A wire of resistivity rho must be replaced in a circuit by a wire of the same material but four times as long. If, however, the total resistance is to remain as before, the diameter of the new wire must.

Since water vapor makes up 1% of the air mass while that there are 1,000 mb of total pressure, the water evaporation rate would be 35 mb.

By applying a scalpel to a slice of fruit, one can observe a basic pressure. The surface won't be cut if you press the flat section of the sword against the fruit. The force is dispersed over a broad region.

Absolute, gauge, & differential pressure measurements are the three types. While gauge and difference pressures are reference to another pressure, such as the outside air pressure or the pressure in a nearby vessel, absolute pressure is defined as the maximum stress in a vacuum.

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The snake's length is approximately equal to its x-coordinate. Use the Pythagorean theorem to find the x-coordinate.)
The x coordinate is approximately equal to 10.0 * cos(60.0) = 8.66
The y coordinate is approximately equal to 10.0 * sin(60.0) = 5.00

What is x-coordinate?
Let's make sure humans know what it means to coordinate before we discuss an x-coordinate. Coordination establishes structure and direction for the relationship between the individuals or things. The same principle applies to an x-coordinate. The first digit in an ordered pair is known as an x-coordinate. The ordered pair consists of the x- and y-coordinates. For instance, the x-coordinate in the ordered pair (5, 3) is 5. Consider the alphabet when trying to recall which number is which. The letter x precedes the letter y in the alphabet. When referencing x-coordinate, the same holds true. The x-value coordinate's indicates how far we are from the origin and which way we are moving along the x-axis. The x-coordinate oscillates in a horizontal plane.

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Using energy considerations Since Ef=Ei, a rock thrown from the tip of a bridge doesn't matter which direction it is thrown in.

Given that,

Height of the bridge is 20m

Initial before he throws the rock

The height is hi = 20 m

Then, final height hitting the water

hf = 0 m

Initial speed the rock is throw

Vi = 15m/s

The speed at final is at which the rock hits the water

Vf = 24.8 m/s

Using given energy conservation

Ki + Ui = Kf + Uf

Where

Ki is initial kinetic energy

Ui is initial potential energy

Kf is final kinetic energy

Uf is final potential energy

Then,

Ki + Ui = Kf + Uf

Where

Ei = Ki + Ui

Where Ei is initial energy

E i =1/2mVi² +m*g*hi

E i =1/2m × 15² + m *9.8*20

E i = 112.5m + 196m

E i = 308.5m J

Now,

E f = Kf + Uf

E f =1/2mVf² + m*g*hf

E f =1/2m*24.8² + m*9.8* 0

E f = 307.52m + 0

E f = 307.52m J

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The kinetic energy of the block at B is 24J

we can solve this by using law of conservation of energy,

Ki = 10J                     Uf = 0 ( placed at origin point B)

Kf=?

Ui =mgh

To find height, h = 2 sin 30 = 1m

from this Ui = mgh = 20x1 = 20 J

law of conservation of energy,

Ki+ Ui + W = Kf + Uf  - (1)

work = - F X D = 3X2 = - 6 N

substituting in equation 1

10+20- 6 = Kf + 0

30-6 = Kf

Kf = 24 J

hence, KE at B is 24J

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The work is done by the man against gravity in climbing to the top with a 20 lb can of paint up a helical staircase that encircles a silo with a radius of 15 ft. if the silo is 120 ft high and the man makes exactly four complete revolutions is 25200 lb-ft.

When an external force moves an object over a distance, at least a portion of that force must be exerted in the direction of the displacement. Physics refers to this as work. If the force acting along the path is constant, the amount of work can be calculated by multiplying the length of the path by the force's component.

Formally, W = fd means that the work is equal to the force f times the length d. If the force is applied at an angle to the displacement, the work is W = fd cos.

Given:

The mass of man, m = 200 lb,

The mass of the can, M = 20 lb,

Calculate the work done y the following  formula,

W =  [tex]\int\limits^{120}_0} \,(215 -1/12y ) dy[/tex]

Here W is work done

Integrate the above equation, and we get,

W = 25200 lb ft.

