Answer:
a reference point allows you to determine the motion of an object :)
example: when your in a car and u look out the window and your moving fast than the car next to you. It seems that way because the car next to you is actually moving much slower.
Final answer:
A reference point is used to determine the position of an object, providing context for its location. A frame of reference builds upon this to include a set of directions, enabling precise measurement of displacement, which includes both magnitude and direction, making it a vector quantity.
Explanation:
A reference point allows you to determine the position of an object. This concept is instrumental when studying motion as it helps to define an object's location in a spatial context. For example, if you wanted to tell a classmate your location in a classroom, you could say that you are 2 meters from the classroom door, directly inside. Here, the classroom door serves as the reference point, and your description of being inside provides a rudimentary coordinate system, defining your position in a one-dimensional space.
A frame of reference is an extension of a reference point, which includes a set of directions to precisely describe the location of an object. In physics, the displacement of an object is defined as the vector that represents the shortest distance from the reference point to the object, providing not only the magnitude of the distance but also its direction.
Choosing different frames of reference can yield the same physical results in a problem. For instance, regardless of whether you are inside a train or standing on a platform, if you take your respective positions as the reference points, the motion observed will be coherent when analyzed from either perspective.
**20points**
When this chemical reaction occurs, the product is
A) a salt called lithium fluoride.
B) a new element is formed
C) the replacement of one element by another.
D) the decomposition of two elements, lithium and fluorine.
A woman throws her keys straight
up at 8.49 m/s. Her friend catches
them 2.89 m higher. How long were
the keys in the air?
Answer:
1.27 s
Explanation:
throwing keys are dangerous
The Milky Way galaxy contains interstellar matter that may a. Form new galaxies b. Form new stars c. Form new universes D. Form new constellations
The interstellar matter within the Milky Way galaxy primarily contributes to the formation of new stars, not new galaxies, new universes, or new constellations. Constellations are not formed but are simply patterns or configurations of stars as observed from the Earth.
Explanation:The Milky Way galaxy, which is the galaxy that contains our solar system, is composed of various forms of interstellar matter that include stars, dust, and gas. This interstellar matter has the potential to contribute to the formation of new celestial bodies. Forming new galaxies or new universes as suggested in the question, however, is not typically attributed to the interstellar matter within the Milky Way itself.
Instead, the interstellar matter in the Milky Way is primarily involved in forming new stars. This occurs when dense regions of dust and gas collapse under their own gravitational pull, thus initiating nuclear fusion and creating a new star.
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Which simple machine would be BEST to lift a heavy box to the second floor window of a building?
A) ramp
B) crow bar
C) wheel and axle
D) block and tackle
Elephants can communicate using very low frequency sound waves over long distances. An elephant makes a noise below human hearing at 16Hz. This low rumble moves at 350 m/s (speed of sound in air). This sound is detected by her friend 25 seconds later.
How far away is her friend?
Answer:
8750 m
Explanation:
S= v x t
S= 350 x 25
S= 8750 m
The elephant's friend is 8750 meters away.
The subject of this question is Physics, specifically related to sound waves and their travel. The question involves an elephant communicating with infrasound at 16 Hz and determining the distance between it and the receiver of the sound by using the speed of sound in air. To answer how far away her friend is, you would use the equation of distance traveled by the wave, which is the product of the wave's speed and the time it took to reach the receiver.
Distance = Speed of Sound × Time
Distance = 350 m/s × 25 s
Distance = 8750 m
what is the change of 890 electrons, measured in coulombs?
1 electron's charge = -1.602 x 10⁻¹⁹ Coulomb
890 electron charges = (890)·(-1.602 x 10⁻¹⁹ C) = -1.426 x 10⁻¹⁶ C
Plzz I need answer in 1 mint
Answer:
The answer is A i think :)
WILL GIVE BRAINLIEST The table below shows the orbital speed of four planets. Name of Planet Average orbital speed (km/s) Planet J 13.07 Planet E 29.78 Planet Y 47.36 Planet M 24.00 Considering Keplers Laws, which planet is likely closer to the sun? Planet J Planet E Planet Y Planet M
Answer:
planet y
Explanation:
Answer:
y
Explanation:
Hi:) I really need help with this, I’m so confused! :/
Metals tend to lose electrons to achieve a stable noble gas electronic configuration.
Do metals lose electrons to other metals
OR
Do metals lose electrons to non metals
Non-metals tend to gain electrons to achieve a stable noble gas electronic configuration
Do non metals gain electrons from other non- metals
OR
Do non-metals gain electrons from metals?
( Can someone help? )
A 6-column table with 2 rows. The first column labeled number of washers has entries 1, 2. The second column labeled initial velocity v subscript 1 (meters per second) has entries 0.11, 0.13. The third column labeled final velocity v subscript 2 (meters per second) has entries 0.28, 0.36. The fourth column labeled time to travel 0.25 meters t subscript 1 (seconds) has entries 2.23, 1.96. The fifth column labeled time to travel 0.5 meters t subscript 2 (seconds) has entries 3.13, 2.61. The sixth column labeled Acceleration a = StartFraction (v subscript 2 minus v subscript 1) over (t subscript 2 minus t subscript 1) EndFraction (meters per second squared) has entries 0.19 and empty.
The acceleration of the car with two washers added to the string would be
Answer:
Answer would be 0.33
Explanation:
Calculations
Answer:
The answer is 0.33
Explanation:
because if (v2-v1)/(t2-t1)
then if you fill it in then you could definetly get the answer.
What is earth revolution estimated time and direction
What is moon's revolution estimated time and direction
Sound waves are a type of __________ wave.
The rotation of Earth on its axis causes _______ and _______. The revolution of the Earth around the sun causes the ______.
Answer:
The revolution of the earth around the sun and the tilt of the earth's axis cause the changing of the seasons.
Explanation:
The Earth's rotation causes day and night, while its revolution causes seasons. This happens due to how the rotation exposes different parts of the Earth to the sun, and how the tilt of the Earth's axis during revolution causes varying sunlight exposure.
Explanation:The rotation of Earth on its axis causes day and night. This astronomical phenomenon happens because as the Earth rotates, different parts of it are exposed to the Sun's light, creating the cycle of day and night. On the other hand, the revolution of the Earth around the sun causes the seasons. As the Earth orbits the Sun, the tilt of our planet's axis causes different parts of the Earth to receive varying degrees of sunlight throughout the year, which results in the changes in weather conditions we know as seasons.
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What are supersonic speeds?
speeds at 343 m/s exactly
speeds above 343 m/s
speeds below 343 m/s
speeds exactly at the speed of sound
The answer is: B.
speeds above 343 m/s.
:)
Supersonic speeds is speed which is above 343. Hence option B is correct.
What is Speed ?Speed is a rate of change of distance with respect to time. i.e. v=dx÷dt. Speed can also be defined as distance over time i.e. speed= distance ÷ time. It is denoted by v and its SI unit is m/s. it is a scalar quantity. Speed shows how much distance can be traveled in unit time.
To find dimension for speed is,
from formula Speed = Distance ÷ Time
Dimension for distance is [L¹] ,
Dimension for Time is [T¹],
Dividing dimension of distance by dimension of time gives,
[L¹] ÷ [T¹] = [L¹T⁻¹]
Dimension for speed is [L¹T⁻¹].
Supersonic speed is the speed of an object that is above the speed of sound. For objects traveling in dry air of a temperature of 20 °C. Speed of the sound is 343 m/s in dry air.
Hence Option B is correct.
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How is photon energy calculated? (choose 2)
o Using Plank's constant.
o It cannot be calculated.
o Using the frequency.
Answer:
Explanation:
Based on the wave model of light, physicists predicted that increasing light amplitude would increase the kinetic energy of emitted photoelectrons, while increasing the frequency would increase measured current.
Contrary to the predictions, experiments showed that increasing the light frequency increased the kinetic energy of the photoelectrons, and increasing the light amplitude increased the current.
Based on these findings, Einstein proposed that light behaved like a stream of particles called photons with an energy of \text{E}=h\nuE=hνstart text, E, end text, equals, h, \nu.
The work function, \PhiΦ\Phi, is the minimum amount of energy required to induce photoemission of electrons from a metal surface, and the value of \PhiΦ\Phi depends on the metal.
The energy of the incident photon must be equal to the sum of the metal's work function and the photoelectron kinetic energy:
When the energy of a sound wave is transferred to a particle of a medium and causes it to vibrate and generate heat the sound wave is
A. Reflected
B. Refracted
C. Absorbed
D. Transmitted
El gas encerrado en un recipiente con las paredes rigidas esta a una presion de 150 000 Pa. La temperatura del gas es de 27°C A que temperatura en Kelvin y grados Celcius hay que calentar el gas para que la presion sea 300 000 Pa???
Answer:
The gas enclosed in a container with rigid walls is at a pressure of 150,000 Pa. The temperature of the gas is 27 ° C. At what temperature in Kelvin and degrees Celcius does the gas have to be heated so that the pressure is 300,000 Pa?
Explanation:
Given that,
When the temperature is 27°C, it's pressure is 150,000 Pa
Then,
T₁ = 27°C
Let convert to Melvin
T₁ = 27 + 273 = 300K
P₁ = 150,000 Pa
What's the temperature when it is heated to a pressure of 300,000 Pa
T₂ =?
P₂ = 300,000 Pa
Since the gas is in a rigid wall container then the volume does not change so,
V₁ = V₂
Using Gay Lussac law,
P₁ / T₁ = P₂ / T₂
Making T₂ subject of formula
T₂ = P₂ × T₁ / P₁
T₂ = 300,000 × 300 / 150,000
T₂ = 600K
So, converting to °C
°C = K - 273
°C = 600 - 273
°C = 327 °C
Then, the final temperature at 300,000 Pa is 600K OR 327°C
So, using Spanish
Dado que,
Cuando la temperatura es de 27 ° C, su presión es de 150,000 Pa
Entonces,
T₁ = 27 ° C
Deje convertir a Melvin
T₁ = 27 + 273 = 300K
P₁ = 150,000 Pa
¿Cuál es la temperatura cuando se calienta a una presión de 300,000 Pa?
T₂ =?
P₂ = 300,000 Pa
Como el gas está en un contenedor de pared rígido, el volumen no cambia,
V₁ = V₂
Usando la ley Gay Lussac,
P₁ / T₁ = P₂ / T₂
Hacer T₂ sujeto de fórmula
T₂ = P₂ × T₁ / P₁
T₂ = 300,000 × 300 / 150,000
T₂ = 600K
Entonces, convirtiendo a ° C
° C = K - 273
° C = 600 - 273
° C = 327 ° C
Entonces, la temperatura final a 300,000 Pa es 600K o 327 ° C
Ocean waves are hitting a beach at a rate of 3.5 Hz. What is the period of the waves?
Answer:
a body is projected harizontally with a velocity of 25m/ s of a tower for high caculate 1 the time of flight 2 the harizontal range 3 the velocity with which it lit the ground
Which of the following is an example of how pictures of a planet's surface can provide evidence about the planet's natural resources?
A.
Pictures showing craters suggest the presence of gold.
B.
Pictures showing clouds suggest the presence of free oxygen.
C.
Pictures showing rocks suggest the presence of natural gas.
D.
Pictures showing valleys suggest the presence of water.
Final answer:
Pictures of valleys on a planet's surface can indicate the presence of water, a critical natural resource, whereas other features like craters or rocks might suggest different geological aspects but not specific resources.
Explanation:
When considering pictures of a planet's surface to provide evidence about the planet's natural resources, there are specific indicators to look for. For instance, valleys often signify past or present water flow, as they are typically formed by this process. Figure 10.30 from Gale Crater and Underground Ice Deposits demonstrates this, showing cross-bedded sandstone, which geologists interpret as evidence of liquid water activity. Therefore, valleys on a planet's surface can indicate the presence of water, which is a crucial natural resource. Other features, such as craters or rocks, may suggest geological activity, age, or the presence of minerals, but not necessarily specific resources like gold or natural gas without additional data.
PLZZZ HELP!!!
Why does a siren have a higher pitch as it approaches you?
The amplitude of the sound wave is increased.
The crests of the sound wave are spaced closer together.
The troughs of the sound wave are farther apart.
The period of the sound wave is increased.
Answer:
The crests of the sound wave are spaced closer together.
Explanation:
the wavelength between successive crests is decreased due to the motion of the truck in the same direction as the sound
Answer and Explanation: The Doppler effect is a change in the frequency of sound waves that occurs when the source of the sound waves is moving relative to a stationary listener. As the source of sound waves approaches a listener, the sound waves get closer together, increasing their frequency and the pitch of the sound.
Hopefully that helped!
Which countries have high productivity, but are not among the top 10 for human development? Check all that apply.
Australia
France
Singapore
Canada
Belgium
Luxembourg
Iceland
Answer:
Belgium
France
Luxembourg
Explanation:
These are the ones that are in the High Productivity chart, but not in the HDI chart
The countries have high productivity, but are not among the top 10 for human development are Belgium, France and Luxembourg.
What is productivity?
Productivity is the making the maximum use of any product or time or machine.
The ones that have high productivity, but not in the human development chart are Belgium, France and Luxembourg.
The productivity is also achieved by the humans, but what if human is not developing.
Productivity and human development must be on the same balance for any country.
Thus, correct options are Belgium, France and Luxembourg.
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During which type of change can an atom of carbon become an atom of nitrogen?
A. Chemical
B. Physical
C. Nuclear
D. Phase
Answer:
C.) Nuclear
Explanation:
Answer:
it's C
Explanation:
Which set of magnets correctly illustrates the attraction of unlike poles?
Answer:
The fundamental law of magnetism states that like poles repel and unlike poles attracts each other
North and South = attraction
South and North = attraction
Explanation:
What are magnetic poles?
The magnetic poles are the two points at The end of a magnetic bar in which the magnetic properties are most pronounced.
When two opposite magnetic poles are close, they attract each other. When like poles are pushed together, there is a force of repulsion. The rule for magnets is that like poles repel and unlike poles attract.
Answer:
C.) Set C
( It says unlike poles)
Can you solve it descriptively . thanks
static question
If the applied load F causes Mx
(-77 N.mm) and Mz
(-81 N.mm) at origin then
determine the My
at origin where d=27 mm
Answer:
[tex]|M_y| = 170.82 \ N.mm[/tex]
Explanation:
From the diagram affixed below completes the question
Now from the diagram; We need to resolve the force at point A into (3) components ; i.e x.y. & z directions which are equivalent to [tex]F_x \ , F_y \ , F_z[/tex]
So;
[tex]F_x[/tex] = positive x axis
[tex]F_y =[/tex] Negative y axis
[tex]F_z[/tex] = positive z axis
Then;
[tex]|M_x| = F_y *27-F_z*11 = 77 ----- equation(1) \\ \\ |M_z| = F_y*4 - F_x*11 = 81 ---- equation (2) \\ \\ |M_y| = F_x *27 - F_z *4 = ? ---- equation (3)[/tex]
From equation (1); Let's make [tex]F_y[/tex] the subject of the formula ; then :
[tex]F_y = \frac{77+11F_z}{27}[/tex]
Substituting the value for [tex]F_y[/tex] into equation (2) ; we have:
[tex](\frac{77+11F_z}{27})4-F_x*11=81 \\ \\ 11(\frac{7+F_z}{27} ) 4- F_x -11 =81 \\ \\ 28+4 F_z - 27F_x = \frac{81*27}{11} \\ \\ 4F_z - 27F_x = 198.82 -28 \\ \\ 4F_z - 27F_x = 170.82 \\ \\ Since \ |M_y| = 4F_z-27F_x \\ \\ Then: \\ \\ \\ |M_y| = 170.82 \ N.mm[/tex]
Describe the method by which an electrical potential developed in generators and thermocouple?
Thermoelectric generator is the method by which an electrical potential developed in generators and thermocouple.
Explanation:
A thermoelectric generator (TEG), is otherwise known as a Seebeck generator, it is a solid-state device that directly converts heat flux into electrical power by a phenomenon called a Seebeck effect.Thermoelectric generators operate like heat engines except they are less voluminous and have no movable parts. TEGs are therefore usually more costly and competitive and it's efficient is less.Thermoelectric generators may be used in power plants to transform excess heat into extra electrical power, and in machines to improve fuel efficiency.Answer:
Electric generators develop an electric potential via magnetic induction. Moving a conducting rod through a magnetic field that exists between the poles of a horseshoe magnet causes an electric potential to be set up in the rod. Free electrons move through this rod from one end to the other for as long as movement of the rod is maintained. The direction of this movement depends on whether the rod is moved across the lines of force in the magnetic field in either the opposite direction or the same direction. Generators usually consist of multiple conductors mounted on a cylinder that rotates in a magnetic field.
Thermocouples utilize heat to develop an electric potential. Two strips of different metals are connected at one end to form a junction and the other ends are kept apart. A heat source is applied to the junction; this causes each metal strip’s temperature to rise at the junction. The free ends aren’t as hot and electric charges are produced at these free ends. Because the strips consist of different materials, there's a difference of potential between these free ends; when connected by a conducting wire, the electrons can move through the pathway. The voltage that's produced will become greater as the difference in temperature between the free ends and the junction increases.
Which description best explains why the view within the rectangle lens is different than the view outside the lens?
Light waves are restricted to a single plane through the lens.
Light waves disperse in multiple directions through the lens
Light waves disperse in various planes through the lens.
Light waves refract in multiple directions through the lens.
Answer:
A) Light waves are restricted to a single plane through the lens.
Explanation:
Took the quiz and got it right
Final answer:
The view inside a lens differs from the outside because light waves refract in multiple directions within the lens, a process essential for lenses to form images by bending light.
Explanation:
The view within the rectangle lens is different than the view outside the lens because light waves refract in multiple directions through the lens. When light waves enter the lens, they experience refraction both when they enter and exit the lens medium. The concept of refraction is inherently three-dimensional and is based on the principle that when light passes through variations in matter, its direction changes due to the different speeds at which light travels in different media. This bending of light is essential for lenses to redirect light and form images, whether they are magnified, shrunk, or inverted.
Lenses like the eye's crystalline lens or a microscope's glass lens use refraction to form images by bending light towards or away from the line perpendicular to the boundary surface. The thin lens approximation simplifies this process by considering the double refraction through the lens as a single change in path occurring at the plane of the lens. An example of this principle in action would be rays of light entering a diverging lens and appearing to originate from its focal point due to their diverging paths.
A ray in air hits the surface of water at 41.0 deg. At what angle does it travel in the water?
(Unit=deg)
Answer:
r = 29.53 degrees
Explanation:
Given that,
Angle of incidence, [tex]i=41^{\circ}[/tex]
We need to find the angle at which it will travel in the water. The refractive index of water is 1.33 and refractive index of air is 1. Using Snell's law as :
[tex]n_1\sin i=n_2\sin r[/tex]
r is the angle of refraction
[tex]\sin r=\dfrac{n_1}{n_2}\sin i\\\\\sin r=\dfrac{1}{1.33}\times \sin (41) \\\\r=\sin^{-1}(0.493)\\\\r=29.53^{\circ}[/tex]
So, the ray will travel at an angle of 29.53 degrees in the water.
Answer:
29.53
Explanation:
right on acellus
Which of the following is a field force
Answer:
magnetic, gravity, electrostatic all are field forces
Explanation:
help this help! :)
Among the options provided, both magnetic force and electric force are examples of field forces. Thus, option 1 and 2 is correct.
Explanation:Magnetic force arises due to the interaction between moving charges or magnetic dipoles in a magnetic field. It is responsible for phenomena such as the attraction or repulsion between magnets, the operation of electric motors, and the behavior of charged particles moving through magnetic fields. Magnetic fields are produced by moving charges or currents, creating a force that acts on other moving charges within the field.
Electric force, similarly, arises from the interaction between charged particles within an electric field. This force is responsible for the attraction or repulsion between charged objects, the operation of devices like capacitors, and the behavior of charged particles in electric fields. Electric fields are created by static charges or changing magnetic fields, exerting a force on other charged particles within the field.
Both magnetic and electric forces are examples of field forces because they are transmitted through fields (magnetic or electric fields, respectively) and act at a distance without direct contact between the interacting objects. Conversely, normal force and gravitational force are contact forces, as they require physical contact between objects to manifest.
Can someone help me with these net force diagrams?
Answer:
its like game controlls the 1st doesnt move R L R R R R it matters on the arrows pay attention to the directions take the arrows away then put them back to see what u get 1 at a time its newtons third law
Explanation:
Which of these statements accurately describe uses of ultrasound technology? Check all that apply.
It is unsafe to use for industrial applications.
It can be used to clean small items like jewelry.
It can be used to clean large items like machinery.
It increases the production time of everyday materials.
It cannot be used in the presence of liquids like water.
It can be used to clean small items like jewelry
It can be used to clean large items like machinery
Statements 2 and 3 accurately describe the uses of ultrasound technology.
It is a widely used technology in all fields.
What is ultrasound technology?
Diagnostic ultrasonography, commonly known as sonography is an imaging technique that produces pictures of inside body structures using high-frequency sound waves.
The pictures can aid in the diagnosis and treatment of a wide range of illnesses and ailments.
The ultrasound wave helps in the following applications;
1. It can be used to clean small items like jewelry.
2. It can be used to clean large items like machinery.
Hence statements 2 and 3 accurately describe the uses of ultrasound technology.
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