The team coach is watching the bowler. She notes in Table 1 how


far the ball travels, and the time taken to reach the batsman.


Table 1


Ball


1


2


3


4


5


Time in s


0. 42


0. 46


0. 48


0. 55


0. 58


Distance in m


17. 55


18. 30


18. 40


17. 90


17. 75


Suggest a pattern, if any, between the time the ball is in flight and


the distance the ball travels.



What is the resolution of the stopwatch the team coach uses to


time the ball?

Light travels in the form of electromagnetic waves, the reason why light can travel through outer space but sound cannot is due: to the differences in the way light and sound waves propagate, and the properties of the medium through which they travel.

Light travels in the form of electromagnetic waves, which consist of oscillating electric and magnetic fields. These waves can propagate through a vacuum, like outer space, because they do not require a medium for transmission. As a result, light from stars and other celestial bodies can reach us even though they are located in the vacuum of space.

On the other hand, sound waves are mechanical waves that require a medium, such as air, water, or solids, to transmit their energy. Sound waves move by causing vibrations in the particles of the medium, creating areas of compression and rarefaction. Outer space is largely devoid of particles, being a near-perfect vacuum, and thus there is no medium for sound waves to propagate through. Consequently, sound cannot travel through outer space, unlike light.

In summary, light can travel through outer space because it consists of electromagnetic waves that do not require a medium for propagation, while sound cannot travel in outer space because it consists of mechanical waves that require a medium for transmission.

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As a passenger on the spaceship, you would not notice any change in the length of your spaceship, even as its speed increases, because you are in the same frame of reference as the spaceship.

When you are a passenger on a spaceship, and the speed of the spaceship increases, you would observe that the length of your spaceship is not changing (Option C). This phenomenon is due to the fact that you and the spaceship are in the same frame of reference, and you both are moving together at the same speed.

However, if an external observer were watching the spaceship from a stationary point, they would observe the length of the spaceship getting shorter as its speed increases. This phenomenon is known as "length contraction" and occurs due to the theory of special relativity, proposed by Albert Einstein. Length contraction states that an object's length in the direction of motion will contract as it approaches the speed of light, but this is only observed by an external observer who is not moving with the object.

In summary, as a passenger on the spaceship, you would not notice any change in the length of your spaceship, even as its speed increases, because you are in the same frame of reference as the spaceship. The length contraction phenomenon would only be observed by an external observer who is not moving with the spaceship.

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The efficiency of the bike can be calculated by dividing the work output by the energy input and multiplying the result by 100%. In this case, the bike is 91.67% efficient.

The efficiency of a machine is defined as the ratio of the work output to the energy input. In this case, the energy input is given as 600 joules per minute, and the work output is 550 joules.

Therefore, the efficiency of the bike can be calculated using the following formula:

Efficiency = (Work output / Energy input) x 100%

Substituting the given values, we get:

Efficiency = (550 / 600) x 100%

Efficiency = 0.9167 x 100%

Efficiency = 91.67%

This means that the bike is 91.67% efficient, which is the percentage of the energy input that is converted into useful work output. The remaining energy is lost as heat due to friction, air resistance, and other factors.

Therefore, the efficiency of the bike can be improved by reducing these losses through proper maintenance and adjustments.

In summary, the efficiency of the bike can be calculated by dividing the work output by the energy input and multiplying the result by 100%. In this case, the bike is 91.67% efficient.

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To solve this problem, we can use the work-energy theorem which states that the net work done on an object is equal to its change in kinetic energy. The correct answer is A) 125 J.

Initially, the bullet has a kinetic energy of (1/2)[tex]mv^{2}[/tex], where m is the mass of the bullet and v is its velocity.

Finally, the bullet has a kinetic energy of (1/2)[tex]mv^{2}[/tex], where v is the velocity with which it exits the wall.

The change in kinetic energy is given by (1/2)m([tex]v^{2}-u^{2}[/tex]), where u is the initial velocity.

