A line that intersects two or more lines in a plane at different points is called a.

The correct option is "they makes the work easier".

Machines make work easier even if they still require the same amount of work to be done.

We humans get tired because we do not have constant source of energy for the work to be done.

Machines have a constant source of energy such as electricity.

Humans too will work at the same rate without getting tired if they are also provided with constant energy.

What is a Machine?

A machine is a physical system that use power to exert forces, control motion, and perform an action. The phrase is widely used to describe man-made systems that utilize engines or motors, in addition to naturally existing biological macromolecules like molecular machines. Humans, animals, and unnatural forces like wind and water can all propel machines.

Chemical, thermal, or electricity may also be used to propel them. The actuator input of these machines is often shaped by a set of mechanisms to create a certain set of output forces and movements. They may also have mechanical components that monitor activity and plan movement. These components are typically referred to as computers and sensors.

Therefore, the machines help in making the work easier.

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When starting and ending at rest and stretching this cuff from x = 0 to x = l, the work involved is:. al²÷2

A force's output is defined as the product of the force's component acting in the displacement's direction and its magnitude. Formula. The following formula can be used to determine work: multiply force by distance traveled in the direction of force. W = F × d.

In our daily lives, we see many examples of work is being done. Several examples include a student carrying a bag full of books off his shoulder or back, a horse dragging a plow through a field, a father moving a supermarket cart at a mall, and many more.

Stretching the rubber band from x = 0 to x = L requires work.

[tex]W = \int\limits^L_0 {F} \, dx = \int\limits^L_0 {a} \, dx \\W = \frac{aL}{2}[/tex]

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The total energy of the international space station orbiting the earth is -μ/2a.

The total energy is the sum of kinetic energy and potential energy.

E = [tex]E_{k}[/tex] + [tex]E_{p}[/tex]

   = v²/2 - μ/r

   = -1/2 μ²/ h² (1-e²)

    = -μ/2a

Here v = relative orbital velocity

r = orbital distance between the bodies

μ = G(m1 + m2) = the sum of the standard gravitational parameters of the bodies.

h = specific relative angular momentum in the sense of relative angular momentum.

e = orbital eccentricity

a = semi-major axis

Therefore we get the total energy is -μ/ 2a.

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What is magnitude?

Magnitude can be used in a variety of contexts. Among them are:

An earthquake's size is measured in terms of its length, breadth, and width. It is calculated based on the earthquake's actual size.

However, A single magnitude is thought to exist for an earthquake.

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No, the bag does not hold in case of the maximum force a grocery sack can withstand and not rip is 250 n. if 20.0 kg of groceries are lifted from the floor to the table with an acceleration of 5.0 m/s^2.

The second law of motion of Newton describes how things behave when all external forces are not equal. The second rule states that an object's acceleration depends on both its mass and the net force acting on it. The acceleration of an item is defined by the net force acting on it and is inversely related to its mass.

Given,

Fₓ = 250

m = 20kg

[tex]a_{gravity}[/tex] = 9.81 m/s2

[tex]a_{pull}[/tex] = 5 m/s2

Fₙ = m(a+g)

Fₙ = 20 kg ( 5 m/s2 + 9.81 m/s2)

Fₙ = 20 (14.81)

Fₙ = 296.2

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When it is given that that star has 4 times the sun's mass then main sequence lifetime is calculated as: 312.5 * 10 ^6 million years.

A continuous and distinctive band of stars that appear on plots of stellar color versus brightness known as the main sequence. The color-magnitude plots are known as Hertzsprung–Russell diagrams.

The outer layers of star expand while the core is shrinking. As the expansion continues, the luminosity also increase.

Given mass of star is 4 times the sun, then

Main sequence lifetime is calculated as:

= 10^10 / 4^2.5

= 312500000

= 312.5 * 10 ^6 million years.

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The magnitude of the rock's acceleration a' is less on the descent than on the ascent.

Solution:

mass = m, angle of the ramp = A, friction force = f

when it is going up, net force F = mgsinA + f

acceleration a = F/m = gsinA + f/m

when it is going down, net force F' = mgsinA - f

acceleration a' = F'/m = gsinA - f/m

so a' < a

The magnitude of the rock's acceleration a' is less on the descent than on the ascent.

Push the blocks to slide up the ramp. After the block reaches the highest point, it slides down, but the magnitude of the acceleration is less on the descent than on the rise. Friction and gravity work together. Blocks decelerate rapidly. Descent Friction and gravity work in opposite directions. The block accelerates slowly. It doesn't take long to slide.

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The lowest frequency of the standing waves is 8.37 Hz.