Therefore, work is done by the man against gravity in climbing to the top with a 20 lb can of paint up a helical staircase that encircles a silo with a radius of 15 ft. if the silo is 120 ft high and the man makes exactly four complete revolutions is 25200 lb ft.

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I = 3.0A

What is current?

A stream of charged particles, such as electrons or ions, traveling through an electrical conductor or a vacuum is known as an electric current. The net rate of electric charge flowing through a surface or into a control volume is how it is calculated.

For a current-carrying wire running perpendicular to a magnetic field, the magnetic force acting on the wire is given by:

F = ILB

F = magnetic force, I = current, L = wire length, B = magnetic field strength

Given values:

F = 0.60N, L = 1.0m, B = 0.20T

Plug in and solve for I:

0.60 = I(1.0)(0.20)

I = 3.0A

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The calculated value of speed is 250km/hr x 5h = 50km/hr. The typical top speed of high-speed trains is 300-350 km/h.

Speed is calculated as follows: speed = distance * time. Knowing the units for distance and time is necessary to calculate the units for speed. The units will be in metres per second (m/s) in this example since the distance is measured in metres (m) and the time is measured in seconds (s). A megabit is one million bits, which are incredibly small pieces of data. Our internet activity should run more quickly the higher your Mbps (megabits per second) figure is.

speed =distance / time

= 250/5

=50 km / h

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An electric fan is turned off, and its angular speed decreases uniformly from 720 rev/min to 200 rev/min in a time interval of period 3.25.

In mechanics, acceleration is the price of trade of the rate of an item with recognition to time. Accelerations are vector quantities. The orientation of an item's acceleration is given by means of the orientation of the internet force performing on that item.

According to Newton's second regulation of movement, the acceleration of an object equals the internet force performing on it divided via its mass, or a = F m . This equation for acceleration can be used to calculate the acceleration of an object while its mass and the internet force appearing on it are regarded.

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The gravitational acceleration at 6400 m is 9.74 m/s² and at 6400 km is 2.43 m/s².

We need to know about the gravitational field to solve this problem. The gravitational field is the area where affected by gravitational force. The magnitude of the gravitational field can be calculated by this equation

g = G . m / (R+r)²

where g is the gravitational field, G is gravitational constant (6.67 x 10¯¹¹ Nm²/kg²), m is the mass of the planet and r is the radius of the planet

From the question above, we know that

m = 5.94 x 10²⁴ kg

R = 6371000 m

ra = 6400 m

rb = 6400000 m

Find the gravitational acceleration at 6400 m

g = G . m / (R + r)²

g = 6.67 x 10¯¹¹ . 5.94 x 10²⁴ / (6371000 + 6400)²

g = 9.74 m/s²

Find the gravitational acceleration at 6400 km

g = G . m / (R + r)²

g = 6.67 x 10¯¹¹ . 5.94 x 10²⁴ / (6371000 + 6400000)²

g = 2.43 m/s²

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The acceleration of the object with a horizontal force of 20N is 4.4 m/s².

How to Determine Horizontal Acceleration in Frictional Systems

Here, the angle of repose

a = tan⁻¹ (45)

a = tan⁻¹(1/5)

a = 11.3°

The angle of inclination is greater than the angle of repose.

The friction force on the block will act in an upward direction.

For the acceleration of the block:

MgsinΘ - μN = Ma

a = gsinΘ - μg cosΘ

a = g (sinΘ - u cosΘ)

a = 10 (sin37 - μ cos37)

a = 10 (0.6 - 0.2 * 4/5)

a = 10 ( 0.6 -0.16)

a = 4.4 m/s²

Thus the acceleration of the object is 4.4 m/s².

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Answer:

The particles have more distance in them which impacts the density.

Explanation:

A solid's particles are much more closer together than that of a liquid's particles. Same thing goes for gas particles(they are much more far apart than liquid particles). This is why solids usually are more denser than liquids and gas, due to the way their particles are structured. Hope this helps!

