Answer:
Earth is made mostly of silicate rock in its crust and mantle, iron-nickel metal in the core. This is like some other planets -- but very unlike others.
So I have to write a motion story for physics. For the assignments you need to have:
• constant velocity
• speeding up while moving forward
• speeding up while moving backward
• object at rest
• slowing down while moving forward
That’s my story in the picture that I wrote, I just need a confirmation if the m/s and seconds are correct and the story itself is correct.
(I’ll try my best to give a brainliest if I find out how to)
Thank you!
Answer:
,
Explanation:
Answer:
Is
• speeding up while moving forward
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
for any question comment me ❤❤
when the body is moving with constant velocity it's acceleration is
Answer:
Zero
Explanation:
eventually sarah reaches the end trafic and is able to drive the speed limit again will this change her velocity
Answer:
yes
Explanation:
This will change cause of the increase in her speed.
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.
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:
I just now luv
Physics , help please
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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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 car accelerates uniformly in a straight line from rest at the rate of 3.7 m/s2
What is the speed of the car after it has traveled 63 m? Answer in units of m/s.
How long does it take the car to travel 63 m? Answer in units of s
Explanation:
Using equations of motion :
(A) we know that,
u = 0
a = 3.7 m/s^2
S = 63
[tex] {v}^{2} = {u}^{2} + 2as[/tex]
[tex]v = \sqrt{0 + 2 \times 3.7 \times 63} = 21.6 \: m{s}^{ - 1} [/tex]
(B)
v = u + at
21.6 = 0 + 3.7 * t
t (time to reach 63 m) = 5.83 seconds
What is the mass of the object being measured?
A triple beam balance is shown. The first slider is at the 70 gram mark. The second slider is at the 300 gram mark. The third slider is at the 5 gram mark.
Answer:
m = 375 [gram]
Explanation:
A triple Beam balance is an instrument very easy to use, since we only have to perform the arithmetic sum of each of the weights that are recorded in each beam
m = 300 + 70 + 5 = 375 [gram]
For a better understanding, the following image is attached, with values on each beam, which should be read.
The largest mass is in the indicator of 100 [gram], the second mass is in the indicator of 20 [gram] and the third is in the indicator of 5.8 [gram]. Thus the arithmetic sum corresponds to:
M= 100 + 20 + 5.8 = 125.8 [gram]
Note: it is important that when the instrument is in balance, the opposite end of the beam should indicate a position of zeros.
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:
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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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
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
state 3 types of forces that act between object that are not in contact
magnetic force
gravitational force
electrostatic force
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.
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
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.
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
A boat heads directly eastward across a pier at 12 meters per second. If the current in the river is flowing
at 5.0 meters per second due south, what is the magnitude of the boat's resultant velocity
Answer: 13 m/s
Explanation: The two vectors form a 5-12-13 right triangle. the magnitude of their resultant is the hypotenuse, which is 13 m/s.
The magnitude of the boat's resultant velocity (V) is 13 meters per second.
The velocity (v₁) of the boat heading in the eastward direction is in +ve (x-direction).
The velocity (v₂) of the current flowing in the south direction is in -ve (y-direction).
The magnitude of the boat's resultant velocity (V) can be determined by using the Pythagoras' rule:
∴
V² = V₁² + V₂²
V² = (12 m/s)² + (-5.0 m/s)²
[tex]\mathbf{V = \sqrt{(12 m/s)^2 + (-5.0 m/s)^2}}[/tex]
[tex]\mathbf{V = \sqrt{(144 m/s) + (25m/s)}}[/tex]
[tex]\mathbf{V = \sqrt{(169 \ m/s) )}}[/tex]
V = 13 m/s
Therefore, we can conclude that the magnitude of the boat's resultant velocity (V) is 13 meters per second.
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PLZZ ANSWER THE QUESTION
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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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
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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everything in the universe is made up of what A.atoms B.minerals C.nitrogen
Answer: A) Atoms.
Explanation:
Answer:
a atoms
Explanation:
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!
what are two benefits of scientists using a diagram to model the water cycle A It can Show changes that Occur in many Diffrent parts of Earth at The Same Time . B It can Be Used to Show How the parts of the cycle relate to One Another. C Only a Few Factors In The Water Cycle can be shown on the Diagram .D It can be used to show as much detail as is Present in The actual Water Cycle.
Answer:
right ones are. It can show changes that occur in many different parts of the Earth at the same time, and It can be used to show how the parts of the cycle relate to one another.
Explanation:
I just did it on Apex, hope this helps!!
The two main benefits which the scientists have using a diagram to model the water cycle are it can show changes that occur in many different parts of the Earth at the same time and it can also be used to show how the parts of the cycle relate to one another. Thus, the correct options are A and B.
What is the Water cycle?The water cycle is a type of biogeochemical cycle which shows the continuous movement of the water molecule in different states within the Earth and the atmosphere.
Water cycle is a complex system which includes many different processes. This includes the liquid water which evaporates into the form of water vapor in the atmosphere, the vapor undergoes condensation to form clouds, and these clouds precipitate back to the earth in the form of rain and snow.
The benefits of using a diagram to model the water cycle includes showing all the changes that occur in many different parts of the Earth at the same time and it can also be used to show how the parts of the cycle relate to one another.
Therefore, the correct options are A and B.
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which one is more important in science, qualitative or quantitative
Answer:
quantitative
Explanation: quantitative research is better for scientist.
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:
