If a car driving down the road doubles its speed what happens to its kinetic energy?

Answers

Answer 1

Answer:

Kinetic energy doubles


Related Questions

When measuring a condominium you should calculate ____ using _______ measurements.

Answers

When measuring a condominium you should calculate GLA using interior measurements.

What is condominium?A condominium is an individually owned home surrounded by other homes.What is GLA?

GLA stands for Gross Living Area

The GLA is the "total area of finished, above-grade residential space; computed by measuring the outer perimeter of the structure and comprises only finished, habitable, above-grade dwelling space," according to The Dictionary of Real Estate Appraisal.How is GLA calculated?To determine a property's above-grade gross living area, the appraiser should divide the external building dimensions by the number of floors. (The below-grade area is likewise subject to the measuring process)The appraiser should utilize interior perimeter unit dimensions to determine the gross living area for units in condo or co-op structures.Basements and garages, even those that are partially above-grade, are not to be counted in the number of rooms above grade.Pros of condominium:Lower-maintenance livingSense of securitySocializing opportunitiesAffordabilityAmenitiesCons of condominium:HOA rulesInvestment riskHigher interest ratesLack of privacyLimited outdoor spaceRising HOA feesSpecial assessmentsRestrictive rental policies

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The capacity for doing work that a body possesses because of its position or configuration is known as:____.

Answers

The capacity for doing work that a body possesses because of its position or configuration is known as Potential Energy.

What is Potential energy?Potential energy in physics is the energy that an item retains as a result of its position in relation to other objects, internal tensions, electric charge, or other elements.The gravitational potential energy of an object, which is based on its mass and distance from another object's center of mass.The elastic potential energy of an extended spring, and the electric potential energy of an electric charge in an electric field are examples of common types of potential energy.The joule, denoted by the letter J, is the energy unit in the International System of Units (SI).Potential energy is connected to forces that affect a body in such a way that their combined work is only dependent on the body's beginning and ultimate positions in space.At any point in space, these forces, also known as conservative forces, can be represented by vectors that are gradients of a particular scalar function known as potential.

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A particle moving in a straight line with uniform deceleration has a velocity of 40m/s at point P, 20m/s at point Q

and comes to rest at point R where QR=50m .Calculate the
1.Distance PQ
2.Time taken to cover PQ
3.Time taken to cover PR​

Answers

The distance between PQwill be 10,time taken to cover PQ will be 0.25sec and time taken to cover PR will be 3sec.

What is uniform deceleration?

Uniform deceleration is when velocity decrease by equal intervals of time .

Given ,

Velocity at P is 40 m/ s,

Velocity at Q is 20 m/ s

Distance between QR will be 50m.

let the whole distance between PR will be x,

so time taken of PQ, equating both times of PQ and QR we will get this,

x-50/40 = 50/ 20

after calculating ,

x = 60m , this the distance of whole straight line

60-50=. 10 m

the distance between PQ will be 10

2) time taken to cover PQ

. V= d/ t

 t= 0.25s

3) time taken to cover PR

20=60/ t

t= 3sec.

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1. PQ=150m.

2. PQ: [tex]t=5s[/tex]

3. QR: [tex]t=5s[/tex]

What is velocity?

The vector quantity velocity (v), denoted by the equation v = s/t, quantifies displacement (or change in position, s) over the change in time (t). Speed (or rate, r) is a scalar number, denoted by the equation r = d/t, that quantifies the distance traveled (d) over the change in time (t).

QR=50m.

[tex]V_{Q} (u)=20ms^{-1} ,V_{R} v[/tex]

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

[tex]0=20^{2} +2a*50[/tex]

100a=-400

[tex]a=-4ms^{-2}[/tex]

1. Distance PQ:

[tex]u_{p} (u)=40msx^{-1} , v_{Q (v)=20ms^{-1}[/tex]

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

[tex]20^{2} =40^{2} -2*4s[/tex]

400=1600-400

8s=1600-400

[tex]s=\frac{1200}{8} =150m[/tex]

PQ=150m

2.Time taken to cover PQ:

v=u+at

20=40-4t

4t=40-20

[tex]t=\frac{20}{4}=5s[/tex]

3. Time taken to cover PR​:

v=u+at

0=20-4t

[tex]t=\frac{20}{4}=5s[/tex]

1. PQ=150m.

2. PQ: [tex]t=5s[/tex]

3. QR: [tex]t=5s[/tex]

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Calculate the frequency of the green light emitted by a hydrogen atom with a wavelength of 486. 1 nm.

