Answer:
hola
Explanation:
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A 1800 kg car moving south at 17.5 m/s collide with a 2800 kg car moving north. The cars stick together and move as a unit after the collision at a velocity of 5.22 m/s to the north. Find the velocity of the 2800 kg car before the collision
Answer:
v₀₂ = -2.67 m / s
Explanation:
Let's use the conservation of the moment, for this we define a system formed by the two cars.
Consider the north direction as positive and the subscript 1 will be used for car 1 and the subscript 2 for the second car
Initial instant. Before the crash
p₀ = -m₁ v₀₁ + m₂ v₀₂
Final moment. Right after the crash
p_f = (m₁ + m₂) v
p₀ = p_f
-m₁ [tex]v_{o1}[/tex] + m₂ v_{o2} = (m₁ + m2) v_{f}
v₀₂ = [tex]\frac{(m_1 +m_2) v }{m_2}[/tex]+ [tex]\frac{m_1 v_{o1} }{m_{1} }[/tex]
let's calculate
v₀₂ = [tex]\frac{(1800 +2800) 5.22 + 1800 (-17.5)}{2800}[/tex]
v₀₂ = -2.67 m / s
the negative sign indicates that the carriage moves in the opposite direction of the temperies
- calculate the BMI for a person who is 5'1" and weighs 172 pounds. Before you
calculate the BMI you must convert the height into meters and the weight into kg. You can use
the internet to convert them.
A. 32.9
B. .03
C. 184.86
THIS IS FOR PE PLEASE HELP JTS FOR EXTRA CREDIT
Answer:
It is 32.9
Explanation:
ILL GIVE BRAINLY AND THIS IS 15 POINTS PLZZZ HELPPPPPP
The best thermal insulators _____________________.
have free electrons.
are metals.
conduct heat well.
are gases.
Answer:
have free electrons
Explanation:
they are loosely bound and free to move through the material
5. What do you think? At a baseball game, when you are far from the batter, you might see the batter hit the ball before you hear the sound of the hit. Why do you think this
happens?
Answer:
The speed of sound in air is lower compared to in solids and liquids.
Explanation:
Sound is a wave that can be generated by a vibrating body. Its speed through different media differs due to the nature of the media.
Since the molecules of solids are closely packed, sound can be easily transferred from one molecule to another at a faster rate. Thus, the high speed of sound in solids.
In liquids, the molecules are not as closely packed as solids. So that the speed of sound though liquids is lower compared to that of solids. Gases has its molecules farther apart, thus making the speed of sound through it the lowest compared to solids and liquids.
Therefore the sound of the batter hitting the ball is heard latter, due to its lower speed through the air.
What two factors affect work?
Answer:
Money and health?
Explanation:
Answer:
force and displacement.
Explanation:
force and displacement.
It took 50 joulss to push a char 5 meters across the floor. With what force was the chair pushed?
Answer:
10 newtons
Explanation:
Work = Force * Distance
50 J = F * 5m
F = 50 / 5 = 10N
What type of boundary is shown in the diagram?
Answer:Divergent boundaries -- where new crust is generated as the plates pull away from each other.
Convergent boundaries -- where crust is destroyed as one plate dives under another.
Transform boundaries -- where crust is neither produced nor destroyed as the plates slide horizontally past each other.
Explanation:
IS THIS CORRECT???...........................
Answer:
A. consumers
B. multi-cellular
Explanation:
Only plants have chlorophyll and only plants have a cell wall so C and D are out of the window. They are consumers because, they don't have photosynthesis so they have to eat. They are multi-cellular because, animals all have at least a brain, body, etc. Which all need millions of cells.
In which general compass traction is this hurricane moving
Answer:
It looks like its moving north.
Explanation:
Using a box covered with graph paper allows you to simulate which aspect of a car crash?
Answer:
a computer modeling
Explanation:
The outside diameter of your teacher's rear bicycle tire is 16 inches. How far will he travel if the rear wheel makes 1200 revolutions on the road?
Answer:
241,274.32 inches
Explanation:
How far will he travel if the rear wheel makes 1200 revolutions on the road?
