the floor of a railroad flatcar is loaded with loose crates having a coefficient of static friction of 0.33 with the floor. if the train is initially moving at a speed of 40 km/h, in how short a distance can the train be stopped at constant acceleration without causing the crates to slide over the floor?

Suppose our sun suddenly becomes a black hole (a very hypothetical situation, and our sun will not end its life as black hole). Planets would also mugged up by the gravitational pull of black hole i.e. sun black hole.

A black hole is an area of spacetime where gravity is so intense that no electromagnetic wave, not even light, has the energy to escape. According to general relativity theory, a compact enough mass can bend spacetime into a black hole. The event horizon is the line beyond which there is no escape. Despite having a significant impact on the outcome and circumstances of an object traversing it, general relativity states that it lacks any locally observable characteristics.  A black hole behaves in many ways like a perfect black body since it does not reflect light.  Furthermore, event horizons are expected to release Hawking radiation according to the quantum field theory in curved spacetime. When large stars end their lives and collapse, black holes of stellar mass are created. A black hole can expand by absorbing mass from its surroundings after it has created. It is possible for supermassive black holes to absorb additional stars and merge with other black holes to produce masses of millions of solar masses (M). Most galaxies' centers are believed to contain supermassive black holes. Through its interactions with other stuff and electromagnetic radiation like visible light, black holes can be detected.

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As the speed of the spaceship increases, we, as passengers, would notice that the length of your spaceship does not change.

Astronauts do not notice their speed any more than do passengers on a commercial aircraft once they are traveling in orbit at a constant speed of roughly 16,150 mph (26,000 kph). A spaceship is a form of artificial satellite used for a wide range of tasks such as communications, Earth observation, meteorology, navigation, space colonization, planetary exploration, and cargo and person transfer. All spacecraft, with the exception of single-stage-to-orbit rockets, require a launch vehicle to enter space (carrier rocket).

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The calculated answer is 196 N. The 2 kg block applies a typical response force of 16 N to the 3 kg block.

Newton's second law of motion states that the force applied by an object equals its mass times its acceleration: F = m ⨉ a. To apply this formula, you must use SI units for force (newtons), mass (kilograms), and acceleration (meters per second squared). Multiply the block's height and breadth to find its area. By the block area, divide your wall space. It is determined by multiplying the force's intensity by the distance the object moves in the force's direction.

F = mg = (20 kg)(9.8 m/s2)

= 196 N

in the aforementioned case, and

W = (196 N)(1.5 m)

= 294 Nm.

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The height h=0.369cm of mercury in the right side of the U-tube.

As per the data given in the above question are as bellow,

Air flows through this tube at a rate of [tex]1100 cm^3/s[/tex]

Air is an ideal fluid.

Use the bernouli's equation, we get

[tex]p_1+\frac{1}{2} \rho v_1^2 & =p_2+\frac{1}{2} \rho v_2^2 \\p_1-p_2 & =\frac{1}{2} \rho\left(v_1^2-v_2^2\right)[/tex]

Use the continuity equation:

[tex]A_1 v_1 & =A_2 v_2 \\v_1 & =\frac{A_2 v_2}{A_1} \\& =\frac{A_2 v_2}{\pi\left(\frac{r_1}{2}\right)^2}[/tex]

That the rate of in the tube is

[tex]A_1 v_1=A_2 v_2=1100 \mathrm{~cm}^3 / \mathrm{s}[/tex]

Substitute the numerical value in the above equation we get

[tex]v_1 & =\frac{1100 \mathrm{~cm}^3 / \mathrm{s}}{\pi\left(\frac{2.0 \mathrm{~cm}}{2}\right)^2} \\& =350.14 \mathrm{~cm} / \mathrm{s} \\& =3.50 \mathrm{~m} / \mathrm{s}[/tex]

Similarly,

[tex]v_2 & =\frac{A_1 v_1}{A_2} \\& =\frac{1100 \mathrm{~cm}^3 / \mathrm{s}}{\pi\left(\frac{4.0 \mathrm{~mm}}{2}\right)^2} \\& =\frac{1100 \mathrm{~cm}^3 / \mathrm{s}}{\pi(0.2 \mathrm{~cm})^2} \\& =8753.5 \mathrm{~cm} / \mathrm{s} \\& =87.5 \mathrm{~m} / \mathrm{s}[/tex]

The pressure difference in the u shaped tube is

[tex]p_1-p_2=\rho^{\prime} g h[/tex]

Here, [tex]$\rho^{\prime}$[/tex] is the density of mercury.

