Answer:
Reactivity with other chemicals
Toxicity
Coordination number
Flammability
Enthalpy of formation
Heat of combustion
Oxidation states
Chemical stability
Explanation: just think of something that wont stay the same
Answer:
Flammability I believe. I'm not for sure tho.
a driver brings a car to a full stop in 2.0 s. if the car was initially traveling at 22 m/s, what is the acceleration?
Answer:-11m/s^2
Explanation:
What is the Morgan-Keenan Spectral Classification system?
A method of classifying stars by their temperatures and compositions.
A method of classifying stars by their distance from the Sun.
A method of classifying stars by their age.
A method of classifying stars by their age and distance from the Earth.
Answer: A method of classifying stars by their temperatures and compositions.
Explanation:
The Morgan-Keenan Spectral Classification system is a method of classifying stars by their temperatures and compositions.
What is Morgan-Keenan Spectral classification of star?The primary factor used to categories stars is their temperature.
The Morgan-Keenan luminosity class (MK or MKK) was developed as a result of the Harvard spectral classification classification scheme does not completely describe the star as it cannot distinguish between stars with the same temperature but different luminosities.
Since then, class I stars have been separated into Ia-O, Ia, and Ib, and classes VI (sub-dwarf), and D (white dwarf) have been added, replacing the original roman numerals between I (supergiant star) and V (main sequence).
The original Harvard classification of the star is supplemented by the MK luminosity class in order to fully define it. For instance, the entire classification of the Sun, which is a main sequence G2 star, is G2V.
The MK luminosity class is added to the Harvard classification of the star in order to fully define it.
A method of classifying stars by their temperatures and compositions is applied in Morgan-Keenan Spectral Classification system.
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When energy is transformed, some is used, but most is released as unusable heat energy, according to the law of thermodynamics.
ILL GIVE YOU BRANLEAST
Select the correct answer
Enca throws a terwis ball against a wall, and it bourses back. Which force is responsible for sending the ball back to Erica
Oh the force that the balleverts on the wall
OB, the frictional for between the wall and the ball
C, the acceleration of the ball as it approaches the wall
the normal force that the wall events on the ball
Reset
Ner
I believe it's C. The acceleration of the ball as it approaches the wall.
Answer:
the acceleration of the ball as it approaches the wall :))
Explanation:
hope this helps!
is 35 k/m a velocity?
Answer:
No
Explanation:
the unit of velocity is m/s and the velocity is written as 35m/s not 35 k/m
What’s wrong with this picture ? ..(a group of musicians having a concert on the moon in space
Answer:
Nobody can hear them play.
Explanation:
There is no sound in space.
What’s wrong with this picture is in space it is not possible to hear any sound.
Why is space completely silent?When these waves reach your ears, they are the particles that vibrate in your eardrum for you to hear. So if space is a big vacuum, there are no particles to create sound waves. Therefore, sound cannot propagate if we are floating through the cosmos.
In this way, the irony of the image is given by the musical concert between astronauts that nobody can hear them playing.
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What are formed by the outermost electrons
Answer:
Im sorry but i really need these points. FORGIVE ME
Explanation:
Answer:
Valence Electrons
Explanation:
The electrons of an atom that can participate in the formation of chemical bonds with other atoms. they are the furthest electrons from nucleus
which one is more important in science, qualitative or quantitative
Answer:
quantitative
Explanation: quantitative research is better for scientist.
Amanda selects a sample of college students. She obtains the students' scores on several personality scales, as well as on a test of creativity. Amanda wishes to summarize her sample's performance on the creativity test. She therefore uses _____ statistics to present raw data.
Answer:
descriptive
Explanation:
In this scenario, Amanda would use descriptive statistics in order to present the raw data. That is because, this type of statistic fulfills her goal of summarizing the raw data, while still providing clear and accurate quantitative analysis regarding the different features of the study through the different tests done. Including the personality scales and creativity test data. Since this provides such information it would best fit the goal of what Amanda is trying to accomplish.
