What horizontal force p must a worker exert on the rope to position the 50-kg crate directly over the trailer?
Answers
The horizontal force p must a worker, new tension is P= 122.62 N
The tension in the rope is
\(T_{1}=W_{create} g\)
T1=50×9.81
T1=490.5 N
And the rope is in vertical position
When a worker exert a horizontal force P on the rope, new tension is
\(T_{2} =\sqrt{T1^{2} +P^{2} }\)
\(T_{2} =\sqrt{490.5}^{2}+P^{2}\)
Since T1 is vertical component to the tension T2
\(T_{1} =T_{2} cos \alpha\)
\(490.5^{2} /cos^{2} 14.036=490.5^{2} +P^{2}\)
\(P^{2} =490.5^{2} /cos^{2} 14.036 - 490.5^{2}\)
P= 122.62 N
What is horizontal reaction force?As long as no horizontal applied forces are present, the horizontal response force is zero. A single-support cantilever beam has a response force and reaction moment. The total applied forces on the beam are equal to the reaction force.
When the compression pressures are removed, the distortion may either be permanent or reversible. In the latter scenario, the deformation creates reaction forces that compete with the compression forces and may ultimately bring them into balance.
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Related Questions
with what constant velocity would you have to push or pull the rod in order to make the magnetic force zero
Answers
Energy and Power Due to Motional Electromotive Force. Emf may be prompted in primary ways: Due to the movement of a conductor withinside the presence of a magnetic field. Due to the extrude withinside the magnetic flux enclosed via way of means of the circuit.
The length of the voltage may be various through 3 factors: The length of the magnetic discipline. The greater flux strains there are, the greater flux strains there are for the conductor to cut.
The lively period of the conductor. The velocity at which the conductor passes thru the discipline. Moving the bar to the proper decreases the vicinity of the loop, reducing the flux.
The caused modern need to generate a discipline out of the page. This calls for a counter-clockwise modern. The flux thru the loop is converting, so the loop attempts to oppose the alternate. The flux is converting due to the fact the bar is moving, converting the place of the loop. To oppose the alternate the loop makes the bar gradual down.
Thus the velocity (and the brought on emf and current) lower exponentially to zero.
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Why do you think that this type of fossil is called a print fossil?
Answers
Answer:
Fossils are the remains of plants, animals, fungi, bacteria, and single-celled living things that have been replaced by rock material or impressions of organisms preserved in rock.
Answer ☝ on pic that is non print fossil of dinousor
Answer ☝ on the pic is print fossil of turtle
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what's the relationship between magnetism and birds?
Answers
Answer:
can detect axis of magnetic field
Explanation:
Answer:
Birds can see the Earth’s magnetic fields. They just found out that this ability is the result of a special protein in the birds’ eyes.
Explanation:
Calculate the time t for the pencil to hit the ground, assuming that it falls from standing perfectly vertical and maintains this angular acceleration.
Answers
The angular acceleration when the pencil is 10° from the vertical is 17 rad/s². The time for the pencil to hit the ground is 0.43 s.
Look at the attachment for the complete question. The weight of the pencil is in the middle of it. When the pencil has an angle of 10.0° from the vertical
The force that applies is the weight force.F = w = mg
g = the acceleration due to gravity = 9.8 m/s²The position of weight force is r in the picture.
The weight force make a torque.Look at the triangle
sin 10° = r ÷ 0.5L
r = 0.5L sin 10°Moment of inertia for the pencil
I = (1/3) mL²
m = mass of the pencil = 10.0 gr = 0.010 kg
L = the length of the pencil = 15 cm = 0.150 mAccording to Newton's second angular law
∑τ = Iα
Fr = Iα
mg 0.5L sin 10° = (1/3) mL²α
3g × 0.5 × sin 10° = Lα
1.5 × 9.8 × 0.174 = 0.150 α
α = 2.553 ÷ 0.150
α = 17 rad/s²
When the pencil hit the ground
The angle from verticalθ = 90° = π/2 radians = 3.14 ÷ 2 = 1.57 radThe pencil moves in non-uniform circular motion The pencil's initial stop, ω₀ = 0
θ = ω₀ t + 0.5 αt²
θ = 0.5 αt²
2θ = αt²
2 × 1.57 = 17t²
t² = 3.14 ÷ 17
t² = 0.1847
\(t \:=\: \sqrt{0.1847}\)
t = 0.43 s
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is flammability a physical property or chemical property
Answers
Answer:
Chemical property
Explanation:
Science go brrrrrrrrr
A block is attached to the end of a horizontal ideal spring and rests on a frictionless surface. The block is pulled so that the spring stretches relative to its unstrained length. In each of the following three cases, the spring is stretched initially by the same amount. Rank the amplitudes of the resulting simple harmonic motion in decreasing order (largest first). (a) The block is released from rest. (b) The block is given an initial speed . (c) The block is given an initial speed .
