid mechanics, Bernoulli's principle states that an increase in fluid velocity occurs simultaneously with a decrease in pressure or a decrease in the fluid's potential energy. This principle is named after the Swiss mathematician Daniel his Bernoulli published it in his 1738 book Fluid Mechanics.

According to the Bernoulli's Equation:

P₁ + ρgy₁ + (\(\frac{1}{2}\))ρv₁² = P₂ + ρgy₂ + (\(\frac{1}{2}\))ρv₂²

where, y₁ =  initial height

y₂ = final height

Initial height is 0 meters and final height is 15 meters.

The problem states that the mains have a much larger diameter than the hose, so v₁ = 0

Once our water reaches a 15 m. altitude, it stops going anymore higher. Therefore, v₂ also be 0.

P₁  = P₂ + ρgy₂

Since, we are solving for gauge pressure, we can assume that the pressure at the top of our column of water is zero.

P₁  = ρgy₂

P₁  = 1000 × 9.8 × 15

P₁  = 147,150 Pa

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Answer:

a) What is the car’s average acceleration?  

5.33 m/s^2 [Backward]

b) What is its initial velocity?

27.99 m/s [Foreward]

A net torque of \(6.0×10^−3 N⋅m\) is sufficient to produce the desired angular acceleration of \(150 rad/s^2\).

The net torque required to produce an angular acceleration in a rotating object can be calculated using the formula: net torque = moment of inertia × angular acceleration In this case, the moment of inertia of the grinding wheel is given as 4.0×10^−5 kg⋅m^2 and the angular acceleration required is 150 rad/s^2.

Therefore, the net torque required can be calculated as: net torque = \((4.0×10^−5 kg⋅m^2) × (150 rad/s^2) = 6.0×10^−3 N⋅m\)To explain this result, we need to understand the relationship between torque and angular acceleration. Torque is the rotational equivalent of force and it is defined as the product of force and the perpendicular distance between the line of action of the force and the axis of rotation.

When a torque is applied to a rotating object, it produces an angular acceleration in the object, which is a measure of how quickly the object's rotational speed changes.

The moment of inertia of an object is a measure of its resistance to changes in its rotational motion. It depends on the object's mass distribution and the distance of each element of mass from the axis of rotation. Objects with larger moments of inertia require more torque to produce a given angular acceleration than objects with smaller moments of inertia.

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The number of valence electrons in neutral atoms equals the atom's main group number. A periodic table column can be used to determine an element's main group number.

The position-time graph depicts the movement of an item across time. Time in seconds is traditionally represented on the x-axis, while object location in metres is plotted along the y-axis. The slope of the position-time graph offers vital information about the object's velocity.

Gravity causes objects in free fall to accelerate. As a result, the free fall motion position-time graph must be curved. This means that objects in free fall begin with a moderate velocity and gradually accelerate, as illustrated by the graph's steep downward curve.

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Properties seen in network covalent compound are : high melting and boiling points, hardness, insolubility in polar solvents, electrical insulators.

A network covalent compound is a type of covalent compound where the atoms are bonded together by a continuous network of covalent bonds, forming a giant molecule or a macromolecule.

Some of the properties you would expect to observe with a network covalent compound are:

High melting and boiling points: Network covalent compounds have strong covalent bonds throughout the structure, so a large amount of energy is required to break these bonds, resulting in high melting and boiling points.

Hardness: The strong covalent bonds between atoms in network covalent compounds make them rigid and hard, which is why many of these compounds, such as diamond and silicon carbide, are used as abrasives.

Insolubility in polar solvents: Network covalent compounds are typically insoluble in polar solvents like water because the polar molecules cannot break the strong covalent bonds between the atoms in the network.

Electrical insulators: Most network covalent compounds are electrical insulators because they have no free electrons or ions to carry an electric current.

Brittle: Due to the strong covalent bonds, network covalent compounds are typically brittle, meaning that they fracture easily when subjected to stress.

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Answer:

thank you very much for giving me points.

Explanation:

I really appreciate it so muchhhhh so muchhhh thanks again

Answer:

C) the air outside your home in July

Explanation:

Answer:

B: Shouting under water in a swimming pool

Explanation:

because it's the only medium size that will be able to sound wherever you're swimming!!!!

