A constant change of direction implies ongoing alterations in the course of movement, typically involving centripetal acceleration. A merry-go-round and a wind vane demonstrate this, while a kid walking straight does not.
"A constant change of direction" refers to a situation where an object or point is continually altering the course of its movement. In the context of physics and motion, this typically indicates the presence of centripetal acceleration, which is the acceleration directed towards the center of a circular path that keeps an object moving in a curve rather than a straight line.
A merry-go-round spinning in circles displays a constant change of direction due to the rotational movement with each point on the ride continuously changing its direction as it moves in a circle.
A wind vane swinging around also shows a constant change of direction as it repeatedly changes which way it's pointing due to shifting wind directions.
A kid walking on a straight path does not exhibit a constant change of direction because the motion is linear and not curved.
Compare the numbers of protons and electrons in a positive ion with the numbers of protons and electrons in a negative ion.
Answer:
In a positive ion, the number of protons is larger than the number of electrons.
In a negative ion, the number of protons is smaller than the number of electrons.
Explanation:
Each proton carries a positive charge of one unit.
Each elec in tron carries a negative charge of one unit.
In an atom, there are as many protons as electrons. Hence, they are neutral.
However, in a positive ion, there are less negative charge than positive charge. Hence the net charge is positive. That also means that there are fewer negatively-charged electrons than positively-charged protons.
Similarly, in a negative ion, there are more negative charge than positive charge. Hence the net charge is negative. That also means that there are more negatively-charged electrons than positively-charged protons.
a person drops apple from window and it takes about 5s to reach the ground. Determine the height of the wimdow from the ground
Answer:
122.5 m
Explanation:
Given:
Time taken by apple to reach ground (t) = 5 s
Acceleration of the apple is due to gravity (g) = 9.8 m/s²
The displacement of the apple is equal to the height of window (h) = ?
As the apple is dropped, the initial velocity is, [tex]u=0\ m/s[/tex]
Now, using Newton's equation of motion along the vertical direction that relates displacement, initial velocity, acceleration and time taken, we have:
[tex]h=ut+\frac{1}{2}gt^2[/tex]
Plug in the given values and solve for 'h'. This gives,
[tex]h=0+\frac{1}{2}\times 9.8\times 5^2\\\\h=4.9\times 25=122.5\ m[/tex]
Therefore, the height of the window above the ground is 122.5 m.
When you push a child on a swing, you are doing work on the child because _____.
the child is moving in the direction you are pushing
you are allowing the child to continue swinging
you are pushing against the force of gravity
the child is moving at a constant velocity
Answer:the child is moving at a constant velocity
A student pushes on a crate with the force of 100 Newtons directed to the right. What force does the crate exert on the student? Note: It has to be done with the Newton's 2nd Law of Motion.
Answer: The Force exerted on the student by crate will be 100 N.
Explanation: As per the given Question student is trying to push the crate in right direction with the force of 100N.
And we know that, Newton's third law states that every action has equal and opposite reaction.
So from the Newton's 3rd law of motion it is very clear the student must be experiencing the same amount of force which he is applying.
A weightlifter lifted 800 Newtons to a height of 2.5 meters. What is the power output if this was
done in 1.22 seconds?
The power required is 1.6 kW.
Answer:
Explanation:
Power is defined as the amount of work done on any object for a given time interval. In other words, power is the amount of force required to move an object in a given period of time.
Power = Work done / time taken for that work done.
Here the force is given as 800 N and the displacement is given as 2.5 m, while the time required for the displacement is given as 1.22 seconds.
So the power will be ratio of the product of force acting on the weightlifter, displacement of the weight to the time taken for that displacement.
Power = (800×2.5)/1.22 =1639 W
So the power required is 1.6 kW.
Flexibility is a key characteristic for all leadership styles.
Please select the best answer from the choices provided.
T
F
Explanation:
the answer is true....maybe
Flexibility Leaders can able to adapt changes in circumstances and modify the way of approaching. Hence, the option A is correct.