The lowest frequency of standing waves on a wire depends on the length of the wire and wave velocity. The speed of the waves can be calculated by using this formula

v = √( F . L / m )

where v is the speed of the waves, F is wire tension, L is the length of the wire and m is the mass of the wire.

The harmonic frequency of waves should follow

f = (n + 1) v / 2L

where f is the harmonic frequency, n is the order number

From the question above, the given parameters are

L = 10.5 m

m = 90 g = 0.09 kg

F = 265 N

n = 0

Find the speed of waves

v = √( F . L / m )

v = √( 265 . 10.5 / 0.09 )

v = 175.83 m/s

Find the lowest frequency

f = (n + 1) v / 2L

f = (0 + 1) 175.83 / 2 . 10.5

f = 8.37 Hz

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Answer:

Explanation:

R₁ = 22 Ω

R₂ = 4.5 Ω

U = 45  V

Circuit resistance:

R = R₁ + R₂ = 22 + 4.5 = 26.5 Ω

Circuit current:

I = I₁ = I₂ = U / R = 45 / 26.5 ≈ 1.7 А

Lamp voltages:

U₁ = I₁·R₁ = 1.7·22 ≈ 37 V

U₂ = I₂·R₂ = 1.7·4.5 ≈ 8 V

Power:

P₁ = U₁·I₁ = 37·1.7 ≈ 63 W

P₂ = U₂·I₂ = 8·1.7 ≈ 14 W

P = U·I = 45·1.7 ≈ 77 W

The force is needed to make an 8kg object accelerate on a surface with a frictional force of 2.1n is  27.7 Newtons.

F = m x a

where

F = force exerted

m = mass of the object

a= the acceleration

m = 8 kg

a = 3.2m/s²

F = 8 x  3.2 = 25.6 N

So, net force required to overcome this friction and accelerate the object  =  25.6 + 2.1 = 27.7 Newtons

The given question is incomplete. complete question is :

how much force is needed to make an 8kg object accelerate at a rate of 3.2m/s²  on a surface with a frictional force of 2.1n.

The force is needed to make an 8kg object accelerate on a surface with a frictional force of 2.1n is  27.7 Newtons.

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The tension force on the string with a ball of mass 3.56 kg attached to it is 35 N.

Tension force is defined as the force transmitted through a rope, string or wire when pulled by forces acting from opposite sides.

To calculate the tension force in the string, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the tension force on the string is 35 N.

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109.539 yards far has the rocket traveled horizontally (since it was launched) at this point in time.

In arithmetic, the slope or gradient of a line is quite a number that describes each path and the steepness of the road. The slope is frequently denoted through the letter m; there is no clear answer to the question of why the letter m is used for slope, however its earliest use in English appears in O'Brien (1844)who wrote the equation of an instant line as "y = MX + b" and it could also be discovered in Todhunter (1888) who wrote it as "y = MX + c".

This generalization of the idea of the slope allows very complicated buildings to be planned and built that pass nicely past static systems which might be either horizontals or verticals but can change in time, flow in curves, and alternate depending on the rate of alternate different factors. Thereby, the simple concept of the slope will become one of the fundamental basis of the current world in phrases of each era and the built surroundings. The slope of a line within the aircraft containing the x and y axes is normally represented via the letter m and is defined because the change inside the y coordinate is divided through the corresponding exchange within the x coordinate, between distinct factors on the road.

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The angular speed of the tires with 52.2 cm diameter about their axles if the automobile is traveling at 60.5 km/h is 64.65 rad / s

v = r ω

v = Linear / Tangential velocity

r = Radius

ω = Angular velocity

v = 60.5 km / h = 16.81 m / s

r = 52.2 / 2 cm = 26.1 cm

r = 0.26 m

ω = v / r

ω = 16.81 / 0.26

ω = 64.65 rad / s

Therefore, the angular speed of the tires about their axles is 64.65 rad / s

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The temperature patterns under low emissions and high emissions differ from the medium emissions model by having different temperature rise.

A temperature pattern describes the temperature of  a place in Earth. It is highly influenced by the strength of the sun. The strength of the sun is highly dependent upon how high it rises in the sky during the day. It is also influenced by the emissions in the area which is responsible for global warming.

As the name suggests low emission model has lower emission, high emission model has high emission and medium emission model will have medium emission. As emission increase, the temperature will also increase. So there will be different temperature patterns in all these models.

Therefore, the temperature patterns under low emissions and high emissions differ from the medium emissions model.

