You are skateboarding at a speed of 9.04 m/s when you start to go down a hill. The change in height from the top of the hill to the bottom of the hill is 38.8 meters. Calculate how fast you will be going at the bottom of the hill in units of m/s. [Ignore any effects of friction and air resistance. Assume you are passively riding the skateboard (not pushing). The gravitational acceleration is 9.8 m/s2. ]

The static friction is 11N and kinetic friction is 8N  between a block of wood and a laboratory bench.

Static friction is a force opposing relative movement and it happens at the connection point between the bodies, yet additionally inside the bodies, as in the event of liquids. The idea of friction coefficient was first formed by Leonardo da Vinci. The extent of the coefficient of still up in the air by the properties of the surfaces, environmental elements, surface highlights, presence of the oil, and so on.

Kinetic friction is characterized as a force that demonstrations between moving surfaces. A body continuing on a superficial level encounters a force the other way of its development. The extent of the force will rely upon the coefficient of motor grinding between the two materials.

We know that static friction is the maximum force applied by the body,so here 11N is the maximum force,so static friction value will be 11N and kinetic friction value will be 8N.

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Answer: A negatively-charged ion always has more electrons than protons

Explanation:

First, we know that the elementary negative charge is the electron, while the positive one is the proton. Such that both have the same charge in magnitude, but a different sign. Such that if we have the same number of electrons and protons in an atom, the charge of this atom will be neutral.

And an ion is an atom with a different number of electrons and protons, so the charge of the atom is not neutral.

Then if we have a negatively-charged ion, the charge of this atom is negative. Then we must have a larger number of electrons (the negative ones) than protons (the positive ones)

Then the correct option is:

A negatively-charged ion always has more electrons than protons

The amount of heat transferred is also directly proportional to the mass. To cause an equivalent temperature change in a doubled mass, you need to add twice the heat.

Here we can se that ice having mass of 60 gram has initial temperature 20°C and final temperature 10°C and ice of mass 300 gram has initial temperature 20°C but final temperature of 7°C. So amount of heat transfer is more in ice of greater mass

Thermal energy is the term used to describe the energy present in a system that determines its temperature. The movement of thermal energy is heat. How heat is transmitted across various systems and how work is accomplished in the process is the subject of a large branch of physics called thermodynamics.

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The answers would be: 1) No, the Sun is only directly overhead at noon at this location on the summer solstice; 2) None of these options can be used to support the misconception; 3) In the Southern Hemisphere, particularly in Australia, it would be summer on the same day; and 4) No, stars are not located using latitude and longitude but rather by their coordinates of declination and right ascension.

1) The Sun is not directly overhead at noon every day at the location of the science center in the continental United States. It is only directly overhead at noon on the summer solstice, which typically occurs around June 21st.

2) None of the given options can be used to support the visitor's misconception about the seasons. The correct explanation for the seasons is the tilt of the Earth's axis, not the eccentricity of its orbit or the position of perihelion.

3) If the visitor wishes for it to be summer on the same day, you could inform them that in the Southern Hemisphere, particularly in countries like Australia, it is currently summer.

4) Stars do not have a latitude and longitude system like locations on Earth. They are located using coordinates of declination (similar to latitude) and right ascension (similar to longitude), which are measured in celestial coordinates. Constellations are used as reference points for identifying stars but do not represent their precise locations.

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The exact same.  gravity has no effect on mass.

Answer:

Explanation:

The mass of oil contained in the tank is 2400 kilograms.

To calculate the mass of oil contained in the tank, we need to determine the volume of oil first. The volume of the oil can be calculated using the formula:

Volume = Base Area × Height

Given:

Base Area = 2.5 square meters

Height = 1.2 meters

Volume = 2.5 m² × 1.2 m

Volume = 3 cubic meters

Next, we can calculate the mass of the oil using the formula:

Mass = Density × Volume

Given:

Density of oil = 800 kg/m³

Volume = 3 cubic meters

Mass = 800 kg/m³ × 3 m³

Mass = 2400 kilograms

Therefore, the mass of oil contained in the tank is 2400 kilograms.

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Answer:

C

Explanation

An object at rest will stay at rest.

Answer:

d = 8.45 m

Explanation:

Given that,

A basketball is dropped from top of the rim.

It takes 1.3s to fall.