What is Flexible Leadership?Flexibility in leadership is the important quality for the leaders. It helps the leaders to adapt changes in their leadership style and serves the best for their team.
Flexible leaders can modify their style and way of approaching the situations. Those leaders can earn the trust of the people and encourage new ideas to increase productivity.
They can approach the situations in creative manner and incorporate new innovation and overcome the challenges. Flexible leaders enhance the sustainable growth and profit.
Hence, Flexibility is a key characteristic for all leadership styles is True.
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A 2-kg toy car accelerates from 5 to 10 m/s.
A 2-kg toy car accelerates from 5 to 10 m/s in 2 seconds. Find the applied force.
Answer:Force applied is [tex]5\frac {kgm} {s^2}[/tex].
Explanation:Force is defined as something which changes or tends to change the velocity of a body. And acceleration is defined as the rate of change of velocity of a body per time. Both of them are vector quantities.
The initial velocity of the body = 5 m/s.
The final velocity of the body = 10 m/s.
So the change in velocity = 10 - 5 m/s = 5m/s.
Time period = 2 seconds.
So acceleration =[tex]\frac52 m/s^2[/tex]= [tex]2.5 m/s^2[/tex]
The force is defined as the product of mass and acceleration of the body.
Mass of body = 2 kg.
So, force applied = [tex]2 \times 2.5 kgm/s^2[/tex]. =[tex]5kgm/s^2[/tex].
Which of the following describes the time over which a periodic wave repeats?
A. frequency
B. wavelength
C. amplitude
D. period
Answer:
C
Explanation:
i dont know im just guessing im way too young for this stuff
the time over which a periodic wave repeats describes as a time period.
What is a periodic wave?A wave with a recurrent pattern that controls its wavelength and frequency is called a periodic wave. The time it takes for a waveform to complete one cycle is referred to as a period, and the frequency is the number of cycles per second of time. It has amplitude, period, and frequency characteristics.
Frequency:
Frequency is the number of occurrences of a repeating event per unit of time.
Wavelength:
A waveform signal that is carried in space or down a wire has a wavelength, which is the separation between two identical places (adjacent crests) in consecutive cycles.
Amplitude (A):
The maximum displacement of a wave on either side of its mean position is called Amplitude.
Time Period (T):
The time taken to complete one vibration is called the Time period.
therefore, period describes the time over which a periodic wave repeats.
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The “Big Bang” is an example of what type of scientific statement?
Answer:
The big bang is a example of scientific theory
Explanation:
The Big Bang is an example of a scientific theory about the origins and evolution of the universe. It has been substantiated through numerous tests and observations, specifically those related to the cosmic microwave background radiation and the expansion of the universe.
Explanation:The 'Big Bang' is an example of a scientific theory. A scientific theory is an explanation for a range of phenomena that has been substantiated through repeated testing and observation. In this case, the Big Bang theory explains the origins and evolution of the universe. According to this theory, the universe originated from a singularity, a point of infinite density and temperature, about 13.8 billion years ago, and it has been expanding ever since. This theory is based on a wide range of observations, including those related to the cosmic microwave background radiation and the expansion of the universe.
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What is a horizontal segment meaning on a position vs. time graph?
The velocity of the object is zero (the object is at rest)
Explanation:
A position vs time graph represents the motion of an object; in particular:
The position of the object x(t) is represented on the y-axisThe time t is represented on the x-axisFor a position-time graph, the slope of the graph is given by
[tex]m=\frac{\Delta x}{\Delta t}[/tex]
where
[tex]\Delta x[/tex] is the change in position
[tex]\Delta t[/tex] is the change in time
However, we see that this is equivalent to the definition of velocity:
[tex]v=\frac{\Delta x}{\Delta t}[/tex]
Therefore, the slope of a position-time graph is equivalent to the velocity of the object.