Answers

The frequency of the green light emitted by a hydrogen atom with a wavelength of 486. 1 nm will be 6.17 * [tex]10^{-14}[/tex] Hz

The wavelength of light is the distance between corresponding points in two adjacent light cycles, and the frequency of light is the number of cycles of light that pass a given point in one second.

Visible light falls in the range of the EM spectrum between infrared (IR) and ultraviolet (UV). It has frequencies of about 4 × 1014 to 8 × 1014 cycles per second, or hertz (Hz) and wavelengths of about 740 nanometers (nm) or 2.9 × 10−5 inches, to 380 nm (1.5 × 10−5 inches)

f = c/lambda

where

f = frequency of light = ?

lambda = wavelength of light =  486. 1 nm = 486.1 * [tex]10^{-9}[/tex] m

c = speed of light = 3 * [tex]10^{8}[/tex] m/s

f = 3 * [tex]10^{8}[/tex]  / 486.1 * [tex]10^{-9}[/tex] = 6.17 * [tex]10^{-14}[/tex] Hz

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In a similar rolling race (no slipping), the two objects are 2 solid cylinders of the same mass but different radii. which reaches the bottom first?

Answers

The solid cylinder reaches the bottom first.

A (solid) cylinder is a solid that has two parallel planes and a cylindrical surface surrounding it. An element of the cylinder is a line segment that is determined by an element of the cylindrical surface between two parallel planes. A cylinder's components are all the same length. The material's velocity would be higher if the moment of inertia was lower and the radius of gyration k was smaller. In comparison to a hollow cylinder with k as 1, a solid cylinder with k as 1/2 will move at a faster speed. Their energies at both levels, including potential energy and energy lost through friction, would stay the same because they had the same mass and radius.

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A solid cylinder and a hollow cylinder of the same mass and radius, both initially at rest, roll down the same inclined plane without slipping. Choose the correct options.

The solid cylinder reaches the bottom first.

A solid object will always roll down the ramp faster than a hollow object of the same shape regardless of their exact mass or diameter.

The solid cylinder has a lower moment of inertia than the hollow one does. Although they have the same mass, all the hollow cylinder's mass is concentrated around its outer edge so its moment of inertia is higher.

The velocity would be greater for the material with radius of gyration k is lower of for which the moment of inertia is lower. Solid cylinder with k as 1/2 will have greater velocity as compared to hollow cylinder which has k as 1. As they have same mass and radius their energies at both the levels would remains same including the potential energy and energy lost due to friction.

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Given two different resistances, how does the rate of joule heating in them differ if they are connected to a fixed voltage source in series and in parallel?

Answers

In series combination less rate of joule hating should be observed as compared to when connected in parallel combination .

Joule heating, also known as resistive, resistance, or Ohmic heating, is the process by which the passage of an electric current through a conductor produces heat.

Joule's first law states that the power of heating generated by an electrical conductor equals the product of its resistance and the square of the current:

When two or more resistors are connected end to end consecutively, they are said to be connected in series combination. The combined resistance of any number of resistances connected in series is equal to the sum of the individual resistances.

When two or more resistances are connected between the same two points, they are said to be connected in parallel combination. The reciprocal of the combined resistance of a number of resistances connected in parallel is equal to the sum of the reciprocals of all the individual resistances.

Rate of joule heating can be calculated by the formula

Power = [tex]V^{2}[/tex] / R

V = voltage

R = resistance

When both are connected in series than their equivalent resistance will be more as compared to when they are connected in parallel.

Power is inversely related to resistance , if voltage is constant

In series combination less rate of joule hating should be observed as compared to when connected in parallel

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What is a supply chain designed to optimize both forward and reverse flows?
a. open-loop supply chain
b. closed-loop supply chain
c. bullwhip-loop supply chain
d. reverse-loop supply chain

Answers

The correct option is b. closed-loop supply chain

Closed-loop supply chain is designed to optimize both forward and reverse flows.

What is closed-loop supply chain?

Businesses recycle their waste volume to make new products in such a closed-loop supply chain. This method of resource conservation and energy conservation is sustainable.

