A cotton garment cannot keep us warm in winter as a woolen sweater can. Give
reason.

A balloon clings to a wall after it is negatively charged by rubbing because the wall is positively charged.

Yes, opposite charges attract each other. When a positive charge and a negative charge interact with each other, their forces act from the direction of positive to the direction of negative charge. As a result opposite charges attract each other while on the other hand, similar charges repel each other because their forces move in the opposite direction so they repel each other.

So we can conclude that a balloon clings to a wall after it is negatively charged by rubbing because the wall is positively charged.

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The scientific equipment which is appropriate for determining the elements present in distant objects in the universe is optical telescope.

A telescope that gathers and concentrates light mostly from the visible region of the electromagnetic spectrum to produce a magnified image for hands-on examination is called an optical telescope.

Optical telescopes have three characteristics added by astronomers: light-gathering power, resolving power, magnifying power.

Reflecting and refracting telescopes are the two main categories of optical telescopes.

Radio waves from far-off objects are gathered and focused by radio telescopes. Space telescopes in orbit around the Earth gather light at wavelengths that are often obstructed by the atmosphere.

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Due to the identical charge on both pieces of tape  repel , they will repel one another.

A coating of an adhesive comprised of big molecules known as polymers is applied to pressure-sensitive adhesive tapes. These substantial polymers expand out when the tape is pressed against a surface. The interaction and bonding between the surface and the spread-out glue now makes the tape adhere.

The longest-lasting magnetic medium in the IT sector is tape, which has a variety of advantages over rotating drum and flash technology. Cost and capacity are two of these. Once set up, a tape network is inexpensive to run and simple to expand. Tape is now almost as simple to use as NAS since it integrates directly with file systems

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Answer:

69 meters

Explanation:

The average angular acceleration of the skater is approximately 4.19 rad/s².

What is the average angular acceleration of a figure skater?

The initial angular speed of the skater is ω₁ = 4.0π rad/s, and the final angular speed is ω₂ = 8.0π rad/s. The time interval is Δt = 3.0 s.

The average angular acceleration α is defined as the change in angular speed divided by the time interval:

α = (ω₂ - ω₁) / Δt

Substituting the values given, we get:

α = (8.0π - 4.0π) / 3.0 = 4.0π / 3.0 ≈ 4.19 rad/s²

Therefore, the average angular acceleration of the skater during this time interval is 4.19 rad/s².

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Answer:

Explanation:

The Earth pulls the bicycle downward through the force of gravity, and, in response, the bicycle pulls up on the Earth with a force of equal magnitude. Gravity "pushes" the Earth into the road, which pushes up with an opposite force, canceling gravity. Thus, action reaction forces do not cancel each other.

Answer:Boiling

Explanation: If a liquid is heated the particles are given more energy and move faster and faster expanding the liquid. The most energetic particles at the surface escape from the surface of the liquid as a vapour as it gets warmer.

The mechanism that is responsible for the formation of snowflakes is the nucleation of ice crystals.

This is defined as a piece of snow which falls from the sky as a result of an extremely cold climate condition and is common in the arctic regions of the world.

Snow flakes are formed when ice crystals stick together to form the flakes which usually has a dust or pollen being formed around the area being talked about.

This is also regarded as a type of precipitation such as rain etc and is therefore the most appropriate choice.

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To determine the position u of the mass at any time t, we can use the equation of motion for a mass-spring system without damping:n m * u''(t) + k * u(t) = 0

m = 2 lb / (32.2 ft/s^2) = 0.062 lb·s^2/ft

The spring constant k can be determined using Hooke's law:

k = F / x

where F is the force exerted by the mass and x is the displacement. In this case, the force F is the weight of the mass, and the displacement x is 6 in:

k = (2 lb) / (6 in) = (2 lb) / (6 in) * (1 ft/12 in) = 0.111 lb/ft

The equation of motion now becomes:

0.062 * u''(t) + 0.111 * u(t) = 0

To solve this second-order linear homogeneous differential equation, we assume a solution of the form u(t) = A * cos(ωt + φ).

