A tree is turned into sawdust is that physical change or chemical change?

Velocity of the satellite that is orbiting earth is 83.45m/s, which makes the velocity of the rivet relative before striking also 83.45m/s and the time duration of collision is 4.53× 10⁻⁵ s. The avg force that is exerted by the rivet on the satellite is 9.27N and the energy that is generated by the collision is 1.63J.

a) Velocity of the satellite in an orbit 900 km above Earth's surface can be calculated as follows: Formula: `v = sqrt(GM/r)` Where,v = velocity, M = Mass of Earth, r = radius of the orbit (r = R + h)R = radius of the Earth = 6.37 × 10⁶ mh = height above Earth's surface = 900 km = 9 × 10⁵ mG = 6.67 × 10⁻¹¹ N m²/kg²By substituting the given values, we getv = sqrt((6.67 × 10⁻¹¹ × 5.97 × 10²⁴)/(6.37 × 10⁶ + 9 × 10⁵))= sqrt(6.965 × 10³) = 83.45 m/s.

Therefore, the velocity of the satellite in an orbit 900 km above Earth's surface is 83.45 m/s.

b) Velocity of the rivet relative to the satellite just before striking it can be calculated as follows: Velocity of the rivet, `v_rivet = v_satellite * sin(θ)`Where, v_satellite = 83.45 m/sθ = 90°By substituting the given values, we getv_rivet = 83.45 * sin 90°= 83.45 m/s.

Therefore, the velocity of the rivet relative to the satellite just before striking it is 83.45 m/s.

c) The time duration of collision, `Δt` can be calculated as follows:Δt = (2 * r_rivet)/v_rivet, Where,r_rivet = radius of the rivet = 3/2 × 10⁻³ m. By substituting the given values, we getΔt = (2 * 3/2 × 10⁻³)/83.45= 4.53 × 10⁻⁵ s.

Therefore, the time duration of collision is 4.53 × 10⁻⁵ s.

d) The average force exerted by the rivet on the satellite, `F` can be calculated as follows: F = m_rivet * Δv/ΔtWhere,m_rivet = mass of the rivet = 0.5 g = 0.5 × 10⁻³ kgΔv = change in velocity of the rivet = 83.45 m/sΔt = time duration of collision = 4.53 × 10⁻⁵ sBy substituting the given values, we get F = (0.5 × 10⁻³ * 83.45)/4.53 × 10⁻⁵= 9.27 N.

Therefore, the average force exerted by the rivet on the satellite is 9.27 N.

e) The energy generated by the collision, `E` can be calculated as follows: E = (1/2) * m_rivet * Δv²Where,m_rivet = mass of the rivet = 0.5 g = 0.5 × 10⁻³ kgΔv = change in velocity of the rivet = 83.45 m/s. By substituting the given values, we getE = (1/2) * 0.5 × 10⁻³ * 83.45²= 1.63 J.

Therefore, the energy generated by the collision is 1.63 J.

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Answer: A. An ice hockey player picks up a trophy as he slides past it

Explanation:

A PE X

The statement that best describes a perfectly inelastic collision is

C. A surfer falls off of his surfboard when a wave hits him.

A collision is the interaction between two bodies in such a way that the momentum and velocity of one body gets changed due to the presence of other body. There are three types of collision-

1. Elastic collision

2. Inelastic collision

3. Perfectly inelastic collision.

In all types of collision , the momentum of the system before collision and after collision always remains same or we can say that momentum is conserved in collisions

An elastic collision is the one in which kinetic energy is also conserved and coefficient of restitution is one. Both the bodies move separately with different velocities after elastic collision.

In inelastic collision  there is a loss of kinetic energy and coefficient of restitution is less than one.

In perfectly inelastic collision there is maximum loss of kinetic energy and coefficient of restitution is zero. Both the bodies stick together after collision and move with same velocity

Coefficient of restitution is the  ratio of  relative velocity of separation after collision to relative velocity of approach before collision.

A surfer falls of his surfboard when a wave hits him is an example of perfectly inelastic collision because in this when water hits the surfers he falls of and sticks to the water , and will also now move with the velocity of water .

So  when the surfer falls off his surfboard when a wave hits him is perfectly inelastic collision.

