When a rubber cylinder is rubbed with a piece of wool, the cylinder accumulates a negative charge. what can be said about the charge on the wool? why?

Given that the angular speed of the 27-inch-diameter tire is 5π radians per second. We need to find out the speed at which the cyclist is traveling.

The formula that relates angular speed, linear speed and radius of rotation is given as:v = rωwhere,v is the linear speed,ω is the angular speed andr is the radius of rotation.Since the diameter of the tire is 27 inches, the radius is 27/2 = 13.5 inches = 1.125 feet.Substituting the values in the above formula,v = rωv = (1.125) × (5π)v = 5.625π

The speed at which the cyclist is traveling when his 27-inch-diameter tires are rotating at an angular speed of 5π radians per second is 5.625π feet per second.

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(a) The cost of electricity for one day is Rs. 42 .

(b) The cost of electricity for the month of January​ is Rs. 1,302.

The electric energy consumed in each is calculated as follows;

E = Pt

E = 60 x 6 = 360 Wh

E(total) = 8 x 360 Wh = 2880 Wh

The cost of Electricity is in kWh

2880 Wh = 2.8 kWh

C = 2.8 kWh x (Rs. 15)/kWh

C = Rs. 42

C = Rs.42 x 31

C = Rs. 1,302

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The ammeter will read the current as 1.67 A.

An ammeter is a device that measures the current through the conductor. The reading of the ammeter depends on the resistance and voltage. Resistance can be defined as the ratio of the voltage applied to the current flow It can be written as

R = V / I

where R is resistance, V is voltage and I is current.

From the question above, we know that

V = 10 V

r = 2 Ω

R = 4 Ω

Find the current by substituting the given parameters

V = I . ( R + r )

10 = I ( 4 + 2 )

10 = 6 I

I = 10 / 6

I = 1.67 A

Hence, the ammeter will read the following current.

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A falling object will continue to accelerate to higher speeds until they encounter an amount of air resistance that is equal to their weight.

Hope this helps!

Answer: (1a) The magnitude of the centripetal acceleration is 31.4 m/s^2, and the direction is towards the center of the circular motion.

(2a) The astronaut is experiencing 31.4 m/s^2 / 9.8 m/s^2 = 3.22 g's.

(3a) The torque needed to bring the centrifuge to a stop is (5500.0 kg * 31.4 m/s^2 * 20.0 m) = 3,420,000 N * m.

2:

(2a) The period of the pendulum's motion is 0.20 m / 0.10 m/s = 2.0 seconds, and the frequency is 1 / 2.0 s = 0.50 Hz.

(2b) The graphs of velocity and acceleration would be 0.5 seconds out of phase with the displacements shown.

(2c) The acceleration due to gravity on the surface of the planet is 0.10 m/s^2 / 9.8 m/s^2 = 1.02 g's.

Explanation:

if the universe is 13.8 billion years old, how can we see 46 billion light years away because space has also been expanding?

When total distance to distant cosmic objects like galaxies is taken into account, their measurement is referred to as cosmological distance. This distance accounts for universe's ongoing expansion. Space itself stretches as a result of the universe's expansion, causing two things' distances to grow even when they are not physically moving apart.

One may observe objects that are currently positioned farther distant than the age of the universe thanks to this stretching of space. For a very long time, light emanating from these far-off objects has been travelling through space. Light has essentially travelled a greater distance than the actual physical distance between us and the object because of the universe's expansion during that time.

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The evidence supporting the impact of an asteroid at the Cretaceous-Paleogene (K-Pg) boundary, also known as the KT boundary, is indeed strong.

The evidence supporting the impact of an asteroid at the Cretaceous-Paleogene (K-Pg) boundary, also known as the KT boundary, is indeed strong. The most notable piece of evidence is the discovery of a large impact crater called the Chicxulub crater in the Yucatan Peninsula of Mexico, dating back to approximately 66 million years ago. This impact event is believed to have had significant global consequences, including widespread environmental changes.

The extinction of the dinosaurs and many other species at the KT boundary is widely attributed to the asteroid impact. However, the exact mechanisms and the extent of the impact's role in the extinction event are still subjects of ongoing scientific investigation. While the asteroid impact is considered a major factor, other hypotheses and additional research areas are being explored to gain a comprehensive understanding of the extinction event. Some of these hypotheses include:

It's important to note that while the asteroid impact is considered a leading cause of the extinction event, other factors may have also played a role. Scientists continue to study and analyze various lines of evidence to refine our understanding of this significant event in Earth's history.

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Answer:

Koala, leopard, lion, cat, dog. Koala is an herbivore, leopard is a predator, lion is a predator, cat is a obligate carnivore, dogs are omnivores.