Under development at MIT, photonic crystals allow solar panels to be twice as efficient by absorbing and converting the sun’s Heat.

A periodic change in the refractive index characterizes an optical nanostructure known as a photonic crystal. Similar to how the shape of natural crystals causes X-ray diffraction and how semiconductors' atomic lattices (crystal structure) affect their conductivity of electrons, this has an impact on how light travels. In nature, photonic crystals take the shape of structural colouring and animal reflectors, and when created artificially, they hold promise for a variety of uses.

It is possible to create photonic crystals in one, two, or three dimensions. Thin film layers that are placed on top of one another can form one-dimensional photonic crystals. For two-dimensional ones, photolithography or drilling holes in an appropriate substrate can be used.

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( a) By energy conservation, the speed of the passenger when the elevator hits the floor is

      1 / 2 mv2 = mgh

         v =     √2gh

Substituting the values we can find the value of v = 26.6 m/s

The magnitude of the impulse is

J=∣Δp∣=m∣Δν∣=mν=(90kg)(26.6m/s)≈2.39×10 3 N⋅s .

(b) With duration of Δt=5.0×10 −3 s for the collision , average force is

             F avg  =  J /Δt

                           = 2.39×10 N⋅s / 5.0×10 −3 s N⋅s

                            ≈4.78×10 5 N .

(c) If the passenger were to jump upward with a speed of ν  =7.0m/s  , then the resulting downward velocity would be

             ν ′′ =ν−ν  =26.6m/s−7.0nm/s=19.6m/s ,

and the magnitude of the impulse becomes

     J ′′=∣Δp ′′ ∣=m∣Δν ′′ ∣=mν ′′

           =(90kg)(19.6m/s)≈1.76×10 3 N⋅s .

(d) The corresponding average force would be

       F avg′′= J ′′Δt  =   1. 76×10 3 N⋅s  /  5.0×10 −3 s

                ≈3.52×10 5 N .

This is how we can determine impulse , average force before collision and at the stopping time.

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2.05×10^9 m distance far away is the object it bounced off.

velocity= distance/time

velocity= 3×10^8 m/s

time= 5.4

velocity= distance/time

distance= 3×10^8×5.4

distance=2.05×10^9 m

Distance is the length between two locations or things, independent of direction. Since distance is a scalar property, it only takes into consideration the total magnitude and ignores the start and finish positions. Since distance is a scalar attribute, it can only have a positive or zero value; it cannot have a negative value.

The most common unit of measurement for distance is the meter (m), while larger distances can also be stated in kilometers (km), while smaller distances can be expressed in centimeters (cm) or millimeters (mm). When calculating distance, the letter D is often used to represent the distance traveled.

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The wavelength of the light is 470 nm.

Explain Young's double-slit interference experiment?

The Young's double-slit experiment is a proof in current physics that light and matter can exhibit properties of both classically defined waves and particles. It also shows that quantum mechanical processes are inherently probabilistic.

Bright Fringes' Position

A brilliant fringe to appear at P with maximal intensity

Path difference, z = n, where n = 0, 1, 2,...

Therefore, xd/D = n.

x = nλD/d

The nth brilliant fringe is located at a distance of

xn = nλD/d

Ist order maximum= λD/d

4.7 x 10^-3 =  λ x 3.8 /0.38 x 10^-3

4.7 x 0.38 x 10^-6 / 3.8 = λ

λ = 0.47 x 10^-6 m

  = 470 x 10^-9 m

​

Hence, The wavelength of the light is 470 nm.

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The main difference between vulnerability scanning and penetration testing is the automation.

A vulnerability scan is an automated, high-level test which looks for potential vulnerabilities and reports those vulnerabilities. A vulnerability scan is also known as vulnerability assessment. It assesses computers, systems and networks for security weaknesses.

A penetration test is done by a real person rather an automated machine. It is a detailed hands on examination that tries to detect and exploit weaknesses in your system. A penetration test simulates a hacker's attempt to get into a business system through research and the exploitation of vulnerabilities.