We need to find the displacement of the basketball. Let the displacement is d. Using second equation of kinematics,

\(d=ut+\dfrac{1}{2}at^2\)

Where

u is the initial velocity, u = 0

a = g

So,

\(d=\dfrac{1}{2}\times 10\times 1.3^2\\\\d=8.45\ m\)

So, the displacement of the basketball is 8.45 m.

100 mph

Explanation:

Chetan is going 100 mph he hauling

The reciprocal of Hubble's constant for the balloon represents the age of the balloon since it started expanding.

Hubble's constant (H₀) is a measure of the expansion rate of the universe.

When we find the reciprocal of Hubble's constant (1/H₀), it gives us the time it took for the universe (or in this case, the balloon) to expand from a single point to its current size, assuming a constant expansion rate. In this context, the reciprocal of Hubble's constant represents the age of the balloon since the expansion began.
The reciprocal of Hubble's constant, when applied to the balloon, provides significant information about the age of the balloon and its expansion history, assuming a constant rate of expansion.

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Answer:

What I think that Jose's grandmother meant by saying that the bread was too dense is that she thinks the bread is too heavy or it can even mean to be too compacted in substance. The matter in the bread are close together and not spread out like in the air, when the matter in the air starts to come closer together it starts to make fog, because it is becoming more dense. Some more things that are heavy or dense are things like a big stereo speaker, an anvil, or even a big piece of wood used to build.

Explanation:

Answer:

•Walking briskly

• Running /jogging

•Dancing

•biking

Average acceleration when the particle completes half revolution​ is 18 m/s^2.

If you whirl a ball on the string over your head, then the ball is undergoing centripetal acceleration. If you drive a car around in circle, then your car is undergoing centripetal acceleration.

The average acceleration of a particle moving in a circular path is given by the formula: a = v^2/r, where v is the velocity of the particle and r is the radius of the circular path.

For the given particle, the velocity is 6 m/s and the radius is 2m. Therefore, the average acceleration is given by a = v^2/r = 6^2/2 = 18 m/s^2.

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The required correct answer is A - the type of materials the objects are made of.

The force of friction between two solid objects depends on various factors such as the smoothness of the surfaces in contact, the contact force between the objects, and the relative speed of the objects to each other. The force of friction arises due to the interlocking of surface irregularities between two solid objects in contact, which resists the relative motion between them. The smoother the surfaces, the less force is required to overcome the friction. Similarly, the force of friction increases with the contact force between the objects and the relative speed of the objects to each other. However, the type of materials the objects are made of does not affect the force of friction, as long as they are both solid and in contact. Thus, the force of friction is an important concept in physics, which has numerous applications in daily life.

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Answer:

In order to walk across the floor, you push backwards on the floor with your foot. Newton's Third Law says that the reaction force to this action force is "floor pushes you forward" (Action: You push floor (backwards). Reaction: floor pushes you (forward).) So, when you walk, it is the floor that pushes you along!

Explanation:

.

The angular displacement traveled in the first 6 seconds if the final angular speed is 20rad/s and with an angular acceleration of 5 rad /s² would be 90 radians.

There are three equations of motion given by  Newton

v = u + at

S = ut + 1/2×a×t²

v² - u² = 2×a×s

By using the second equation of motion given by Newton,

S = ut + 1/2at²

S = 0 + 0.5 × 5 × 6²

S = 90 radian

Thus, the total angular displacement would be 90 radians.

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The possible frequencies of the other tuning fork are 311 Hz and 289 Hz.

When two tuning forks are sounded together, they produce beats, which are periodic variations in sound intensity. The frequency of the beats is equal to the difference between the frequencies of the two tuning forks. In this case, the beat frequency is 11 beats per second.

To find the possible frequencies of the other tuning fork, we need to determine the frequency difference between the two tuning forks that can produce a beat frequency of 11 Hz. Since the given tuning fork has a frequency of 300 Hz, we can add or subtract the beat frequency from its frequency to find the other possible frequencies.

Adding 11 Hz to 300 Hz gives us 311 Hz, while subtracting 11 Hz from 300 Hz gives us 289 Hz. Therefore, the possible frequencies of the other tuning fork are 311 Hz and 289 Hz, depending on whether the beat frequency is produced by an increase or decrease in frequency.

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The possible frequencies of the other tuning fork are 311 Hz and 289 Hz.

When two tuning forks are sounded together, they produce beats, which are periodic variations in sound intensity. The frequency of the beats is equal to the difference between the frequencies of the two tuning forks. In this case, the beat frequency is 11 beats per second.

