An ice skater pulling her arms in during a spin decreases her moment of inertia, increases her angular velocity, and consequently increases her rotational kinetic energy due to the conservation of angular momentum.
When an ice skater spins with her arms stretched out and then pulls them in, her moment of inertia decreases. Since angular momentum must be conserved in the absence of external torques, her angular velocity increases. According to the formula for rotational kinetic energy, K = (1/2)Iω², where K is the kinetic energy, I is the moment of inertia, and ω is the angular velocity, we can see that the kinetic energy depends on both the moment of inertia and the square of the angular velocity. When the skater pulls in her arms, and her moment of inertia decreases, her angular velocity increases sufficiently such that her rotational kinetic energy actually increases because it is proportionate to the square of the angular velocity. Hence, the work done by the skater to pull her arms in results in an increase in rotational kinetic energy, and the correct answer is that her kinetic energy increases, but the exact factor of increase would depend on the relationship between the new and original angular velocities.
Its C Disposal of radioactive waste is a major concern in nuclear power production. Which method of disposal is least dangerous?
If a rock weighing 2,200 N is dropped from a height of 15 m, what is its KE just before it hits the ground? Remember, weight is measured in newtons (N), and is equal to mass times gravity.
A. 0 J
B. 2,224 J
C. 147 J
D. 33,000 J
A parallel circuit has two 8.0-ohm resistors and a power source of 9.0 volts. If a 12.5-ohm resistor is added to the circuit in parallel, how will the current be affected and what value will it have?
Answer:
1/R1 + 1/R2 + ... = 1/Re
So...
1/17.2 + 1/22.4 = 1/Re
0.1021 = 1/Re
Re = 9.792 Ohms
Now use the Voltage equation V = IR
6 = I * 9.792
I = 6/9.792 = 0.613 Amps.Pato 0.61
Explanation:
As part of an exercise program, a woman walks south at a speed of 2.00 m/s for 60.0 minutes. she then turns around and walks north a distance 3000 m in 25.0 minutes (a) what is the woman's average velocity during her entire motion?
a.0.824 m/s south
b.1.93 m/s south
c.2.00 m/s south
d.1.79 m/s south
e.800 m/s south
The woman's average velocity during her entire motion is approximately 1.79 m/s south.
Explanation:To find the woman's average velocity, we need to calculate the total displacement and divide it by the total time taken. Southward motion is taken as negative, and northward motion is taken as positive. Let's calculate:
Southward motion: displacement = -2.00 m/s × 60.0 min = -120.00 mNorthward motion: displacement = 3000 mTotal displacement = -120.00 m + 3000 m = 2880.00 mTotal time = 60.0 min + 25.0 min = 85.0 minTherefore, the woman's average velocity is:
average velocity = total displacement / total time
average velocity = 2880.00 m / 85.0 min
average velocity ≈ 33.88 m/min
To convert to m/s, we divide by 60:
average velocity ≈ 33.88 m/min ÷ 60 ≈ 0.5647 m/s
Since the woman was walking southward, the average velocity is negative. So the correct answer is Option d. 1.79 m/s south.
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A circuit has a current of 1.2 A. If the voltage decreases to one third of its original amount while the resistance remains constant, what will be the resulting current?
If 1495 j of heat is needed to raise the temperature of a 351 g sample of a metal from 55.0°c to 66.0°c, what is the specific heat capacity of the metal?
sorry i don't know the answer i'm really sorry
A 5.3 kg cat and a 2.5 kg bowl of tuna fish are at opposite ends of the 4.0-m-long seesaw. how far to the left of the pivot must a 3.7 kg cat stand to keep the seesaw balanced?
To keep the seesaw balanced, the 3.7 kg cat must stand 2.06 meters to the left of the pivot.
Explanation:To keep the seesaw balanced, the torques (rotational forces) on both sides of the pivot must be equal. The torque is given by the product of the mass and the distance from the pivot. In this case, the 5.3 kg cat and the 2.5 kg bowl of tuna fish create a torque on one side, while the 3.7 kg cat creates a torque on the other side. Let's denote the distance from the pivot to the 5.3 kg cat as x:
Torque on one side = 5.3 kg * x
Torque on the other side = 2.5 kg * 1.5 m + 3.7 kg * (4 m - x)
Setting these two torques equal to each other and solving for x:
5.3 kg * x = 2.5 kg * 1.5 m + 3.7 kg * (4 m - x)
Simplifying the equation:
5.3x = 3.75 + 14.8 - 3.7x
9x = 18.55
x = 2.06 meters
Therefore, the 3.7 kg cat must stand 2.06 meters to the left of the pivot to keep the seesaw balanced.