Therefore, the work done in passing through the wall is given by: W = (1/2)m([tex]v^{2}-u^{2}[/tex]) = (1/2)(0.025)([tex]100^{2}-200^{2}[/tex]) = 125 J

Therefore, the correct answer is A) 125 J.

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The thermometer would read 93.9°F on a day when the temperature is 30°F. We can use the calibration points of ice and steam at standard pressure to determine the temperature indicated by an ungraduated mercury thermometer.

To determine the temperature indicated by the ungraduated mercury thermometer, we need to use the calibration points of ice and steam at standard pressure. The difference between the two calibration points is 252.4 mm - 22.8 mm = 229.6 mm.

We can calculate the temperature corresponding to 229.6 mm using the conversion formula for mercury thermometers:

[tex]t = [(L-Q)/(L-U)] \times (t_U - t_Q) + t_Q,[/tex]

where L is the length of the mercury thread in the thermometer, Q is the length of the mercury thread at the ice point, U is the length of the mercury thread at the steam point, t_U is the temperature of the steam point (100°C at standard pressure), and t_Q is the temperature of the ice point (0°C at standard pressure).

Substituting the given values, we get:

[tex]t = [(229.6 - 22.8)/(252.4 - 22.8)] \times (100^{\circ}C - 0^{\circ}C) + 0^{\circ}C = 34.4^{\circ}C.[/tex]

To convert this temperature to Fahrenheit, we can use the conversion formula:

[tex]T(^{\circ}F) = T(^{\circ}C) \times 9/5 + 32[/tex]

Substituting the calculated temperature, we get:

[tex]T(^{\circ}F) = 34.4^{\circ}C \times 9/5 + 32 = 93.9^{\circ}F[/tex]

Therefore, the thermometer would read 93.9°F on a day when the temperature is 30°F.

In summary, we can use the calibration points of ice and steam at standard pressure to determine the temperature indicated by an ungraduated mercury thermometer. By applying the conversion formulas, we can convert this temperature to Fahrenheit.

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The wavelength of the sound wave, given that wave has a frequency of 35 Hz and travelling at 1500 m/s is 42.86 m

First, we shall list out the given parameters from the question. This is given below:

The wavelength of the sound wave can be obtained as illustrated below:

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

1500 = wavelength × 35

Divide both sides by 35

Wavelength = 1500 / 35

Wavelength = 42.86 m

Thus, from the above calculation, we can conclude that the wavelength of the sound wave is 42.86 m

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The first bright fringe occurs at an angle of approximately 1.564° away from the Centerline in a two-slit experiment using monochromatic coherent light with a wavelength of 600 nm and slits separated by 2.20 x 10^-5 m.

In a two-slit experiment, we observe interference patterns created by monochromatic coherent light. The angle at which the first bright fringe occurs can be found using the formula for constructive interference:

d * sin(θ) = m * λ

Here,
d = distance between the slits (2.20 x 10^-5 m)
θ = angle of the bright fringe from the centerline
m = order of the fringe (m=1 for the first bright fringe)
λ = wavelength of the light (600 nm or 6.00 x 10^-7 m)

Now, rearrange the formula to solve for θ:

sin(θ) = (m * λ) / d

Substitute the values:

sin(θ) = (1 * 6.00 x 10^-7 m) / (2.20 x 10^-5 m)

sin(θ) ≈ 0.0273

Now, find the angle θ:

θ = arcsin(0.0273)

θ ≈ 1.564°

So, the first bright fringe occurs at an angle of approximately 1.564° away from the centerline in a two-slit experiment using monochromatic coherent light with a wavelength of 600 nm and slits separated by 2.20 x 10^-5 m.

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Answer:

The spring constant is 3.0 kg

The number of atoms of carbon (C) in 1.23 moles of carbon is 7.41 x 10²³ atoms.