Since the rear wheel makes one revolution in the distance of a circumference of a circle, C with diameter, d = 16 inches
C = πd²/4
So, the distance, travelled in 1200 revolutions is D = 1200 × C = 1200πd²/4
Substituting d = 16 into D, we have
D = 1200πd²/4
D = 1200π(16)²/4
D = 76800π
D = 241,274.32 inches
How long does it take a train accelerating from 25.4 m/s to 81.2 m/s to cover 2130 m?
A. 40.0 s
B. 76.3 s
C. 20.0 s
D. 38.2 s
Answer:
C: 20.0s
Explanation:
I WILL MARK BRAINLIST PLEASE HELP!
Describe how the motion of the particles within the popcorn changes as thermal energy is transferred. How do they start out? How does that change? What other transformations occur?
Answer:
Generally, when thermal energy is transferred to a material, the motion of its particles speeds up and its temperature increases. There are three methods of thermal energy transfer: conduction, convection, and radiation. ... Convection transfers thermal energy through the movement of fluids or gases in circulation cells.
Explanation:
Answer:
Why do you think transferring energy into or out of a substance can change the molecules’ freedom of movement?
Explanation:
We know that transferring energy can cause a change in molecules' freedom of movement. Another way to say this is that transferring energy into or out of a substance can cause a phase change.
All of the following are sources of calories except HELP ASAP!!!
Answer:
vitamins don't contain calories
A pizza delivery person drives 3 miles North then 5 miles West and then 3 miles South to deliver a pizza. What is the person's displacement?
A. 45 miles
B. 8 miles
C. 11 miles
D. 5 miles west
Answer:11
Explanation:
Just did it
Answer: it’s 11
Explanation:
I just did the question
Why is physical activity important?
O It helps keep you healthy.
It helps control your weight
It helps imcove your balance and coordination
All of the Above
at least one activity you can enjoy to help you get your 60 min
Answer:
All of the Above
walking
A person on a daily diet of 2,500 calories should get no_more than
calories from fat each day.
Answer:
35%
Explanation:
Answer:
its 83
Explanation:
A sample of hydrogen at 1.5 atm had its pressure decreased to 0.50 atm producing a new volume of 750 mL. What was its original volume?
245 ml
345 ml
123 ml
250.mL
Answer:
245 ml
Explanation:
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The original volume of the sample of hydrogen is 250 mL. The correct option is the fourth option 250mL
From the question,
We are to determine the original volume of the hydrogen.
To do this,
We will use the Boyle's law formula
Boyle's law states that "the volume of a fixed mass of gas is inversely proportional to its pressure, provided that the temperature remains constant."
From Boyle's law we have that
P₁V₁ = P₂V₂
Where P₁ is the initial pressure
V₁ in the initial volume
P₂ is the final pressure
and V₂ is the final volume
From the question,
P₁ = 1.5 atm
P₂ = 0.50 atm
V₂ = 750 mL
Put the above parameters into the Boyle's law equation
P₁V₁ = P₂V₂
Then, we get
1.5 × V₁ = 0.50 × 750
1.5 × V₁ = 375
∴ V₁ = 375 ÷ 1.5
V₁ = 250 mL
Hence, the original volume of the sample of hydrogen is 250 mL. The correct option is the fourth option 250mL
Learn more here: https://brainly.com/question/12717895
A force that tries to slow things That are moving through air
Answer:
A force that tries to slow things down that are moving through air. It is a type of friction. Air resistance and water resistance are both sometimes called drag.
If a train is moving 10 m/s, how long would it take the train to go 2200 m
Answer:
220 seconds
Explanation:
Is potential energy higher at the equilibrium position?
What happens to waves near the shore?
Answer As a wave travels across the open ocean, it gains speed. When a wave reaches a shallow coastline, the wave begins to slow down due to the friction caused by the approaching shallow bottom. ... Think of it like driving a car at high speed and then slamming on the breaks. Everything is going to fly to the front.:Waves at the Shoreline: As a wave approaches the shore it slows down from drag on the bottom when water depth is less than half the wavelength (L/2). The waves get closer together and taller. ... Eventually the bottom of the wave slows drastically and the wave topples over as a breaker. hope this helps have a nice night❤️❤️❤️
Explanation:
Prompt Write about what you have learned about parts of the atom and the
Periodic Table. Explain why itis imposant to know about them.
