A tow rope, parallel to the water, pulls a water skier directly behind the boat with constant velocity for a distance of 72 m before the skier falls. The tension on the rope is 140 N. a) Is the work done on the boat by the rope positive, negative, or zero? Explain. b) Calculate the work done by the rope on the boat.

Answer:

2.205 pounds

Explanation:

5.5 kg is 2.205 lbs. hope this helps!

Answer:

they would repel because they have the same charge. Charges that are different will stick together.

The law of conservation of matter and the law of conservation of energy essentially state that neither type of energy can be created nor destroyed, only transformed. The process by which grapes ferment to produce wine is an illustration of the law of conservation of matter. The amount of matter in the reactants in the bottle doesn't change, but its chemical form does.

It is a fundamental tenet of classical physics that matter cannot be created or destroyed in an isolated system; rather, it can only be changed from one form to another. This means that despite the apparent changes that are seen, no matter is lost during any chemical or physical change that may occur with any substance.

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Answer:

Structures are determined by two principal factors: the relative sizes of the ions and the ratio of the numbers of positive and negative ions in the compound.

Ionic compounds at a molecular level are arranged in definite patterns to give a crystalline structure leading to a high melting point, high boiling point and high density in ionic compounds.

In ionic bond is formed when a metal transfers electrons to a nonmetal and an ion pair is formed. The ions are held together by strong electrostatic interaction as described by Coulomb's law.

However, the smallest unit of an ionic substance is called the formula unit. The compound arranges itself in definite patterns to form a crystalline lattice. Hence, the structure of ionic compound is highly ordered. This leads to a high melting point, high boiling point and high density in ionic compounds.

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The term above which describes the amount of force exerted on a given area is pressure

However, pressure is derived quantity.

What are derived quantities?

Derived quantities are those quantities which are obtained from the combination of fundamental quantities either by addition, division or multiplication

In conclusion, the term above which describes the amount of force exerted on a given area is pressure

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Pressure is the term which describes the amount of force exerted on a given area and is denoted as option D.

This is described as the force per unit area of a substance and the unit is mmHg or pascal.

This is why pressure was chosen as the most appropriate choice in this type of scenario.

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Answer:

,

Explanation:

Answer:

Is

• speeding up while moving forward

An unbalanced force acting on an object results in the object's motion changing. The object may change its speed (speed up or slow down), or it may change its direction. Friction is a force that resists the motion or the tendency toward motion between two objects in contact with each other.

motion

Answer:

motion. FILLER FILLER FILLER

Answer:

The net force is 9.8ms2, but were you given the acceleration?

The gravitational force will decrease when we increase the distance between the objects and decrease the mass of both objects.

The factors affecting gravitational force are the masses of the objects and the distance separating the objects.

The gravitational force increases with increase in mass and decreases with increase in distance of separation and vice versa.

Therefore, the gravitational force will decrease when we increase the distance between the objects and decrease the mass of both objects.

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After six half-lives, 1/64th (or 0.015625) of the original sample of radioactive atoms remains.

A fraction of 1/64 of the radioactive atoms remains after six half-lives. This is because the rate of decay of a radioactive material is exponential, meaning that each half-life will reduce the amount of radioactive atoms by half. After 6 half-lives, the amount of radioactive atoms remaining is 1/2 multiplied by itself 6 times, which equals 1/64.

The fraction of radioactive atoms is the fraction of atoms in a sample that are unstable and decaying. This fraction can be determined by measuring the rate of decay of the sample over time. The fraction is usually expressed as a percentage, and it is related to the half-life of the sample, which is the time it takes for half of the atoms in the sample to decay.

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The distance covered by the truck would be 188.4 meters.

Initial velocity, u = 63 km/h = (63 x 1000 m) / (3600 s) = 17.5 m/s

Final velocity, v = 84 km/h = (84 x 1000 m) / (3600 s) = 23.3 m/s

We can use the equation:

v^2 = u^2 + 2as

where v is the final velocity, u is the initial velocity, a is the acceleration, s is the distance traveled.