Answers
Answer:
The answer is "a, c and b"
Explanation:
Its total block power is equal to the amount of potential energy and kinetic energy.Because the original block expansion in all situations will be the same, its potential power in all cases is the same.Because the block in the first case has no initial speed, the block has zero film energy.For both the second example, it also has the \(v_o\) velocity, but the kinetic energy is higher among the three because its potential and kinetic energy are higher.While over the last case the kinetic speed is greater and lower than in the first case, the total energy is also higher than the first lower than that of the second.The greater the amplitude was its greater the total energy, therefore lower the second, during the first case the higher the amplitude.(I) A centrifuge accelerates uniformly from rest to 15,000 rpm in 240 s. Through how many revolutions did it turn in this time
Answers
Answer:
θ = ω0 t + 1/2 ω t^2 = 1/2 α t^2 since it starts from rest
α = (15000 / 60) / 240 = 250 / 240 = 1.04 rev/sec^2
Note that α is in rev/sec^2
T(otal) = 1/2 * 1.04 * 240^2 = 30,000 revolutions
Check:
Average RPM = (15000/2) = 7500 rev/min = 125 / sec
125 / sec * 240 sec = 30,000 rev
our atmosphere is transparent to solar radiation, but it traps the energy that causes the greenhouse effect. why? view available hint(s)for part a our atmosphere is transparent to solar radiation, but it traps the energy that causes the greenhouse effect. why? because the solar energy absorbed by earth is reradiated as higher-frequency radiation because the solar energy absorbed by earth is reradiated as longer-wavelength radiation because the solar energy absorbed by earth is reradiated and doesn't reach the atmosphere because the solar energy absorbed by earth is reradiated as larger-intensity radiation
Answers
Our atmosphere is transparent to solar radiation, but it traps the energy that causes the greenhouse effect because the solar energy absorbed by Earth is reradiated as longer-wavelength radiation.
How is the atmosphere transparent to solar radiation?The atmosphere is transparent to incoming solar radiation, which is mostly visible light and short-wavelength radiation. However, the Earth absorbs some of this solar radiation and heats up.
The Earth then radiates this heat energy back out to space as longer-wavelength radiation, mostly in the form of infrared radiation. The greenhouse gases in the atmosphere, such as carbon dioxide and water vapor, are able to absorb this longer-wavelength radiation and trap some of the heat energy in the atmosphere, causing the greenhouse effect.
Hence, this is why the atmosphere is transparent to solar radiation but traps the energy that causes the greenhouse effect.
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a circuit is connected to 8 volt battery and it has 2 amperes of current flowing through the wires.What is the resistance of the circuit
Answers
Answer:
4 ohms
Explanation:
Current = Voltage/resistance
2 = 8/R
2R = 8
R = 4
Explain, step by step, how an electrical current is generated in the electrocytes.
Answers
Answer:
Hello your question is quite Vague hence I will provide you with a general knowledge answer
answer :
Place an electrode in an electrolyte solutionApply a voltage source ( Dc voltage )Movement of ions from the cathode to the anode of the electrode will begin The movement of ions brings about Electrical currentExplanation:
Electricity is generated in electrolytes through the following steps :
Place an electrode in an electrolyte solutionApply a voltage source ( Dc voltage )Movement of ions from the cathode to the anode of the electrode will begin The movement of ions brings about Electrical currentIons are electrically charged atoms that are either positive or negative ( i.e. lost or gained an electron )
Bert is traveling in a rocket that Ernie observes (from Earth) is moving at 4/5 the speed of light. Bert throws a rubber duckie forwards out of the rocket that he observes to fly at 4/5 the speed of light. How fast does Ernie measure the rubber duckie to be traveling
Answers
In the given scenario, Bert is traveling in a rocket, and Ernie is observing it from Earth. Ernie measures that Bert is moving at a speed of 4/5th of light. Bert throws a rubber duckie forward out of the rocket. From Bert's frame of reference, he observes that the rubber duckie is flying at a speed of 4/5th of the speed of light.
