The most common injury related to electrical hazards are Electrical burns.
What are electrical hazards?
The term "electrical hazard" refers to a major workplace risk that puts employees in danger of suffering burns, electrocution, shock, arc flash or arc blast, fire, or explosions.Electrical shock and burns are risks when contacting energized sources.The body enters the electric circuit, resulting in an electrical shock (when an individual comes in contact with both wires of an electrical circuit, one wire of an energized circuit and the ground, or a metallic part has been energized by contact with an electrical conductor).An electrical burn is a type of skin burn that develops when your body comes into contact with electricity. It is possible for electricity to pass through your body when it comes into contact with it. When this occurs, the voltage has the potential to harm tissues and organs.
Hence, The most common injury related to electrical hazards are Electrical burns.
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Which of the following changes would cause the fusion rate in the sun’s core to increase?
a. An increase in the core temperature
b. A decrease in the core radius
The changes that would cause the fusion rate in the sun’s core to increase are:
a.) An increase in the core temperature and
b)A decrease in the core radius
So, correct options are a and b.
The sun is the Main Sequence star. A Main Sequence star is powered by fusing hydrogen into the Helium within its core.
For this type of fusion to take place, a temperature of at least 10 million Kelvin is required, beyond the given point, the fusion rate is actually directly related to the core temperature. If temperature increases, the fusion rate will greatly increase.
Something similar happens if core reduces its radius. This can happen at the end of the star's lifetime, shortly before it becomes the red giant. Once hydrogen is depleted, the core will start to shrink because the force of gravity, and as it gets smaller, gets very more compressed, and its temperature increases
Hence, both a and b options are correct.
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a ball is thrown upward with a speed of 50 ft/s from the edge of a cliff that is 2100 ft above the ground. at what time t does the ball hit the ground? (recall that acceleration due to gravity is 32 ft/s2. round your answer to two decimal places or enter an exact answer.)
The time t the ball hit the ground is 11.3494 Sec.
Acceleration is the rate of change of the velocity of an item with appreciation to time. Accelerations are vector portions. The orientation of an item's acceleration is given by the orientation of the net pressure appearing on that object.
Calculation:-
S = ut + 1/2 at²
2100 = 50t + 0.5 × 32 t²
16 t² + 50t - 2100 = 0
T = 11.3494 Sec
Acceleration is the charge at which velocity modifications with time, in terms of each speed and route. A factor or an object moving in a straight line is accelerated if it quickens or slows down. movement on a circle is extended despite the fact that the rate is consistent because the course is continually changing.
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(a) calculate the self-inductance of a 54.0 cm long, 10.0 cm diameter solenoid having 1000 loops. mh (b) how fast can it be turned off if the induced emf cannot exceed 3.00 v and a current of 22.0 a flows through this inductor? s
Self-inductance is 23.4 mH 0.145 seconds it is turned off it be turned off if the induced EMF cannot exceed 3.00 v and a current of 22.0 a flows through this inductor.
What is Self-inductance?As the current in the coil changes, the magnetic flux associated with the coil also changes, thus inducing an electromotive force in the coil. This phenomenon is referred to as self-induction. Self-induction of a coil is a property due to its tendency to maintain a magnetic flux associated with it and to counteract changes in magnetic flux by inducing current. This property of coils is similar to mechanical inertia. That is why self-induction is called electric inertia. The self-inductance of a coil is numerically equal to the amount of magnetic flux associated with the coil when a unit current flows through it. The SI unit for self-inductance is the henry (H) or weber per ampere. 1H = 1Wb/A.to learn more about Self-inductance from the given link :
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Zn + HCl →ZnCl2 + _____H₂
type of reaction, and what is it balanced??
Answer:
Explanation:
Zn + 2 HCl → ZnCl₂ + H₂
The interaction of metals with acids refers to the substitution reaction
[tex]{ \green{ \boxed{ \red{ \sf{ \underline{Chemical \: displacement \: reaction}}}}}}[/tex]
The reaction between zinc and hydrochloric acid gives zinc chloride and liberates hydrogen gas.
The balanced chemical equation is as below.
[tex]{ \purple{ \sf{Zn + 2HCl{ \to}Zn Cl_{2} + H _{2}↑}}}[/tex]
in the united states , the energy sourced used predominantly for the production of electricity is .
Coal, natural gas, petroleum, and other fossil fuels made up about 61% of the electricity produced in this country. Nuclear energy made up over 19% of the total energy, while renewable energy made up about 20%.