Substituting the values we get:

(23.3)^2 = (17.5)^2 + 2(1.25)s

Simplifying and solving for s, we get:

s = [(23.3)^2 - (17.5)^2] / (2 x 1.25) = 188.4 meters (rounded to one decimal place)

Therefore, the truck travels a distance of 188.4 meters as it accelerates uniformly from 63 km/h to 84 km/h with an acceleration of 1.25 m/s^2.

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Answer:

b

Explanation:

Answer:

In order to create a new element you have to change the number of protons in a nucleus.

Answer:

yes it is a reactant

Answer: velocity

Explanation:

Slope of velocity time graph = acceleration. A change in velocity = a change in acceleration. A constant velocity would mean that there would be no acceleration.

Speed and velocity aren't the exact same thing. Speed is a scalar measurement while velocity is a vector measurement. The speed of an object could be different from its velocity (ex: speed CANNOT be negative while velocity can).

An object can have a constant speed but have a changing velocity.

Answer:

velocity

Explanation:

The definition of accelerate is a change in velocity, even if the speed doesn't, a change in velocity means acceleration.

Its total height is close to 33,500 feet (10,211 meters), which is significantly higher than Mount Everest, which is 29,029 feet (8,848 meters) above sea level and is the tallest mountain on earth (Chomolungma in Tibetan).

The Mahalangur Himal sub-range of the Himalayas is home to Mount Everest, which is the tallest mountain on Earth above sea level. Crossing its top point is the China-Nepal border. The Chinese and Nepali governments most recently established its elevation in 2020, at 8,848.86 m. A mountain summit in the Himalaya mountain range is Mount Everest. Between Nepal and Tibet, a Chinese autonomous region, it is situated. It is regarded as the highest point on Earth because it is 29,032 feet (8,849 meters) tall. George Everest, a former Surveyor General of India, was honoured with the mountain's naming in the nineteenth century. Mount Everest is thought to be between 50 and 60 million years old, according to National Geographic. Regarding the perception of "Mount Everest" in the public mind.

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Answer:

(a). The speed of the airplane is 78.53 m/s.

(b). The centripetal acceleration 1.234 m/s².

Explanation:

Given that,

Radius = 5000 m

Time = 400 second

We need to calculate the speed of the airplane

Using formula of speed

\(v=\dfrac{d}{t}\)

\(v= \dfrac{2\pi r}{t}\)

Put the value into the formula

\(v=\dfrac{2\times\pi\times5000}{400}\)

\(v=78.53\ m/s\)

We need to calculate the centripetal acceleration

Using formula formula

\(a=\dfrac{v^2}{r}\)

Put the value into the formula

\(a=\dfrac{78.53^2}{5000}\)

\(a=1.234\ m/s^2\)

Hence, (a). The speed of the airplane is 78.53 m/s.

(b). The centripetal acceleration 1.234 m/s².

Answer:

The  distance traveled by the ball before it lands in the other player's glove is 130.96 m.

Explanation:

Given;

angle of projection of the ball, θ = 40⁰

initial velocity of the ball, u = 36.1 m/s

The distance traveled by the ball before it lands in the other player's glove is the range of the projectile, calculated as follows;

\(R = \frac{u^2 sin(2\theta)}{g} \\\\R= \frac{36.1^2 \times sin(2\times 40)}{9.8} \\\\R = \frac{36.1^2 \times sin(80)}{9.8} \\\\R = 130.96 \ m\)

Therefore, the  distance traveled by the ball before it lands in the other player's glove is 130.96 m.

Answer:

Science and technology have had a major impact on society, and their impact is growing. By drastically changing our means of communication, the way we work, our housing, clothes, even the length, and quality of life itself, science has generated changes in the moral values and basic philosophies of mankind.

Explanation:

The time period of oscillations of a block hanging from a vertical spring can be found using the equation:

T = 2π√(m/k)

where T is the time period, m is the mass of the block, and k is the spring constant.

When the spring is stretched additionally from the new equilibrium, the displacement of the block increases. Let's denote this additional displacement as Δx.