From the above equation we get

[tex]h & =\frac{p_1-p_2}{\rho^{\prime} g} \\& =\frac{\frac{1}{2} \rho\left(v_1^2-v_2^2\right)}{\rho^{\prime} g} \quad\left(\text { Since } p_1-p_2=\frac{1}{2} \rho\left(v_1^2-v_2^2\right)\right)[/tex]

Substitute the numerical values in the above equation we get

[tex]h & =\frac{\frac{1}{2} \rho\left(v_1^2-v_2^2\right)}{\rho^{\prime} g} \\& =\frac{\frac{1}{2}\left(1.29 \mathrm{~kg} / \mathrm{m}^3\right)\left((87.5 \mathrm{~m} / \mathrm{s})^2-(3.50 \mathrm{~m} / \mathrm{s})^2\right)}{\left(13.6 \times 10^3 \mathrm{~kg} / \mathrm{m}^3\right)\left(9.8 \mathrm{~m} / \mathrm{s}^2\right)} \\& =0.0369 \mathrm{~m} \\& =0.0369 \mathrm{~m}\left(\frac{1 \mathrm{~cm}}{10^{-2} \mathrm{~m}}\right) \\[/tex]

=0.369cm

Height is 0.369cm

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Note:- The correct question could be as follow,

Air flows through this tube at a rate of 1100 cm3/s . assume that air is an ideal fluid.

What is the height h of mercury in the right side of the U-tube?

The change in heat  for the aluminum cup is 141.19 Joule.

The amount of heat needed to raise a substance's temperature by one degree Celsius per gram is known as its specific heat. Typically, calories or joules per gram  per degree Celsius are used as the units of specific heat.

Given that: mass of the aluminum cup: m = 31.91 g

Initial temperature: t = 21.2° C.

Final temperature: T = 26.1° C.

specific heat of aluminum: s = 0.903 J/g/° C.

Hence, the change in heat for the aluminum cup = ms (T-t)

= 31.91 g × 0.903 J/kg/° C × ( 26.1° C - 21.2° C)

= 141.19 Joule.

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A foot ladder is resting in a wall and start slipping along the wall at a rate of m/sec. Along the diameter of the ladder, fast is the based of the ladder moving away from the wall when the ladder is at the high meters.

Velocity is the direction at which an object is moving and serves as a measure of the rate at which its position is changing as seen from a specific point of view and as measured by a specific unit of time (for example, 60 km/h northbound). In kinematics, the area of classical mechanics that deals with the motion of bodies, velocity is a fundamental idea. A physical vector quantity called velocity must have both a magnitude and a direction in order to be defined. Speed is the scalar absolute value (magnitude) of velocity; it is a coherent derived unit whose quantity is measured in metres per second (m/s or m/s1) in the SI (metric system). In order to stress the difference between the instantaneous velocity and average velocity, velocity is defined as the rate of change of location with regard to time. The average velocity of an object, or the constant velocity that would produce the same resultant displacement as a variable velocity in the same time interval, v(t), over some time period t, may be required in various applications. Always, an object's average velocity is less than or equal to its average speed.

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A series connection is made between four inductors, each of which has an inductance of 0.6 h. so the circuit's overall inductance is 2.4h.

Since the current change through each coil is the same, the inductance of inductors that are connected in series is computed as the sum of the individual inductances of each coil. L di/dt = V. Accordingly, the individual inductances of each inductor are added to determine the overall inductance of the series connection.

Let the four inductors be L1 = L2= L3= L4 = 0.6h

Given that inductance of each inductor = 0.6h

We are aware that LTotal = L1 + L2 + L3 +... + Ln is the formula for the total inductance of a series.

LTotal = L1+L2+L3+L4 = 0.6+0.6+0.6+0.6 = 2.4h is the total inductance.