Therefore, the main difference between vulnerability scanning and penetration testing is the automation.

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The primary surprise regarding the first planet found orbiting another regular star was the fact that its orbit took only 4 days to complete.

Astronomy has long employed the method, also known as the radial velocity method. The same telescope that astronomers used to find this planet was also used to find the first planet ever discovered around a sun-like star using radial velocity.

Finding exoplanets can be done using the Doppler method. The motion and characteristics of the star and planet are examined using the Doppler effect. The planet and the star are revolving around the same mass.

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The reaction time of the student is approximately 0.2 s (Option B)

Considering the question given above, the following formula can be use to obtain the time

h = ½gt²

Where

Now, let us calculate the reaction time of the student. This is shown below:

h = ½gt²

0.20 = ½ × 9.8 × t²

0.20 = 4.9 × t²

Divide both side by 4.9

t² = 0.20 / 4.9

Take the square root of both side

t = √(0.20 / 4.9)

t = 0.2 s

Thus, the reaction time is 0.2 s (Option B)

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The energy will be transferred unless both the plastic and glass are at the same temperature, and there's no heat transfer.

The total amount of energy in the universe has never changed and will never change because it cannot be created or destroyed. This does not imply that energy cannot change forms or even move between objects though; it does.

The internal energy of a system as a result of its temperature is referred to as thermal energy. The molecules that make up a substance move more quickly as it is heated, gaining thermal energy via the transmission of heat. The term "heat" refers to the thermal energy being transported from a hotter system to a cooler one. Temperature is used to assess the degree of "hotness" or "coldness" of an object. There are three methods by that thermal energy can be transferred: conduction, convection, and radiation.

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The horizontal distance at which the parcel should be dropped away from the island in order to be landed there is 697.5 m.

The horizontal distance travelled by the plane is calculated as follows;

X = vt

where;

h = ut + ¹/₂gt²

where;

h = 0 + ¹/₂gt²

h = ¹/₂gt²

2h = gt²

t = √(2h/g)

t = √(2 x 100 / 9.8)

t = 4.5 seconds

Horizontal distance = 155 m/s x 4.5 s

Horizontal distance = 697.5 m

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The force required to keep the box moving at a constant speed is 45.4 N

Friction is the force that resists relative motion as elements of solid surfaces, fluid layers, and materials slide over each other. A type of contact force that exists between contact surfaces.

We know that;

Fₙ = m × a

Where, Fₙ = Net force

m = mass of the object (11.3 kg)

a = acceleration

Since the box is moving with a constant speed which means there is no acceleration.

Fₙ = 11.3 × 0

Fₙ = 0

Now,

Fₓ = μmg

Where, Fₓ = Friction force

μ = coefficient of kinetic friction (0.41)

m = mass of the box (11.3 kg)

g = gravitational acceleration (9.8m/s²)

Fₓ = 0.41 × 11.3 × 9.8

Fₓ = 45.4 N

We know that,

Fₙ = Fₐ - Fₓ

Where, Fₙ = Net force

Fₐ = Applied force

Fₓ = Friction force

Since Fₙ = 0, then:

0 =  Fₐ - 45.4

Fₐ = 45.4 N

Therefore, if the kinetic friction force is equal to the applied force, the acceleration will be zero and the body will move with constant velocity.

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The minimum period in which the string will break will be 0.534 sec.

Mass = 100 gm =0.1 kg

Length = 60 cm =0.6 m

Tension on string = 5N

Height of center of circle = 200 cm = 2m

At the bottom point , mv2r / mg

Now, 5N = ( 0.1 kg( v x v) /0.6 m + (0.1 kg) ( 9.8 m/s2)

hence the value of v = 4.91 m/s.

So the height of the wall will fall is 200 cm - 60 cm = 140 cm

The distance travelled can be calculated by the s = ut + 1/2 gt2

as u = 0 and s =H

H=  1/ 2 gt 2

t = √2 H / g

Substituting the values we get time as t = 0.534 sec

Distance = 4.91 m/sec x 0.534 sec

              = 2.62 meters

How to calculate period of motion in physics?