The new effective spring constant, taking into account the additional displacement, can be calculated using Hooke's Law:

k' = k/Δx

Substituting this new effective spring constant into the equation for the time period, we have:

T = 2π√(m/k')

T = 2π√(m/(k/Δx))

T = 2π√(mΔx/k)

Therefore, the time period of oscillations when the spring is stretched additionally from the new equilibrium is given by 2π√(mΔx/k).

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When measuring from the left side, the locations where the resultant force is applied are Xa, Xb, Xc, Xd, Xe, and Xf.

To rank these six locations, we can use the following order: Xe < Xa = Xb < Xc < Xf < Xd.

The items can be ranked from smallest to largest as follows:Xe < Xa = Xb < Xc < Xf < Xd

To rank items as equivalent, we overlap them. For this problem, it was assumed that L was equal to 1 so that real numbers could be used. Xa and Xb were found to be the same locations as in 1/2 because they are rectangles. The centroid of a triangle is 1/3L from its peak, so Xc was said to be 1/3. Since the peak is on the right-hand side this time, Xd was determined to be 2/3.

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Elements are arranged in the periodic table based on various patterns. For example,  the element magnesium (Mg) A. has a higher atomic mass than the element sodium (Na). Option C is correct.

The known elements are arranged in the periodic table in increasing atomic number order and repeating chemical properties.

They are arranged in a tabular fashion, with each row denoting a certain era and each column denoting a particular group.

The elements are arranged in ascending atomic number sequence from top to bottom and left to right.

Elements belonging to the same group will have similar chemical properties because they will have the same valence electron configuration.

The periodic table's arrangement of elements follows a number of different patterns. For instance, sodium (Na) and magnesium (Mg) both have higher atomic masses (Na).

As a result, choice C is accurate.

Your question is incomplete but most probably your full question was Elements are arranged in the periodic table based on various patterns. For example, the element magnesium (Mg) has

a. a higher atomic mass than the element calcium (Ca).

b. has a lower atomic mass than the element beryllium (Be).

c. has a higher atomic mass than the element sodium (Na).

d. all of these

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An alternative way to explain Hubble's Law without relying on the standard Big Bang idea of a universe with no center and no edge is through the concept of a "tired light" hypothesis.

According to this hypothesis, the redshift observed in distant galaxies is not due to their motion away from us in an expanding universe, but rather the result of photons gradually losing energy as they travel through space.

In the tired light scenario, the wavelength of light is thought to stretch over time due to interactions with matter or other unknown processes. As a result, the light from distant galaxies appears redshifted, mimicking the effect of cosmic expansion. This explanation implies that the universe may have a finite size and a center, challenging the notion of an infinite and uniformly expanding universe.

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Answer:

10000 Bq / 625 Pq = 16

Radioactivity has decreased by a factor of 16

2^4 = 16

So the sample has gone thru 4 half-lives

24 da / 4 = 6 da

6 da is the half-life

Light phenomena can be better explained by a transverse wave model rather than a longitudinal wave model.

This is because light waves oscillate perpendicular to the direction of their propagation, which is the characteristic of a transverse wave. On the other hand, longitudinal waves oscillate parallel to their propagation direction, which is not the case for light waves.

Additionally, the behavior of light waves in different mediums, such as reflection and refraction, can be explained by the transverse wave model. When light waves hit a surface, they bounce off at the same angle they hit the surface, which is known as the law of reflection. Similarly, when light waves pass through a medium with a different refractive index, they bend or change direction, which is known as refraction. These phenomena can be explained using the wave nature of light and its transverse oscillations.

Therefore, it is safe to say that the transverse wave model is a better explanation for light phenomena than the longitudinal wave model.

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Light phenomena can be better explained by a transverse wave model rather than a longitudinal wave model. This is because light waves are known to have electric and magnetic fields that are perpendicular to each other and to the direction of the wave propagation.

This characteristic of light waves is consistent with the properties of transverse waves where the displacement of particles is perpendicular to the direction of wave propagation.