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The process of distillation involves selectively boiling and condensing to separate the volatile components of a liquid mixture.

Since the bulb of the thermometer is in contact with both the vapour and liquid that are entering the condenser, a higher temperature will be recorded if it is situated below the opening to the condenser than if it is put close to the aperture.

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The speed changes as a result of the energy being transferred into a container filled with magnetic marbles and the kinetic energy produced by the container's gentle shaking. Phase shifts will result from this.

The energy of a system changes together with each phase change it undergoes. These involve kinetic energy transmission to a system. Endothermic reactions occur when a condition changes from being more ordered to being less ordered. Exothermic reactions are always involved in transitions from one state to another that is more organised.

When a substance transforms from one state to another, a phase change occurs in the system. When the system receives enough energy or loses enough energy, these changes take place. Phase changes also happen when the system's pressure is altered.

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Complete Question:

Describe how does transferring energy into a container of magnetic marbles affect the speed by shaking the container gently?

A force of 20 n causes a spring to stretch 5 cm. The spring constant is 400 N/m. So the correct option is (c) 400 N/m.

The spring constant is a measure of how much force is required to stretch the spring a certain distance. To calculate the spring constant, we must use the equation F = kx, where F is the applied force, k is the spring constant, and x is the distance the spring is stretched.

In this problem, we are given the applied force (F) of 20 N and the distance the spring is stretched (x) of 5 cm. To solve, we can rearrange the equation to solve for k:

k = F/x

k = 20 N/5 cm

k = 4 N/cm

We can also express this in newtons per meter (N/m) by multiplying by 100 to convert cm to m:

k = 400 N/m

Therefore, the spring constant is 400 N/m.

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The molar mass of the compound will be 123 g/mole

The ratio between the mass and the amount of substance in any sample of a chemical compound is known as the molar mass in chemistry.

How to determine a compound's molar mass

Calculate the number of atoms in each element in the compound using the chemical formula.

Add up the atomic weights of all the elements in the complex and multiply the result.

Calculate the total and convert it to grams per mole.

Change in freezing point, [tex]\delta T_f = K_f \times m[/tex]

where Kf=Cryoscopic constant=5.12 degree C for Benzene

m=molality

[tex]\delta T_f=5.53-4.92=0.61[/tex] degree C

[tex]m=\frac{\detlaT_f}{K_f}=\frac{0.61}{5.12}=0.119[/tex] mol/kg

Molality=wt(solute)/(MW(solute)*kg of solvent)

[tex]0.119=\frac{1.10}{(MW \times 0.07522)}\\\\MW=123\:g/mol[/tex]

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The complete question should be:

1.10 g of an unknown compound reduces the freezing point of 75.22 g benzene from 5.53 to 4.92 ºC. What is the molar mass of the compound?

10.2 m/s is the initial speed of an arrow as it is launched straight up into the air. The arrow will be heading downward at a speed of 5.8 m/s after 1.63s

The arrow's steady downward acceleration once it leaves the bow is equivalent to the g of free fall. The amount of time needed for the velocity to change from an initial value of 10.2 m/s, assuming that upward is the positive direction

Given initial speed of arrow (u) = 10.2m/s

Final speed of arrow (v) = -5.8m/s (opposite in direction)

Since going downward gravity acts upon the arrow (g) = 9.8m/s

where g is the gravitational acceleration

time taken to move downward = t

We know that t = v-u/a = v-u/g

t = -5.8-10.2/-9.8 = -16/-9.8 = 1.63s

Hence time taken for the arrow to move downward is 1.63s

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Answer:

False

Explanation:

The wavelength of red light is greater than blue light.  Its energy is less.

Both statements are false.    Search for a graphic of the "electromagnetic spectrum."  Many will note the wavelengths of the various regions (IR, UV, Visible, Microwave, etc.  Observe the relationships.  Red has less energy than blue.  That sounds counterintuitive, based on artist's use of red to connote fire or some energetic situation.  But the red in a fire obscures human vision to the blues and UV radiation from the same source.  A welder uses a UV shield to blocjk these wavelengths, to avoid eye damage.

Risks. Sunburn is a sign of short-term overexposure, while premature aging and skin cancer are side effects of prolonged UV exposure.