Decomposing plants and animals are used to create fossil fuels. These fuels, which are located in the crust of the Earth, contain hydrogen and carbon that can be burned to produce energy. Examples of fossil fuels include coal, oil, and natural gas. The term "fossil fuel" refers to a hydrocarbon-containing substance that is naturally formed in the Earth's crust from the remains of extinct plants and animals and is extracted and burned as fuel. Natural gas, crude oil, and coal are the principal fossil fuels. We rely on those fuels to heat our homes, power our cars, run manufacturing and industrial processes, and give us electricity. To produce electricity, we burn, or combust, fossil fuels. The process of burning material to produce electrical energy is known as thermal generation. Combustion itself does not result in the production of electricity. Large water boilers are heated by the burning of coal or oil.
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calculate the minimum number of 15-ampere lighting branch circuits required in a residence of 1,850 square feet.
4 number of 15-ampere lighting branch circuits required in a residence of 1,850 square feet.
since we are provided with 15-ampere branch circuits, and the measurement for the residence is 1850 square feet .So first,
=>3 volt ampere x 1,850 /120 volts
=> 5,550 volt-amperes/120 volts
=> 46.25 amperes
Now we will divide the above value by the number of branch circuits
=>46.25/15 amperes = 3.08 = 4
So almost 4 branches are required for the given feet of a residence
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the disk swings left-and-right on the pivot about the equilibrium position directly below the pivot point a. calculate the period of small oscillations of the disk. use a small angle approximation.
The period of small oscillations of the disk is 2π√L∕g
What is simple harmonic oscillation?Simple harmonic motion can be described as oscillatory motion in which the acceleration of a particle at each position is directly proportional to its displacement from its mean position. This is a distinct case of oscillatory motion. You can represent SHM with a single harmonic sine or cosine function.
For small-angle oscillations, the approximation sinθ≈θ applies, which is a linear differential equation similar to that for simple harmonic oscillators. In this regime the pendulum swings in one period.
T₀ = 2π√L∕g
Where, T₀ = Period of small oscillations
L = length of the string to which the disc is attached to
g = gravitational acceleration.
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in a completely inelastic collision between two objects, where the objects stick together after the collision, is it possible for the final kinetic energy of the system to be zero?
Yes, the final kinetic energy of the system can be zero if the collision is head-on and both objects have the same magnitude of momentum.
What is kinetic energy?Kinetic energy is the energy that an object has as a result of motion. To accelerate an object, a force must be supplied to it. To apply a force, we must exert effort.Energy is transferred to the object once the work is finished, at which point it moves at a new, constant speed.The energy of motion is known as kinetic energy, and it can be observed in the motion of a particle, an object, or a collection of particles. A person walking, a baseball being thrown, a piece of food falling from a table, or a charged particle in an electric field are all examples of moving objects that consume kinetic energy.To learn more about kinetic energy from the given link :
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A car travels forward with constant velocity. It goes over a small stone, which gets stuck in the groove of a tire. The initial acceleration of the stone, as it leaves the surface of the road, is.
The initial acceleration of the stone is an option (A) vertically upward .
The reason that the tire is rotating with a uniform angular speed and moving with a constant linear pace, is so that as soon as a small stone is caught into the groove of the tire the velocity of the stone is the same as that of the tire.
Acceleration is the rate of change of the velocity of an item with appreciation to time. Accelerations are vector portions. The orientation of an item's acceleration is given by the orientation of the net pressure appearing on that object.
Acceleration is the charge at which velocity modifications with time, in terms of each speed and route. A factor or an object moving in a straight line is accelerated if it quickens or slows down. movement on a circle is extended despite the fact that the rate is consistent because the course is continually changing.
αc = ω²R
The direction of net acceleration is towards its center. Hence answer is option A.
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Disclaimer:- your question is incomplete, please see below for the complete question.
(A) vertically upward
(B) horizontally forward
(C) horizontally backward
(D) zero
(E) upward and forward, at approximately 45° to the horizontal
a student lifts a weight of 10.0 n a distance of 0.5 meters. if this exercise is repeated 50 times in 100 seconds, then the power of this exercise is: a. 2.5 watts. b. 3.1 watts. c. 3.6 watts. d. 4.0 watts. e. 4.8 watts.
The option E is correct. 4.8 watts, The quantity of energy moved or converted per unit of time is known as power in physics. The watt, or one joule per second, is the unit of power in the International System of Units.
Power is also referred to as activity in ancient writings. A scalar quantity is power. Power is an expression of energy expended through time (effort), of which force is an element, as opposed to force itself, which is the fundamental outcome of an interaction between two objects. Power can be measured and described, but a force is a real physical entity, but power is not. W = mgh
=10*9.8* 0.5
=49 newton
P= W/T
=49/ 100
=4.8 watts
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In a tennis serve, a 0.070 kg ball can be accelerated from rest to 35 m/s over a
distance of 0.80. Find the force exerted on the ball during the serve.