And so, a horizontal segment on a position vs time graph means that the object has zero velocity (because the slope is zero).
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What is ohms law for science
Answer:
Explanation:
According to ohm's law
The current flowing through the wire is directly proportional to the potential difference applied across its ends , provided the temperature and other physical conditions of the wire like stresses and strains remains constant .
Calculate the centripetal force on a 4.5 kg sensor that is attached at the end of a 90.0-m long wind turbine blade that is rotating at 1.00 rev/s.
Final answer:
The centripetal force on the sensor is 2544.06 N.
Explanation:
To calculate the centripetal force of on the sensor attached at the end of the wind turbine blade, we can use the formula:
F = m * r * ω²
Where F is the centripetal force, m is the mass of the sensor, r is the radius of the wind turbine blade, and ω is the angular velocity.
Substituting the given values, we have: F = 4.5 kg * 90.0 m * (2π rad/s).
After calculating, we get the centripetal force on the sensor to be 2544.06 N.
Using what you know about the periodic table, choose all of the correct answers,
Answer:
What are the choices?
Liquids usually have higher volume coefficients of expansion than solids do.
true or false
Answer: true
Explanation:
The answer is true! Hope this helps!! :)
a student uses a simple machine to help lift a load.when 40N of input force is applied to the machine it is able to lift 160N .what is the mechanical advantage of the machine
Final answer:
The mechanical advantage of the machine is 4, indicating it multiplies the input force by a factor of four.
Explanation:
The student is asking about the concept of mechanical advantage (MA), which is a measure of the force amplification achieved by using a tool, mechanical device, or machine system. The mechanical advantage is calculated as the ratio of the output force to the input force. In this case, a machine lifts a load with an output force of 160N when an input force of 40N is applied. Thus, the mechanical advantage of the machine is calculated by dividing the output force by the input force.
MA = Output Force / Input Force = 160N / 40N = 4.
So, the mechanical advantage of the machine is 4, which means the machine multiplies the input force by four times.
How to find a total resistance of the circuit
Answer:
To find the total resistance of the circuit:
They are 2 ways to get that ( you can use both methods for 1 exercise)
1- If resistances are series, just add together .
Rt = R1 + R2
2 If are parallel, do the same thing but the inverse of each resistance .
Rt =1/R1 + 1/R2
Final answer:
The total resistance in a circuit with series and parallel components can be calculated by summing the resistances in series and using the reciprocal rule for resistors in parallel, before combining the two results.
Explanation:
To calculate the total resistance in a circuit, one must know the configuration of the resistors, whether they are in series, parallel, or a combination of both. The student's question suggests they are dealing with a combination of series and parallel circuits, requiring different approaches for each section.
For resistors in series, the total resistance, Rtot, is the sum of all individual resistances. So, if we have resistors R1, R2, and R3 in series, the Rtot would simply be R1 + R2 + R3.
In a parallel configuration, the total resistance, Rp, is found using the formula 1/Rp = 1/R2 + 1/R3. After calculating Rp, if this parallel combination is in series with another resistor R1, then the overall total resistance is Rtot = R1 + Rp. To get the value of Rp, one would calculate the reciprocal of the sum of the reciprocals of the individual resistances in parallel, and then take the reciprocal of that result.
By following these rules, and using the correct units and values given for the resistors, students can accurately determine the total resistance of various circuit configurations.
14. Looking ahead: Give an example of how the Law of Conservation of Energy applies to eating your favorite meal. Give at least 2 energy transformations.(5 pts)
Answer:
The law of conservation of energy applies to eating your favorite food in that the energy contained in the food is being converted to energy usable for the body system after the final digestion(Glucose or simple sugar, amino acid, etc)
Examples of transformation of energy include
(1) Transformation from Chemical energy in battery to light energy in bulb
(2) Transformation of Electrical energy to thermal/Heat energy in electric stove.
Explanation:
The law of conservation of energy states that energy can neither be created or distroy. It can only by converted from one form to another.