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A crate of mass 5 kg slides along a horizontal surface with coefficient of kinetic friction of 0.3. the force is pulled by a rope that makes an angle of 30o above the horizontal. the tension in the rope is 150 n. what is the power supplied by the rope to the crate at an instant where the box is moving at a speed of 3 m/s in the direction the rope is pulling it?
Why are conductors and insulators both required to construct the electrical wiring in our home
How many significant digits are in the measurement 50.003010 nm?
Answer:
Significant digits = 8
Explanation:
Significant digits in a number which is more than 1 and if the number if having decimal in it then as per the rule all the digits present in the number must be significant digit
for an example we will say
1.00 = 3 significant figures
so in this way for all such kind of numbers we have to count all digits in it
so here given number is more than 1 and it contains the decimal in it
so we will say
50.003010 nm = 8 significant figures
Answer:
There are 15 significant digits
Explanation:
50.00301 nm = 0.0000000500301
Counting the figures makes it 15
Jupiter _____.
may have prevented asteroids from forming a planet
has a large gravitational field which can capture small comets
is responsible for creating most known meteors and meteoroids
releases radiation which warms comets and creates a comet tail
Answer:
Jupiter may have prevented asteroids from forming a planet
Explanation:
The potential energy due to the strong interaction, between two quarks or a quarkantiquark pair, goes something like v (r) = −α/r + βr, where α and β are positive constants. is there any point rv where the potential energy goes to zero? is there any point
Allison wants to calculate the speed of a sound wave. Which formula should she use?
distance traveled / amplitude
number of wavelengths / amplitude
number of wavelengths / time
distance traveled / time
Answer:
Option 4th is correct
distance traveled / time
Explanation:
Allison wants to calculate the speed of a sound wave.
The speed of the sound wave is the distance traveled divided by the time.
[tex]v = \dfrac{d}{t}[/tex]
Where, v = speed of sound
d = distance
t= time
Therefore, The formula should she use is, distance traveled / time
A calorie is the measurement of ____ required to raise a 1 gram of water 1 degree celsius.
A wave has a velocity of 24 m/s and a period of 3.0 s. Calculate the wavelength of the wave
Answer:
72 m
Explanation:
The period of a wave is the amount of time it takes a wave complete one full cycle. The period is the inverse of the frequency.
Given;
Wave Velocity V = 24 m/s
Period T = 3.0s
Frequency of the wave F = 1/T= 1/3
Wavelength W= ?
Wavelength is the distance covered by a wave in a complete cycle i.e from one crest to another, or from one trough to another.
W = V/F = VT
W = 24/ (1/3)
W = 24 × 3
W = 72 m
When light propagates from a material with a given index of refraction into a material with a smaller index of refraction, the speed of the light vie?
When light moves from a material with a higher index of refraction to one with a lower value, the speed of light increases, potentially causing the light to refract. The index of refraction ratio determines the extent of this change in speed.
When light travels from a material with a higher index of refraction to one with a lower index of refraction, the speed of light in the material increases. The index of refraction, denoted as n, is defined by the ratio n = c/v, where c is the speed of light in a vacuum (approximately 3.0 * 10⁻⁸ m/s), and v is the observed speed of light in the material.
Since the index of refraction for a vacuum is exactly 1 (because the speed of light in a vacuum is c), and since n is always greater than or equal to 1, when light enters a material with a smaller n, it means that v must increase."
For example, when light moves from water (where it travels slower due to a higher n) into air (with a smaller n), the light speeds up. This change in speed can cause the light to bend or refract. The extent to which this bending occurs depends on the difference in the indices of refraction between the two materials.
The polar ice caps of mars is believed to consist mostly of
The lengthening of a transmitted signal's wavelength and/or a decrease in its frequency, which indicates that the object is moving away from the observer, is called the
The red shift... Hope it helps!
What is the wavelength of a photon whose energy is twice that of a photon with a 622 nm wavelength?