How can gas density be used to explain why hydrogen rises in air and carbon dioxide sinks?
Answer:
Explanation: The density of gas differentiates all the varieties of gas present in the atmosphere.
HYDROGEN- it is a lighter gas having a lesser density.
For example, a hydrogen balloon displaces the air around it thus making it rise.
CARBON DIOXIDE: It is a denser gas as it makes the balloon heavier than the air pressure around it thus making it sink.
I hope the explanation was helpful. :)
Which two statements describe behaviors of particles that are related to the physical properties of the materials?.
A and C are the two assertions that define the actions of particles in relation to the physical characteristics of the materials.
Which one is a physical asset?A quality of matter that is unrelated to a change in its chemical makeup is called a physical property. Density, color, toughness, melting , boiling points, & electrical conductivity are common examples of physical qualities.
Why are physical characteristics significant?In order to observe and characterize matter, physical attributes are used. Physical characteristics of substances and systems are frequently referred to as extensive and intensive characteristics. This classification deals to how the attributes rely on how big or big the system or thing is.
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The correct question is :
Which TWO statements describe behaviors of particles that are related to the
physical properties of the materials?
A. They allow electrons to move freely between them.
B. They do not easily form bonds with atoms of other elements.
c. They change their positions relative to one another.
D. They combine with oxygen atoms to form a new substance.
a square coil, enclosing an area with sides 6.4 cm long, is wrapped with 3,038 turns of wire. a uniform magnetic field perpendicular to its plane is turned on and increases to 0.47 t during an interval of 1.2 s. what is the magnitude of the induced voltage in the coil?
The induced voltage in the coil is 0.25 V.
What is voltage?Voltage is the pressure from the power source in an electrical circuit that forces charged electrons (current) through conducting coil , causing the electrical circuit, etc. to do work. Let the light shine. An example of a DC voltage is the potential difference across the terminals of an electrochemical cell. AC voltage is present across the terminals of a typical power outlet. Voltages create electrostatic fields even when charge carriers are not moving. A volt is a unit of potential difference, which is also called voltage. A magnitude of 1 volt is officially defined as the potential difference between two points on a cable that will carry 1 ampere of current when 1 watt of power is dissipated in the cable.To learn more about voltage from the given link :
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an electron is accelerated from rest by a potential difference of 320 v. it then enters a uniform magnetic field of magnitude 230 mt with its velocity perpendicular to the field. (a) calculate the speed of the electron.
Answer: 1.42 sec
Explanation:
The object is dropped from the height. So initial velocity, u = 0 m/s.
Height = 10m and Acceleration = g = 9.8 m/s² (or g can be approximated to 10 m/s²)
Using the Second equation of motion;
s = ut + (1/2) at²
~ 10 = 0 + (1/2) gt²
~ t² = 20/9.8 = 100/49
~ t = 10/7 seconds = 1.42 seconds
a 150kg monkey hangs from a cord suspended from the ceiling of an elevator. the cord can withstand a tension of 200N and breaks as the elevator accelerates. what was the elevators minimum acceleration (in magnitude and direction,
Answer:
The elevator moves up with an acceleration of 3.5 m/s²
Explanation:
Given:
m = 15 kg (not 150!! :))
Tmax = 200 N
g = 9.8 m/s²
____________
a - ?
The elevator moves up with an acceleration a:
Tmax = m·(g + a)
g + a = Tmax / m
a = Tmax / m - g
a = 200 / 15 - 9.8 ≈ 3.5 m/s²
A string is wrapped around a pulley with a radius of 2. 0 cm. The pulley is initially at rest. A constant force of 50 n is applied to the string, causing the pulley to rotate and the string to unwind. If the string unwinds 1. 2 m in 4. 9 s, what is the moment of inertia of the pulley?.
The moment of inertia of the pulley if a string is wrapped around a pulley with a radius of 2.0 cm and a constant force of 50 N is applied to the string is 0.2 kg m²
s = ut + 1 / 2 at²
u = 0
s = 1.2 m
t = 4.9 s
1.2 = 0 + 1 / 2 * a * 4.9²
1.2 = 12.01 a
a = 0.0999 m / s²
a = r α
a = Tangential Acceleration
α = Angular Acceleration
r = 2 cm = 0.02 m
α = a / r
α = 0.0999 / 0.02
α = 4.995 rad / s²
I = τ / α
τ = r F
I = Moment of inertia
τ = Torque
F = Force
F = 50 N
τ = 0.02 * 50
τ = 1 N m
I = 1 / 4.995
I = 0.2 kg m²
Therefore, the moment of inertia of the pulley is 0.2 kg m²
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identify the component that converts direct current (dc) into the alternating current required to power the electric motors.