Final answer:
The Law of Conservation of Energy states that energy cannot be created or destroyed, but can be transformed. When eating your favorite meal, the chemical energy in the food is transformed into mechanical energy (chewing) and thermal energy (digestion).
Explanation:
The Law of Conservation of Energy states that energy cannot be created or destroyed, but it can be transformed from one form to another. This applies to eating your favorite meal because the food you eat contains chemical energy, which is then converted into other forms of energy as your body digests and metabolizes the food. Two examples of energy transformations in the process of eating your favorite meal are:
1. Chemical to Mechanical Energy: When you chew your food, the muscles in your jaw contract and expand, converting the chemical energy in the food into mechanical energy.
2. Chemical to Thermal Energy: As your body breaks down the food, chemical reactions take place, releasing heat energy in the form of thermal energy.
Solar System 101: How is Venus’ rotation different than most planets? Question 3 options: A.It spins the opposite direction of most planets. B.It is hotter. C.It doesn't rotate. D.It spins the same as Earth.
A. It spins the opposite direction of most planets
Explanation:
Venus is not close to earth but still, it is very hot. Venus's atmosphere consists of a thick layer of greenhouse gases, carbon dioxide and the clouds in Venus is made up of sulfuric acid.The rotation of Venus is very slow, it takes around 243 days compared with earth to finish one rotation. Venus is different because it spins in the opposite direction to earth and also to most of the other planets.Venus does not have moons as mercury.(d) A beam of white light shines onto a sheet of white paper. An identical beam of light shines onto a mirror. The light is scattered from the paper and reflected from the mirror.
Final answer:
The question relates to how white light spreads out or reflects on a white paper and a mirror, governed by the law of reflection in Physics. Diffused light allows a sheet of paper to be visible from multiple angles, while a mirror reflects light at specific angles based on its smooth surface.
Explanation:
The question pertains to the law of reflection in Physics, looking specifically at how light behaves when shining on different surfaces. When a beam of white light shines onto a sheet of white paper, the light is scattered, or diffused, due to the roughness of the paper's surface. This scattering allows the paper to be seen from various angles. In contrast, when the identical beam shines onto a mirror, the light is reflected because of the mirror's smooth surface.
The reflection adheres to the law of reflection, which states that the angle of reflection equals the angle of incidence (θr = θi). White light on yellow paper and yellow light on white paper will result in color changes due to the colors being absorbed or reflected, whereas red and green lights on white paper may combine to produce a different color perception depending on the superposition of the lights.
11. Name given to the elements located in group 2.
a. Noble gases
c. Alkaline earth metals
b. Halogens
d. Alkali metals
Answer:
c. Alkaline earth metals
Explanation:
Why does every element except hydrogen need at least one neutron and its nucleus?
Answer:
It needs attractive force from the strong nuclear interaction to counter the electrostatic repulsion between the protons.
Explanation:
It has to counter
Final answer:
Other elements apart from hydrogen need at least one neutron in their nuclei to stabilize the electrostatic repulsion between protons. Neutrons add to the atomic mass and contribute to the stability of atoms. The varying number of neutrons leads to different isotopes of an element which is an essential factor in the structure and behavior of elements.
Explanation:
Neutrons play a key role in the stability of an atom. While hydrogen, with an atomic number of 1, can exist without neutrons in its nucleus, other elements require neutrons to offset the electrostatic repulsion between protons, which are all positively charged. The presence of neutrons in the nucleus contributes to the atomic mass and helps to maintain the stability of atoms as it keeps the protons from repelling each other and breaking the nucleus apart.
Isotopes are versions of the same element with a different number of neutrons, leading to variations in their atomic mass. For example, helium has an atomic number of 2 and an atomic mass of 4 because it has two neutrons in addition to two protons. As we move across the periodic table, the ratio of neutrons to protons in the nucleus generally increases, aiding in the stability of heavier elements.