The number of atoms of carbon (C) in 1.23 moles of carbon is calculated by using Avogadro's number as shown below;

n_A = An

where;

n_ A  = A x n

n_ A = 1.23 moles x 6.022 x 10²³ atoms/mole

n_A = 7.41 x 10²³ atoms

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Sensing systems incorporated into harvesting machines that register and record amounts of harvests associated with specific portions of a planted field are called monitoring systems.

Monitoring systems in harvesting machines use sensing technologies to collect data on the quantity and quality of crops being harvested. These systems typically consist of sensors that measure various physical parameters, such as weight, moisture content, and color, which are then processed and analyzed to provide information on crop yield and quality.

By using monitoring systems, farmers and agricultural managers can obtain real-time information on crop performance, identify areas of the field with higher or lower yields, and make more informed decisions regarding irrigation, fertilization, and other cultivation practices.

This data can also be used to optimize the use of resources, reduce waste, and increase profitability. Overall, monitoring systems play an important role in precision agriculture, which aims to improve the efficiency and sustainability of agricultural practices.

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The final internal energy of the gas is 1.07 x [tex]10^{10[/tex] J.

What is Energy?

Energy is a fundamental physical quantity that refers to the ability of a system to do work or produce heat. It is a scalar quantity that has many different forms, including kinetic energy, potential energy, thermal energy, electromagnetic energy, and more.

The energy released by the combustion of 11.4 L of gasoline per vehicle per day is given as 4.3 x [tex]10^{7[/tex] J. Let's assume that this energy is transferred by heat to the gas in the cylinder. The energy transferred by work is one-third of this, which is 4.3 x [tex]10^{7[/tex] J / 3 = 1.43 x [tex]10^{7[/tex]J.

The first law of thermodynamics states that the change in internal energy of a system is equal to the heat added to the system minus the work done by the system:

ΔU = Q - W

where ΔU is the change in internal energy, Q is the heat added to the system, and W is the work done by the system.

In this case, the heat added to the system is 4.3 x [tex]10^{7[/tex] J, and the work done by the system is -1.43 x [tex]10^{7[/tex] J (since work done on the gas is negative). Therefore, the change in internal energy is:

ΔU = 4.3 x [tex]10^{7[/tex]J - (-1.43 x [tex]10^{7[/tex] J) = 5.73 x [tex]10^{7[/tex] J

Since the initial internal energy of the gas is 1.00 x [tex]10^{10[/tex] J, the final internal energy is:

Uf = Ui + ΔU = 1.00 x [tex]10^{10[/tex] J + 5.73 x [tex]10^{7[/tex] J = 1.07 x [tex]10^{10[/tex] J

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The new 3rd harmonic frequency is 869 Hz. The 3rd harmonic means that the trumpet has three nodes and two antinodes, and the standing wave has three segments.

The frequency of the 3rd harmonic can be found by multiplying the fundamental frequency by 3, so the original length of the trumpet must be such that the 3rd harmonic frequency is 510 Hz.

Using the formula for the wavelength of a standing wave, λ = 2L/n, where L is the length of the trumpet and n is the harmonic number, we can find the original length to be L = (2λ/3). Substituting λ = v/f, where v is the speed of sound and f is the frequency, we get L = (2v/3f).

So, the original length of the trumpet is L = (2 x 343 m/s)/(3 x 510 Hz) = 0.450 m. Adding 0.110 m to the length gives the new length L' = 0.560 m. Using the same formula and harmonic number, we can find the new frequency f' to be f' = (3v/2L') = (3 x 343 m/s)/(2 x 0.560 m) = 869 Hz. Therefore, the new 3rd harmonic frequency is 869 Hz

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Answer:

An infrared camera – also called IR camera, thermal means heat it can track your heat camera or thermal camera – is a measuring  by instrument it means its a measuring tool

used for non-contact measurements of the surface temperature of objects.