Risks. Premature ageing and skin cancer are side consequences of continuous UV exposure, whereas sunburn is a symptom of short-term overexposure. If eye protection is not used, UV exposure raises the risk of potentially blinding eye illnesses. UV radiation overexposure can cause major health problems, including cancer.

The amount of UV radiation is unrelated to the temperature. The position of the sun in the sky is mostly to blame for variations in UV levels between summer and winter. UV radiation is often impacted by changes in the stratospheric ozone and global climate change. More UVB (the higher-frequency, more dangerous kind of UV) may now reach the Earth's surface due to a decrease in stratospheric ozone.

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A force of 45 n used, The actual mechanical advantage of the ramp is 2.18.

Weight = 10g

            = 10 × 9.81

            = 98.10N

Force used = 45 N

Mechanical advantage = Height / Force used = 98.1/45 = 2.18

The inverse relationship between acceleration and mass is stated by Newton's second law, which also states that force and acceleration are directly proportionate. By using kinematic measurements, accelerations can be identified. The correct definition of mass is still a contentious issue, despite the fact that modern physics' reference frame analysis provides a comprehensive description of kinematics. It is not apparent how or not this link holds true on microscales because general relativity provides an equivalency between space-time and mass in the absence of a cogent theory of quantum gravity. By expressing Newton's second rule as an equality, the relative units of force and mass may be determined and the law can be interpreted as a quantitative description of mass.

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Stone is dropped from the edge of a roof, and hits the ground with a velocity of -165 feet per second. 165 feet high is the roof.

Velocity is the direction at which an object is moving and serves as a measure of the rate at which its position is changing as seen from a specific point of view and as measured by a specific unit of time (for example, 60 km/h northbound). In kinematics, the area of classical mechanics that deals with the motion of bodies, velocity is a fundamental idea. A physical vector quantity called velocity must have both a magnitude and a direction in order to be defined. Speed is the scalar absolute value (magnitude) of velocity; it is a coherent derived unit whose quantity is measured in metres per second (m/s or m/s1) in the SI (metric system). In contrast to "5 meters per second east," which is a vector, "5 meters per second," for instance, is a scalar. In order to stress the difference between the instantaneous velocity and average velocity, velocity is defined as the rate of change of location with regard to time. The average velocity of an object, or the constant velocity that would produce the same resultant displacement as a variable velocity in the same time interval, v(t), over some time period t, may be required in various applications.

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Because Venus changes phases just like our Moon, it therefore orbits its light source (the Sun). support Copernican theory. constructed the telescope in 1609.

Galileo turned his gaze to Venus, the brightest object in the sky aside from the Sun and Moon. By observing the phases of Venus, Galileo was able to ascertain that Venus orbited the Sun, and not the Earth, as was commonly believed at the time.

Galileo was curious about the Sun and used his telescope to study it in detail. Galileo pointed his telescope at the Sun, unaware that looking at his own stars would impair his eyesight. He discovered that the Sun has sunspots that appear dark in color.

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If the surface temperature of the sun were to drop by a factor of 2.0, the power impinging on the earth would decrease by a factor of 8 times.

The quantity of energy transferred or transformed per unit of time is known as power. It is a mechanically accepted quantity. The watt, or one joule per second, is the unit of power in the International System of Units. Power is also referred to as activity in ancient writings. A scalar quantity is power. Power is related to other factors; for instance, the power required to move a ground vehicle is equal to the product of the vehicle's velocity, traction force on its wheels, and aerodynamic drag. A motor's output power is calculated by multiplying its torque output by the angular velocity of its output shaft. Energy divided by time represents the dimension of power. The watt (W), which equates to one joule per second, is the unit of power in the International System of Units (SI). Another popular unit of measurement is horsepower (hp), which is equivalent to a horse's power; one mechanical horsepower is equal to around 745.7 watts. Ergs per second (erg/s), foot-pounds per minute (fpm), dBm (a logarithmic measurement in relation to 1 milliwatt), calories per hour (cal/h), BTU per hour (BTU/h), and tons of refrigeration are other units of power.