Some characteristics of closed-loop supply chain are-

Although there are many natural resources on the planet, such as freshwater and oil, they are limited and will eventually run out. Fortunately, numerous governments all across the world have created and put into effect ways to lessen resource waste.Likewise, companies can contribute to the preservation of natural resources by implementing the closed-loop supply chain (CLSC). The appeal of a CLSC or negligible supply chain is that it centers on material reuse, composting, and recycling. As a result, the closed-loop supply chain encourages manufacturers to come up with creative uses for End-of-Life (EOL) products rather than disposing of them in landfills.

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A proton travels with a speed of 8. 34×10^5 m/s at an angle of 32. 3° with the direction of a magnetic field. the field exerts a force of 3. 00×10^−17 n on the proton. What is the strength of the field?

Answers

Magnetic field strength of the field is  4.2 × [tex]10^{-4}[/tex] T

What is Magnetic Field ?

The region of space where magnetic force is experienced is known as magnetic field.

The force on a particle of charge q moving at speed v at an angle Ф to a uniform magnetic field of flux density B is given as

F = BqvsinФ

Given that a proton travels with a speed of 8. 34×10^5 m/s at an angle of 32. 3° with the direction of a magnetic field. the field exerts a force of 3. 00×10^−17 N on the proton. What is the strength of the field?

The parameters are;

Force F = 3.0 × 10^−17 NSpeed V = 8.34 × 10^5 m/s Angle Ф =  32. 3°Magnetic field strength B = ? Proton charge = 1.6 x [tex]10^{-19}[/tex] C

Substitute all the parameters into the formula

F = BqvsinФ

3.0 × [tex]10^{-17}[/tex] = ( 1.6 x [tex]10^{-19}[/tex]  x 8.34 x [tex]10^{5}[/tex] x sin 32.3 ) B

3.0 × [tex]10^{-17}[/tex]  = 7.13 × [tex]10^{-14}[/tex] B

Make B the subject of formula

B = 3.0 × [tex]10^{-17}[/tex] / 7.13 × [tex]10^{-14}[/tex]

B = 4.2 × [tex]10^{-4}[/tex] T

Therefore, Magnetic field strength of the field is  4.2 × [tex]10^{-4}[/tex] T

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A stone that is thrown vertically upwards was having a velocity of 15m/s after reaches 2/3 of its maximum height. What is the maximum height that can be reached by the stone?

A. 9.8m
B. 11.5m
C. 22.9m
D. 34.4m​

Answers

The correct answer is option B. The maximum height that can be reached by the stone is determined as 11.5 m.

Maximum height attained by the stone

The maximum height attained by the stone when it is a 2/3 of its total height is calculated as follows;

v² = u² - 2gh

where;

v is final velocity at maximum height, v = 0u is initial velocityg is acceleration due to gravity

0 =  u² - 2gh

2gh =  u²

h =  u²/2g

h = (15²)/(2 x 9.8)

h = 11.48 m

h = 11.5 m

Thus, the maximum height that can be reached by the stone is determined as 11.5 m

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A 7.2 magnitude earthquake, with an epicenter in Northern Mexico, was felt over 100 miles away in Southern California because waves generated by earthquakes
A
do not require a medium to propagate.

B
travel away from the epicenter with no interference.

C
carry energy through Earth's crust.

D
can be measured on a Richter scale.

Answers

Answer:

B

because waves generated

A lorenz curve represents the cumulative percentage of total income received along the ________ and the cumulative share of population along the ________

Answers

A lorenz curve represents the cumulative percentage of total income received along the horizontal axis and the cumulative share of population along the vertical axis.

The distribution of the cumulative percent of occurrences by the cumulative percent of population is shown graphically by the Lorenz Curve. By expanding the neighbourhood income quintile group, the horizontal axis (x-axis) of the curve shows the cumulative percent of persons in the population, and the vertical axis (y-axis) shows the cumulative percent of events in the population.

The Lorenz curve can be described as the proportion of the population that the neighbourhood income quintile represents holding the proportion of population events.

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a girl standing on her heel exert more pressure on the ground than an elephant standing flat on its feet. Give reasons​

Answers

Answer:

The pressure exerted by a women wearing shoes with pointed heels is much greater than what an elephant with one foot can exert on ground. This because of lesser area of contact of pointed heels.