A computer is on a desk. The normal force pushing up on the computer is 17 N and the weight is 17 N down. Find the net force.
When A computer is on a desk The normal force pushing up on the computer is 17 N and the weight is 17 N down then the Net force is 0 N
What is Balanced and Unbalance forces ?Motion of the object is because of Force exerted on it. Balanced forces are those forces which are opposite in direction and equal in magnitude. When resultant force acting on a body is zero then it is called as balanced force. motion of the body is not because of Balanced force. ex. when two persons pulling rope on both end with equal magnitude which cause them to be balanced force have 0 net force.
When resultant of all the forces is not equal to zero then we call it as Unbalanced forces. unbalanced force are responsible for the motion of the body.
Given,
Normal Force in upward direction = 17N
weight mg in downward direction = 17N
in this case both forces are in opposite direction. one is on positive y direction and other one is in negative y direction. Therefore net force acting on the computer desk is given by,
[tex]F^{2} _{net} = F^{2} _{1} + F^{2} _{2} + 2F _{1}F _{2}cos\alpha[/tex].....1
where [tex]\alpha[/tex] = angle between two forces.
[tex]\alpha[/tex] = 180 [tex]cos\alpha[/tex] = -1
[tex]F_{1} = F_{2}[/tex] , 17N =17N
With this equation 1 becomes
[tex]F^{2} _{net}[/tex] = 2F₁²-2F₁² = 0N
Hence net force is 0 N. This is a balanced force.
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Calculate the kinetic energy of a 1500 kg car moving at 42 km/hr.
PLEASE HELP IM UNSURE OF WHAT THE ANSWER IS
Answer:
The horizontal forces (Cols 2 & 3) balance for W and Y.
The vertical forces (Cols 1 & 4) also balance for W and Y.
This is not true for either X (unbalanced horizontal forces) or
Z (also unbalnced horizontal forces)
An object has positive velocity and negative acceleration, what does this mean?
(1 Point)
The object is accelerating backwards.
The object is backing up but slowing down.
The object is moving forward but slowing down.
The object has a constant velocity backing up.
Answer:
the object is moving forward but it is slowing down
Explanation:
negative acceleration becomes when the intiall velocity becomes greater than the final which means if it is initially greater but finally smaller that means it is slowing down but moving forward
hope it helps
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How long will it take to fall 50 m?
Answer:
down below
Explanation:
Since we aren't the given the time, lets say that an object to 25 seconds to fall 50 meters. We can use the formula [ s = d/t ] to solve.
s = 50/25
s = 2
Therefore, the object was falling at a rate of 2 meters per second.
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Physics , help please
HELP PLEASE ASAP
A can of tuna, starting from rest, is dropped off a building. If it is only being pulled down by gravity (-
9.8 m/s2) and it hits the ground 3.2s later, how far (Ax) did it drop?
Answer: (displacement/delta x) = -50. m, and distance dropped = 50. m (50. m below the starting location)
Explanation:
We know that the initial velocity of the tuna can is 0 m/s, as it is at rest. Also, we have the acceleration caused by gravity (-9.8 m/s^2). The time for the trip is 3.2 s. We need to find the displacement, or delta x.
To do this, we need to use a freefall equation. The one we can use with initial velocity, time, and acceleration would be the following:
d = (initial velocity)(time) + (1/2)(acceleration caused by gravity)(time)^2
d = (vi)(t) + 1/2(g)(t)^2
d = (0 m/s)(3.2 s) + 1/2(-9.8 m/s^2)(3.2 s)^2
d = 1/2(-9.8 m/s^2)(3.2 s)^2
d = -4.9(3.2)^2
d = -4.9(10.24)
d = -50.176 = -50. m
A car starts from rest and travels 25 m in 5 seconds at constant velocity. It then reverses 5 m in 10 seconds at constant velocity. The car then sits at rest for 5 seconds before it reverses at constant velocity back to where it started in 10 seconds time. Draw a position time graph that demonstrates the motion of the car.
Answer:
the car is going to same sped !