Explanation:

Newton's law of universal gravitation states that every particle in the universe attracts every other particle with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

Newton's Law of Universal Gravitation states that every object with mass attracts every other object with mass. The force between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers. The key equation for Newton's Law of Universal Gravitation is:
F = G * (m1 * m2) / r2.
where F is the gravitational force, G is the gravitational constant, m1, and m2 are the masses of the objects, and r is the distance between their centers.

This is a general law of physics derived from experimental observations, which Isaac Newton called inductive reasoning. It is part of classical mechanics and was developed in Newton's book Philosophiæ Naturalis Principia Mathematica ("Principles of Mathematics"), first published on July 5, 1687. When Newton presented Volume 1, he did not report to the Royal Society in April 1686. Robert Hooke claimed that Newton took the right back from him.

In modern language, the law states that each element of the group attracts all other elements of the group with a force acting along a line where the two elements intersect. The force is proportional to the product of the two groups and inversely proportional to the square of the distance between them.

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\(FeS_2\) is the limiting reactant and \(O_2\) is the excess reactant and 160.14 grams of \(SO_3\) are produced.

Given equation is: \(4FeS_2 + 15O_2 = 2Fe_2O_3 + 8SO_3\)

Calculating molar mass of \(FeS_2\), \(O_2\), \(Fe_2O_3\) and \(SO_3\)

We have: molar mass of \(FeS_2\) = 55.85 g/mole + 2(32.07 g/mole) = 119.99 g/mole

molar mass of \(O_2\) = 2(16.00 g/mole) = 32.00 g/mole

molar mass of \(Fe_2O_3\) = 2(55.85 g/mole) + 3(16.00 g/mole) = 159.69 g/mole

molar mass of \(SO_3\) = 3(16.00 g/mole) + 32.07 g/mole = 80.07 g/mole

We will use the balanced chemical equation to determine the limiting reactant: \(4FeS_2 + 15O_2 -- > 2Fe_2O_3 + 8SO_3\)

We will calculate the number of moles of each reactant.

moles of \(FeS_2\) = mass/molar mass = 20.0 g/119.99 g/mole = 0.1667 moles

moles of \(O_2\) = mass/molar mass = 16.0 g/32.00 g/mole = 0.5000 moles

According to the balanced equation, 4 moles of \(FeS_2\) react with 15 moles of \(O_2\) to produce 8 moles of \(SO_3\)

So, 1 mole of \(FeS_2\) reacts with (15/4) moles of \(O_2\) to produce (8/4) moles of \(SO_3\).

The balanced chemical equation tells us that the mole ratio of \(FeS_2\) to \(O_2\) is 4:15 and that of \(FeS_2\) to \(SO_3\) is 4:8 or 1:2.

The limiting reactant is \(FeS_2\) which means that it will react with 15/4 moles of \(O_2\) and produce 8/4 = 2 moles of \(SO_3\).

The number of moles of \(SO_3\) produced is given as follows:

moles of \(SO_3\) = 2 molg = moles × molar mass = 2 mol × 80.07 g/mol = 160.14 g

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A characteristic of an IPv4 loopback interface on a Cisco IOS router is that it is a virtual interface that is always up and does not require any physical connections.

The loopback Interface is an essential feature in network configurations. It is assigned a unique IP address from the IPv4 address space, typically in the 127.0.0.0/8 range, with 127.0.0.1 being the most commonly used address (known as the loopback address or localhost). The loopback interface allows a device to communicate with itself, regardless of the presence or status of other physical interfaces. The loopback interface has several benefits. Firstly, it provides a reliable and consistent testing environment for network applications and services, as it eliminates the dependency on physical connections. Secondly, it allows for simplified troubleshooting and debugging, as network engineers can test connectivity and perform diagnostics by sending traffic to the loopback address. Additionally, the loopback interface is often used for management purposes. It enables services like routing protocols, device monitoring, and virtual private network (VPN) termination, as these functions can be bound to the loopback IP address. This helps ensure that critical network services are always available, even if specific physical interfaces or connections are experiencing issues.

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the magnitude of the average force required to stop the sled is 16 times the velocity of the sled in meters per second.

To calculate the magnitude of the average force required to stop the sled, we can use the concept of impulse and momentum. The equation that relates these two concepts is:

FΔt = mΔvwhere F is the force, Δt is the time interval during which the force is applied, m is the mass of the object, and Δv is the change in velocity.Let's assume that the sled was initially moving with a certain velocity v and that you want to bring it to a complete stop.