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The development and use of alternative energy source is very necessary in present day world. Explain this statement.​

Answers

Answer:

In today's world pollution is very high so alternative energy such as solar energy help us to make pollution free world. So it is necessary to use alternative energy.

Which statement about nuclear fusion is correct? A. Two hydrogen electrons become protons during fusion. B. Helium nuclei can fuse to form elements such as nitrogen.
C. The fusion reaction lasts for several hundred years. D. Large nuclei break apart to form smaller nuclei.

Answers

Answer:

A is the answer

Explanation:

Yes, Two hydrogen electrons become protons during fusion.

By far, the most common fusion reaction in nature combines two hydrogen atoms to make a helium atom.

Answer:

B

Explanation:

A   no  

B   Yes ....can fuse all the way up to making Iron

C no

D no .... the opposite

What is the free energy of activation of a one-step reaction? how is it qualitatively related to the rate constant of the reaction?

Answers

The difference in free energy between the reactants and the transition state is the free energy of activation of a one-step reaction. The rate constant falls as the activation free energy rises.What is free energy?A notion that is helpful in engineering and research is the thermodynamics of chemical or thermal processes.For instance, the energy required for a battery to perform its maximum electrical work while discharging.What is rate constant of reaction?The chemical kinetics rate law, which connects the molar concentration of reactants to reaction rate, uses the rate constant as a proportionality factor. The letter K in an equation designates it, which is also referred to as the reaction rate constant or reaction rate coefficient.

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What happens to heat energy when it is not increasing the temperature of the substance in the beaker? use your heating curve to explain your answer

Answers

When heat energy is not increasing the temperature of the substance in the beaker, the heating curve will start to increase and then flatten as it melts and is a solid with liquid.

What is Heating curve?

This can be referred to as a type of graph which shows the relationship between the heating system supply temperature and the outside air temperature.

The heat energy not being able to increase the temperature is the reason why there will be solid present in the liquid. This is as a result of it not reaching its required melting point which is why all the substances aren't melted and is therefore the most appropriate choice.

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After traveling for 6.0 seconds, a runner reaches a speed of 12 m/s after starting
from rest. What is the runner's acceleration?
A. 2 m/s²
OB. 72 m/s²
C..5 m/s²
D. 6 m/s²

Answers

Answer:

A

Explanation:

accel =  Δv /  Δ t  =  12/6 = 2 m/s^2

A ball is gently dropped from a height of 20 m onto a hard surface where it make an elas 1) Show that the speed of the ball just before hits the ground is 20m/s (g=10m/s2)
2) Why isn’t the accelera 3) Use axes below to sketch a graph of how the velocity of the ball varies with several bounces

Answers

Answer:

20 m/s

Explanation:

Use the position/displacement formula to find out how long the ball is in the air:

(distance) = (initial velocity)*(time) + (1/2)*(acceleration)*(time)^2

20 = 0*t + 1/2*10*t^2

t^2 = 4

t = 2 seconds

Use the velocity formula:

(final velocity) = (initial velocity) + (acceleration)*(time)

Vf = 0 + 10*2

Vf = 20 m/s

Peripheral vision is the sharpness of your eyesight that is very important in driving a vehicle? true or false?

Answers

True.

Peripheral vision is very important in driving a vehicle.

What is peripheral vision?

Peripheral vision is the area of your field of vision that is not directly in front of you. You can keep your eyes on what's in front of you while using peripheral vision to see when other automobiles are passing you. For example, peripheral vision can tell you when it's safe to cross a street, when a pedestrian is attempting to cross, or when you need to go to the car wash because a bird just peed on your window.

Peripheral vision works in conjunction with central vision to help you make informed driving decisions. You can spot potential dangers before they enter your field of vision by using your peripheral vision.

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An immersion heater has a power rating of 1500 watts. it is used to heat water for coffee. how long (in minutes) should it take to bring 0. 7 l of water from room temperature (20°c) to 80°c?

Answers

1.96 minutes long should it take to bring 0. 7 l of water from room temperature (20°c) to 80°c.

To find the answer, we have to know about the heat energy.