In the past, how did people use the systematic movement of celestial bodies? Select all that apply.
making agricultural decisions
shipping navigation
predicting the future
spiritual and religious practices
tracking storms
In past, people used the systematic movement of celestial bodies for making agricultural decisions, shipping navigation and for spiritual and religious practices.
Answer: Options 1, 2, and 4
Explanation:
The observation of systematic movement of celestial bodies comes under the field of Astrometry. The celestial mechanics which defines are the movement of celestial bodies is also a kind of Astrometry.
The celestial mechanics is used by the people in past to help in navigation during ship journey. Even the astrometry will help in predicting the seasons to be coming which will help in making agricultural decisions.
In astrology, the position of celestial bodies help in deciding the time for spiritual and religious practices. So, in ancient days, people used the systematic movement of celestial bodies in naked eyes to decide these.
How can medical assistant use the knowledge of the nervous systems to care for the patient with Parkinson’s and other neurological disorders
Having a wide knowledge of the nervous system and the of how the brain’s different parts collaborate to organize all our movements, senses thoughts, and emotions enable the medical assistants to handle the cognitive and behavioral complications in the patient. It helps them to deal with wounds and falls since the nervous disorder generally affects cognition and movement. Having a wide knowledge of how the nerve impulses are transmitted from the nervous system to the brain, when it is then converted into feelings such as pleasure, pain, cold or hot, the medical assistant will be able to take response immediately on the patient prior they start complaining of sensory indications, such as discomfort, irritating, and unresponsiveness.
Which of these statements would best explain the problem encountered with nuclear waste disposal?
Answer: A
Explanation:
I need help finding the answer:
When a guitar string plays the note "A", the string vibrates at 440 Hz. What is the period of the vibration?
The period of the guitar string's vibration when it plays the note 'A' is approximately 0.00227 seconds.
Explanation:In physics, the period of vibration refers to the time it takes for a single complete cycle of vibration to occur. It is usually represented by the symbol T and is measured in seconds. To find the period of the guitar string's vibration, you can use the formula T = 1/f, where f is the frequency of the vibration.
In this case, the frequency of the guitar string playing the note 'A' is given as 440 Hz. So, the period can be calculated as T = 1/440 = 0.00227 seconds.
Therefore, the period of the guitar string's vibration when it plays the note 'A' is approximately 0.00227 seconds.
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A relatively long lived excited state of an atom has a lifetime of 2.05 ms. what is the minimum uncertainty (in ev) in its energy?
What waves shown on the electromagnetic spectrum disturb the medium it passes through at answer?
A boat is moving at 3 m/s and increases its speed at 2 m/s2. How fast is it moving after it travels 10 m from the point it begins to speed up?
You have just completed a wonderful meal of pasta and crusty bread followed by a huge piece of chocolate cake. This carbohydrate-rich meal has lead to the release of large amounts of sugar into your bloodstream. What is necessary to address the change in blood sugar level?
Calculate the absolute pressure at the bottom of a freshwater lake at a point whose depth is 27.8 m. assume the density of the water is 1.00 103 kg/m3 and the air above is at a pressure of 101.3 kpa.
The sun's electromagnetic radiation is produced by
The sun produces electromagnetic radiation through the movement of electrically charged particles, resulting in a spectrum of radiation that includes harmful UV rays and visible light. This radiation is fundamental for processes like photosynthesis and solar energy generation.
Explanation:The sun's energy is emitted in the form of electromagnetic radiation, which encompasses a wide array of wavelengths, each with its characteristic energy. This radiation is produced by electrically charged particles undergoing transitions, such as the fusion reactions occurring in the sun's core, which results in the release of energy as photons. These photons travel through space and carry energy, momentum, and when interacting with matter, can exert force.
Among the types of electromagnetic radiation emitted from the sun, we find visible light, ultraviolet (UV) rays, X-rays, microwaves, and radio waves. UV rays have shorter wavelengths than visible light and are more energetic, and they are partially absorbed by ozone molecules in the Earth's atmosphere, which helps to protect living organisms from its potentially harmful effects.
Overall, the sun produces a full spectrum of electromagnetic radiation, measurable by scientists on what is known as the electromagnetic spectrum. The entirety of this spectrum is essential for various processes on Earth, from photosynthesis which supports life to solar panels that harness sunlight for energy.
Which property of light remains unchanged when it enters a different medium?
frequency d is the anwsewr