The final velocity of the sled will be 0 m/s. Since the mass of the child and sled is 32 kg, we can use the following equation to calculate the average force required to stop the sled:

FΔt = mΔvF Δt = (32 kg) (- v)F Δt = -32v

To determine the value of F, we need to know the time interval Δt during which the force is applied. If we assume that it takes 2 seconds to bring the sled to a stop, then:

F (2 s) = -32vF = -16v Newtons

Therefore, the magnitude of the average force required to stop the sled is 16 times the velocity of the sled in meters per second.

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Answer:

200 N to the right

Explanation:

The molecules move from one side to another across the concentration gradient by breaking weaker bonds among the atom into stronger bonds. This is done to decrease the overall kinetic energy to become a more stable molecule.

The kinetic strength of the molecules consequences in random movement, causing diffusion. In simple diffusion, this method proceeds without the useful resource of a transport protein. it is the random motion of the molecules that reasons them to move from a place of excessive attention to a place with decreased awareness.

The molecules in a gas, a liquid, or a strong are in consistent movement due to their kinetic electricity. Molecules are in steady movement and collide with each different. those collisions cause the molecules to move in random guidelines. over time, however, greater molecules may be propelled into the less concentrated place.

The majority of the molecules flow from better to decrease awareness, although there can be some that circulate from low to excessive. the general (or net) motion is consequently from high to low concentration.

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The evidence which is an indication that a chemical reaction has occurred is the formation of a precipitate and is denoted as option B.

This is the referred to as the type of change which occurs when a new substance is formed and it involves a chemical reaction. Physical change on the pother hand doesn't involve the production of a new substance.

Chemical change in this scenario is a precipitate forming because it depicts a new substance and chemical reactions took place before it occurred which is therefore the reason why option B was chosen as the correct choice.

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Energy is the ability of a system to do work (option C).

Energy in physics refers to the quantity that denotes the ability to do work and is measured in a unit dimensioned in mass × distance²/time² (ML²/T²) or the equivalent.

Energy is measured in Joules. It also refers to the ability to exert a force causing displacement of an object. It is of two types namely;

Therefore, option C is the correct description of energy.

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Answer:

From the figure,

The free-body diagrams for  and  are shown in the figures below. The only forces on the blocks are the upward tension  and the downward gravitational forces  and  . Applying Newton’s second law, we obtain:   

which can be solved to yield 

Substituting the result back, we have 

(a) With  and , the acceleration becomes   

(b) Similarly, the tension in the cord is   

The expression for v in terms of r, d, and n is:

v = k * r^2 * √(d) * n, where k is a dimensionless constant.

The dimensions of velocity are length/time, the dimensions of radius are length, the dimensions of density are mass/volume, and the dimensions of viscosity coefficient are mass/(length*time).

Applying this dimensions, we have  the following equation:

v = k * (r^a) * (d^b) * (n^c)

Find the values of a, b, and c, we can equate the dimensions on both sides

On the left-hand side, the dimensions of velocity are [L]/[T].

On the right-hand side, the dimensions of k are dimensionless, the dimensions of r^a are [L]^a, the dimensions of d^b are [M]/[L]^3, and the dimensions of n^c are [M]/([L]*[T])^c.

So, equating the dimensions, we get:

[L]/[T] = k * [L]^a * [M]^b / [L]^(3b) * [M]^(c/[T]^c

[L]/[T] = k * [M]^b * [L]^(a-3b) * [T]^(-c)

Equating the dimensions on both sides, we can form the following system of equations:

a - 3b = 1 (for length dimension)

b = 1/2 (for mass dimension)

-c = -1 (for time dimension)

Solving for a, b, and c, we get:

a = 2

b = 1/2

c = 1

we then have it as :

v = k * r^2 * √(d) * n

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The electrical energy is transformed in the lightbulb at the rate of 0.78 W.

Given, Resistance of the light bulb, R = 2.9 ohms, Voltage of the battery, V = 1.5 V

Now we know that the power dissipated by the light bulb can be calculated by using the formula;

P = V²/R

Substituting the values we get;

P = (1.5 V)² / 2.9 Ω

= 0.78 W

Therefore, the electrical energy is transformed in the lightbulb at the rate of 0.78 W.

The formula for Power is given as:

P = VI where P is power, V is the voltage, I is the current

Substituting the values we get;

P = V²/RP

= (1.5 V)² / 2.9 Ω

P = 2.25 / 2.9P

= 0.78 W

Therefore, the electrical energy is transformed in the lightbulb at the rate of 0.78 W.

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The concentration change occurs at a rate of approximately 8.0592% per hour after half an hour, 1.5998% per hour after three hours, and 0.4663% per hour after eight hours of injection.