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The movement of charges from one plate to the other in a capacitor is a fundamental process that underlies many electronic devices and applications.

When a capacitor is connected to a circuit, charges begin to flow from one plate to the other until both plates reach the same potential and the capacitor becomes fully charged.

This process involves the movement of electrons, which are negatively charged particles, from one plate to the other.

Initially, the capacitor is uncharged, and the plates have an equal number of positive and negative charges.

When a voltage is applied to the capacitor, electrons begin to flow from the negative plate to the positive plate, creating an electric field between the two plates. This electric field stores energy in the capacitor, which can be released later when the capacitor is discharged.

If the voltage across the capacitor is removed, the capacitor will retain its charge and will discharge slowly over time as the electrons flow back from the negative plate to the positive plate.

This discharge process can be used in various applications, such as in flash photography, where a capacitor is charged rapidly and then discharged quickly to produce a bright flash of light.

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The gravitational acceleration of 3.30 m/s² is achieved at an altitude approximately 2,201,636 meters below the Earth's surface.

To determine the altitude above Earth's surface where the gravitational acceleration would be 3.30 m/s², we can use the formula for gravitational acceleration and take into account the radius of the Earth.

The formula for gravitational acceleration is:

g = G * (M / r²)

Where:

g is the gravitational acceleration,

G is the gravitational constant (approximately 6.67430 × 10⁻¹¹ m³/(kg·s²)),

M is the mass of the Earth, and

r is the distance between the object and the center of the Earth.

Given that the radius of the Earth (r) is 6370 km, we need to convert it to meters by multiplying by 1000:

r = 6370 km * 1000 = 6,370,000 meters

We can rearrange the formula to solve for r:

r = sqrt(G * M / g)

Now, let's substitute the known values into the formula:

r = sqrt((6.67430 × 10⁻¹¹ m³/(kg·s²)) * (5.972 × 10²⁴ kg) / (3.30 m/s²))

Calculating this equation gives us:

r ≈ 4,168,364 meters

Therefore, the altitude above Earth's surface where the gravitational acceleration would be 3.30 m/s² is approximately 4,168,364 meters or 4,168 kilometers.

To find the actual altitude from the Earth's surface, we subtract the Earth's radius from the calculated distance:

Altitude = r - Earth's radius

Altitude = 4,168,364 m - 6,370,000 m

Altitude ≈ -2,201,636 meters

The negative value indicates that the altitude is below the Earth's surface. In this case, it means that the gravitational acceleration of 3.30 m/s² is achieved at an altitude approximately 2,201,636 meters below the Earth's surface.

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The statement is not true. The statement "reading a 3-solar-mass black hole may be hidden between Jupiter and Saturn" is not true because it contradicts the laws of physics.

A black hole that has a mass of 3 solar masses cannot be hidden between Jupiter and Saturn as it would have been detected by astronomers. When a black hole passes by a star, it causes the star to move around the black hole due to the effect of gravity, which means that the presence of a black hole is detected by observing the motion of nearby stars. Since there are no such observations, the statement is not true.It is also worth noting that a black hole that has a mass of 3 solar masses is not small enough to be easily hidden from observation. Small black holes are easier to miss, but a black hole that has a mass of 3 solar masses would have a strong gravitational effect on nearby objects, which would make it detectable. Therefore, the statement is not true.

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The bullet takes 0.0025 seconds to pass through the wooden plank of 5 cm thickness when it is traveling horizontally with an initial speed of 30 m/s and a final speed of 10 m/s.

The time taken by the bullet to pass through the wooden plank can be determined using the equation of motion for constant acceleration.

Given:
Initial speed (u) = 30 m/s

Final speed (v) = 10 m/s

Distance (s) = 5 cm = 0.05 m

To find the time taken (t), we need to calculate the acceleration (a) first. We can use the equation:

v² = u² + 2as

Rearranging the equation, we have:

a = (v² - u²) / (2s)

Substituting the given values:

a = (10² - 30²) / (2 * 0.05)

Simplifying the expression:

a = (-800) / (0.1)

a = -8000 m/s²

The negative sign indicates that the acceleration is in the opposite direction of the initial velocity.