The period of an oscillating system can be defined as the time taken to complete one cycle.  It is the reciprocal of frequency in physics, which is the number of cycles per unit time. To calculate the period of a wave or a simple harmonic oscillator by comparing it to orbital motion.

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Answer:

O Writing a rough draft

Explanation:

Thats the second step after generating ideas and choosing.

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Parallel Plate Capacitors are formed by an association of electrodes and insulating material or dielectric. A parallel plate capacitor can simplest shop a finite quantity of electricity before a dielectric breakdown happens.

A capacitor works on the precept that the capacitance of a conductor suggests boom whilst an earthed conductor is added near it. therefore, the capacitor has parallel plates dealing with each other in contrary instructions and are separated through ways or holes.

The most effective layout for a capacitor is a parallel plate, which consists of two metallic plates with an opening among them: electrons are located onto one plate the terrible plate, while an equal amount of electrons are removed from the opposite plate the fantastic plate.

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The time taken for the man to reach the ground is 0.64 s and his velocity on reaching the round is 6.26 m/s.

Given that we can be able to use the equations of kinematics to obtain the time that it took the man to fall to the floor. Using the equation;

v^2 = u^2 + 2gh

v = final velocity

u = initial velocity

g = acceleration due to gravity

h = height attained

Note that u= 0 m/s since he dropped from a height;

v= √2gh

v = √2 * 9.8 * 2

v = 6.26 m/s

Again;

v = u + gt

Again  u= 0 m/s

v = gt

t = v/g

t = 6.26 m/s/9.8 m/s

t = 0.64 m/s

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The spring constant is 38.6 N/m

Simple harmonic movement is a unique kind of periodic motion in which the restoring force on the shifting item is without delay proportional to the value of the item's displacement and acts toward the item's equilibrium role.

Calculation:-

A. Time period T = 2π√m/K

  T² = (2π)² m/k

⇒ K = 4π²m/k

⇒ K = 4π²m/T²

      = 4π²×0.55/(0.75)²

⇒ K = 38.6 N/m

Simple harmonic motion is defined as a periodic motion of a factor alongside an instant line, such that its acceleration is usually towards a hard and fast factor in that line and is proportional to its distance from that factor.

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The factor by which the density is increased F = 2.86.

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Place the following in order, following (a) are:

a. Gravity pulls particles toward the center.

c. Particles fall toward the center, converting gravitational energy to kinetic energy.

f. Friction converts kinetic energy to thermal energy.

e. Thermal energy heats the material.

b. Warm material rises and expands.

d. Expanding materials cool.

In physics, gravity is an essential interplay that reasons mutual appeal between all things with mass or electricity. Gravity is, through a long way, the weakest of the 4 essential interactions, approximately 1038 instances weaker than the sturdy interaction, 1036 times weaker than the electromagnetic force, and 1029 instances weaker than the susceptible interplay. As an end result, it has no tremendous influence on the extent of subatomic debris. but, gravity is the biggest interaction between gadgets on the macroscopic scale, and it determines the movement of planets, stars, galaxies, or even light.

The gravitational enchantment between the authentic gaseous count within the Universe allowed it to coalesce and shape stars which in the end condensed into galaxies, so gravity is answerable for some of the huge-scale systems within the Universe. Gravity has a limitless range, despite the fact that its consequences emerge as weaker as objects get farther away.

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Answer:

Explanation:

Given:

M = 6,40·10²³ kg

R = 8.01·10⁵ km = 8.01·10⁸ m

G = 6.67·10⁻¹¹ N·m²/kg²

____________________

T - ?

Orbital speed:

V = √ ( G·M / R) = √ (6.67·10⁻¹¹·6,40·10²³ / 8.01·10⁸) ≈ 220 m/s

Orbit length:

D = 2·π·R = 2·3.14·8,01·10⁸ = 5·10⁹ m

Period:

T = D / V = 5·10⁹ / 220 ≈ 23·10⁶ s = 266 days