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Answer:

0.45 m/s²

Explanation:

Fnet = 55N - 10N = 45N

Force of friction is in opposite direction of the applied force.

a = Fnet/m = 45N/100 kg = 0.45 m/s²

The empirical formula is CHO.

Maleic acid generates 1.599g of CO2 and 0.327g of H2O from a sample of 1.054 g.

So, use molar masses to calculate mass.

1.599 grams of [tex]CO_2[/tex] at (12.01 grams of carbon)/(44.01 grams of carbon) = 0.436 grams of carbon

0.037 grams of hydrogen are equal to 0.327g of H2O at (2.016 g Hydrogen) / (18.01 g/mol H2O).

1.054 g sample divided by 0.436 g of carbon and 0.037 g of hydrogen yields 0.581 g of oxygen.

Now locate moles by using molar masses.

0.436 grams of carbon with a molecular weight of 12.01 = 0.0363 mol C

0.0367 mol H for 0.037 grams of hydrogen and 0.0363 mol O for 0.581 grams of oxygen

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The complete question should be:

In combustion analysis, a 1.054-g sample of maleic acid yields 1.599g of CO29 and 0.327g of H20.

When 0.609g of maleic acid dissolved in 25.00g of glacial acetic acid, the freezing point drops by 0.82 degrees C Maleic acid does not ionize in glacial acidic acid, which has a freezing point depression constant of Kf=3.90*c/m.

In a titration experiment, a 0.4250-g sample of maleic acid is dissolved in water and requires 34.03ml of 0.2152 M KOH for its complete neutralization.

The pH of 0.215g of maleic acid in 50.00mL of the aqueous solution is found to be 1.80.

Determine the empirical formula for maleic acid. Enter the atoms in order of C, H, and O.

The diameter is increasing at a rate of [tex]\frac{1}{200\pi }[/tex]cm/g

We know the volume of the balloon is increasing at a rate of 100cm3/s

This is expressed as:

[tex]\frac{dv}{dt} =100[/tex]-----(1)

The volume of a sphere is given by:4/3πr^3

The formula gives volume in terms of the radius, not the diameter, so we will halve the diameter to get the radius.

Radius = 100:

We need to find:[tex]\frac{dr}{dt}[/tex]

Since we don't have t in our equation, we will be differentiating implicitly. We can use the chain rule for this:

[tex]\frac{dV}{dt} =\frac{dV}{dr} .\frac{dr}{dt}[/tex]--------(2)

We already know [tex]\frac{dV}{dt} =100[/tex]

             100=dV/dr.dr/dt

To find dV/dr we differentiate :

V=4/3πr3

dV/dr(4/3πr3)

=4πr2

∴100=4πr2⋅dr/dt

Dividing:

100/4πr2=dr/dt

The radius is 100, so:

100/4π(100)2=dr/dt

dr/dt=1/400π

We need the diameter, so:

2⋅1/400π=1/200π

Thus, The diameter is increasing at a rate of 1/200πcm/s.

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Energy from the sun sets in motion extraordinary interactions between the atmosphere, In option C In conclusion, organisms and minerals, energy from the earth's core profoundly affects the shape of the ground we walk on.

C In conclusion is the best option to use in this sentence. This is because the sentence presents a summary or conclusion of the information that has been presented in the paragraph or passage. The phrase "In conclusion" signals to the reader that the author is wrapping up their thoughts on the topic and is a common way to signal the end of a presentation or discussion.

Option A "Consequently" could also be a good choice if the preceding information discussed the consequences or results of the interactions between the atmosphere, organisms, minerals, and energy from the earth's core.

Option B "Meanwhile" would not be a good choice because it suggests that there is some kind of parallel or contrasting action occurring at the same time, which is not the case in this sentence.

Lastly, Option D "For example" would not be a good choice because it introduces an example to illustrate a point, but the sentence does not present an example.

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As you get closer, the frequency of the sound gets higher. Because the sound waves are compressed relative to you, the frequency increases.

The Doppler effect can be described as a phenomenon that is observed whenever the source waves are moving w.r.t. an observer. Doppler effect can be defined as the change in the frequency of sound as the source and observer move toward or away from each other.