Answer:
The table can be used to predict the properties of elements, even those that have not yet been discovered. Columns (groups) and rows (periods) indicate elements that share similar characteristics. The table makes trends in element properties apparent and easy to understand. The table provides important information used to balance chemical equations. Atoms are important because they form the basic building blocks of all visible matter in the universe. There are 92 types of atoms that exist in nature, and other types of atoms can be made in the lab. The different types of atoms are called elements. Hydrogen, gold and iron are examples of elements comprised of unique types of a single kind of atom.
Explanation:
2.
______ is stored energy due to its position.
Answer:
Potential energy
u welcome lol
A person drives for 1.00 h at 10.0 km/h and 2.00 h at 20.0 km/h. What is their average speed, in SI units?
A.
4.63 m/s
B.
16.7 km/h
C.
10.3 mph
D.
16.7 m/s
A 4.0 kg 4.0kg4, point, 0, start text, k, g, end text box slides with an initial speed of 3.0 m s 3.0 s m 3, point, 0, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction towards a spring on a frictionless horizontal surface. When the box hits the spring, the spring compresses and stops the box momentarily. The spring constant k = 125 N m k=125 m N k, equals, 125, start fraction, start text, N, end text, divided by, start text, m, end text, end fraction.
Answer:
x = 0.537 m
Explanation:
In this exercise we are asked to find the distance that the spring is compressed, let's use the concepts of conservation of energy
starting point. Before touching the spring
Em₀ = K = ½ m v²
final point. When the spring has maximum compression
[tex]E_{f}[/tex] = [tex]K_{e}[/tex] = ½ k x²
as there is no friction the mechanical energy is conserved
Em₀ = Em_f
½ m v² = ½ k x²
x = [tex]\sqrt{\frac{m}{k} }[/tex] v
let's calculate
x = RA[tex]\sqrt{\frac{4.0}{125} }[/tex] 3.0
x = 0.17888 3.0
x = 0.537 m
Answer:
0.54
Explanation:
You round the original number with two significant digits
0.537 has to be 0.54
Can someone help me with these questions pls
A man drives south to work every day. If his 55 mile
commute usually takes 0.75 hours, what is his average velocity?
Answer:
73.34 mph to 2dp
Explanation:
veolcity = distance/ time
55 / 0.75 = 73.34 mph
You are planning an investigation that explores the properties of matter. Which of the following will help you discover a physical property?
Experiment: place a powder into a beaker that contains a liquid/Result: the beaker gets hotter
Experiment: place a powder into a beaker that contains a liquid/Result: the solid dissolves into the liquid
Experiment: place a powder into a beaker that contains a liquid/Result: the mixture begins to fizz and bubble
Experiment: place a powder into a beaker that contains a liquid/Result: the mixture catches fire and burns down the lab
Answer:
I will post your answer soon
Explanation:
If you are planning an investigation that explores the properties of matter, then experiment: place a powder into a beaker that contains a liquid Result : the beaker gets hotter will help you discover a physical property.
What is experiment ?An experiment is a technique used to confirm or deny a hypothesis, as well as assess the possibility or effectiveness of something that has never been done before. Experiments show what happens when a certain component is modified, which sheds light on cause-and-effect relationships. The purpose and scope of experiments vary widely, but they always rely on a repeatable process and a rational examination of the outcomes. Natural experimental experiments are also a thing.
While a child may conduct simple experiments to better understand how objects fall to the ground, scientific teams may spend years conducting thorough research to increase their understanding of a phenomenon.
This experiment shows enthalpy is positive, heat is absorbed in this experiment. this breaks the atoms and it needed the energy.
To know more about heat :
https://brainly.com/question/1429452
#SPJ2.
What happens to the particles of an object when its temperature increases? *
The PE of the particles decreases.
The KE of the particles decreases.
The PE of the particles increases.
The KE of the particles increases.
Answer:KE
Explanation: