The time that takes for the train that is traveling with an initial velocity of 20.1 m/s to stop is 402 seconds.
The time that will take for the train to stop can be calculated with the following kinematic equation:
[tex] v_{f} = v_{i} + at [/tex] (1)
Where:
[tex] v_{f}[/tex]: is the final velocity = 0 (when it stops)
[tex] v_{i}[/tex]: is the intial velocity = 20.1 m/s
a: is the acceleration = -0.0500 m/s²
t: is the time =?
By solving equation (1) for t, we have:
[tex] t = \frac{v_{f} - v_{i}}{a} = \frac{0 - 20.1 m/s}{-0.0500 m/s^{2}} = 402 s [/tex]
Therefore, it will take 402 seconds for the train to stop.
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In a molecule of lithium sulfide, there are two atoms of lithium and one atom of sulfur. Which statement about lithium sulfide is correct?(1 point)
The atoms in lithium sulfide are held together by bonds.
A molecular model of lithium sulfide would have two spheres.
The chemical formula for lithium sulfide is LiS2.
Both lithium and sulfur form positive ions.
Lithium sulfide is a compound and the atoms are held together by bonds.
What is a compound?Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.
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what is density?And It's SI unit.
Answer:
Density is defined as mass per unit volume. Hence its SI unit is: kg/m3
Explanation:
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What is the weight of a car that has a mass of 1250000 g
[tex]\\ \rm\hookrightarrow 1250000g=1250kg[/tex]
Mass=1250kgAcceleration=10m/s^2[tex]\\ \rm\hookrightarrow Force=Mass(Acceleration)[/tex]
[tex]\\ \rm\hookrightarrow Force=1250(10)[/tex]
[tex]\\ \rm\hookrightarrow Force=12500N[/tex]
The weight of the car that has a mass of 1250000 g would be 12262.5 N
What is Newton's second law?Newton's Second Law states that The resultant force acting on an object is proportional to the rate of change of momentum.The mathematical expression for Newton's second law is as follows
F = m*a
where F represents the force applied
m is the mass of the object and a is the acceleration of the object .
The major difference between the mass and the weight of an object is that mass of the object is constant throughout the universe while the way it can vary from the positional situation of the object in the universe for example the weight of the weight of the object in the earth would be different than the weight of the same object in some other planet for example The weight of an object on the Mars would be different than earth.
The weight of any object use the multiplication of the mass and the gravity of the respective planet in our case the weight is measured with respect to the gravity of the earth
Weight = Mass*(acceleration due to gravity)
W= m*g
The value of g for the earth is 9.81 m/s²
As per the given problem the car that has a mass of 1250000 g
1000 g = 1 kg
1250000 = 1250 kg
Weight = 1250*9.81
=12262.5 N
Thus ,the weight of the car that has a mass of 1250000 g would be 12262.5 N
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Two forces P and Q acting at a point at an angle have their resultant
(2n + 1)√P2 + Q2 and when at an angle (90° - ),the resultant is(2n - 1)√P2 + Q2.
Show that tan = (n - 1)/( n + 1).
Answer:
Answer is given in this paper.
Thank You
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ram takes 2 minutes to cover a distance of 600 meter. calculate his speed
A space station worker found herself floating free 100 meters from the space station because her safety line became unhooked
Answer:
Explanation: is that suppose to be the question or are you just saying?
ОООО
A dog runs from his home & goes 400 m around the block before reaching back home. What is the dog's total distance & displacement?
Distance: 0 m & displacement: 400m
Distance: 400 m & displacement:0m
Distance: Om & displacement:4 m
Distance: 4 m & displacement: Om
Answer:
A dog runs from his home & goes 400 m around the block before reaching back home. What is the dog's total distance & displacement?
Distance: 400 m & displacement:0m
Explanation:
Option B is the answer.
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Prove that the acceleration due to gravity is independent to the mass of the falling body.
Answer:
½mv²=mgh
g=½(V²/h)
Explanation:
When an object is held at a height, it posses gravitational potential energy which is mgh, where m= mass, h=height, g=acceleration due gravity
When the object is dropped, the potential energy will be converted to kinetic energy which is ½mv², where V=velocity at which the object moves.
V=∆h/t, ∆h is change in height with respect to time.
½mv²=mgh
Mass cancel out,
g=v²/2h
This implies that g does not depend or is not affected by mass. Hence heavy object and light object will reach the ground at the same time when dropped from the same height. When air resistance is negligible.
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Explain how can a ripple tank be used to view wave pattern.
Answer:
when you push up and down the pencil right in the middle of the water tank. it will produce ripples. If seen at the perfect angle you will observe the waves
Explanation:
What type of evidence is needed for a hypothesis to be supported or not supported?
O demonstrative evidence
O observational evidence
O physical evidence
O circumstantial evidence
Answer:
Answer in Observational evidence (b)
The evidence needed to formulate a hypothesis is observational evidence. From keen observations, we are formulating a scientific hypothesis.
What is hypothesis ?Hypothesis is a plausible scientific statement which predicts a process or result of an experiment based on observations. Hypothesis can be made from well established scientific records also.
Some are formulating hypothesis based on some intuitions, while some others are formulated based on inductions or deductions. An experiment starts from a clear cut hypothesis.
A hypothesis must be testable, falsifiable. A scientific hypothesis must be based on a strict observation and for a considerable time and the observations must support for the statement derived for the solution.
Hence, the evidence is needed for a or a hypothesis to be supported or not supported is observational evidence.
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A 2.80 kg mass is dropped from a
height of 4.50 m. Find its kinetic
energy (KE) when it is 3.00 m
above the ground.
Answer:
41.16J
Explanation:
m =2.8 kg
h1 = 4.5 m
h2 = 3 m
PE at top = mgh1= 4.5mg
PE at 3 m = mgh2= 3mg
energy is conserved los in PE = gain in KE
KE at 3 m above the ground
= mg(4.5 - 3) J
= 2.8 kg*9.8m/s^2*1.5 m
= 41.16 joules
Answer: 42 m/s
Explanation:
m=2.8 kg , V1=0 m/s , h1=4.5 m , h2=3 m , V2=? m/s
E1 = E2 >>> K1 + U1 = K2 + U2
Kinetic Energy (KE) = K = [tex]\frac{1}{2}[/tex] m [tex]V^{2}[/tex] Potential Energy (PE) = U = mgh
[tex]\frac{1}{2}[/tex] m [tex]V1^{2}[/tex] + mg[tex]h_{1}[/tex] = K2 + mg[tex]h_{2}[/tex] >>> V1=0 >> K1=0 >>> K2 = -mgΔh
K2 = 2.8 kg × 10 m/s2 × 1.5 m = 42 m/s
what is molecular formula give short answer
Explanation:
molecular formula consists of the chemical symbols for the constituent elements followed by numeric subscripts describing the number of atoms of each element present in the molecule. The empirical formula represents the simplest whole-integer ratio of atoms in a compound.
Answer:
The symbollic representation of a molecule of an element or a compound present in a molecule is called molecular formula.
For example: molecular formula of sodium chloride is NaCl.
The airplane refuels between City A and continues on to City B. It travels at an average speed of 733.9 km/h. If the trip takes 2.4 hours, what is the flight distance between City A and City B? Answer in km
Answer:
733.9× 2.4
1761.36
Explanation:
The airplane refuels between city A and continues on to city B. It travels at an average speed of 733.9km/h. If the trip takes 2.4 hours, what is the flight distance between city A and city B?
A force of 10N makes an angle of 30 degree with y-axis. The magnitude of X component will be?
tides occurs in oceans but not in lakes.why?
Answer:
Explanation:
Tides occur in the ocean but nit in lakes because an ocean is a free flowing body of water that can travel a large area of the globe while a lake or pond only covers a small area of the earth so it is not affected by gravity as violently and in turn, prevents the formation of tides.
