An ice skater goes into a spin while she is keeping her arms extended at her sides. When she pulls her arms and legs in:

(c) Both did the same amount of work. The work done is determined by the force exerted on the stairs multiplied by the distance traveled.

(c) Both did the same amount of work. The work done is determined by the force exerted on the stairs multiplied by the distance traveled. In this scenario, the force exerted by each person is their weight, which is directly proportional to their mass. Since both people have the same mass, their weight and force exerted on the stairs are equal. Additionally, since they climbed the same flight of stairs, the distance traveled is also the same for both individuals. Therefore, the work done by each person is equal. The time taken to complete the task does not affect the amount of work done, as work is independent of the duration of the activity.

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The angular momentum of the particle about the origin is 1.5 kg.m^2/s.

To find the angular momentum, we need to use the formula L = r x p, where r is the position vector and p is the momentum vector. Since the particle is moving in the xy-plane, we can assume that its position vector is in the form (x, 2.5, 0), where x is the distance from the y-axis. We can also assume that the momentum vector is in the form (p, 0, 0), where p is the magnitude of the momentum. Using the given velocity, we can find the magnitude of the momentum to be 0.4*6 = 2.4 kg.m/s. Taking the cross product of the position and momentum vectors, we get L = (2.5)(2.4)i = 1.5 kg.m^2/s. Therefore, the angular momentum of the particle about the origin is 1.5 kg.m^2/s.

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Answer:  TRUE /   IT IS TRUE

Explanation:

A drill bit is a cutting tool used to create a circular hole. The drill bits used in air rotary drilling rigs are hollow steel.Petroleum drill bits can be 36 centimeters , [14 inches] in diameter. As the drill bit rotates and cuts through the earth, small pieces of rock are chipped off. Drill bits are used to make a circular hole.

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Answer:

the solid steel ball...more mass more weight more gravity

Explanation:

Answer:

Solid steel ball. It has more mass therefore more force will be acting on it.

Explanation:

A blood alcohol concentration (BAC) of .08 indicates that there is 0.08% of alcohol in a person's bloodstream by volume.

In most countries, including the US, this is the legal limit for driving under the influence (DUI). This means that if a person's BAC is equal to or above .08, they are considered legally impaired and could face legal consequences for operating a motor vehicle.

Alcohol affects different individuals in different ways, and BAC can be influenced by various factors, such as weight, gender, the rate of alcohol consumption, and the amount of food consumed before drinking. Therefore, it is always recommended to avoid drinking and driving to ensure personal safety and the safety of others on the road.

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Answer:

\( Energy, \; E = 2.6504 * 10^{-34} \; Joules \)

Explanation:

Given the following data;

Frequency = 4.0 x 10⁹ Hz

Planck's constant, h = 6.626 x 10-34 J·s.

To find the energy of the electromagnetic wave;

Mathematically, the energy of an electromagnetic wave is given by the formula;

E = hf

Where;

E is the energy possessed by a wave.

h represents Planck's constant.

f is the frequency of a wave.

Substituting the values into the formula, we have;

\( Energy, \; E = 4.0 x 10^{9} * 6.626 x 10^{-34} \)

\( Energy, \; E = 2.6504 * 10^{-34} \; Joules \)

I think it's more waves

False. While there are known long-term effects of radiation exposure, the specific effects on an individual can vary depending on factors such as the type and amount of radiation exposure, age, health status, and genetics.

Some known long-term effects of radiation exposure include an increased risk of cancer, genetic mutations, and damage to organs such as the thyroid and reproductive organs. However, the severity and timing of these effects can vary widely among individuals. Additionally, exposure to radiation can also have immediate effects such as skin burns and radiation sickness. It is important to note that the long-term effects of radiation exposure can be reduced through measures such as limiting exposure time, using protective equipment, and following proper safety protocols.
b. False

Long-term effects of radiation on an individual are not entirely predictable. While it is true that exposure to high levels of radiation can lead to an increased risk of certain health issues such as cancer and genetic mutations, the specific outcome for an individual depends on various factors. These factors include the type and amount of radiation, duration of exposure, age, and individual genetic makeup. Additionally, the latent period between radiation exposure and the onset of health issues can vary significantly, making it challenging to predict the exact long-term effects for a particular individual.