The atomic mass of an element is not simply its atomic number (the number of protons) but the combination of the number of protons and neutrons. Protons and neutrons have nearly identical masses, and each contributes significantly to the mass of an atom. This concept is integral when considering the structure and behavior of elements and in understanding the composition of the human body, which is largely made up of elements like oxygen, carbon, and hydrogen.
Burning oil and coal adds to the atmosphere.
A)phosphorous
B)carbon dioxide
C)oxygen
Answer:
carbon dioxide
Explanation:
These graphs show measurements of the density of air as different sound waves pass a single point.
Which sound wave will most likely be perceived as the loudest?
Answer: D!
It is the option with the greatest amplitude.
Answer: The graph with the highest density of air.
Explanation: The graphs are missing, but il try to explain this problem anyways.
Soundwaves are mechanical waves, that need a medium to move (commonly, the medium is the air)
As those mechanical waves affect the air, the density of air in some areas increase and in others decrease, and when that "wave of air" impacts a receptor, like your ear, you receive the information of the sound, like pitch and intensity.
As more air impacts the receptor, more "loud" is the noise, and as you may know, density = mass/volume, so as biggest is the density of air in a point, this means that we have more mass of air at that point, which is directly related to the intensity or loudness of the sound wave at that point
With what velocity Must a 0.53 kg softball be moving to be equal to the momentum of a 0.31 kg baseball moving at 21 m/s
Answer:12.28m/s
Explanation:
momentum of baseball =mass of baseball x velocity of baseball
Momentum of baseball =0.31x21
Momentum of baseball =6.51kgm/s
For a softball to have same momentum with the baseball we can say :momentum of baseball =mass of softball x velocity of softball
6.51=0.53 x velocity of softball
Velocity of softball =6.51/0.53
Velocity of softball =12.28m/s
The velocity of the softball that must be equal to the momentum of the baseball is 12.28 m/s.
The given parameters;
mass of the soft ball, m₁ = 0.53 kgmass of the baseball, m₂ = 0.31 kgvelocity of the baseball, u₂ = 21 m/sApply the principle of conservation of linear momentum to determine the velocity of the softball;
[tex]m_1u_1 = m_2 u_2\\\\u_1 = \frac{m_2 u_2}{m_1} \\\\u_1 = \frac{0.31 \times 21}{0.53} \\\\u_1 = 12.28 \ m/s[/tex]
Thus, the velocity of the softball that must be equal to the momentum of the baseball is 12.28 m/s.
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Mechanical energy that has been "lost" to friction has actually been
destroyed
O
A. True
OB. False
SUBMIT
help
Answer:
it false, APEX, i just did this one
Explanation:
Answer:
False
Explanation:
The law of conservation of energy states that energy can neither be created nor destroyed - only converted from one form of energy to another.
A car travels 300 km in 6 hours. What is the average speed of the car (in km/hr)
The average speed of the car that travels 300 km in 6 hours is 5 km/hours.
HOW TO CALCULATE AVERAGE SPEED:
The average speed of a moving object can be calculated by dividing the distance moved by the time taken as follows:Average speed (km/hr) = distance (km) ÷ time (hr)According to this question, a car travels at 300 km in 6 hours. The average speed can be calculated as follows:Average speed = 300km ÷ 6hrsAverage speed = 5km/hr.Therefore, the average speed of the car that travels 300 km in 6 hours is 5 km/hours.Learn more at: https://brainly.com/question/17289046?referrer=searchResults
What is an example of a non contact force
Answer: Gravitational force
Explanation:
A non contact force can be described as a force applied to an object by another body that is not in direct contact with it.
For example, an object thrown upwards will return back due to the force of gravity acting on it. So, it means Gravitational force is acting on the body without necessarily being in contact with that body.
Phys 131 HW#2
Q#1 Red laser beam enters hits glass/ water interface with an angle of 30° find the
angle of the refracted beam in the water. (20)
Angle of refraction: [tex]34.6^{\circ}[/tex]
Explanation:
Refraction is a phenomenon that occurs when light crosses the interface between two mediums.