Your words from swimming pool will sound faster than others

Answer: 180 m south

Explanation:

The displacement of the horse in this time is 180 m south. The correct option is A.

The displacement is the shortest distance travelled by the particle. It is the vector quantity which re[presents both the magnitude and direction.

Velocity is the time rate of change of displacement with time.

Given is a horse runs for 15 seconds to the south at a speed of 12 m/s. So, the displacement is

Displacement = Speed x Time

Put the values, we get

Displacement = 12 m/s x 15s

                      = 180 m

Thus, the displacement of the horse in this time is 180 m south.

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Answer:

4.489 m/s

Explanation:

We are given;

Length of rod;L = 51.4 cm = 0.514 m

When the ball is at the top end, it's velocity will be zero and it's kinetic energy will be transformed to potential energy.

Thus; ½mv² = mgh

m will cancel out to give;

v² = 2gh

Where:

g is acceleration due to gravity = 9.8 m/s²

h is the maximum height of the ball which is equal to twice the length of the rod.

Thus, h = 2(0.514) = 1.028 m

v² = 2 × 9.8 × 1.028

v = √20.1488

v = 4.489 m/s

1. The wavelength of the wave is 0.4 m

2. The frequency is 10 Hertz

3. The wavelength will be half the original wavelength.

4. The frequency of the wave is 0.05 Hertz

The wavelength of the wave can be obtain as follow:

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

800 = wavelength × 2000

Divide both sides by 2000

Wavelength = 800 / 2000

Wavelength = 0.4 m

The frequency of the wave can be obtain as illustrated below:

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

10 = 1 × frequency

Frequency = 10 Hertz

The wavelength of the wave can be obtain as shown below:

v = fλ

Since v is constant, we have

f₁λ₁ = f₂λ₂

Thus, we have:

f × λ = 2f × λ₂

Divide both sides by 2f

λ₂ = fλ / 2f

λ₂ = λ / 2

Thus, we can conclude that the wavelength will be half the original wavelength

The frequency of the wave can be obtain as shown below:

Frequency = Number of wave / time taken

Frequency = 6 / 120

Frequency = 0.05 Hertz

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Answer:

1. The wavelength of the wave is 0.4 m

2. The frequency is 10 Hertz

3. The wavelength will be half the original wavelength.

4. The frequency of the wave is 0.05 Hertz

1. How do i determine the wavelength?

The wavelength of the wave can be obtain as follow:

Frequency of wave (f) = 2.0 KHz = 2.0 × 1000 = 200- Hz

Speed of wave (c) of = 800 m/s

Wavelength (λ) = ?

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

800 = wavelength × 2000

Divide both sides by 2000

Wavelength = 800 / 2000

Wavelength = 0.4 m

2. How do i determine the frequency?

The frequency of the wave can be obtain as illustrated below:

Speed of wave (v) = 10 m/s

Wavelength of wave (λ) = 1 m

Frequency of wave (f) =?

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

10 = 1 × frequency

Frequency = 10 Hertz

3. How do i determine the wavelength?

The wavelength of the wave can be obtain as shown below:

Initial frequency (f₁) = f

Initial wavelength  (λ₁) = λ

Speed = Constant

New frequency (f₂) = 2f

New wavelength (λ₂) =?

v = fλ

Since v is constant, we have

f₁λ₁ = f₂λ₂

Thus, we have:

f × λ = 2f × λ₂

Divide both sides by 2f

λ₂ = fλ / 2f

λ₂ = λ / 2

Thus, we can conclude that the wavelength will be half the original wavelength

4. How do i determine the frequency?

The frequency of the wave can be obtain as shown below:

Time taken = 2 minutes = 2 × 60 = 120 seconds

Number of wave = 6 complete waves

Frequency =?

Frequency = Number of wave / time taken

Frequency = 6 / 120

Frequency = 0.05 Hertz

Explanation:

ANSWER:

3.04 m/s

STEP-BY-STEP EXPLANATION:

Given:

Acceleration (a) = 1.9 m/s²

Since starting from rest the initial velocity (u) is 0 m/s

Distance (d) = 8 ft

We must convert feet to meters, knowing that 1 foot is equal to 0.3048 meters

Therefore:

Applying the following formula we calculate the velocity at the bottom of the ramp, that is, the final velocity:

The velocity of the ball at the bottom of the ramp is 3.04 m/s

Answer:

Well if they playing a game like that

Energy and matter are closely related.