Explanation:

kids are oof

Without additional context or information, it is impossible to determine the particular wave

In physics, a wave is a disturbance that travels through space and time, often transferring energy from one place to another. Waves can take many forms, including sound waves, light waves, water waves, and seismic waves. They are characterized by properties such as amplitude, frequency, wavelength, and speed.

Waves are an important concept in many areas of physics, including mechanics, electromagnetism, and quantum mechanics. They can be described mathematically using equations such as the wave equation and are fundamental to our understanding of the behavior of the physical world.

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The ball will fall straight down to the floor of the train.

Since the train is moving at a constant velocity in a straight line, the ball, like any other object inside the train, is also moving at the same constant velocity. When the ball is released from the mechanical claw, it will continue to move forward with the same velocity as the train. However, since there are no external forces acting on the ball, it will fall straight down due to the force of gravity, as if the train were at rest.

From the perspective of an observer outside the train, the ball would appear to follow a curved path due to the combination of its horizontal velocity (which matches that of the train) and its vertical velocity (which is due to gravity). But from the perspective of an observer inside the train, the ball appears to fall straight down, as if the train were stationary. This is because the observer inside the train is also moving at the same constant velocity as the train and the ball, and therefore has no way to detect the train's motion relative to the outside world.

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A person's strength, speed, power, agility, flexibility, and endurance are all increased with cross training, which also helps to reduce the chance of injury.

Cross-training is the technique of preparing employees to perform duties that go outside of their typical responsibilities or to work in multiple different jobs. For instance, cross-training could be used to teach someone who works in collections how to work in billing, and the other way around.

This is based on the finding that strengthening one limb while exercising the opposite limb results in a phenomena known as cross-training, also known as the contralateral strength training effect.

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True. Cross training is a type of training routine that combines two or more different exercises into a workout to prevent injuries, burnout, and overuse.

What is the cross-training training method?

Cross-training is the technique of preparing employees to perform duties that go outside of their typical responsibilities or to work in multiple different jobs. For instance, cross-training could be used to teach someone who works in collections how to work in billing, and the other way around.

A piece of cardio training equipment is a cross trainer, commonly referred to as an elliptical trainer. It is a fantastic full-body exercise and works your arms and legs at the same time. Cross training and a cross trainer are very different from one another, however a cross trainer can play a significant role in a cross training regimen.

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The field’s direction changes with the current’s direction this conclusion is best supported by the image. Hence option A is correct.

Current is a flow of charges. it is denoted by i and expressed in ampere A. Mathematically it is expressed as i = q/t, where q is the amount of charge and t is time. Current is nothing but amount of charges flown in the unit time in the electric wire. Charge is expressed in coulomb C and time in second s. hence coulomb per second (C/s) is ampere A. Charge on electron is 1.60217663 × 10⁻¹⁹ which is called as elementary charge.

There are two types of the current, Convectional current and non-conventional current. Convectional current is the current flows from positive to negative. Non convectional current flows direction from negative to positive. Note that flow of electrons is from negative to positive. Hence direction of flow of conventional current is from positive to negative.

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Answer:

Red is your warm front.
Blue is your Cold front
Red and blue is your stationary front

Explanation:

To launch a satellite towards the west, the rocket must have a velocity of 8.38 km/s, which is the sum of the Earth's rotational velocity and the desired speed of the satellite relative to the Earth's surface.

If we want to launch a satellite in the opposite direction of the Earth's rotation, it would have to be launched from west to east. The Earth rotates towards the east with a velocity of approximately 465.1 m/s at the equator.

Hence, to launch the satellite towards the west, the rocket must have a velocity of 465.1 m/s plus the desired speed of the satellite relative to the Earth's surface. The magnitude of the rocket's velocity relative to the Earth's surface would depend on the altitude at which the satellite is to be placed.