Explanation:
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hey can you plz help me
Leo makes an electrical circuit using a battery, copper connecting wires, and a
lamps.
1 Sketch the assembly and say if the lamp lights up.
2 Specify the direction of movement of the free electrons.
3 Leo reverses the connections to the battery terminals. In which directions do the
free electrons.
Answer:
I can't do the sketch
the direction of elections would move though the wires opposite direction
the 3rd one I'm not sure
when the body is moving with constant velocity it's acceleration is
Answer:
Zero
Explanation:
If a 60-g object has a volume of 30 cm", what is its density?
Answer:
Density = Mass/volume. D= 60/30.Divide it and you'll get ur answer as 2
Look at pic attached
Answer:
d=75 m
Explanation:
The horizontal launching speed is, v = 30 m/s
The vertical distance above the ground is= h m
The time of flight t= 2.5 s
The formula for free fall to apply here is:
h=1/2 *g * t² where g is acceleration due to gravity = -9.8 m/s² and t=2.5 s
Finding h, as ;
h= 1/2 * -9.8 * 2.5² = 30.63 m
Applying the formula for range (distance d)
R= v * t
R= 30 *2.5 =75 m
The range is 75 meters.
A sailfish swims 120 km/hr. How far will it travel in 8.0 minutes?
Answer:
16km
Explanation:
First change the minutes into hours then multiply by the distance.
(8÷60)×120=16km
7. Two bikes travelling in the same direction move at a speed of 30 km/hr. The bikes are separated by a distance of 5 km. What would the speed of the car travelling in the opposite direction be if it meets these bikes at an interval of 4 minutes?
Answer:
Explanation:
Call the bike on the right A
Call the bike on the left B
The car begins it's time when it passes A
4 minutes later, it passes B.
But B has moved in 4 minutes and that is the key to the problem.
How far has B moved.
t = 4 minutes = 4/60 hours = 1/15 of an hour.
d = ?
rate = 30 km / hr
d = r * t
d = 30 km/hr * 1/15 hours = 2 km
The distance between the bikes is 5 km.
So the car has traveled 5 - 2 = 3 km
d = 3 km
r = ?
t = 4 minutes = 1/15 hour
r = d/t = 3/(1/15)= 3 / 0.066666666 = 45 km/hr.
In a standard gas grill propane tank, there is approximately 4,579 mL of propane (C3H8). At a temperature of 55˚C, the tank has a pressure of 1,798 kPa. The tank is cooled to 25˚C and the pressure reduced to 1,025 kPa. What will the new volume be?
Answer:
7300 mL
Explanation:
The question is a bit misleading, since tanks generally have a constant volume. But anyway, using ideal gas law:
PV = nRT
If amount of gas (n) is constant, then:
PV / T = constant
P₁V₁ / T₁ = P₂V₂ / T₂
(1798 kPa) (4579 mL) / (55 + 273) K = (1025 kPa) V / (25 + 273) K
V = 7298 mL
Rounded to two significant figures, the volume is 7300 mL.
What does it mean to say that mass is conserved during a physical change?
Answer:
Alright, so mass is a property of a physical body. During physical changes, such as acceleration, force, etc, the mass stays the same since we are not affecting its physical shape, just where it is physics wise. So yeah mass is conserved during a physical change.
Explanation:
Hopefully this helped, if not HMU and I will get u a better answer
-have a great day! :)
In a physical change the mass remains the same before and after the process, then it is said as the mass is conserved and mass is only conserved in the isolated system.
What is the law of Conservation of Mass?A system that is isolated from its environment is one that does not communicate with it. As a result, no matter what changes or chemical reactions take place in that isolated system, the mass will remain constant; even if the final state may differ from the initial state, there can be no more or less mass than there was before the change or reaction.
The understanding that substances do not actually vanish as a result of a reaction, despite what might appear to be the case, but rather change into another material of equal mass, was made possible by the law of conservation of mass, which was essential to the development of chemistry.
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PLEASE HELPPP MEEEE!!!!!