A charge feels a 7.89 x 10-7 N force when it moves 2090 m/s at a 29.4° angle to a 4.23 x 10-3 T magnetic field. What is the amount of the charge?
We have that the amount of the charge q is
[tex]q=1.8*10^{-7}[/tex]
From the Question we are told that
Force [tex]F=7.89 x*10^{-7}[/tex]
Velocity [tex]V=2090m/s[/tex]
Angle [tex]\theta=29.4[/tex]
Magnetic field [tex]B=4.23 * 10^{-3} T[/tex]
Generally, the equation for Force F is mathematically given by
[tex]F=qVBsin\theta\\\\q=\frac{F}{VBsin\theta}[/tex]
[tex]q=\frac{7.89 x*10^{-7}}{4.23 * 10^{-3} T*sin29.4*2090m/s}[/tex]
[tex]q=1.8*10^{-7}[/tex]
In conclusion
The amount of the charge q is
[tex]q=1.8*10^{-7}[/tex]
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From the question, the given charge moving within the magnetic field would have a value of 1.82 x [tex]10^{-7}[/tex] C.
A charge is either a positively or negatively charged particle. When a charge is moving through a magnetic field, it would experience a force which depends on the amount of the charge, its speed, the magnetic field strength and angle. The force on a charge in a magnetic field can be determined by:
F = qvBSin θ
where: q is the charge, v is its velocity/ speed in the field and θ is the angle of deflection of the charge.
Given that: F = 7.89 x [tex]10^{-7}[/tex] N, v = 2090 m/s, B = 4.23 x [tex]10^{-3}[/tex] T and θ = 29.4°.
Thus, the amount of the charge can be determined by;
q = [tex]\frac{F}{vBsin O}[/tex]
= [tex]\frac{7.89*10^{-7} }{2090*4.23*10^{-3}* Sin 29.4 }[/tex]
= [tex]\frac{7.89*10^{-7} }{4.340}[/tex]
q = 1.818 x [tex]10^{-7}[/tex]
q = 1.82 x [tex]10^{-7}[/tex] C
Therefore, the amount of the charge that moved within the magnetic field is 1.82 x [tex]10^{-7}[/tex] C.
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A parachute is driven toward east direction with a speed of 20ms-1. A ball is thrown out with the speed of 4ms-1. What wil be the speed of the ball after it has been thrown out of parachute.
We have that the ball after it has been thrown out of parachute is
[tex]V_t=24ms^{-1}[/tex]
From the Question we are told
Parachute Speed [tex]v= 20ms^-1[/tex]
Ball Speed [tex]v= 4ms^{-1}[/tex]
Generally the equation for the resultant speed of the ball is mathematically given as
[tex]V_t=V_1+v_2\\\\v_t=20+4[/tex]
[tex]V_t=24ms^{-1}[/tex]
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principle of simple Machine
Answer:
Effort×Effort distance = load× load distance
Answer:
Renaissance scientist
Two astronomers are viewing temperature data from each of the sun's layers, but the layers aren't identified. Describe one way the scientists can use temperature to identify which layer they are studying.(1 point) The highest temperatures are from the corona. The highest temperatures are from the corona. The lowest temperatures are from the photosphere. The lowest temperatures are from the photosphere. The lowest temperatures are from the core. The lowest temperatures are from the core. The highest temperatures are from the radiative zone.
Here we can study the different temperatures of each one of the layers of the sun.
We will find that the way that the scientist can identify which layer are they studying is "The lowest temperatures are from the photosphere."
A brief description of the temperature of each layer is:
Center of the sun: about 15 million K
Radiative Zone: Goes from 7 million K to 2 million K.
Convection Zone: goes from 2 million K to 5800K
Photosphere: Is in average 5800 K , but there are sunspots with lower temperatures, of around 3800 K.