In this situation, Ernie will measure the rubber duckie to be traveling at a speed less than the speed of light. Ernie will measure the speed of the rubber duckie relative to his own frame of reference, and the resulting speed will be less than the speed of light. This is because of the phenomenon of time dilation and length contraction, which occur at relativistic speeds.Therefore, Ernie will measure the rubber duckie to be traveling at a speed less than 4/5th of the speed of light.
The exact value of the speed can be calculated using the formula of relativistic velocity transformation. However, the value of the speed of the rubber duckie relative to Ernie's frame of reference can be concluded to be less than the speed of light.
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Which element would Element X most likely be grouped with on the periodic table?
Answers
Answer:
group 0
Explanation:
it might be xenon (Xe)
According to the electronic configuration, and assuming the element to be halogen it is most likely to be grouped with potassium as halogens are in need of one electron which is easily made available by potassium.
What is electronic configuration ?Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
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what happens when a charged insulator is placed near an uncharged metallic object? they exert no electrostatic force on each other. they repel each other. they may attract or repel each other, depending on whether the charge on the insulator is positive or negative. the charged insulator always spontaneously discharges. they attract each other.
Answers
A metallic item becomes polarised when a charged insulator is brought close to it, as a result of the free charges in the metal moving about. The centre of charge for the type of charge opposite to that on the insulator will be positioned within the metallic item closer to the charged insulator .
What happens if a charged insulator comes into contact with a conductor?When a negatively charged insulator is in contact with a positively charged conductor, the extra negatively charged electrons will migrate to the conductor until they would prefer not to move at all. We refer to this as the system having attained equilibrium when it occurs.
When an uncharged metal item and a charged insulator are positioned close to one another, the charged insulator will induce the opposite charge, and the two objects will be drawn to one another.
The insulator and a metallic item are therefore attracted to one another by the net electric force.
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Question 21 of 25
Calculate the capacitance of a system that stores 6.5 x 10-10 C of charge at
Q
50.0 V. Use C =
AV
A. 7.7 * 1010 F
B. 3.1 x 107 F
C. 1.3 x 10-11 F
D. 3.2 x 10-8 F
SUBMIT
Answers
Answer:
C. 1.3 x 10-11 F
I took the test and got this correct, hope this helps
Explanation:
A particle in uniform circular motion requires a net force acting in what direction? A. Towards the center of the circle. B. In the direction of velocity. C. Opposite the direction of the velocity. D. Away from the center of the circle. E. Upward. F. Downward
Answers
A particle in uniform circular motion requires a net force acting towards the center of the circle. So option A is correct.
The net force acting on a particle moving in a circular path is always directed towards the center of the circle. The motion of a particle in a circular path is characterized by the direction of its velocity and acceleration at each instant in time. These two vectors are always perpendicular to each other.The magnitude of the net force required to keep a particle in uniform circular motion depends on the mass of the particle and its velocity, as well as the radius of the circular path it is following. This force is referred to as the centripetal force and is always directed towards the center of the circle.The centripetal force is provided by some other object, such as a string or a gravitational field, which acts to pull the particle towards the center of the circle. Without this force, the particle would continue to move in a straight line tangent to the circle, rather than in a circular path.Therefore option A is correct.
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Use the same line to answer the questions
Q1. Use the number line above to calculate the distances and displacements for the paths listed. Don't forget to include the units.
Distance Displacement
From A to B to M to N
From C to A to G to D
From J to I to E to H
From F to B to K to F
Q2. For each of the paths from Q1, calculate the average speed and the average velocity if the path is traveled in 5.0 seconds. Don't forget to include the units. Use this Formula Reference Sheet (click this highlighted link for information) to remember the formulas you need.