Substituting this assumed solution into the equation of motion, we get:

-0.062 * A * ω^2 * cos(ωt + φ) + 0.111 * A * cos(ωt + φ) = 0

-0.062 * ω^2 + 0.111 = 0

Solving for ω, we get:

ω = sqrt(0.111 / 0.062) = 2.258 rad/s

From ω, we can determine the frequency f and period T:

f = ω / (2π) = 2.258 / (2π) ≈ 0.359 Hz

T = 1 / f ≈ 2.786 s

The amplitude A is determined by the initial conditions. When the mass is pulled down an additional 3 in (0.25 ft) and released, it reaches its maximum displacement, so A = 0.25 ft.

Therefore, the position u of the mass at any time t is given by:

u(t) = 0.25 * cos(2.258t)

To draw the graph of u(t), plot the position u on the y-axis and time t on the x-axis, using the equation u(t) = 0.25 * cos(2.258t). The graph will be a cosine wave with an amplitude of 0.25 ft.

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Answer:

A resistor of 160 ohms should be used to replace the current resistor

Explanation:

Applying,

Ohm's Law

V = IR................... Equation 1

Where V = Voltage of the battery, I = current, R = Resistance

From the question,

Given: I = 0.2 A, R = 120 ohms.

Substitute these values into equation 1

V = 0.2×120

V = 24 V

IF a current of 0.15 A is required,

make R the subject of equation 1

R = V/I............... Equation 2

Given: V = 24 V, I = 0.15 A

Substitute these values into equation 2

R = 24/0.15

R = 160 ohms.

Hence a resistor of 160 ohms should be used to replace the current resistor

A 5.0-uF and a 12.0-uF capacitor are connected in series, and the series arrangement is connected in parallel to a 29.0-MF capacitor. a single capacitor with a capacitance of approximately 33 µF would be required to replace the combination of the three capacitors.

To find the equivalent capacitance of the combination of capacitors in the given circuit, we need to apply the rules for combining capacitors in series and parallel.

Starting with the capacitors in series, we know that the inverse of the equivalent capacitance of capacitors in series is equal to the sum of the inverses of their individual capacitances:

1/Ceq = 1/C1 + 1/C2

Substituting the given values, we have:

1/Ceq = 1/5.0 µF + 1/12.0 µF

Simplifying the equation gives:

1/Ceq = (12 + 5) / (5 × 12) = 17 / 60

Taking the reciprocal of both sides, we find:

Ceq = 60 / 17 µF ≈ 3.529 µF

Now, the equivalent capacitance of the series combination is connected in parallel to the 29.0 µF capacitor. The total capacitance in parallel is the sum of the individual capacitances:

Ctotal = Ceq + 29.0 µF = 3.529 µF + 29.0 µF = 32.529 µF ≈ 33 µF

Therefore, a single capacitor with a capacitance of approximately 33 µF would be required to replace the combination of the three capacitors.

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Hyperhydration in athletes is a strategic approach used to optimize hydration levels. While it can be a pre-competition strategy, excessive fluid intake can lead to dangerous conditions like hyponatremia. Caution is advised.

Hyperhydration in athletes is a strategic approach used to enhance performance and optimize hydration levels before exercise or competition. It involves increasing fluid intake beyond normal levels to achieve a state of enhanced hydration.

Hyperhydration as a pre-competition strategy involves consuming additional fluids to achieve a fluid surplus in the body, increasing total body water. This can be done through careful planning and timed fluid intake, typically in the hours leading up to an event. The goal is to ensure the body is well-hydrated and prepared for the physical demands of the activity. Hyperhydration strategies may include the consumption of sports drinks, water, and electrolyte-rich fluids.

However, it is important to note that hyperhydration can become a dangerous medical condition if taken to extreme levels. Excessive fluid intake without proper monitoring and guidance can lead to a condition known as hyponatremia, where the blood sodium levels become dangerously diluted. Hyponatremia can cause symptoms ranging from mild discomfort to severe health complications, including organ dysfunction and even death. Therefore, athletes should approach hyperhydration with caution and under the guidance of healthcare professionals or sports nutritionists to prevent the risks associated with overhydration.

In summary, hyperhydration can be a normal condition in athletes, serving as a pre-competition strategy to optimize hydration levels and enhance performance. However, it is essential to understand the potential risks involved and avoid excessive fluid intake to prevent the development of dangerous medical conditions such as hyponatremia.