Chromosphere: goes from 4300 K to 8300 K
Corona: Around 2 million K.
So now we can analyze each of the options to see which ones make sense.
A) The highest temperatures are from the corona.
This is false, we can see that in the center and in the radiative zone we have larger temperatures than in the corona.
B) The lowest temperatures are from the photosphere.
While on average the temperature of the photosphere is larger than the smaller temperature of the chromosphere, in the photosphere we have the sunspots, and there we have the smallest temperatures in the whole sun, so this is true.
C) The lowest temperatures are from the core (or center).
Clearly false, there we have the larger temperatures.
D) The highest temperatures are from the radiative zone.
Again false, the larger temperatures are in the center.
So the only true option is "The lowest temperatures are from the photosphere."
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Answer:
The lowest temperatures are from the photosphere
Explanation:
I just took this quick check on connexus
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2. What is an example of a question that cannot be solved using science?
Answer:
How did life begin on earth?
Explanation:
this is an example of a question that cannot be solved or why do we sleep too cannot be solved
Answer:
How did life on earth originate?
Explanation:
While there are many views on how life on earth started, especially from a religious stand point, scientists think this idea is "irrational". This is probably because it doesn't make sense how a higher power could create everything that we see on earth today from nothing. While they have tried to create simulations on how life could have possibly formed, they have gotten no answer.
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In which group of elements does tellurium (Te) belong?
(1 point)
alkali metals
metalloids
lanthanides
transition metals
Answer:
metalloids
Explanation:
Periodic Table
A Periodic table is an arrangement of chemical elements in order of increasing atomic number.
Metalloids: Metalloids have properties that are midway between metals and non metals
Tellurium is a chemical element with symbol Te and atomic number 52. Classified as a metalloid, tellurium is a solid at room temperature.
Properties
Atomic Mass
127.6u
Oxidation States
+6, +4, -2
Year Discovered
1782
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Which structure defines the sulfhydryl functional group?(1 point)
SOH
OH
SH
SH2
Answer:
the correct answer is
"SH"
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The sulfhydryl functional group is shown by -SH.
The sulfhydryl functional group is known by several other names such as; thiol, mercapto or sulfanyl.
The sulfhydryl functional group has the structure -SH. The sulphur atom bears two lone pairs which is also important in studying the chemistry of this functional group.
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0.054x2.33x90............
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What's Centripetal force................
Answer:
a force that acts on a body moving in a circular path and is directed towards the centre around which the body is moving.
Answer:
A centripetal force is a force that makes a body follow a curved path. Its direction is always orthogonal to the motion of the body and towards the fixed point of the instantaneous center of curvature of the path.
¿Qué ocurre como consecuencia de las corrientes de convección en la astenosfera?
Respuesta:En la astenosfera existen lentos movimientos de convección que explican la deriva continental. Además, el basalto de la astenosfera fluye por extrusión a lo largo de las dorsales oceánicas, lo cual hace que se renueve y expanda constantemente el fondo oceánico. :D
A girl walks 150 m from home to school in an easterly direction. She then turns and walks away 25 m to a shop what distance did the girl walk?
Answer:
175 miles
Explanation:
because when the girl walked from point A to B which is 150 miles and walks away 25 miles to a shop.
what is momentum?????
Answer:
[tex]momentum \: is \: the \: force \: or \: speed \: of \: the \: movement \\ equation \\ momentum = mass \times change \: in \: velocity \\ thank \: you[/tex]
On his fishing trip Justin takes the boat 12 km south. The fish aren't biting so he goes 4 km North. He follows a school of fish 1 km further north.
What distance did he cover? What was his displacement?
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Answer:
Distance: 17 km
Displacement: 7 km
Explanation:
The distance is the total measure of how much he moved.
The displacement is the straight line between the star point and the end point
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Explain how magnetic potential energy can be transformed into kinetic energy.
Potential energy converts kinetic energy when the range is shifting from the S pole to the N pole.
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