Average velocity Average speed
From A to B to M to N
From C to A to G to D
From J to I to E to H
From F to B to K to F
Answers
(a) The distance From A to B to M to N is 22 m, the displacement is 22 m, the speed is 4.4 m/s and the average velocity is 4.4 m/s.
(b) The distance From C to A to G to D is 24 m, the displacement is 2 m, the speed is 4.8 m/s and the average velocity is 0.4 m/s.
(c) The distance From J to I to E to H is 16 m, the displacement is -2 m, the speed is 3.2 m/s and the average velocity is -0.4 m/s.
(d) The distance From F to B to K to F is 32 m, the displacement is 0 m, the speed is 6.4 m/s and the average velocity is 0 m/s.
Distance traveled by the objectThe distance traveled by the object is calculated as follows;
Distance From A to B to M to N
From A to B to M to N = 3 + 18 + 1 = 22
Distance From C to A to G to D
= 5 + 13 + 6
= 24
Distance From J to I to E to H
= 1 + 8 + 7
= 16
Distance from F to B to K to F
= 8 + 16 + 8
= 32
Displacement of the objectThe displacement of the object is calculated as follows;
displacement = final position - initial position
Displacement From A to B to M to N
= 11 - (-11)
= 22
Displacement from C to A to G to D
= D - C
= - 4 - (-6)
= 2
Displacement from J to I to E to H
= H - J
= 5 - 7
= - 2
Displacement From F to B to K to F
= F - F
= 0
Speed of the objectThe speed of the object is calculated as follows;
speed = total distance/total time
Speed of the object from A to B to M to N
= 22/5 = 4.4 m/s
Speed of the object from C to A to G to D
= 24/5
= 4.8 m/s
Speed of the object from J to I to E to H
= 16/5
= 3.2 m/s
Speed of the object from F to B to K to F
= 32/5
= 6.4 m/s
Average velocity of the objectThe average velocity of the object is calculated as follows;
Average velocity from A to B to M to N
= 22/5
= 4.4 m/s
Average velocity of the object from C to A to G to D
= 2/5
= 0.4 m/s
Average velocity of the object from J to I to E to H
= -2/5
= -0.4 m/s
Average velocity of the object from F to B to K to F
= 0
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Calculate the volume of this regular solid.
A cone 4.5 centimeters high with a radius of 3 centimeters. Label B is pointing to the circular base of the cone.
What is the volume of the cone?
Use the button on your calculator to complete this problem.
Round at the end to the nearest hundredth.
Answers
Answer:
42.41
Explanation:
Hich type of electromagnetic waves are dangerous enough to be used to kill cancerous cells? gamma rays visible light infrared light microwaves
Answers
Answer:
gamma rays
Explanation:
Electromagnetic waves is a propagating medium used in all communications device to transmit data (messages) from the device of the sender to the device of the receiver.
Gamma rays is a type of electromagnetic waves that are dangerous enough to be used to kill cancerous cells.
In the electromagnetic spectrum, gamma rays are known to have the greatest amount of energy and shortest wavelength among the wave particles. They are generally produced through the disintegration of radioactive elements.
Answer:
A. Gamma rays
Explanation:
Proof:
Im so nervous about something and I need advice!!! PPPLLLLZZZZ DO NOT REPORT!! WILL MARK BRAINLIEST!!!
Answers
Answer: depends on what your nervous about
Explanation:tell me what your nervous about
Find the average distance (in the Earth's frame of reference) covered by the muons if their speed relative to Earth is 0. 845 c. Note: the rest lifetime of a muon is 2. 2 10's Consider muons traveling toward Earth from their point of creation at a height of 5. 00 km. Express your answer to three significant figures
Answers
The average distance travelled by the muons is 5.50 km in the Earth's frame of reference.
Muon is a subatomic particle that is a fundamental constituent of matter. It is classified as a lepton, along with the electron, tau, and three neutrinos. A muon's rest mass is 105.65837 MeV/c², which is around 207 times greater than the electron's rest mass. A muon's rest lifetime is 2.2 microseconds.
Find the average distance covered by the muons if their speed relative to Earth is 0.845c. The muon's lifetime can be used to determine the average distance it travels if its speed is constant over that time. The distance can be calculated using the following formula:
Distance = Speed × Time
A muon's lifetime of 2.2 microseconds and a relative velocity of 0.845c are given. We can use the above formula to determine the average distance covered by a muon in this situation.