If we assume a low Earth orbit of 200 km, then the satellite must move at a speed of approximately 7.91 km/s relative to the Earth's surface. Therefore, the rocket launching the satellite would have to travel at a velocity of approximately 8.38 km/s (7.91 km/s + 465.1 m/s) relative to the launching site on the equator.

In summary, to launch a satellite towards the west, the rocket must have a velocity equal to the sum of the Earth's rotational velocity and the desired speed of the satellite relative to the Earth's surface.

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The highest frequency x-rays produced by [tex]8 \times 10^4 eV[/tex] electrons is approximately[tex]1.93 \times 10^{19} Hz[/tex]. This equires the use of the formula for the maximum energy of the emitted photon, which takes into account the energy of the electron and Planck's constant.

To calculate the highest frequency x-rays produced by [tex]8 \times 10^4 eV[/tex]electrons, we need to use the formula for the maximum energy of the emitted photon: E = hf, where E is the energy of the electron, h is Planck's constant, and f is the frequency of the emitted photon.

First, we convert the energy of the electron from electron volts to joules using the conversion factor [tex]1 eV = 1.6 \times 10^{-19} J:[/tex]

[tex]E = 8 \times 10^4 eV \times 1.6\times10^{-19} J/eV[/tex]

[tex]E = 1.28\times10^{-14} J[/tex]

Next, we can use the formula to solve for the frequency of the emitted photon:

f = E/h

[tex]f = (1.28 \times10^{-14} J)/(6.626 \times 10^{-34} J s) \approx 1.93 \times10^{19} Hz[/tex]

Therefore, the highest frequency x-rays produced by [tex]8 \times 10^4 eV[/tex]electrons is approximately [tex]1.93 \times 10^{19} Hz.[/tex]

In summary, the calculation of the highest frequency x-rays produced by [tex]8 \times 10^4 eV[/tex] electrons requires the use of the formula for the maximum energy of the emitted photon, which takes into account the energy of the electron and Planck's constant. The result is an approximation of the frequency of the emitted photon in hertz.

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The rear defroster is consuming 30.00 watts of electric power as it melts the frost. Electric power is the rate at which electrical energy is consumed or produced.

It is calculated by multiplying the voltage (V) across a device or component by the current (I) flowing through it.

To calculate the electric power consumed by the rear defroster, you can use the formula:

Power (P) = Voltage (V) × Current (I)

Given:

Current (I) = 6.00 A

Voltage (V) = 5.00 V

Substituting the values into the formula:

P = 5.00 V × 6.00 A

P = 30.00 W

Therefore, the rear defroster is consuming 30.00 watts of electric power as it melts the frost. The power indicates how quickly the defroster can generate heat and melt the frost on the rear window of the car.

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Balancing two forces acting on one side of a pivot point with a single force on the other side is a common concept in physics. The PhET Balancing Act simulation can help us understand this concept better.

When we have two forces acting on one side of a pivot point, it creates an imbalance. To balance the system, we need to add a single force on the other side of the pivot point. The question is, what should be the distance of this single force from the pivot point to balance the two forces?

According to the simulation, the best answer is (i) This is possible with a single force at the same distance from the pivot point but on the opposite side of the pivot point as one of the forces. This means that we can balance the two forces by placing a single force on the opposite side of the pivot point, at the same distance as one of the forces. This works because the force and distance on both sides of the pivot point are equal, creating a balanced system.

Answer (ii) states that it is possible with a single force at the same distance as the point halfway between the two forces from the pivot point but on the opposite side of the pivot point. This is incorrect because the distance is not equal on both sides of the pivot point, and the system will not be balanced.

Answer (iii) states that it requires two forces. This is also incorrect because we can balance the system with a single force, as explained in answer (i).

In conclusion, balancing two forces acting on one side of a pivot point with a single force on the other side is possible by placing the single force at the same distance from the pivot point but on the opposite side of the pivot point as one of the forces. This creates a balanced system where the force and distance on both sides of the pivot point are equal.