Next, we can use the equation of motion:

v = u + at

Substituting the values:

10 = 30 + (-8000) * t

Simplifying the equation:

-8000t = -20

Dividing by -8000:

t = 20 / 8000
t = 0.0025 s

Therefore, the time taken by the bullet to pass through the wooden plank of 5 cm thickness is 0.0025 seconds.


To find the time taken by the bullet to pass through the wooden plank, we need to calculate the acceleration first using the equation of motion.

By rearranging the equation and substituting the given values, we can find the acceleration.

Then, using the equation of motion again, we can solve for time.

The negative sign in the acceleration indicates that it is in the opposite direction of the initial velocity.

The resulting time is 0.0025 seconds.

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Answer:

In the first one circle : luster

second circle: atsuete seeds

third: dentures

Explanation:

Well I ain’t sure

Answer:

Zero

Explanation:

When it reaches max height, it stops and begins to fall back down....at this point the velocity = 0

Answer:

Balanced Forces

But what exactly is meant by the phrase unbalanced force? What is an unbalanced force? In pursuit of an answer, we will first consider a physics book at rest on a tabletop. There are two forces acting upon the book. One force - the Earth's gravitational pull - exerts a downward force. The other force - the push of the table on the book (sometimes referred to as a normal force) - pushes upward on the book.

Since these two forces are of equal magnitude and in opposite directions, they balance each other. The book is said to be at equilibrium. There is no unbalanced force acting upon the book and thus the book maintains its state of motion. When all the forces acting upon an object balance each other, the object will be at equilibrium; it will not accelerate.

Consider another example involving balanced forces - a person standing on the floor. There are two forces acting upon the person. The force of gravity exerts a downward force. The floor exerts an upward force.

Since these two forces are of equal magnitude and in opposite directions, they balance each other. The person is at equilibrium. There is no unbalanced force acting upon the person and thus the person maintains its state of motion.

Unbalanced Forces

Now consider a book sliding from left to right across a tabletop. Sometime in the prior history of the book, it may have been given a shove and set in motion from a rest position. Or perhaps it acquired its motion by sliding down an incline from an elevated position. Whatever the case, our focus is not upon the history of the book but rather upon the current situation of a book sliding to the right across a tabletop. The book is in motion and at the moment there is no one pushing it to the right. (Remember: a force is not needed to keep a moving object moving to the right.) The forces acting upon the book are shown below.

The force of gravity pulling downward and the force of the table pushing upwards on the book are of equal magnitude and opposite directions. These two forces balance each other. Yet there is no force present to balance the force of friction. As the book moves to the right, friction acts to the left to slow the book down. There is an unbalanced force; and as such, the book changes its state of motion. The book is not at equilibrium and subsequently accelerates. Unbalanced forces cause accelerations. In this case, the unbalanced force is directed opposite the book's motion and will cause it to slow down.

To determine if the forces acting upon an object are balanced or unbalanced, an analysis must first be conducted to determine what forces are acting upon the object and in what direction. If two individual forces are of equal magnitude and opposite direction, then the forces are said to be balanced. An object is said to be acted upon by an unbalanced force only when there is an individual force that is not being balanced by a force of equal magnitude and in the opposite direction.

When 400 nm light is incident normally on two slits separated by 0.025 mm, the fifth order maximum can be observed at an angle of approximately 0.028 degrees relative to the central maximum.

This can be calculated using the equation d sin θ = mλ, where d is the slit separation distance (0.025 mm), θ is the angle of observation, m is the order of the maximum (5th order), and λ is the wavelength of the light (400 nm).

Plugging in these values and solving for θ gives us approximately 0.028 degrees. It's important to note that this calculation assumes ideal conditions and does not take into account factors such as diffraction and interference, which can affect the exact location and intensity of the maxima.

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Condensation is the water on the outside of a cold cup of water on a hot day.

The US Supreme Court ruling that mandates people arrested receive certain rights is known as the Miranda Warning. This ruling requires that law enforcement officers inform the person being arrested of their right to remain silent and their right to an attorney.

These rights must be explained to the arrested person in clear and understandable language. The Miranda Warning was established in 1966 in the case of Miranda v. Arizona, and it has since become a crucial aspect of criminal procedure in the United States. The purpose of the Miranda Warning is to ensure that people who are being arrested understand their rights and are not coerced into making incriminating statements. The ruling has been the subject of ongoing debate and legal challenges, but it remains a cornerstone of the American justice system.