Distance = Speed × Time= 0.845c × 2.2 µs= 4.97 × 10⁻⁴ km or 497 meters.
Since the muons are travelling towards Earth from a height of 5.00 km, we can add the height of their point of creation to the distance they travelled to determine the average distance they travelled from creation to the Earth's surface.
Average distance travelled by muon = Distance + Height= 497 m + 5.00 km= 5.50 km (to 3 significant figures).
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ethe earth takes 1 day to rotate once about its axis. what is the angular v elocity of a point on the surface of the earth studentroom physics ocr a
Answers
The angular velocity of a point on the surface of the earth is \(7.3 * 10^{-5} rad/s\)
What is angular velocity?
Angular velocity is a vector quantity and is described as the rate of change of angular displacement which specifies the angular speed or rotational speed of an object and the axis about which the object is rotating.
What is angular velocity and write its formula?
Angular velocity is the rate of change of the position angle of an object with respect to time, so w = theta / t, where w = angular velocity, theta = position angle, and t = time.
Every point on the earth's surface completes one circular orbit (centered at a point on the axis) in 1 day
1 day = 24x60x60
1 day=86400s
Angular velocity is given by :
\(w =2\pi /86400\\ w =7.3*10^{-5} rad/s\)
Thus, \(7.3 * 10^{-5} rad/s\) is the correct answer.
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Why does a ball not bounce back up to its original height?
Answers
Answer:
Gravity
Explanation:
an astronaut has a momentum of 280 kg and travels 10 m/s. what is the mass of the astronaut?
Answers
Answer:
The answer is
28 kgExplanation:
The mass of an object given it's momentum and velocity / speed can be found by using the formula
\(m = \frac{p}{v} \\ \)
where
m is the mass
p is the momentum
v is the speed or velocity
From the question
p = 280 kg/ms
v = 10 m/s
The mass of the object is
\(m = \frac{280}{10} = 28 \\ \)
We have the final answer as
28 kgHope this helps you
Question 18 of 25 What is the current model of the atom called? O A. Electron cloud model B. Plum pudding model OC. Planetary model O D. Nuclear model
Answers
The current model of the atom is called the electron cloud model or the quantum mechanical mode.
Current model of an atom explained.The current model of the atom is called the electron cloud model or the quantum mechanical model. This model describes electrons as existing in a three-dimensional region around the nucleus called the electron cloud, where the electrons are most likely to be found at any given time. This model incorporates principles of quantum mechanics, which recognizes the wave-particle duality of electrons and the probabilistic nature of their behavior, in contrast to the earlier classical models like the planetary model or the plum pudding model.
Therefore, the nuclear model, which describes the atom as consisting of a central nucleus surrounded by electrons, is a precursor to the modern quantum mechanical model.
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A coil of wire contains 100 loops. The coil is rotated such that the flux changes from 20 x 10-4Wb to 26 x 10-4Wb in 1.5 x 10-2s. What is the average induced emf? (a) 1.8V (b) 1.1V (c) 4.0V (d) none of the above
Answers
A coil of wire with 100 loops is rotated, causing a flux change from 20 x 10-4Wb to 26 x 10-4Wb in 1.5 x 10-2s. The average induced emf is 2.67 V. So, the answer is (D) none of the above.
The average induced emf can be calculated using the formula:
\(\text{emf} = \frac{\Delta\Phi}{\Delta t} \times N\)
where ΔΦ is the change in magnetic flux, Δt is the time taken for the change, and N is the number of loops in the coil.
Substituting the given values, we get:
\(\text{emf} = \frac{{(26 \times 10^{-4} \, \text{Wb}) - (20 \times 10^{-4} \, \text{Wb})}}{{1.5 \times 10^{-2} \, \text{s}}} \times 100\)
Solving the equation, we get:
emf = 2.67 V
Therefore, none of the given options (a), (b), or (c) is correct. The average induced emf is 2.67 V.
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Complete the passage to describe how electrons are represented in electron dot diagrams.