To find the possible frequencies of the other tuning fork, we need to determine the frequency difference between the two tuning forks that can produce a beat frequency of 11 Hz. Since the given tuning fork has a frequency of 300 Hz, we can add or subtract the beat frequency from its frequency to find the other possible frequencies.

Adding 11 Hz to 300 Hz gives us 311 Hz, while subtracting 11 Hz from 300 Hz gives us 289 Hz. Therefore, the possible frequencies of the other tuning fork are 311 Hz and 289 Hz, depending on whether the beat frequency is produced by an increase or decrease in frequency.

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Answer:

See below

Explanation:

The kinetic energy of the ball is = to the amount of work he did

  1/2 mv^2 = 1/2 * .5 kg * (6 m/s)^2  = 9 J

  1/2 ( .5)( 7.46)^2  - 9 =  4.9 j

The Pontential energy of the ball ( the height of the ball when launched) was converted to vertical velocity adding to the increase in velocity as it hit the floor....     so   AFTER it was launched  ...GRAVITY did the work.   ( It was actually Potential Energy created when the ball was lifted to launch height BEFORE launch)

Answer:

Precision: closeness of your measurements to each other

Accuracy: closeness of your measurements to a specific value

Hope this helps

Explanation:

The atmosphere protects life on Earth by filtering harmful UV radiation, regulating solar radiation and heat, shielding against cosmic rays and space debris, maintaining atmospheric pressure for respiration, and mitigating the impact of meteorological hazards.

Our atmosphere provides several key protections to life on Earth:

Ultraviolet (UV) Radiation: The atmosphere contains the ozone layer, which helps filter out a significant amount of harmful UV radiation from the Sun. UV radiation can cause skin damage, including sunburns and an increased risk of skin cancer.

Solar Radiation and Heat: The atmosphere absorbs and scatters a portion of the Sun's solar radiation, reducing the intensity of direct sunlight that reaches the Earth's surface. It helps regulate temperatures by trapping heat through the greenhouse effect, preventing extreme temperature fluctuations.

Cosmic Rays and Space Debris: The atmosphere acts as a shield against high-energy cosmic rays and most space debris, such as small meteoroids, by causing them to burn up or disintegrate upon entry. This protection prevents them from reaching the Earth's surface and causing potential harm.

Atmospheric Pressure: The atmosphere exerts pressure on the Earth's surface, creating a stable environment for life. It allows us to breathe comfortably by ensuring that air molecules are present at a sufficient density for respiration.

Protection from Meteorological Hazards: The atmosphere plays a crucial role in weather patterns, helping to distribute heat, moisture, and energy across the planet. It provides a buffer against extreme weather events like hurricanes, tornadoes, and severe storms, helping to mitigate their impact.

Therefore, our atmosphere serves as a protective barrier that shields us from various harmful external factors, maintaining a stable and habitable environment for life on Earth.

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Answer: the air exerts a force on the rudders, and the rudders will exert a force of equal magnitude and opposite direction on the boat causing the boat to start accelerating

Explanation:

The magnitude of the force is 1144.92  N.

How do you define force?

Physicists define force as:

Push or pull which when applied to an object having mass causes it to change its velocity in response to the push or pull.

The vector product of mass (m) and acceleration represents the amount of force (a).

Mathematically speaking, the force equation or formula can be written as follows:

                                                   F = ma

where m equals mass

a represents acceleration.

It is articulated either in Newton (N) or Kgm/s2.

As per Newtons second law of motion,

F=m×a

Given in the question,

Mass,  m=188   kg

Acceleration,  a=6.09  m/s2

Therefore,

F=188 x 6.09

F=1144.92  N

Hence, the magnitude of the force is 1144.92  N

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Answer:

a = -2.17 m / s²

Explanation:

In this problem you must ask for the acceleration of the elevator.

Let's use Newton's second law

           F-W = ma

           a =\(\frac{F}{m} - g\) F / m-g

the weight of the body is 900 N and the force is the reading of the scale, let's find the mass

         w = mg

         m = w / g

         m = 900 / 9.8

         m = 91.84 kg

let's calculate

         a = 700 / 91.84 - 9.8

         a = -2.17 m / s²

The negative sign indicates that the elevator is going down

The forces between polar molecules is known as dipole-dipole forces.

Dipole-dipole forces are a form of intermolecular force that occurs between molecules that have permanent dipoles as a result of the unequal sharing of electrons. They are usually found in polar molecules that are covalently bonded.