On the other hand, longitudinal waves have displacements that are parallel to the direction of wave propagation, which is not observed in light waves.

Therefore, the transverse wave model provides a more accurate explanation for the behavior of light waves.

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We are given the problem statement involving the collision between a bullet and a wooden block. We need to find the initial speed of the bullet.

We can use the law of conservation of momentum, which states that the total momentum before the collision is equal to the total momentum after the collision.

The conservation of momentum equation is given as: m1v1 + m2v2 = m1v1' + m2v2', where m1 and m2 are the masses of the bodies and v1, v2, v1', and v2' are their respective initial and final velocities.

Considering the given values, we have a 7.50 g bullet and a 1.50 kg wooden block. The initial velocity of the block is 0.

We need to find the initial velocity of the bullet, denoted as v.

Since the block is initially at rest, its initial momentum is zero. Therefore, the conservation of momentum equation becomes: (7.50 g) × v = (7.50 g + 1.50 kg) × v'.

Here, m1 = 7.50 g, m2 = 1.50 kg, v1 = v, v2 = 0, v1' = 0, and v2' = v'.

Next, we need to find the final velocity of the block, denoted as V'. We can use the equation of motion: v² = u² + 2as, where u is the initial velocity, s is the distance, and a is the acceleration.

In this case, the initial velocity of the block is 0, the distance traveled by the block is 0.650 m, and we can calculate the acceleration using the equation a = (v²) / (2s).

Simplifying the equation, we find v'² = av².

Substituting the given values, we have: 7.50 g × v = (7.50 g + 1.50 kg) × (√((0.650 m) × g × 2.67/7.50 g)), where g is the acceleration due to gravity (9.81 m/s²).

Solving the equation, we find v = 367 m/s as the initial speed of the bullet.

Finally, we need to determine the equation that correctly relates the four speeds in this problem.

Let the velocity of the bullet after the collision be v', and the velocity of the block after the collision be V'.

Given that the velocity of the block before the collision is 0, the equation that relates the speeds is v + V = v' - V'.

Therefore, the correct answer is option D, v + V = v' - V'.

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The maximum percentage of error in the measurement of X is 10%.

So, the correct option is (c) 10%.

To find the maximum percentage of error in the measurement of X, we need to determine how the errors in the measurements of A, B, C, and D affect the calculation of X.

Let's assume that X is calculated using the formula:

X = A + B - C × D

To find the maximum percentage of error in X, we need to consider the worst-case scenario where all the errors add up in the same direction.

Let's calculate the maximum percentage of error step by step:

Percentage error in A = 1%

Percentage error in B = 2%

Percentage error in C = 3%

Percentage error in D = 4%

To calculate the maximum percentage error in X, we'll add up the absolute values of the errors:

Maximum percentage error in X = |1%| + |2%| + |3%| + |4%|

= 1% + 2% + 3% + 4%

= 10%

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Type I supernovae occur when a star composed mainly of carbon and oxygen accretes matter from a companion star or merges with another white dwarf whereas Type II supernovae are the result of massive stars, containing hydrogen, that has exhausted their nuclear fuel.

Spectra show the difference between a Type I supernova and a Type II supernova by analyzing the elements present in each explosion.

Step 1: Observe the spectra of the supernovae. The spectra display the wavelengths of light emitted by the elements in the explosion.

Step 2: Identify the presence or absence of hydrogen. Type II supernovae have hydrogen lines in their spectra, whereas Type I supernovae do not.

Step 3: Analyze the elements present in Type I supernovae. Type I supernovae are further divided into subcategories based on their spectral lines. For example, Type Ia supernovae show strong silicon lines.

The difference arises due to the nature of the progenitor stars and the mechanisms causing the explosion.  When the mass reaches the critical limit, the star undergoes a thermonuclear explosion, resulting in a Type I supernova without hydrogen.

On the other hand, Type II The core collapses under its own gravity, causing a violent explosion that ejects the outer layers, including hydrogen, thus showing hydrogen lines in their spectra.

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