The maximum number of dots an electron dot diagram can have is The maximum number of dots drawn on
a side of a chemical symbol in an electron dot diagram is
ctivity
Answers
Answer:
The maximum number of dots an electron dot diagram can have is
✔ eight
The maximum number of dots drawn on a side of a chemical symbol in an electron dot diagram is
✔ two
Answer:
A: eight
B: two
Explanation:
I just did the assignment and got it correct.
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Sir Isaac Newton was among the first to observe the movement of objects and express those observations as laws. According to Newton's law of inertia, a body
a. in variable motion will remain in motion unless its state of matter changes.
b. with no kinetic energy will remain along a path with a constant radius.
c. with a variable potential energy will remain with a constant, nonzero acceleration.
d. in uniform motion will remain in motion unless it is acted upon by an outside force
Answers
Answer:
it's D
Explanation:
Newton's first law of motion states that a body at rest remains at rest or if in motion remains in motion at a constant velocity unless acted upon by a external Force
The correct option is D. In uniform motion will remain in motion unless it is acted upon by an outside force .
What is newton s law ?Unless influenced by an imbalanced force, an item at rest stays at rest, and an object in motion keeps moving in a straight path at a constant pace. An object's acceleration is determined by its mass and the force being applied.
Every time one object applies force to another, the other object applies an equal and opposite force to the first.
According to Newton's first law, unless pushed to alter its condition by the operation of an external force, every object will continue to be at rest or in uniform motion in a straight line. Inertia is the propensity to resist changes in a condition of motion.
Therefore, The correct option is D. In uniform motion will remain in motion unless it is acted upon by an outside force .
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earth has a mass of 5,970,000 how would scientists express this in a number scientific notation
Answers
Taking into account the definition of Scientific notation, the correct representation of 5,970,000 in scientific notation is 5.97×10⁶.
Definition of scientific notationScientific notation is a quick way to represent a number using powers of base 10.
The numbers are written as a product:
a×10ⁿ
where:
a is a real number greater than or equal to 1 and less than 10, to which a decimal point is added after the first digit if it is a non-integer number.n is a whole number, which is called an exponent or an order of magnitude. Represents the number of times the point decimal is shifted. It is always an integer, positive if it is shifted to the left, negative if it is shifted to the right.This caseIn this case, to write the number 5,970,000 in scientific notation, the following steps are performed:
The decimal point is moved to the left as many spaces until it reaches the right of the first digit. This number will be the value of a in the previous expression. Then a = 5.97The base 10 is written with the exponent equal to the number of spaces that the decimal point moves. This is a positive number because the decimal point is shifted to the left, and it will have a value of n = 6.Finally, the correct representation of 5,970,000 in scientific notation is 5.97×10⁶.
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A marble statue has a mass of 1800 kg and is
384 cm tall.
The density of marble is 2500 kg/m³.
Oliver makes a mathematically similar model
of the statue out of clay.
The model is 48 cm tall and has a density of
1300 kg/m³.
What is the mass of Oliver's model?
Give your answer to 3 significant figures.
Answers
Answer:
The answer is 144kg to 3s.f
Explanation:
convert cm to m
48/100=0.48
V=L³
V=0.48³
V=0.110592m³
\(density = \frac{mass}{volume} \)
1300=m/0.110592
m=1300×0.110592
M=144Kg o 3s.f
A simple pendulum is known to have a period of oscillation, t = 1. 55 s. Student a uses a digital stopwatch to measure the total time for 5 oscillations and calculates an average period t = 1. 25 s. Student b uses an analog wristwatch and the same procedure to calculate an average period for the 5 oscillations and finds t = 1. 6 s. Which period is more accurate, and why?.
Answers
The period measured by student b using analog wristwatch is more accurate because of less percentage of error.
What is accuracy in measurement?Accuracy is the capacity of an instrument to measure the precise value. In other words, it refers to how closely the measured value resembles a reference or genuine value. Small readings can be taken to increase accuracy. The calculation's error is decreased by the little reading.
Given that:
period of oscillation, t = 1. 55 s.
an average period for the 5 oscillations obtained by student a: t = 1. 25 s.
average period for the 5 oscillations obtained by student b: t = 1. 6 s
Hence, error percentage of student a = (1.55-1.25)/1.55 × 100% = 19.35%
error percentage of student b = (1.60-1.55)/1.60 × 100% = 3.22%
Hence, period measured by student b is more accurate because of less percentage of error.
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