A permanent dipole is a separation of electric charge that exists across two adjacent atoms or atoms. These dipoles exist when atoms in a covalent bond share electrons in an unequal manner, resulting in a partially positive end and a partially negative end. This partial charge imbalance causes the neighboring molecules to experience a force that causes them to line up in a specific orientation. This kind of attraction is known as dipole-dipole forces.

A polar molecule is a molecule with a net dipole moment greater than zero due to the asymmetrical arrangement of polar bonds, or due to the presence of lone pair electrons on the central atom. Polar molecules are molecules that have partial charges or regions with varying charge densities. The electrons in polar molecules are not evenly distributed throughout the molecule, resulting in a region of partial negative charge and a region of partial positive charge.

Intermolecular forces are the forces that hold two molecules together. The forces that occur between molecules are referred to as intermolecular forces. They are usually much weaker than chemical bonds, which hold atoms within a molecule together.

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Answer:

FALSE

Explanation:

Velocity = speed with direction.

Think of speed and direction like rockets and missiles. Rockets are not smart. Missiles are smart. Rockets go in one direction. Missiles can track their targets, they have a specific destination, a specific direction.

Velocity is often used in physics, because its almost useless to know how fast an object is going if you don't know which direction it is going.

Think of it like this. If the Weather man told you a hurricane was traveling at 30 miles an hour, but didn't tell you which direction it was going, you would have no idea where to run, or if it was going to hit you at all. However, if he told you it was going 30 miles an hour to the North, and you were West of it, you would be fine, and wouldn't have to worry.

Answer:

70 km!

Explanation:

Hope this helps!

The potential energy lost by the ball is 353.16 J, if the mass of the ball is 1.2 kg and the height from which it drops is 30 m.

Actually energy lost is not scientifically correct to say here, because energy never lost or destroyed, rather it converts from one form to another. Potential energy does not get lost here, but it converts into kinetic energy or heat energy or both.

Potential energy is the energy possessed by an object due to its position relative to the other objects. Potential energy(P) is mathematically described as follows:

P = mgh

Where m is mass, g is acceleration due to gravity, and h is the height of the object. So,

P = 1.2 × 9.81 × 30

P = 353.16 Joules

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The mass of the other asteroid is approximately 1.3529 * 10¹⁵kg.The force of gravity between two objects can be calculated using Newton's Law

The force of gravity between two objects can be calculated using Newton's Law of Universal Gravitation, which states that the force of gravity is directly proportional to the product of the masses of the objects and inversely proportional to the square of the distance between their centers.
In this case, we are given that the force of gravity between the two asteroids is 1.14 N and the mass of one asteroid is 8 kg. We need to find the mass of the other asteroid.

Let's use the formula for gravitational force:

F = (G * m1 * m2) / r²

where F is the force of gravity, G is the gravitational constant (approximately 6.674 * 10⁻¹¹ N m²/kg²), m1 and m2 are the masses of the two objects, and r is the distance between their centers.

We can rearrange the formula to solve for the mass of the other asteroid (m2):

m2 = (F * r²) / (G * m1)

Substituting the given values into the equation:

m2 = (1.14 N * (75,000 m)²) / (6.674 * 10⁻¹¹  N m²/kg² * 8 kg)

Calculating the expression:

m2 ≈ 1.3529 * 10¹⁵ kg

Therefore, the mass of the other asteroid is approximately 1.3529 * 10¹⁵ kg.
Please note that the calculated value is an approximation and may vary depending on the exact values used. It is always important to verify the input values and units to ensure accurate calculations.
Answer: The mass of the other asteroid is approximately 1.3529 * 10¹⁵kg.

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Answer:

The trebuchet was invented in France and was first reported to be used in 1124AD in the siege of Tyre (in present-day Lebanon) during the Crusades. As it was much more powerful than a catapult, a trebuchet became the siege weapon of choice.

Explanation:

Most people think that the trebuchet is a medieval weapon, but actually, it has its origins in ancient China. The ancient Chinese trebuchet could throw huge boulders up to 250 pounds, a distance of 200 feet. In addition, it was lightweight and mobile which was crucial as it could be moved around the battlefield with ease. The thing I love about the chinese trebuchet is that it pushes the boundaries of ancient engineering to create a ballistics revolution - a flexible, portable, killing machine.

Answer:

Magnetism is one aspect of the combined electromagnetic force. It refers to physical phenomena arising from the force caused by magnets, objects that produce fields that attract or repel other objects.