The Doppler effect can be used to describe when a moving source with respect to an observer, changes in the frequency of any sound produced.

Sound Waves that are emitted by an orchestra traveling toward you get compressed while the waves emitted by an orchestra traveling away from an observer get stretched out.

Therefore, the frequency of the sound of the orchestra gets higher, if you quickly run toward the orchestra.

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Answer:

true

Explanation:

The object will always accelerate if it has an unbalanced force acting on it in that direction

The figure (4) is said to be in equilibrium with the force 2F in the centre and F on the top and bottom of the hockey puck.

For a body to be in equilibrium, the net force acting on the body and the net moment acting on the body must be zero.

Let us consider the net force acting on the body of pucks (force toward positive direction is positive and force towards negative direction is negative).

For puck 1, net force = 3F - F -2F = 0

For puck 2, net force = 2F + F - F = 2F

For puck 3, net force = F + 2F - F = 2F

For puck 4, net force = F + F - 2F = 0

For puck 5, net force = 3F - F - 2F = 0

In puck 1 and puck 5, net torque about the centre mass is not zero.

In puck 4, net torque about the centre mass is zero.

Thus, puck 4 is said to be in equilibrium.

The question is incomplete. The figure is missing in the question. It is attached in the below attachment.

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Answer: A boat in the trough of a wave takes 3 seconds to reach the highest peak of the wave, then its wavelength will be equal to 30 m.

Explanation:

The wavelength of the wave is 15 m.

The wavelength of a wave is the distance between two consecutive crests or troughs. The velocity of a wave is the speed at which it travels. The time it takes for a boat to travel from the trough of a wave to the highest point of the wave is the same as the time it takes for the wave to travel one wavelength.

In this case, the velocity of the wave is 5 m/s and the time it takes for the boat to travel from the trough of the wave to the highest point is 3 s.

wavelength = velocity * time

wavelength = 5 m/s * 3 s = 15 m

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The moment of inertia of the point is from to be 0.0045 Kg-m².

The moment of inertia of any mass that is situated away from the axis of the rotation is given by other relation,

I = MR²

Where,

M is the mass of the body and R is the distance of the body from the axis rotation.

It is given to as that the mass of the body is 0.05 grams and it is situated perpendicularly at a distance of 3 m from the axis of rotation.

Now, putting all the values to find the value of the moment of inertia,

I = 0.0005×9

I = 0.0045 Kg-m²

So, the moment of inertia the point is found to be 0.0045 Kg-m².

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(a)The greatest upward acceleration of the elevator with 1200 kg mass and specified maximum tension is 11.67 m/s².

(b) The greatest downward acceleration is 9.8 m/s².

(a) Given that,

Mass of the elevator = 1200 kg

Tension = 14000 N

Acceleration is the pace at which the speed and direction of a moving object alter over time.

We know the formula to calculate force as, F = m* a

Making a as subject, we have a = F /m

Putting the values in the equation,

a = F /m = 14000/1200 = 11.67 m/s²

Hence, the upward acceleration of the system is 11.67 m/s²

(b) The greatest downward acceleration is nothing but the acceleration due to gravity.

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p(1 - p) value can be a maximum of 0.5. A p-value is nothing but a probability value which is a numerical representation of likelihood.

The likelihood that the null hypothesis is true is represented by the p-value. The possibility that the alternative hypothesis is accurate is (1 - p value). Replicable outcomes are indicated by a low p-value. A large effect or a significant result with significant theoretical, clinical, or practical implications are indicated by a low p-value.

A statistical test employing your data is used to determine the likelihood of your test statistic, which is the result of the test.

A p-value of 0.05 or less (usually 0.05) indicates statistical significance. Strong evidence is presented against the null hypothesis.

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The momentum is p = m v . You can see from the equation that momentum is at once proportional to the object's mass (m) and velocity (v).

Therefore, the extra an object's mass or the extra its velocity, the extra its momentum.From equation (1), whilst the common velocity of the fueloline is increased, the momentum of the fueloline will growth too.

This will make the stress exerted via way of means of the fueloline will increase too. And, whilst the quantity of the molecules is increased, this could growth the full mass of the fueloline and the momentum of the fueloline will growth too.

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