How to find the time taken to raise the temperature?It is given that,

                    [tex]Power,P=1500W\\Volumw, V=0.7L\\T_1=20^0C \\T_2=80^0C[/tex]

We have to find mass of water first, and the expression is,

                   [tex]m=\rho V=1kg/L*0.7L=0.7kg[/tex]

Heat energy required to raise the temperature from 20 to 80 degree Celsius is,

                    [tex]Q=mc\Delta T=0.7*4182(80-20)\\Q=1.76*10^5J[/tex]

where, c equals to 4182J/kg°C.

This energy can be related with power and then the time will be,

                     [tex]t=\frac{E}{P} =\frac{1.76*10^5}{1500} =117.3s=1.96minutes.[/tex]

Thus, we can conclude that, 1.96 minutes long should it take to bring 0. 7 l of water from room temperature (20°c) to 80°c.

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What is the total rate at which electrical energy is dissipated in the 5. 0 ω resistor?.

Answers

Total rate at which electrical energy is dissipated

is 5W

Given:

Resistance = 5 ohm

To Find:

total rate at which electrical energy is dissipated

Solution:

The power dissipated in a resistor can be obtained by Ohm's law as P=VXI, where V = voltage and I = current. So, energy dissipated is given by P x t (time)

P = (I)^2R

Let's assume current given is 1

P = 1 x 5

P = 5 W

So, total rate at which electrical energy is dissipated is 5W

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Examine Figure 1. During the process of beta decay, which statement correctly compares the parent nucleus and the daughter nucleus?

A
The parent has a different mass number than the daughter.

B
The parent has a different atomic number than the daughter.

C
The parent has the same number of neutrons as the daughter.

D
The parent has the same number of electrons as the daughter.

Answers

Beta decay forms a daughter nucleus with a different atomic number than the parent nucleus. The correct answer is option B.

A nucleus loses an electron when it emits the beta particles. The parent and daughter nuclei share the same atomic mass because the mass of an electron is so much less than that of a proton or neutron. The offspring nucleus has an atomic number that is one higher than the parent nucleus.

There are mainly two types of beta decay: beta plus (positron decay) and beta minus (electron decay). The daughter atomic number reduces by one after beta plus decay (the nucleus loses one positive charge) and rises by one after beta minus decay (the nucleus loses one negative charge).

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The index of refraction of the core of a typical fiber optic is ncore = 1. 46; the cladding has nclad = 1. 4. calculate the critical angles for the total internal reflection icrit and crit

Answers

critical angle = [tex]i_{cr}[/tex] = 73.7°

total internal reflection = [tex]\alpha[/tex]cr = 54.58°

Given:

refractive index of core, [tex]n_{core}[/tex] = 1.46

refractive index of clad, [tex]n_{clad}[/tex] = 1.4

The incidence angle that causes the refraction angle to be equal to that at that angle of incidence is known as the critical angle.

The incidence angle needs to be greater than the critical angle for Total Internal Reflection to happen.

Now, we know that the critical angle = θcr is given by:

sinθcr = [tex]\frac{n_{clad} }{n_{core} }[/tex]

θcr = [tex]sin^{-1}[/tex] ([tex]\frac{n_{clad} }{n_{core} }[/tex])

θcr = [tex]sin^{-1}[/tex] ([tex]\frac{1.4}{1.46}[/tex])

= [tex]sin^{-1}[/tex](0.96)

=73.7° = [tex]i_{cr}[/tex]

Now for [tex]\alpha[/tex]cr:

[tex]sini_{cr}[/tex]/[tex]sin\alpha _{cr}[/tex] = 1/[tex]n_{core}[/tex]

[tex]sin\alpha _{cr}[/tex] = sin(90° - 73.7°) × 1.46

[tex]sin\alpha _{cr}[/tex] = sin(16.3°) × 1.46

          =-0.558 × 1.46

          =-0.815

[tex]\alpha _{cr}[/tex] = [tex]sin^{-1}[/tex](0.815)

      = 54.58°

What is total internal reflection?full refraction of a light ray from the surrounding surfaces back into a medium like glass or water. If the incidence angle exceeds a specific limitation angle known as the critical angle, the phenomenon will manifest.

Why is total internal reflection termed that?

Total internal reflection means that none of the light that might conceivably travel away from this surface is refracted and that all of it is reflected.

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If mass (M), Velocity (V) and length (L) are considered as fundamental quantities in certain system of unit. Find the dimensional formula for force.

Answers

Answer:

Explanation:

MLT^-2

.....