Which of the following statments are true?
a
an object’s average velocity and average speed will not always be the same
b
If the object changes direction, then the distance traveled and the displacement will be different
c
If these two values are different, then speed and velocity will also differ.
d
none of the above
Answer:
A, B, C
Explanation:
everything in the universe is made up of what A.atoms B.minerals C.nitrogen
Answer: A) Atoms.
Explanation:
Answer:
a atoms
Explanation:
An apple is thrown across the cafeteria with a force of 10 N and at an acceleration of 6 m/s2. What is the mass of the apple? ... please answer asap
Answer:
Explanation:
F = m * a
The apple's acceleration is not influenced by the acceleration due to gravity for this question. In real life it most certainly is influenced by gravity.
F = m * a
F = 10 Newtons.
a = 6 m/s^2
m = 10/6 = 1.66 kg. Mighty large apple
A dog chasing a cat has 0.55 times the kinetic energy of the cat, which has 0.45 times the weight of the dog. The dog speeds up by 0.91 m/s and then has the same kinetic energy as the cat. What was the original difference in speed of the dog and cat? In other words, what is v_sub_cat - v_sub_dog initially (before the dog speeds up)?
Answer:
The difference in speed of the dog and cat is 2.65 m/s
Explanation:
Given that,
Mass of cat = 0.45 times the mass of dog
K.E of dog = 0.55 times K.E of cat
We need to calculate the velocity of dog
Using given data
[tex]\dfrac{1}{2}m_{d}v_{d}^2=0.55\times\dfrac{1}{2}m_{c}v_{c}^2[/tex]
[tex]m_{d}v_{d}^2=0.55\times0.45\times m_{d}\times v_{c}^2[/tex]
[tex]v_{d}^2=0.2475\times v_{c}^2[/tex]
[tex]v_{d}=0.497v_{c}[/tex]....(I)
The dog speeds up by 0.91 m/s and then has the same kinetic energy as the cat.
We need to calculate the velocity of dog
Using conservation of kinetic energy,
[tex]\dfrac{1}{2}m_{d}v_{d}^2=\dfrac{1}{2}m_{c}v_{c}^2[/tex]
[tex]\dfrac{1}{2}m_{d}(v_{d}+0.91)^2=\dfrac{1}{2}m_{c}v_{c}^2[/tex]
[tex]m_{d}(v_{d}+0.91)^2=0.45m_{d}v_{c}^2[/tex]
[tex]v_{d}+0.91=0.67v_{c}[/tex]
[tex]v_{d}=0.67v_{c}-0.91[/tex]...(II)
From equation (I) and (II)
[tex]0.497v_{c}=0.67v_{c}-0.91[/tex]
[tex]v_{c}=\dfrac{-0.91}{(0.497-0.67)}[/tex]
[tex]v_{c}=5.26\ m/s[/tex]
Put the value in equation (I)
[tex]v_{d}=0.497\times5.26[/tex]
[tex]v_{d}=2.61\ m/s[/tex]
We need to calculate the difference in speed of the dog and cat
Using speed of dog and cat
[tex]v_{c}-v_{d}=5.26-2.61[/tex]
[tex]v_{c}-v_{d}=2.65\ m/s[/tex]
Hence, The difference in speed of the dog and cat is 2.65 m/s
PLEASE HELP MEE 15 POINTS
the model represents a(n)
A. Compound
B. Mixture
C. Element
D. Electrons
The model represents a compound, therefore the correct answer is option A.
What is a Chemical compound?
A chemical compound is a combination of two or more either similar or dissimilar chemical elements.
For example, H₂O is a chemical compound made up of two oxygen atoms and a single hydrogen atom.
A single carbon atom is covalently joined to two oxygen atoms to form the chemical molecule known as carbon dioxide or CO2.
Animals exhale it, and plants use it in the process of photosynthesis. Under normal conditions of pressure and temperature, carbon dioxide, or CO2, is a gas.
Thus, the model represents a compound, therefore the correct answer is option A.
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