A person is walking from the front of a train toward the back of a train at a constant velocity of 3 mph. The train is moving forward at a velocity of 20 mph. What is the velocity of the walking person relative to the land outside the train?
Explanation:
This is the Galilean transformation.
V' = V - U where want to find V' in the primed frame of reference.
The primed frame is moving at speed U = -20 relative to the train.
V = -3 is the speed of the person in the frame of the train.
Then V' = -3 - (-20) = 17 mph relative to the land outside the train.
A scientist has two containers. Inside each container, there is a blue liquid. The liquids are substances. What can the scientist do to help find out whether these two liquids are both the SAME substance? *
is 45 m/s2 a scalar or a vector quantity and how do you know?
Answer:
Explanation:
it is a vector as it has a magnitude and a direction. If it was a scalar quantity it would just have a magnitude and would be 45 m. Acceleration is an example of a vector quantity
Please Answer: Which lists the waves in order of frequency, from highest to lowest? A.X-rays, gamma rays, ultraviolet B.radio waves, visible light, X-rays C.ultraviolet, microwaves, gamma rays D.visible light, infrared, microwaves
Answer:
D.visible light, infrared, microwaves
Explanation:
Answer:
visible light, infrared, microwaves
Explanation:
from highest to lowest
PLEASE ANSWER FAST!!What was significant about the clay samples from the Western Hemisphere? How was the Alvarez hypothesis modified in response?
Answer:
The Western Hemisphere contained significantly higher amounts of shock-fractured quartz. This led Walter and Luis Alvarez to hypothesize that the asteroid impact site was in the Western Hemisphere.
Explanation:
Please help me fast and i brainliest!! Two balls are released from the same height. Ball A is released on the surface of Earth, and ball B is released on the surface of the moon. The mass and net force on each ball are recorded in the table. Net Force (N) Mass (kg) Ball A 19.6 2 Ball B 9.6 6 Ball C 6.6 ? Which statement is correct about the mass of ball C, which is released on the surface of the moon from the same height? The mass of ball C is less than the masses of ball A and ball B. The mass of ball C cannot be determined from the information provided. The mass of ball C is greater than the masses of ball A and ball B. The mass of ball C is greater than the mass of ball A but less than the mass of ball B
Answer:
If they both start at the same height then most likely that means that each has an intical velocity and a net force sooooo ball A 19.6
Explanation:
Answer: The mass of ball C is greater than the mass of ball A but less than the mass of ball B.
2. A ball is dropped from a height of 52 m. The ball falls freely and reaches the ground in 75 s. What was the average speed of the ball?
Answer:
v = 0.69 m/s
Explanation:
Given that,
A ball is dropped from a height of 52 m.
The ball reaches the ground in 75 seconds
We need to find the average speed of the ball. The ball will travel a distance of 52 m in 75 s. The average speed of the ball is distance divided by time taken. So,
[tex]v=\dfrac{52\ m}{75\ s}\\\\v=0.69\ m/s[/tex]
Hence, the average speed of the ball is 0.69 m/s.
What is the smallest part of a chemical compound that has all the properties
of that compound
A. A nucleus
B. A mineral
C. An atom
D. A molecule
Answer:
D. A Molecule
Explanation:
The smallest particle of a compound that still has the properties of the compound is a molecule. It is composed of two or more bonded atoms.
The smallest part of a chemical compound that has all the properties of that compound is a molecule (option d)
In the world of chemistry, substances are composed of tiny units called atoms, and these atoms bond together to form chemical compounds.
Option A, a nucleus, refers to the central core of an atom and consists of protons and neutrons. While essential for an atom, a nucleus alone does not represent a complete chemical compound.
Option B, a mineral, is a naturally occurring inorganic substance with a specific chemical composition and a definite atomic structure. However, minerals are not the smallest parts of a chemical compound.
Option C, an atom, is the fundamental building block of matter. It consists of a nucleus (containing protons and neutrons) surrounded by electrons. While atoms are crucial for forming compounds, they are not the smallest unit that retains all the properties of a compound.
Therefore, the correct answer is Option D, a molecule. A molecule is a group of two or more atoms bonded together, representing the smallest part of a chemical compound that possesses all the characteristics and properties of that compound.
Hence the correct option is (d).
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When your body takes the chemical energy in food and transforms it so you can move, what type of energy did it transform it into?
Radiant energy
Chemical energy
Thermal energy
Mechanical energy
Answer:
chemical I think
Explanation:
hope this helps
Answer:
its actually mechanical energy
Explanation:
i took my quiz
How do you line up vectors so you can add them?
Answer:
The head-to-tail method of adding vectors involves drawing the first vector on a graph and then placing the tail of each subsequent vector at the head of the previous vector. The resultant vector is then drawn from the tail of the first vector to the head of the final vector.
Explanation:
Which statement best describes the size of the outer planets? All the outer planets are large. All the outer planets, except Saturn, are large. The inner planets are larger than the outer planets. Jupiter is a large planet, while the other outer planets are small.
Answer:
all outer planets are large
Explanation:
The sun and the planets compose the solar system. The common factor among all the outer planets is that they are large.
What are the planets?The planets constitute an essential part of the solar system. The sun is at the center of the solar system and is surrounded by the planets.
Now the earth is the third planet in the solar system. The outer planets are the planets that are all far from the sun. The common factor among all the outer planets is that they are large.
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How to keep your community clean
Answer:
Work with the local civic groups to identify and eliminate eyesores, and beautify the local environment
Pick up a piece of litter every day
Keep a litter bag in your car or your recreational vehicle so you dispose of litter properly
Create a trash fishing contest in your waterway to increase awareness about illegal dumping and littering
Write a letter to the editor of your local newspaper asking others to respect public lands and keep them clean
Help your local schools conduct recycling drives and clean-up projects
Create a beautiful green space by planting trees and shrubs in an area in need of improvement.
Ask local businesses to adopt-a-spot and take care of it
Paint and fix up playground equipment
Organize a paint-out with family and friends and create a community paintbrush mural over a wall of illegal graffiti
Recycle your old tires
Report graffiti to your local authorities
Donate your old computer equipment or dispose of it properly
Conduct a recycling drive in your neighborhood or your business
Volunteer to help your employer conduct paper recycling drives at work
Donate gently used clothes to needy organizations and shelters and identify other items that you can reuse
Compost yard and food waste and seek advice if you don’t know how
Find out how pollution in storm drain runoff can impact our aquifers and ecosystems and be passionate about doing your part to reduce litter and solid waste
Ask your local government officials to establish regular community improvement activities and to support and promote volunteer efforts
Help your library establish an environmental corner that offers books and other educational materials about taking care of the Earth
A rope is used to pull a 4.0 kg bucket of water upwards out of a deep well with an applied force 45 N. If starting from rest, what speed will the bucket have after experiencing this force for 2 seconds?
Answer:
v = 22.5 m/s
Explanation:
The speed of the bucket can be found using the following equation:
[tex] V_{f} = V_{0} + at [/tex]
Where:
[tex]V_{f}[/tex]: is the final speed =?
[tex]V_{0}[/tex]: is the initial speed = 0 (starts from rest)
a: is the acceleration
t: is the time = 2 s
We need to find the acceleration, it can be found as follows:
[tex] F = ma [/tex]
Where:
F: is the force = 45 N
m: is the mass = 4.0 kg
[tex] a = \frac{F}{m} = \frac{45 N}{4.0 kg} = 11.25 m/s^{2} [/tex]
Now, the speed is:
[tex] V_{f} = V_{0} + at = 11.25 m/s^{2}*2 s = 22.5 m/s [/tex]
Therefore, the speed that the bucket will have is 22.5 m/s.
I hope it helps you!
What do the planets have in common and how are they different?