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The [H3O+] concentration of a 0.130 M solution of H3C6H5O7 can be calculated using the acid dissociation constants (Ka) of each ionization step and the equilibrium concentrations of each species.

H3C6H5O7 is a polyprotic acid, which means it can donate more than one hydrogen ion (proton) in solution. Each ionization step has its own acid dissociation constant, which determines the extent to which the acid dissociates in solution and the relative concentrations of the acid and its conjugate base.

To calculate [H3O+] of the solution, the acid dissociation constants and equilibrium concentrations of each species must be taken into account. The first ionization step can be written as follows:

H3C6H5O7 ⇌ H+ + HC6H5O7-

The equilibrium constant for this reaction is Ka1 = [H+][HC6H5O7-]/[H3C6H5O7]. Using the initial concentration of H3C6H5O7, the equilibrium concentration of H+ and HC6H5O7- can be calculated.

The same process can be repeated for the second and third ionization steps using their respective acid dissociation constants, Ka2 and Ka3.

Once the equilibrium concentrations of all species are known, the [H3O+] can be calculated using the equation [H3O+] = Kw/[OH-], where Kw is the ion product constant of water (1.0 x 10^-14 at 25°C).

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It is assumed that every adult has a home phone number is the potential source of bias

Systematic variations in how individuals are dropped from the study and how the results are adjusted for them (e.g., incomplete follow-up, differential attrition). bias brought on by an inadequate evaluation of the results. During the course of the study, selection bias can arise from missing data bias.

It is not possible to totally avoid confounding effects. Therefore, every scientist should be aware of all potential causes of bias and take all reasonable steps to minimize and lessen the departure from the truth. Authors should acknowledge any remaining variation in their writing by outlining any recognized constraints on their effort.

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The complete question is: An opinion poll calls 2000 randomly chosen residential telephone numbers then asked to speak with an adult member of the household the interviewer asks box office revenues are at an all-time high how many movies have you watched any theater in the past 12 months and all 1131 people responded the researchers use the responses to estimate the main number of movies adults have watched any movie theater in the past 12 months. What is the potential source of bias in this question

Answer:

Follows are the soplution to this question:

Explanation:

In the given scenario it would be like a fluid in a simple harmonic in contact with the earth. Whenever a cheetah hops quicker, oscillatory amplitude rises, while the duration stays the same since it does not depend on frequency, which mostly means that time will be the same if you're in contact with the substrate.

Answer:

13,482m deep

Explanation:

1,498×9 =13,482m deep

Answer:

e search mo sa utak mo kasi di mo alam

Answer: A negative value is values and frequency for the data you are analyzing had enough negative values. Sometimes distance can be negative. For example, when you are in the pool, underwater, or standing left from the middle of origin.

Explanation:

Answer:

chemical i think

I hope this helped

In a standing wave on a string fixed at both ends, where there is a node in the middle as well as at either end, the frequency of this wave will be double the frequency of the fundamental mode.

The fundamental mode of a standing wave on a string fixed at both ends has a single antinode in the middle and nodes at either end. This is the lowest frequency mode, also known as the first harmonic or the fundamental frequency.

When a node is introduced in the middle, as well as at either end, it creates two additional nodes in addition to the original two nodes at the ends. This creates two additional antinodes. The resulting standing wave pattern is the second harmonic.

The frequency of the second harmonic is twice that of the fundamental frequency because it completes two full oscillations (cycles) in the same time it takes for the fundamental mode to complete one cycle.

Therefore, the frequency of this standing wave with nodes in the middle and at either end will be double the frequency of the fundamental mode.

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Jupiter's volume is more than ten times as large as Saturn's volume. This statement is true. Jupiter is the largest planet in our solar system with a volume of about 1,431,281,810,739 km³ while Saturn is the second-largest planet with a volume of about 827,129,915,150 km³.

Jupiter is approximately 11 times larger than Saturn. The two planets belong to the gas giant category, and they share many similarities such as having a large number of moons. Jupiter is famous for its Great Red Spot and powerful magnetic field, while Saturn is well-known for its stunning ring system. Both planets have been the focus of scientific research and exploration, and they continue to fascinate scientists and stargazers alike. In conclusion, Jupiter's volume is more than ten times as large as Saturn's volume.