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Answer:

NaCl (Sodium Chloride)

Explanation:

This is the answer

The ability of Torricelli's hypothesis about atmospheric pressure to suggest the design of the barometer is an illustration of Fruitfulness

A barometer is a scientific instrument used to measure the air pressure in a certain environment. The atmospheric pressure measured is also known as barometric pressure. The pressure is measured in terms of atmosphere ( atm ) or bars. One bar / atm = 100 KPa

A glass tube closed at one end is submerged in a bowl filled with mercury and raised the tube but not above the mercury surface. The weight of the mercury pulled it down and left a partial vacuum at the closed end. This proved that gas has mass by creating pressure on things around it.  

Therefore, the ability of Torricelli's hypothesis about atmospheric pressure to suggest the design of the barometer is an illustration of Fruitfulness

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Answer:

The difference between ohmic and non-ohmic conductor is that an Ohmic conductors have linear relationship between voltage and current, whereas the non-Ohmic conductors do not have linear relationship between voltage and current. The conductor is whether ohmic or non ohmic can be verified with Ohm's law.

Explanation:

Work is done on the bobsled team while they stop is 13,176 Nm

Work, in physics, degree of electricity switch that happens when an item is moved over a distance with the aid of an outside pressure at the least a part of that is carried out in the route of the displacement.

Calculation:-

mass = 488 Kg

speed = 54 m/s

a = 3.1 m/s²

displacement

V² = U² -  2as

0 = 54 - 2× 3.1 S

S = 54/6.2

  = 8.71 m

Work done = force × displacement

                    = mass × acceleration × displacement

                    = 488 × 3.1 × 8.71

                    = 13,176 Nm

The work done via a pressure is the made of the displacement and the issue of the implemented force of the item within the path of displacement. while we push a block with a little force. The body moves with some acceleration, and work is executed. The paintings finished by pressure are defined to be manufactured from a thing of the pressure within the direction of the displacement and the significance of this displacement.

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An electric motor is a device used to convert electricity into mechanical energy—opposite to an electric generator.

(A) The weight of the motor should be considered as the 1000 N.

(B) It should be located like 1.2 m from the 400 N force.

Since

length of the board (R) = 2 m

force at one end (F1) = 400 N

force at other end (F2) = 600 N

Here we assume following things

let the distance of force F1 from the motor be = r

let the distance of force F2 from the motor be = r

So, r + r' = 2 m

a. here the weight should be

= 600 + 400

= 1000 N

b.

Since

F1 x r = F2 x r'

So,

here we have to recall that r + r' = 2

r' = 2 - r

now substituting r' = 2 -r into the equation

F1 x r = F2 x (2 - r)

So,

400r = 600(2-r)

400r = 1200 - 600r

400r + 600r = 1200

1000r = 1200

r = 1200/1000

r = 1.2 m

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Because of how large Earth is, an ant's exploration of it makes it appear flat. It appears that the Big Bang theory explains how components were created in the first few minutes following the Big Bang.

Contrary to popular belief, Earth doesn't provide an official international name. The word "Terra" is merely a common misunderstanding of the scientific name for the planet. "Earth" is the commonly used English name for the planet, particularly in scientific contexts.

A planet like the Earth revolves around a star called the sun. A star is typically understood to be a mass of gas that is sufficiently massive and dense to enable nuclear fusion to occur at its core.

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Answer:

Explanation:

Given:

ρ = 1 030 kg/m³ - Salt water density

h = 120.0 m - Submergence depth of the submarine

_____________________________

p - ?

Pressure:

p = ρ·g·h

p = 1030·9.8·120.0 ≈ 12·10⁶ Pa    or  p = 12 MPa

Competition from newly industrializing countries has also been blamed for rising unemployment in the OECD region.

This paper demonstrates that the widely accepted supply shock and real wage gap explanation of unemployment rate increases since 1973 has only limited empirical support.

The causes of unemployment are best understood by focusing on conflicts of interest in Western democracies, the distribution of power resources among major interest groups, and conflict strategies. Given economic constraints, unemployment appears to be the labor market manifestation of distributive conflict, with inflation and industrial disputes as alternatives.

Strategic action by government elites and long-term patterns in conflict resolution are major factors behind the two major transformations of Western unemployment levels – the introduction of full employment in the immediate postwar period and the return to high unemployment since 1973 – as well as variations in unemployment among the eighteen Western democracies.

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The potential energy of the wooden log was converted into the kinetic energy of heat and light.

Potential energy is energy that is saved or conserved in an object or substance. This saved energy is based totally on the location, association or country of the object or substance. You could consider it as energy that has the potential to do work.