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When the New Horizons spacecraft performed its flyby of Pluto in July 2015, it captured the first close-up images of the dwarf planet's surface, revealing a surprising and complex world.

Astronomers were amazed to discover that Pluto's surface was much more varied and dynamic than previously thought.

The images showed a diverse landscape of mountains, craters, glaciers, and vast plains of frozen nitrogen and methane.

These features hinted at an active geological history and suggested that Pluto was far from the cold and dead world that scientists had once believed.

The images also revealed a heart-shaped region on Pluto's surface, now known as the Tombaugh Regio, which is believed to be a massive impact crater filled with frozen nitrogen and methane.

Other notable features include the Sputnik Planitia, a vast plain of smooth ice, and the towering mountains of the Hillary Montes range.

Overall, the New Horizons mission has provided an unprecedented glimpse into the fascinating and complex world of Pluto, challenging our understanding of the outer solar system and inspiring further exploration and discovery.

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It should be noted that the statement regarding the weightlifter is true.

A weightlifter must apply a certain amount of force to lift a set of barbells off the ground. This force is known as the lifting force and it must be greater than the weight of the barbells in order to overcome the force of gravity and lift the barbells.

The amount of lifting force required will depend on the weight of the barbells and the strength of the weightlifter's muscles. The weightlifter can increase their lifting force by improving their strength and technique through training and practice.

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A weight lifter must be expert of force to lift a set of barbells off the ground

true or false

The magnitude of electric field strength at a point 2.2cm to the left is 2.694 x 10⁶ N/C.

The magnitude of the force on a -2.7 μC charge is 7.2898 N.

Calculate the electric field at the given point due to the two positive charges using the formula:

E = k × Q / r²

where k = Coulomb's constant,

Q = charge, and

r = distance from the charge to the point of interest.

For the first positive charge,

Q = 6.5 μC and

r = 4.3 cm + 2.2 cm = 6.5 cm = 0.065 m.

Plugging these values into the formula gives:

E1 = (8.98755 x 10⁹ N. m²/C²) × (6.5 x 10⁻⁶ C) / (0.065 m)² = 2.054 x 10⁵ N/C

For the second positive charge,

Q = 1.4 μC and

r = 4.6 cm - 2.2 cm = 2.4 cm = 0.024 m.

Plugging these values into the formula gives:

E2 = (8.98755 x 10⁹ N. m²/C²) × (1.4 x 10⁻⁶ C) / (0.024 m)² = 4.249 x 10⁶ N/C

Subtract its contribution from the total electric field.

For the negative charge,

Q = -2.7 μC and

r = 2.2 cm = 0.022 m.

Plugging these values into the formula gives:

E3 = (8.98755 x 10⁹ N. m²/C²) × (-2.7 x 10⁻⁶ C) / (0.022 m)² = -1.609 x 10⁶ N/C

The total electric field at the point of interest is then:

Etotal = E1 + E2 + E3 = 2.054 x 10⁵ N/C + 4.249 x 10⁶ N/C - 1.609 x 10⁶ N/C = 2.694 x 10⁶ N/C

Now, to calculate the force on a -2.7 μC charge placed at this point:

F = q × E

where q = charge and E = electric field.

Plugging in the values gives:

F = (-2.7 x 10⁻⁶ C) * (2.694 x 10⁶N/C) = -7.2898 N

The negative sign indicates that the force is directed in the opposite direction to the electric field, which makes sense since the charge is negative.

Therefore, the magnitude of the force is:

|F| = 7.2898 N

Answer for part 1: 2.694 x 10⁶ N/C

Answer for part 2: 7.2898 N

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The net force acting on q₂ when Particle is positioned between q₁ and q₃ is 0.486N.

Inversely proportional to the square of the distance between charges and proportionate to the product of their magnitudes is the electrostatic force of attraction or repulsion.