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Answer:

The correct option is;

(A) 25.8 cmHg

Explanation:

The given parameters are;

The height of the mountain over which the eagle is flying = 2700 m

The average density of air, ρₐ = 1.3 kg/m³

The atmospheric pressure at sea level = 76 cmHg = 0.76 mHg

The density of mercury, \(\rho _m\) = 13,600 kg/m³

The formula for pressure, p, is p = ρ·g·h

The pressure in the atmosphere = 13,600 × 0.76 × g = 10,336·g

The equivalent height of air is found as follows;

1.3 × g × h = 10,336·g

h = 10,336/1.3 = 7,950.769 meters

Therefore;

The pressure of the atmosphere at 2,700 meters, p₂₇₀₀ = (2,700/7,950.769) × 76 cm Hg

Which gives;

p₂₇₀₀ = 25.808 cmHg ≈ 25.8 cmHg.

Answer:

united states

Explanation:

give brainiest please

Answer:

most potential is someone in an airplane. second is position A, third is position c, fourth is position D, fifth is position B and least potential is a person standing on the ground.

Explanation:

hopefully you understand what I wrote

Answer: 0.49 is the actual answer your looking for

Explanation: :)

The spring constant of the spring is 25 N/m. Then the time period of oscillation is 0.49 seconds. Hence option c is correct.

The force applied on a spring is directly proportional to the displacement of the spring and can be written as:

f = - kx

where the proportionality constant k is called the spring constant.

From the graph the displacement of 0.02 m is resulted from the force of 0.5 N. then the spring constant = 0.5 /0.02 = 25 N/m

The relation between time period of oscillation and spring constant is written as:

T = 2π √(m/k)

m = 150 g = 0.15 Kg

then T = 2π √(0.15 kg/25 N/m) = 0.49 s

Therefore the time period of oscillation of the spring is 0.49 s.

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Answer: The first one is A and C

Explanation:

Answer:

2 is A

3 is C

Explanation:

The reason why two is a is think of it like this. atoms have to be combined together to make a molecule. So in other words you need letters to create a word.

3 is c because in a recipe you have to have the right proportions. Just like you have to have the right proportions of atoms to create a molecule.

Answer:

The system has parts that sense the amount of output, allows negative feedback to control a system

Explanation:

The theoretical Coefficient of Performance (COP) to cool the room A is 33.52.

Temperature in room A = T₁ = 18.6 oc

Temperature in room B = T₂ = 27.3 oc

To convert temperatures in Kelvin,

= T₁ = 18.6 + 273 =

= T₁ = 291.6 K

and,

=  T₂ = 27.3 + 273

=  T₂ = 300.3 K

The COP value to cool room A =

= COP = T₁ / (T₂ - T₁)

= COP = 291.6  / (300.3 - 291.6 )

= COP = 291.6 / 8.7

= COP = 33.52

The theoretical coefficient of performance to cool room A is 33.52 when the temperature of room A is 18.6 oc and that of room B is 27.3 oc.

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Answer:

F = 8840.7 N

Explanation:

The parameters given are:

Length L = 3 metres

Extension e = 3 × 3 = 9m

Force constant K = 982.3 Newton per metre​

From Hook's law,

Provided the elastic limit is not extended, the extension is directly proportional to the force applied.

That is,

F = Ke

Substitute all the parameters into the formula

F = 982.3 × 9

F = 8840.7 N

The correct answer is because of the balloon's electrostatic attraction to the wall caused. Different charges are drawn to one another.

What is electrostatic force between two charges?

The Coulomb's inverse-square law, sometimes known as Coulomb's law, is an experimental physical principle that measures the force exerted between two electrically charged particles that are stationary. Common names for the electric force between two charged objects at rest include electrostatic force and Coulomb force.

Hence, due  to the electrostatic force between the balloon and the wall. Opposite charges attract each other.

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Frequency or wavelength-based distribution of all electromagnetic radiation is known as electromagnetic spectrum.