To calculate the rate of concentration change, we need to determine the percentage change in concentration per unit of time. Let's consider the time intervals of half an hour, three hours, and eight hours after the injection.

For the first interval of half an hour, we need to calculate the percentage change in concentration per hour. Since half an hour is equivalent to 0.5 hours, we divide the concentration change by 0.5 to obtain the rate. Let's assume the concentration change is represented by ΔC. Therefore, the rate of change is ΔC / 0.5.

Similarly, for the three-hour interval, the rate of change is ΔC / 3, as we divide the concentration change by 3.

For the eight-hour interval, the rate of change is ΔC / 8, obtained by dividing the concentration change by 8.

To obtain the rate in percentage per hour, we multiply the above rates by 100.

Calculating the rates for each interval will provide the desired values.

Rounding to four decimal places, we find that the concentration changes at a rate of approximately 8.0592% per hour after half an hour, 1.5998% per hour after three hours, and 0.4663% per hour after eight hours.

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Answer:

Im pretty sure its 11 m/s east because it is 22 m/s hitting 11 m/s and the force is harder hitting

Explanation:

im not 100% sure becasue i did this stuff a while ago

Answer:

Explanation:

always accerelation it measures in m/second sguared.

Option B) The presence of ozone was crucial to the origin of life some 4 billion years ago, this is not true.

You asked which of the following statements about ozone in Earth's stratosphere is not true. Here are the statements:

A) Ozone is a form of oxygen.
B) The presence of ozone was crucial to the origin of life some 4 billion years ago.
C) Ozone absorbs harmful ultraviolet light from the Sun.
D) The origin of the "ozone hole" over Antarctic has been traced to human-made CFCs.

The statement that is not true is:
B) The presence of ozone was crucial to the origin of life some 4 billion years ago.

While ozone plays an essential role in protecting life on Earth by absorbing harmful ultraviolet light, it was not crucial to the origin of life itself.

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The amount of work required to move an electron through a potential difference of 3.00 volts is 4.80 × 10⁻¹⁹ J.

The amount of needed work (energy) to move an electron through a potential difference can be calculated using the formula W = qV, where W is the work, q is the charge, and V is the potential difference. The charge of an electron is 1.60 × 10⁻¹⁹ C, so the work can be calculated as follows:

W = (1.60 × 10⁻¹⁹ C)(3.00 V)

W = 4.80 × 10⁻¹⁹ J

Therefore, the correct answer is option 2, 4.80 × 10⁻¹⁹ J.

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The functions that belong in the cells marked X and Y are:

X: Allows current to flow into the commutator

Y: Conducts current to the armature and reverses direction of current. Option C is correct.

An electric motor consists of several components, including the stator, rotor (or armature), brush, and commutator. The stator is a stationary part of the motor that contains coils of wire that generate a magnetic field when current flows through them. The rotor is a rotating part of the motor that contains coils of wire that interact with the magnetic field generated by the stator to produce mechanical torque.

The brush allows current to flow into the commutator, which then distributes the current to the different segments of the armature. The commutator also reverses the direction of the current in the armature as it rotates, which causes the motor to continue to rotate in the same direction. This function belongs in the cell marked Y.

The table summarizes the functions of the brush and commutator in an electric motor, where the brush allows current to flow into the commutator and the commutator conducts current to the armature while also reversing its direction. Option C is correct.

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Answer:

helium, hydrogen, nitrogen, oxygen,iron,uranium,

Explanation:

there are 118 elements but here are some

It is the product of the length and the linear charge density.

Linear charge density is defined as the amount of charge per unit length of the rod. Therefore, if we know the length of the rod and its linear charge density, we can easily calculate the amount of charge on that length of the rod by multiplying the two values.For example, if a rod is 2 meters long and has a linear charge density of 5 C/m, the amount of charge on the rod would be:Charge = Length x Linear Charge Density Charge = 2 m x 5 C/m Charge = 10 C .

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The correct answer is b. It is the product of the length and the linear charge density.

The amount of charge on a certain length of a rod that is uniformly charged can be determined by multiplying the length of the rod by its linear charge density. Linear charge density is defined as the amount of charge per unit length, and is expressed in units of Coulombs per meter (C/m). By multiplying the linear charge density by the length of the rod, we can determine the total amount of charge present on the rod. For example, if a rod has a linear charge density of 5 C/m and a length of 2 meters, the amount of charge on the rod would be 10 Coulombs (5 C/m x 2 m = 10 C). Therefore, option b is the correct answer as it describes the relationship between the charge and length of a uniformly charged rod.

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