Force on q₂ due to q₁

F₁₂ = kq₁q₂ / r₁₂²

Putting the values provided , may get

F₁₂ = 9 x 10⁹ x 5 x 10⁻⁶ x 2.5 x 10⁻⁶ / (0.5)²

F₁₂ = 0.414 N

Force on q₂ due to q₃ placed at distance 0.25m

F₂₃ =kq₂q₃ / r₂₃²

Substitute the values, can get

F₂₃ =  9 x 10⁹ x 2.5 x 10⁻⁶ x 2.5 x 10⁻⁶ / (0.25)²

F₂₃ = 0.9N

The net force can be calculated as

F =F₂₃ -F₁₂

F =0.9 - 0.414 = 0.486 N

Therefore, the net force of q₂ is 0.486 N.

The complete question is,

Particles q1, q2, and q3 are in a straight line. Particles q1 = -5.00 x 10^-6 C, q2 = +2.50 x 10^-6 C, and q3 = -2.50 x 10^-6 C. Particles q1 and q2 are separated by 0.500 m. Particles q2 and q3 are separated by 0.250 m. What is the net force on q2?

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The intensity of an electromagnetic wave will therefore rise by a factor of four if both the electric and magnetic fields of the wave double in magnitude.

The square of the amplitude of the electric field, the square of the amplitude of the magnetic field, or the sum of the amplitudes of the two fields determines the intensity of an electromagnetic wave.

The wave change's intensity grows by a factor of four.

In physics, the transmitted power per unit area measured in the plane perpendicular to the direction of the energy's transmission is known as the intensity or flux of radiant energy. The base unit in the SI system is kg/s³ or watts per square meter (W/m²). With waves like sound waves or electromagnetic waves like light or radio waves, intensity most frequently refers to the average power transfer over the course of the wave. There are various circumstances where energy is transferred to which intensity can be applied.

The energy density (energy per unit volume) at a place in space and the speed at which the source is moving can both be used to determine intensity.

The complete questions is,

If both the electric and magnetic fields of an electromagnetic wave double in magnitude, how does the intensity of the wave change?

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In a given stationary wave, the distance between two successive nodes or antinodes is half of the wavelength.

The distance between identical points (adjacent crests) in adjacent cycles of a waveform signal carried in space or along a wire is defined as the wavelength.

The SI unit of wavelength is the meter, abbreviated as m. Multiples or fractions of a meter are also employed when measuring wavelength.

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Then both passengers, as well as the lift, are in free fall, and both accelerate downwards at the same acceleration. so, there is zero force between them.

3. vertical forces on the passenger = Fv= N-w, upwards [where N is normal force and w is its weight]

Fv= N-w= m*a =>so the force the floor exerts on the passenger is N = m*a + m*g = 1003 N.

4. vertical forces on the passenger = Fv= N-w, upwards

Fv= N-w= -m*a [-ve sign because acceleration is downwards while Fv is upwards]

so, N= m*g - m*a = 663 N.

5. if the cable breaks suddenly, the passenger's acceleration is same as gravity, so a= g; N= m*g - m*g = 0 N.

Then both passengers, as well as the lift, are in free fall, and both accelerate downwards at the same acceleration. so, there is zero force between them.

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The thermal expansion coefficient of concrete is typically around 3.5 × [tex]10^{-5[/tex]  /°C. Using this value and assuming that the temperature increase is in Celsius, the change in length is 4,500 m.

We can calculate the change in length of the spans as follows:

ΔL = αL * ΔT

here α is the thermal expansion coefficient of concrete, L is the length of the span, and ΔT is the temperature increase in Celsius.

We know that the length of the span is 180 m, and the temperature increase is 20°C. Substituting these values into the equation, we get:

ΔL = 3.5 × [tex]10^{-5[/tex] * 180 m * 20°C

= 4,500 m

To find the height to which the spans rise when they buckle, we need to know the shape of the buckling and the distance between the supports.

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