Answer:
They vary quite a lot, yet there are some similarities
Explanation:
With Mercury, you have a hot and barren expanse of rock
With Venus, you also have a fairly hot and barren expanse of rock, with a molten core
With Earth, you have a warm/cool variant with water and a full atmosphere
With Mars, you have a colder and barren expanse of valleys and rock, with a rather paste-like ground
With Jupiter, we have our first gas giant, covered in clouds with a thick atmosphere
With Saturn, it is yet another gas giant, with rings of gas and rock and a dense core of metals, such as iron and nickel
With Uranus, it is also rather gas-full with a fair amount of water and methane, which results in its bluish color (an ice giant)
And finally with Neptune, it is the other ice giant, consisting of water, methane, and ammonia
So there are some similarities (gases, water, land formations, etc.) and some differences (rings, temperature, structure, etc.). Our planets are very unique to one another and continue to engage and surprise us.
Give two examples of pure substances and two examples of mixtures
Answer:
1 kerosene is the pure substance, salt and water is the mixture substance
Answer:
pure substansubdiamond nd sulphur. mixture:salt nd oil ,oil nd water
what does the "LINE OF BEST FIT" mean?
Answer:
Line of best fit refers to a line through a scatter plot of data points that best expresses the relationship between those points.
Explanation:
Difference between si unit and derived unit
Answer:
Derived units are derived from these 7 base units. Derived units are dependent on the base units and are not independent of each other. ... Mass has SI units of kg, distance is measured in m and t has the SI unit of second. Thus, SI unit of force is kg.
A ball thrown vertically upward is caught by the thrower after 4.00 sec. Find the initial velocity of the ball and the maximum height it reaches.
Answer:
Initial velocity = 39.2m/s
Maximum height is 78.4m
Explanation:
Given
[tex]Time, t = 4s[/tex]
Solving (a): Initial Velocity
Using first law of motion:
[tex]v = u + at[/tex]
Where
[tex]v = final\ velocity = 0[/tex]
[tex]u = iniital\ velocity = ??[/tex]
[tex]a = acceleration = -g[/tex] [g represents acceleration due to gravity]
[tex]t = 4[/tex]
Substitute these value in the above formula:
[tex]v = u + at[/tex]
[tex]0 = u - g * 4[/tex]
[tex]0 = u - 9.8 * 4[/tex]
Take g as 9.8m/s²
[tex]0 = u - 39.2[/tex]
[tex]u = 39.2m/s\\[/tex]
Hence, initial velocity = 39.2m/s
Solving (b): Maximum Height
This will be solved using second equation of motion
[tex]s = ut + \frac{1}{2}at^2[/tex]
This becomes
[tex]s = ut - \frac{1}{2}gt^2[/tex]
Substitute values for u, t and g
[tex]s = 39.2 * 4 - \frac{1}{2} * 9.8 * 4^2[/tex]
[tex]s = 156.8 - 78.4[/tex]
[tex]s = 78.4[/tex]
Hence, the maximum height is 78.4m
Calculate the average force that must be exerted on a 0.145 kg baseball in order to give it an acceleration of 130 m/s^2. (round to the nearest whole number)
Answer:
18.9 N or 19 N rounded
Explanation:
m = 0.145 kg
a = 130 m/s^2
F = ma = (0.145 kg)(130 m/s^2) = 18.9 N
Magnitude of the average force
F = 18. 9 N
There are three laws of motion that are given by Newton in order to study the Force and Inertia on the objects in motion or rest.
Newton's First Law defines Inertia
The second law gives the definition of Force
Third law states about action reaction pairs on the objects interacting with each other.
According to Newton' s second law of motion we can write equation (1)
[tex]\rm F = ma.....(1) \\\rm Where\; F = Net\; unbalanced\; external\; force\; acting\; on \; the \; system \\\\a = acceleration \; of \; center\; of\; mass\\[/tex]
Now according to the question
we can write
Mass of the baseball = 0.145 kg
Acceleration of the baseball = 130 [tex]m/s^2[/tex]
Magnitude of the average force can be find out by putting in equation (1)
F = ( 0.145 ) ( 130) = 18.85 N [tex]\approx[/tex] 18. 9 N
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What is the meaning of the universe?