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Answer:

608

Explanation:

Trust me

Answer:

608

Explanation:

I only answer after making sure the answer is correct and I get the green tick, not the red cross (Acellus)

The position where the 49.0-kg object can be placed so as to experience a net force of zero from the other two objects is 1.32 m from the 400 kg mass toward the 100 kg mass.

(a) The formula for the gravitational force between two objects is given by:

F = Gm₁m₂ / r²where G is the gravitational constant, m₁ and m₂ are the masses of the objects, and r is the distance between them.

Using this formula, the magnitude of the gravitational force between the 100 kg and 49 kg object is:

F₁ = G(100 kg)(49 kg) / (2.20 m)²

   = (6.67 × 10⁻¹¹ N m²/kg²)(4900 kg²) / (4.84 m²)

   = 6.77 × 10⁻⁹ N

The magnitude of the gravitational force between the 400 kg and 49 kg object is:

F₂ = G(400 kg)(49 kg) / (2.20 m)²

   = (6.67 × 10⁻¹¹ N m²/kg²)(19600 kg²) / (4.84 m²)

   = 2.71 × 10⁻⁸ N

The net gravitational force exerted by these objects on the 49.0-kg object placed midway between them is the sum of these two forces:

Fnet = F₁ + F₂= (6.77 × 10⁻⁹ N) + (2.71 × 10⁻⁸ N)= 3.39 × 10⁻⁸ N

(b) To experience a net force of zero from the other two objects, the gravitational force exerted on the 49.0-kg object by the 100-kg object must be equal in magnitude and opposite in direction to the gravitational force exerted on the 49.0-kg object by the 400-kg object.

Using the formula for gravitational force, we can set up the following equation:

(6.67 × 10⁻¹¹ N m²/kg²)(100 kg)(49 kg) / (x + 4.4 m)² = (6.67 × 10⁻¹¹ N m²/kg²)(400 kg)(49 kg) / (x)²

Simplifying and solving for x gives: x = 1.32 m from the 400 kg mass toward the 100 kg mass

Thus, the position where the 49.0-kg object can be placed so as to experience a net force of zero from the other two objects is 1.32 m from the 400 kg mass toward the 100 kg mass.

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Answer: The particles of a solid are [generally] closest together while those of a gas are farthest apart

Explanation:

The true of an image produced by this mirror will be 2.5 times smaller and virtual. Option C is correct.

When light beams from an object reflect off a mirror, they intersect with the picture of that thing called an image. Real and virtual images are the two sorts of images.

The ratio of xi to xo for a certain mirror is 2.5;

\(\rm \frac{x_i}{x_0} =2.5 \\\ x_i=2.5 x_0\)

Where,

\(\rm x_0\) is the true of an image produced by this mirror.

The true of an image produced by this mirror will be 2.5 times smaller and virtual.

Hence,option C is correct.

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If the actual mass density of the universe is greater than the critical density and there is no dark energy, the universe would undergo a specific fate known as a closed universe or a "Big Crunch."

In a closed universe, the gravitational attraction between matter would eventually overcome the expansion of the universe, causing it to contract.

As the contraction progresses, the universe would become denser and hotter, eventually leading to the collapse and ultimate destruction of all matter and energy in a cosmic singularity.

This scenario is analogous to the reverse of the Big Bang, where the universe was extremely hot and dense at its inception.

In a closed universe without dark energy, the cosmic expansion would eventually reverse, leading to a contraction phase.

This outcome is contingent on the absence of a repulsive force (dark energy) that is currently believed to be responsible for the accelerated expansion of the universe.

It is important to note that current observational evidence supports the presence of dark energy, which suggests that the universe is undergoing accelerated expansion and a different fate is anticipated.

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d)A solar cell is an object that converts light into chemical energy.

It works by using sunlight to convert photons into electrons, which are then used to generate electricity. Solar cells can be used to power a variety of objects, such as calculators, phones, and other electronic devices. They can also be used to generate electricity for homes and businesses. Solar cells are made of special materials that allow them to capture light and convert it into energy. When sunlight hits the solar cell, electrons in the material become excited and move freely, creating an electric current. This current is then used to produce electricity.