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A device that is capable of moving atoms and molecules with a laser beam is called an optical tweezer. The correct option is B)

This technology was first introduced by Arthur Ashkin in 1986 and has since revolutionized the field of physics and biology. Optical tweezers use the force of light to trap and manipulate small particles, such as individual atoms and molecules. The laser beam creates a gradient of light intensity, which generates a force that can move and hold particles in place.

This technique has a wide range of applications, including the study of cell mechanics, protein folding, and the assembly of nanostructures. Optical tweezers have also been used in the development of micro-machines, sensors, and other advanced technologies. This device is not to be confused with an atom smasher, which is used to accelerate subatomic particles to high speeds, or a laser scalpel, which is used for precise surgical procedures.

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Answer:

Conductor

Explanation:

A battery holds all of the energy in itself. So without the battery, the circuit cannot work.

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To determine the largest internal flaw size that an aluminum alloy can support when used as a structural plate component, we must consider the material's strength and fracture toughness. The fracture toughness is a measure of a material's resistance to crack propagation, and it is characterized by the critical stress intensity factor, KIC.

The equation that relates the critical stress intensity factor to the flaw size is:
KIC = Yσ√a
where Y is the shape factor, σ is the yield strength, and a is the flaw size.

Since the shape factor is assumed to be 1, we can simplify the equation to:
KIC = σ√a
We can rearrange this equation to solve for the largest flaw size:

a = (KIC/σ)^2
Substituting the values given in the problem, we get:
a = (25.6 mpa√m / 455 mpa)^2

a = 0.0004 m^2
Therefore, the largest flaw size that the aluminum alloy can support is 0.0004 square meters.

In summary, the strength and fracture toughness of the aluminum alloy must be considered when designing a structural plate component that must support a certain amount of tension. The critical stress intensity factor and flaw size can be used to determine the maximum load that the material can handle without failure. In this case, the largest flaw size that the aluminum alloy can support is 0.0004 square meters, given its yield strength and fracture toughness.

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Answer:

standing wave, also called stationary wave, combination of two waves moving in opposite directions, each having the same amplitude and frequency.

For oppositely moving waves, interference produces an oscillating wave fixed in space. fixed nodes in a standing wave. Location of fixed nodes in a standing wave

these are the points that undergo the maximum displacement during each vibrational cycle of the standing wave. In a sense, these points are the opposite of nodes, and so they are called antinodes. A standing wave pattern always consists of an alternating pattern of nodes and antinodes

Explanation:

Answer:

20100s

Explanation:

Answer:

THE ANSWE IS C

81

Explanation:

A blackbody spectrum of temperature 900 Kelvin has been simulated. The peak wavelength in nanometers of an object of that temperature is determined to be nanometers. The intensity of the blackbody radiation at a given temperature and wavelength can be determined using Planck's law.

Planck's law, which describes the intensity of blackbody radiation, is given byI(λ) = 2hc²λ⁻⁵[exp(hc/λkT) - 1]⁻¹Where c = speed of light, h = Planck's constant, k = Boltzmann constant, T = temperatureλ = wavelength of lightI (λ) = spectral radiant intensity expressed in watts per square metre per unit wavelength.

Simulating the blackbody spectrum for a temperature of 900 K:

Using the equation for peak wavelength λ_max = 2897/T nm, where T = 900 KTherefore,λ_max = 2897/900λ_max = 3.22 µm or 3220 nm.

The emissive intensity of the object (the amount of power emitted per unit area) is given asI = σT⁴, where σ is the Stefan-Boltzmann constant.

Therefore,I = σT⁴ = 5.67 × 10⁻⁸ × (900)⁴W/m²= ×10 W/m².

Hence, the emissive intensity of the object is ×10 W/m².

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The correct answer is B to C.

From the law of conservation of energy, energy can neither be created nor be destroyed but can be converted from one form to another.

Potential energy is the form of energy that is possessed by an object due to its height. The kinetic energy is the form of energy that is possessed by an object due to its motion.

The gravitational potential energy of the roller coaster will be maximum when it is at the maximum height and it will decrease with the decreasing height.

Its kinetic energy will be maximum when it has a maximum velocity.

Thus the roller coaster will have maximum kinetic energy at point B. And as it rises on the track towards point C, it will lose its kinetic energy which will be transformed into potential energy.