The majority of celestial bodies emit many forms of electromagnetic radiation simultaneously. What they emit depends on a variety of factors, including how hot they are and what materials they are made of.

Different telescopes are used by astronomers to find various electromagnetic spectrum components. Only one region of the electromagnetic spectrum can be detected by each type of telescope.

At radio frequencies, light pollution is more severe than at visible wavelengths.

Light pollution, often known as artificial nighttime light, is the improper or excessive use of artificial outdoor light.

Different energies of photons have a range of wavelengths, some of which are inaccessible from the Earth's surface and need different methods of collection.

As the atmosphere distorts more strongly at shorter wavelengths, telescopes must adjust.

Modern telescopes use new technologies to work more effectively and making innovative telescope designs is a task that engineers and astronomers relish.

That’s why astronomers need different telescopes at different locations to observe across the electromagnetic spectrum.

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Answer:

force that skater exerts on the ground

Explanation:

Answer:

D

Explanation:

If we ignore certain factors, then the net force is 0N, because we have two equal but opposite forces (10N-10N).

The average velocity of ladybug crawling up the wall, v = 0.1 m/s.

To find average velocity using the formula,

v = dx / dt

where,

v is average velocity

dx is distance

dt is time

So, putting the values

We have,

v = 1m / 10s

v = 0.1 m/s

The difference between the change in position or displacement (x) and the time intervals (t) during which the displacement occurs is known as average velocity. Depending on how the displacement is displaced, the average velocity may be positive or negative. Meters per second (m/s or ms-1) is the standard international unit for average velocity.

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The speed οf the ball when it reaches the lοwest pοint οf the track, rοlling withοut slipping is √10/7g(R-r).

Speed is a scalar quantity that measures hοw fast an οbject is mοving, withοut cοnsidering its directiοn. Speed is typically expressed in units such as meters per secοnd (m/s), kilοmeters per hοur (km/h), οr miles per hοur (mph).

Given:

The radius οf the ball is r.

The radius οf the track is R.

The acceleratiοn due tο gravity is 9.18 m/s².

The mοment οf inertia οf the spherical ball can be expressed as:

I=2/5m/r²

It is given that the ball is rοlling withοut slipping. The speed οf the ball can be expressed as:

v=rω

At the lοwest pοsitiοn οf the track, the ball has bοth types οf speed, namely angular and linear speed.

The tοtal energy οf the ball in the vertical circle can be expressed as:

cEₜ= Eᵦ+ K.Eₜ+ K.Eᵣ

mgR= mgr+ (1/2)mv²+ (1/2)Iω²

mg(R-r)=  (1/2)mv²+ (1/2)* (2/5) mr²ω²

g(R-r)= (1/2)v²+ (1/5)v²

Here,

Eₜ is the tοtal energy οf the ball οn the track,

Eᵦ is the ball's energy in the vertical circle at the highest pοint,

K.Eₜ is the translatiοnal kinetic energy οf the ball,

K.Eᵣ is the rοtatiοnal kinetic energy οf the ball, and g is the acceleratiοn due tο gravity.

The abοve equatiοn can be further sοlved as:

cg(R-r)= (7/10)v²

v²= (10/7)g (R-r)

v= √(10/7)g (R-r)

Therefοre, the speed οf the ball when it reaches the lοwest pοint οf the track is √10/7g(R-r).

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A uniform steel beam is suspended from one end on the building site of a new skyscraper. The beam's length is 1.15 m if its back-and-forth motion has a period of 2.15 s.

A beam suspended from one end behaves like a simple pendulum. Simple pendulums are mechanical devices that exhibit periodic motion.

The formula for time period of simple pendulum if its length is 'l' is given by

\(T=2\pi \sqrt[]{\frac{l}{g} }\).

Here g is the acceleration due to gravity.

It is given that the time period of the beam is 2.15 s.

From the above formula, we can write that

\(l=\frac{T^{2}g }{4\pi ^{2} }\)

Here, we have acceleration due to gravity, g = 9.8 m/s²

π = 3.14

and T = 2.15 s

So, \(l=\frac{(2.15)(2.15)(9.8)}{4(3.14)(3.14)}\)

or, \(l=\frac{45.3}{39.4}\)

or, l = 1.15 m.

Hence, the length of the beam is 1.15 m.

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