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Crest is the part of the wave which does this.

A sound wave is the sample of disturbance resulting from the movement of strength visiting through a medium, including air, water or every other liquid or stable remember as it propagates far from the supply of the sound.

The sound waves are generated by a sound source, such as the vibrating diaphragm of a stereo speaker. The sound source creates vibrations in the surrounding medium. because the supply continues to vibrate the medium, the vibrations propagate far from the supply at the rate of sound, hence forming the sound wave.

A sound wave is not a transverse wave with crests and troughs, however alternatively a longitudinal wave with compressions and rarefactions.

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The given statement "if a westward moving object experiences an impulse towards the east, it must now be moving eastward" is true because according to Newton's third law of motion, if an object experiences an impulse in a certain direction, it will result in a change in momentum and the object will move in the opposite direction.

In this case, if a westward moving object experiences an impulse towards the east, the impulse will cause a change in the object's momentum, resulting in the object moving eastward. This is because the impulse imparts an acceleration to the object in the opposite direction to the initial motion.

The object will continue to move in the direction of the impulse until acted upon by another force. Therefore, it can be concluded that if an object initially moving westward experiences an impulse towards the east, it must now be moving eastward.

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The speed of the spaceship as measured by the earth observer is 0.4c.

To determine the speed of the spaceship, we can use the time dilation formula:
Δt' = Δt/√(1-v²/c²)
where Δt is the time interval measured by the earth observer, Δt' is the time interval measured by an observer on the spaceship, v is the velocity of the spaceship, and c is the speed of light.
In this case, Δt' = 0.75 μs and the proper length of the spaceship, L, is 300 m.
Using the equation for proper length contraction, we can find L' = L/√(1-v²/c²)
Solving for v in both equations and equating them, we get:
v = (L/L') * c * √(1-((Δt/Δt')²))
Plugging in the values, we get v = 0.4c, where c is the speed of light. Therefore, the speed of the spaceship as measured by the earth observer is 0.4 times the speed of light.

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Answer:

F = 9 N

Explanation:

We have,

Mass of a ball is 2 kg

The radius of the circle the ball travels around is 2 m

Let the velocity of the ball is 3 m/s

It is required to find the centripetal force on the ball. The force that is required to move an object in circular path is called centripetal force.

\(F=\dfrac{mv^2}{r}\\\\F=\dfrac{2\times (3)^2}{2}\\\\F=9\ N\)

So, the centripetal force on the ball is 9 N.

Answer:

Explanation:

57.8 m/s

Answer:

The new force becomes 3 times of the initial force.

Explanation:

Let q₁ and q₂ are two charged particles. The force between them is given by :

\(F=\dfrac{kq_1q_2}{r^2}\ ......(1)\)

If \(q_1'=\dfrac{q_1}{4}\)

and

\(q_2'=3q_2\)

Also, r' = r/2

New force,

\(F'=\dfrac{kq_1'q_2'}{r'^2}\)

Putting all the above values,

\(F'=\dfrac{k\dfrac{q_1}{4}3q_2}{(r/2)^2}\\\\F'=3\times \dfrac{kq_1q_2}{r^2}\\\\F'=3F\)

So, the new force becomes 3 times of the initial force.

In 6 hours the total decrease in temperature is 15 degrees Celcius and it reaches -18 degrees Celcius.

Option A is the correct answer.

Given that the temperature at noon is -3 degrees Celsius.

The temperature is expected to decrease by 2.5 degrees Celsius each hour until the temperature reaches -18 degrees Celsius.

Current temperature = \(-3^\circ \;\rm C\).

Required Temperature = \(-18^\circ \;\rm C\)

Difference between the current and required temperature = \(18 - 3 = 15^\circ \; \rm C\)

Decrease in Temperature = \(2.5^\circ \;\rm C/hr\)

In 6 hours, the decrease in temp.  = \(2.5 \times 6\) = \(15^\circ \;\rm C\)

It means that in 6 hours the total decrease in temperature is 15 degrees Celcius and it reaches -18 degrees Celcius.

Hence option A is the correct answer.

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