Thus as the roller coaster moves from B to C, its kinetic energy will be transformed

Answer:

i) Power = Force * Velocity = 1100 * 15 = 16500 W = 16.5 kW(ii)  Find the value of k first: F = 400 + k(15^2)                                              k = 28/9    F = 400 +(28/9)(30^2) = 320

Explanation:

Answer:

51.96 inches

Explanation:

Multiply 1.32 by 39.37

Answer:

52.0 inches

Explanation:

1.32 meters * 39.37  = 51.96 inches ~ 52.0 inches

stick is like a rod

So

\(\\ \rm\Rrightarrow I=\dfrac{ML^2}{12}\)

\(\\ \rm\Rrightarrow I=\dfrac{2(3)²}{12}\)

\(\\ \rm\Rrightarrow I=\dfrac{9}{6}\)

\(\\ \rm\Rrightarrow I=\dfrac{3}{2}\)

\(\\ \rm\Rrightarrow I=1.5kgm^2\)

\(\Large \boxed{\displaystyle density \ (kgm^{-3})=\frac{mass\ (kg)}{volume \ (m^3)} }\)

The kinetic energy of an object is equal to 1/2mv^2, where m is the mass of the object and v is the velocity of the object.

The spring potential energy of an object is equal to 1/2kx^2, where k is the spring constant and x is the displacement of the object from the equilibrium position. The gravitational potential energy of an object is equal to mgh, where m is the mass of the object, g is the acceleration due to gravity, and h is the height of the object.

There are three types of energy that are important in physics: kinetic energy, spring potential energy, and gravitational potential energy. Kinetic energy is the energy of motion, spring potential energy is the energy stored in a spring, and gravitational potential energy is the energy associated with gravity.

Kinetic energy is important because it is the energy that objects have when they are in motion. The kinetic energy of an object is equal to 1/2mv^2, where m is the mass of the object and v is the velocity of the object. This means that the kinetic energy of an object increases as the mass of the object increases or as the velocity of the object increases.

Spring potential energy is important because it is the energy that is stored in a spring. The spring potential energy of an object is equal to 1/2kx^2, where k is the spring constant and x is the displacement of the object from the equilibrium position. This means that the spring potential energy of an object increases as the spring constant increases or as the displacement of the object from the equilibrium position increases.

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Option A: Among the elements listed, the one that, when doping a matrix of germanium, does not result in an n-type semiconductor is Bi (Bismuth).

Bismuth is not commonly used as a dopant for creating an n-type semiconductor in germanium. However, it can be used as a dopant for creating a p-type semiconductor. The other elements listed, At (Astatine), Ga (Gallium), Sb (Antimony), and P (Phosphorus), can be used as dopants to create an n-type semiconductor when added to a germanium matrix.

In both N-type and P-type semiconductors, the doping process intentionally introduces impurities into the semiconductor material to modify its electrical properties and allow for the controlled flow of electric current. The combination and interaction of N-type and P-type semiconductors form the basis for various semiconductor devices, such as diodes, transistors, and integrated circuits.

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Correct question:

Among the elements below, mark the one that, when doping a matrix of germanium, does not result in an n-type semiconductor.

A. Bi

B. At

C. Ga

D. Sb

E. P

Answer:

Respect for elders, Honesty, and Reservedness

Explanation:

As a child, due to the nature of my father's job, I grew up in a barrack where people of different ethnic and cultural backgrounds lived. My father is a highly disciplined man who give great values to behavioral values such as respect, honesty and reservedness. His soldier friends who are equally disciplined instill the same values in their wards. They taught us the importance of possessing these great attributes and ensured that there was compliance.

The upbringing I had as a child made me see these three attributes as a lifestyle and they now have an enormous effect in my daily life.

Answer:

Because I was raised using Authoritative parenting I notice some behavioral effects in myself such as brutal honesty, and heavy loyalty.

Explanation:

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The number of significant figures in an experimental measurement is determined by the accuracy of the instrument or method used to make the measurement.

Significant figures are the digits in a measurement that are known with certainty plus one digit that is uncertain. They are used to indicate the precision of a measurement and to communicate the level of uncertainty in the measurement.

For example, in the measurement 1.2345 kg, there are 5 significant figures: 1, 2, 3, 4, and 5. The first four digits are known with certainty, while the last digit (5) is uncertain.

It is important to keep track of the number of significant figures in each measurement and to report the final result with the appropriate number of significant figures. This ensures that the final result accurately reflects the precision and uncertainty of the measurements used in the calculation. Additionally, the number of significant figures can be affected by calculations involving the measurement, such as rounding or multiplication.

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Answer: a b c or d

Explanation