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The net vertical force on the trailer is 0, while the net horizontal force on the trailer is 20,000 N to the right.

The net vertical force on the truck is 0, while the net horizontal force on the truck is 6,400 N to the right.

The given parameters;

the trailer:

the truck:

The net force on each vehicle is calculated as follows;

for the trailer:

Net vertical force is calculated as;

\(\Sigma F_y = 250, 000 \ N - 250,000 \ N = 0\)

Net horizontal force is calculated as;

\(\Sigma F_x = 20,000 \ N\)

for the truck;

Net vertical force is calculated as;

\(\Sigma F_y =80,000 \ N - \ 80,000 \ N = 0\)

Net horizontal force is calculated as;

\(\Sigma F_x = 26,400 \ N - \ 20,000 \ N = 6,400 \ N \ to \ the \ right\)

"Your question is not complete, it seems to be missing the following information;"

find the net force on each vehicle.

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Answer:

Answer would be South..

Answer:

They would attract one another

Explanation:

The interaction between two like-charged objects is repulsive. ... Positively charged objects and neutral objects attract each other negatively charged objects and neutral objects attract each other.

11.The time at 75° East longitude would be 1 hour and 20 minutes behind. 12.The time at 135° degrees East longitude would be 4 hours ahead. and 13. the time in Lima, Peru (15° South latitude, 75° West longitude) would also be 9:30 AM.

At 2:00 AM at 90° East longitude, the time at 75° East longitude would be 1 hour and 20 minutes behind. This is because for every 15 degrees of longitude, there is a time difference of approximately 1 hour. Since the two longitudes in question have a difference of 15 degrees, we can divide this by 15 to calculate the time difference.

If it is 8:00 PM at 15° East longitude, the time at 135° East longitude would be 4 hours ahead. Similarly, for every 15 degrees of longitude, there is an approximate time difference of 1 hour. Since the two longitudes in question have a difference of 120 degrees, we can divide this by 15 to calculate the time difference.

There is a 7-hour difference** between 105° West longitude and the Prime Meridian (0° longitude). The Prime Meridian, passing through Greenwich, England, serves as the reference point for determining time zones. As one moves westward from the Prime Meridian, each 15 degrees of longitude corresponds to a time difference of approximately 1 hour. Therefore, the time at 105° West longitude would be 7 hours behind the time at the Prime Meridian.

If it is 9:30 AM in New York (41° North latitude, 75° West longitude), the time in Lima, Peru (15° South latitude, 75° West longitude) would also be 9:30 AM. The latitude does not affect the time difference between the two locations. However, since both locations have the same longitude (75° West), they would experience the same local time. The time difference between different latitudes is primarily significant for determining time zones rather than the actual time within a specific time zone.

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Galileo Galilei astronomer designed scientific instruments, including a new kind of thermometer, an improved compass, and a more powerful telescope.

Study on planets, asteroids, and other celestial bodies is done by astronomers. They use both space- and ground-based technologies, including as telescopes like the Space Telescope Hubble. Some astronomers study distant galaxies as well as things such as pulsars and black holes.

Astronomy, atmospheric science, physics, and astrobiology, the study of space biology, are some of the scientific fields that are the most likely to lead to employment at Space agency. NASA uses 15 different types of scientists, demonstrating the significance of scientists from all specialities in space exploration.

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Answer:

velocity- the speed of something in a given direction.

Explanation:

acceleration- increase in the rate or speed of something.

Explanation:

because the molecules are closer together and more tightly bonded in solids

In the electromagnetic spectrum the greater the frequency the smaller the wavelength, then is the frequency is the lowest in the light spectrum the light will have the longest wavelength. Therefore, the answer is b.

Answer:

Mass, m = 16.02kg

Explanation:

Given the following data;

Force, F = 157N

Since it's a free fall, acceleration, a = g = 9.8m/s² (acceleration due to gravity).

To find the mass;

Force is given by the multiplication of mass and acceleration.

Mathematically, Force is;

\( F = ma\)

Where;

Making mass (m) the subject of formula, we have;

\(Mass (m) = \frac{F}{a}\)

Substituting into the equation;

\(Mass (m) = \frac{157}{9.8}\)

Mass, m = 16.02kg

Therefore, the mass of the rock is 16.02kg.