Find the equivalent resistance of this
circuit.
R₁
www
960 92
I
R₂
www
640 Ω
Reg?
Ra
W
180

Answers

Explanation:

1/R = 1/R1 + 1/ R2

1/R = 1/960 + 1/640

1/R = 5 / 1920

R = 384 ohm

So , Req = 384 + R3

Req = 384 + 180

Req = 564 ohm

[tex]\huge\red{A}\pink{N}\orange{S}{W}\blue{E}\green{R} [/tex]

Req = 564 ohm

Driving safely at night requires seeing well not only in low light conditions, but also being able to see low contrast

Answers

Answer:

True

Explanation:

Driving safely at night requires seeing well not only under low light, but also requires drivers to see low-contrast objects.

A charge q = -10 µc experiences an electrostatic force of 35 mn to the left. What is the magnitude and direction of the electric field?

Answers

A charge q = -10 µc experiences an electrostatic force of 35 mn to the left.

The magnitude of electric field will be = 35 * [tex]10^{2}[/tex] N/C

Direction of the electric field will be from left to right

The force exerted by a charged body on another charged or uncharged body is called electrostatic force. This force is known as non-contact force because these forces comes into play even when the bodies are not in contact with each other.

Electric field, an electric property associated with each point in space when charge is present in any form. The magnitude and direction of the electric field are expressed by the value of E, called electric field strength or electric field intensity or simply the electric field.

given

q ( charge ) = -10 µc

Electrostatic force  = 35 mN

Electric field = Force on charge  / charge

                    = 35 * [tex]10^{-3}[/tex] / (-10 * [tex]10^{-6}[/tex])

                    = - 35 * [tex]10^{2}[/tex] N/C

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Are there components of the velocity that are not determined by the measurement of the force?.

Answers

Are there components of the velocity that are not determined by the measurement of the force?. Yes

What are components of velocity?

Due to the possibility of velocities pointing diagonally, two-dimensional motion is more complicated than one-dimensional motion. A baseball, for instance, could be going diagonally while also moving both horizontally and vertically. To make our calculations simpler, we divide the velocity vector of the baseball into two independent horizontal start subscript and end subscript directions.

It is challenging to attempt to solve for both the horizontal and vertical directions of a baseball in a single equation; it is preferable to use a divide-and-conquer strategy.

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One or more objects may be created from a(n) ________.
a. field
b. instance
c. method
d. class

Answers

The answer is (d) class

One or more objects may be created from a class.

Class objects normally have methods that perform useful operations on their data.

What is class?

A class in object-oriented programming is a template specification of the method s and variables in a certain type of object. As a result, an object is a specific instance of a class that holds real values rather than variables. The class is a key concept in object-oriented programming.You may also construct a class object and use it in another class. This is frequently used to improve class structure (one class has all of the properties and methods, while the other class contains the main() method (code to be run).

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One or more objects may be created from a class.

Class objects contains methods which perform useful operations on their data.

A class in object-oriented programming refers to a template specification of the methods and variables in a a type of object.

An object is a specific instance of a class that holds real values rather than variables.

The class is a key concept in object-oriented programming.

We may also construct a class object and use it in another class. It is frequently used to improve the structure of class.

Hence, one or more objects may be created from a class.

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An airplane flies with a velocity of 55.0 m/s [35o N of W] with respect to the air (this is known as air speed). If the velocity of the airplane according to an observer on the ground is 40.0 m/s [53o N of W], what was the wind velocity?

Answers

The wind velocity of the plane in discuss can be evaluated by means of the air velocity if the plane and the observed velocity is; 20.98m/s.

What is the wind velocity of the according to the observed velocity?

It follows from the task content that the air velocity of the plane in discuss is; 55.0 m/s [35o N of W] while the observed velocity is; 40.0 m/s [53o N of W].

Hence, the components of both velocities can be evaluated as follows;

55.0 m/s [35o N of W] = (55cos35, 55sin35) = (45.05, 31.55)

40.0 m/s [53o N of W] = (24.07, 31.95)

Hence, the wind velocity can then be evaluated as follows;

Wind velocity = (24.07 - 45.05, 31.95- 31.55)

Wind velocity = (-20.98, 0.40)

The wind velocity would therefore have a magnitude of; √(-20.98)² + (0.40)²

= 20.98 m/s.

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