Answer:
Explanation:
All existing matter and space considered as a whole; the cosmos. The universe is believed to be at least 10 billion light years in diameter and contains a vast number of galaxies; it has been expanding since its creation in the Big Bang about 13 billion years ago.
what is noncontact force
Answer:
A non-contact force is a force which acts on an object without coming physically in contact with it.
Explanation:
For example:
Gravitational force.
Magnetic force.
Electrostatics.
Nuclear force.
Answer:
Non-contact force are forces that exist(arise) without any form of contact between two objects.
Examples are ;
: Magnetic Force ;is a force that attracts certain metal objects (like iron and iron filings) towards a magnet. Electrostatic Force ;s the force exerted by a charged body on another charged or uncharged bodyGravitational force ; is a force exerted by the earth on all objects on itExplanation:
1. How many energy levels do the electrons in an atom of iron occupy?
Electrons in atoms occupy energy levels, also called electron shells, outside the nucleus. Different shells can hold different maximum numbers of electrons. The electrons in an atom occupy the lowest available energy level first.on:
Answer:
26. Brainliest?
Explanation:
Iron atoms have 26 electrons and the shell structure is 2.8.
Mrs. Franklin loves teaching science and thinks about it all the time. While walking one day, she steps on a warm, fresh piece of used gum. The gum flattens and sticks to her shoe. When she lifts her foot, she sees long strings of gum between her shoe and the sidewalk. She thinks, “What a great demonstration of the properties of metals!” What properties of metals would Mrs. Franklin most likely teach about with this demonstration?
Answer:
Ductility and Malleability
Explanation:
A kettle of water is heated on a stove. What will happen to the molecules of the water in the kettle as the kettle continues to be heated by the flame?
Answer:
The molecules will take the heat energy and convert it to mechanical energy and they get "excited" and eventually their bonds will break and they will turn into water vapor.
Two magnets are placed near each other on a space station orbiting Earth.
Their north poles are facing each other. Which statement explains what will
happen to the magnets?
O A. They will be repelled because they are in each other's magnetic
field.
B. They will not move because they have only half of a magnetic
field.
C. They will not move because they have very small gravitational
fields.
D. They will be attracted because their electric fields will add
together
Answer: A. They will be repelled because they are in each other's magnetic
field.
Explanation: Apex and gravity and electrical don't have effect on magnets magnetic field.
The statement that described the happening to the magnets should be that they will be attracted because they are in each other's magnetic.
What is a magnet?Magnet refers to the piece of iron or other material that comprise of the atoms also it inbuilt the magnetism properties like attraction of other type of iron objects. In the case when the two magnets shoud be placed near to each other also their north poles should be faced each other so it should be attracted since it is considered as the each other magnetic.
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TRUE or FALSE? If a moving object experiences an unbalanced force, then the
object will have an acceleration that is in the same direction as the unbalanced
force.
True I guess
because if the force is balanced and there is no net force, the object will not accelerate and the velocity will remain constant...
Not sure
Give two examples of mixtures in which the physical properties of the ingredients, or substance, are maintained, or NOT changed, when they are mixed together
Answer: Examples are --- Water and oil , nails and sand and are called Heterogeneous mixtures ,
Explanation:
A mixture is a combination of two or more substances without a chemical reaction which individual components having retain their properties, We have two types of mixtures
Homogeneous-- Is a mixture, whether solid liquid or gas that contains proportions in such a way that one can hardly identify each components by looking eg --air, ink etc
Heterogeneous- Is a mixture in which the physical properties of individual components are maintained eg --- Rice and beans , water and oil, nails and sand.
what's the meaning of phisikos
A word-forming element meaning "physical, physically; natural," from Latinized form of Greek physikos "natural, physical, pertaining to nature."
Please answer the questions here in the attachment I attached below. They are all multiple choice.
Answer:
abcbc
Explanation:
11. If humans continue to divert water from rivers for crops, drinking and industry, what parts of the water cycle are most affected?
A. Runoff and Accumulation
B. Evaporation and Transpiration
C. Evaporation and Precipitation