An item can store energy as the result of its function. for instance, the heavy ball of a demolition machine is storing power when it is held at an accelerated function. This saved electricity of role is known as capability electricity. similarly, a drawn bow is able to keep energy as the end result of its role.

Potential energy refers to the saved electricity within an item that exists due to the item's function, kingdom, or association. It's one of the  number one types of energy the opposite is kinetic energy. The saved electricity is released when the position, kingdom, or association of the object changes.

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√10 N Force is the resultant Force in the given diagram.

3N towards north

1 N towards West

Resultant= √3²+√1²

Resultant= √10 Newton

Every action that attempts to maintain, modify, or change the motion of a body is referred to as a force in mechanics. In his Principia Mathematica, Isaac Newton frequently used his three laws of motion to demonstrate the concept of force (1687).

According to Newton's first law, a body will remain in either its resting or equally moving condition along a straight route in the absence of an external force. The second law states that when an external force acts on a body, the body accelerates (changing velocity) in the direction of the force.

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Double insulated is a term used to describe an electrical product designed so that a single ground fault cannot cause a dangerous electrical shock through any exposed parts of the products that can be touched by an electrician.

The number one reason to test insulation is to ensure public and personal safety. By performing high voltage testing between the dead life and grounded conductors the possibility of life-threatening short circuits or ground faults can be eliminated.

Care should always be taken not to measure the insulation resistance when the temperature is below the dew point. This is the easiest method. Apply the test voltage briefly and record the measured insulation resistance at this point. Network connections are generally of two types: peer-to-peer and network-sharing environments.

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The moon orbiting the earth and Gravity pulls skydiver down towards the surface of the earth from an airplane are examples of a non-contact force

Non-contact forces are forces that act between two objects that are not physically touching each other.

That means that there is no contact but there exist force between them .The moon orbiting the earth due to gravitational force between both the bodies , this is a non contact force . Because moon is in not in contact with the earth , still both the bodies are exerting force on each other

Also Gravity pulls skydiver down towards the surface of the earth from an airplane is also an example of non contact force because there is no contact between skydiver and earth , still due to earth's gravitational force , it is been attracted towards the ground

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Although air makes up more than half of a marshmallow's volume, sugar is the main ingredient. Gelatin or another ingredient that gels is beaten with a hot sugary syrup to create them.

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The light will continue to travel at 34.8° with the normal. The result is obtained by using the Snell's Law.

The Snell's Law is a formula to describe the relationship between the angles of incidence and refraction when a light passes through two medias. It can be expressed as

ni / nr = sin θr / sin θi

Where

Note that the angles are measured from the normal line.

The critical angle can be expressed as

sin θc = ni / nr

If the critical angle is 53.7° and the light enters the substance from air at 45.0° with the normal, what angle with the normal will it continue to travel?

We can combine the above two formulas to find the refracted angle.

ni / nr = sin θr / sin θi

sin θc = sin θr / sin θi

sin 53.7° = sin θr / sin 45°

0.806 = sin θr / 0.707

sin θr = 0.707 × 0.806

sin θr = 0.570

θr = 34.8°

Hence, the light will continue to travel at 34.8° with the normal.

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The wavelength of light will the first-order dark fringe is 1.205 μm.

Calculation:-

We know that, for the 1st order dark fringe, we have

y(dark,0 )= ( 0 + 1/2)*λ*L/d

0.00484 m =( 0.5*λ*3 ) /0.00037376

= λ =( 0.00484*0.00037376)/(0.5*3)

= λ = 1205*10^-9 m

= 1.205 μm

The wavelength of light determines its color and the wavelength of sound determines its pitch. Wavelength is the gap among two wave crests and the equal for wave troughs. Frequency is the variety of oscillations that bypass through a specific point in a single 2d, measured in cycles according to 2nd. the distance among peaks is called the wavelength.

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The dot on the screen in the center of the fringe e to the left slit than it is from the dot to the right slit is 940 nm.

The wavelength of mild is defined as. It is far denoted with the aid of the Greek letter lambda (λ). consequently, the space between both one crest or trough of one wave and the next wave is known as wavelength.

A bright fringe creates constructive interference, the wavelength is always in multiple forms.

At the center fringe, the difference is (470 nm)(0) = 0

For the first maximum, the difference is (470 nm)(1) = 470 nm

For the second maximum, the difference = (470 nm)(2) = 940 nm

Thus, for nth maxima, the difference is (470 nm)(n)

From the image uploaded, C is located on the second maximum, therefore the difference is given as  (470 nm)(2) = 940 nm

Therefore, the dot on the screen in the center of the fringe is 940 nm.

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