When this occurs, the ray of light bends, according to Snell's law:
[tex]n_1 sin \theta_1 = n_2 sin \theta_2[/tex]
where
[tex]n_1,n_2[/tex] are the index of refraction of the two mediums, respectively
[tex]\theta_1[/tex] is the angle of incidence (the angle between the incident ray and the normal to the surface)
[tex]\theta_2[/tex] is the angle of refraction (the angle between the refracted ray and the normal to the surface)
In this problem, we have:
[tex]n_1 = 1.513[/tex] (index of refraction of glass for red light)
[tex]n_2 = 1.331[/tex] (index of refraction of water for red light)
[tex]\theta_1=30^{\circ}[/tex] (angle of incidence)
Therefore, the angle of refraction is:
[tex]\theta_2 = sin^{-1}(\frac{n_1}{n_2}sin \theta_1)=sin^{-1}(\frac{1.513}{1.331}sin 30^{\circ})=34.6^{\circ}[/tex]
The angle of the refracted beam in the water is approximately 22.04 degrees.
To find the angle of the refracted beam in the water, we use Snell's Law, which relates the angle of incidence, the angle of refraction, and the indices of refraction of the two media. Snell's Law is given by:
[tex]\[ n_1 \sin(\theta_1) = n_2 \sin(\theta_2) \][/tex]
where:
[tex]- \( n_1 \) i[/tex]s the index of refraction of the first medium (air in this case),
[tex]- \( \theta_1 \)[/tex] is the angle of incidence in the first medium,
[tex]- \( n_2 \[/tex]) is the index of refraction of the second medium (water in this case),
[tex]- \( \theta_2 \)[/tex]is the angle of refraction in the second medium.
Given that the angle of incidence [tex]\( \theta_1 \)[/tex] is 30 degrees, and assuming the index of refraction for air [tex]\( n_1 \)[/tex]is approximately 1 (since it is very close to 1), and the index of refraction for water \( n_2 \) is about 1.33, we can rearrange Snell's Law to solve for[tex]\( \theta_2 \):[/tex]
[tex]\[ \sin(\theta_2) = \frac{n_1}{n_2} \sin(\theta_1[/tex]
[tex]\[ \sin(\theta_2) = \frac{1}{2.66} \][/tex]
[tex]\[ \sin(\theta_2) \approx 0.3758 \][/tex]
Now, we take the inverse sine (arcsine) to find the angle [tex]\( \theta_2 \):[/tex]
[tex]\[ \theta_2 = \arcsin(0.3758) \][/tex]
[tex]\[ \theta_2 \approx 22.04^\circ \][/tex]
Therefore, the angle of the refracted beam in the water is approximately 22.04 degrees."
The Milky Way measures _________ light years in diameter.
Answer:
The Milky Way is about 1,000,000,000,000,000,000 km (about 100,000 light years or about 30 kpc) across. The Sun does not lie near the center of our Galaxy. It lies about 8 kpc from the center on what is known as the Orion Arm of the Milky Way.
2. What is another term, one you'll find
on an iPod, for amplitude?
Answer:
volume
Explanation:
Another term for amplitude is height. The maximum displacement that a longitudinal wave, like the sound wave.
What is amplitude?The greatest movement of any point existing just on string from its location when the string would be at rest is used to determine the amplitude of a transverse wave, like the wave on such a string that's also plucked there. The maximum displacement that a longitudinal wave, like the sound wave, may make from its equilibrium position is used to determine the wave's amplitude.
A sound is a type of energy that's also created when objects vibrate. In most cases, a medium is necessary for the propagation of sound. As a result, we may conclude that sound cannot travel in a vacuum because there is nothing for the sound waves to travel through. Another term for amplitude is height.
Therefore, another term for amplitude is height.
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