A component that converts direct current (dc) into alternating current (ac) is an inverter.
The electrical current in direct current (DC) only flows in one direction. The electrical current in alternating current (AC) can flow in both ways. The electrons in AC can switches back and forth at some intervals. The inverter is a device that can offer precise variable control of the speed of a motor and it changes the direct current (DC) to alternating current (AC).
The inverter has a part that is like an electronic circuit that regulated voltages to work, so we can convert DC to AC, and we can change back into DC again.
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radiation dosages based on potential damage is in group of answer choices a. rads. b. joules. c. rems. d. none of the above
Using the theories of radiation dosages, we got that radiation dosages based on potential damage is in c)rems.
A dose of medical radiation is not like the dose of medicine. When it comes to the radiation dose, there are different types of and units of measurement.
When we think of the dose of the medication, we think of an absolute measurement of the quantity which we take. But radiation isn't measured by the quantity we take.
Radiation from the medical examinations is similar to sunlight. The effect of the sunlight on the skin depends on the light's intensity and how long a person stays in it.
Sunlight Effecting Factors are:
IntensityLength of exposureSensitivity of the skinHence, radiation dosages based on potential damage is in c)rems
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the wheel is composted of a 10 kg hoop stiffened by 4 thiin spokes, each with a mass of 2 kg. a horizontal force of 40 n is applied to the wheel initially at rest. calculate the angular velocity of the wheel after its center has moved 3 m
The Angular velocity is 1.165 rad/s.
What is horizontal force?
Horizontal force is defined as a force applied in a direction perpendicular to the horizon. There are two parts to the force applied to a body: a horizontal component as well as a vertical component. The horizontal component of a force, as its name implies, is directed parallel to the surface, while the vertical component is directed perpendicular to a position of the body. In nature, almost all moving things have both vertical and horizontal components of force.
F = 40 N
m= 10 kg = 98.1 N
r= 0.3 m
Circumference of circle = 1.884 m
The Centre of the circle moves 1.884 m then the angle of rotation is 360
Applying the circle arc length formula (s = r θ)
s= 3 -1.884 = 1.116m
θ= 2310
F = m x v2 /r
V = sqrt(F x r/m)
= sqrt(40 x 0.3 / 98.1)
= 0.35 m/s
Angular velocity ω,
= v/r
= 0.35/0.3
=1.165 rad/s
Hence, the angular velocity is 1.165 rad/s
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when two parallel lines are cut by a , then eight angles are formed around the transversal. there are actually only two different angle measures formed; four angles measure congruent, (greater than 90 degrees) and the other four angles measure acute, unless the transversal is perpendicular forming eight angles. we also have angle pairs that are formed. angles f and g are called angles and are congruent. angles a and e are called angles and are congruent. angles c and f are called alternate interior angles and are congruent. angles c and e are called same side interior and are . angles f and h are also supplementary because they make a angle.
When two parallel lines are cut by a , then eight angles are formed around the transversal.
What is angle?
An angle is the figure formed by two rays, called the sides of the angle, sharing a common endpoint, called the vertex of the angle. Angles formed by two rays lie in the plane that contains the rays. Angles are also formed by the intersection of two planes.
Types of angle:
Acute Angles.
Obtuse Angles.
Right Angles.
Straight Angles.
Reflex Angles.
Full Rotation
When two parallel lines are cut by a , then eight angles are formed around the transversal.
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if the actual thermal efficiency of the plant is 60% of the maximum, at what rate must heat be discarded to the rive
If the actual thermal efficiency of the plant is 60% of the maximum is Heat capacity of water is 4.2 kJ/kgK so the temperature rise is 2.53 K
The maximum efficiency is that of Carnot engine. Let's suppose the
power plant is Carnot engine, so
n=1 -Tc/Th
=1-293.15/588.15
=0.5
(b) The actual efficiency is 60% of the maximum so
n = 0.6 . 0.5
= 0.3
Heat capacity of water is 4.2 kJ/kgK so the temperature rise is
ΔT= 1750 . 10³ kJ/s / 165 . 10³ kg/s . 4.2 kJ/kgK
ΔT =2.53 K
In thermodynamics, a device's thermal efficiency is a dimensionless performance metric. Examples of such devices include internal combustion engines, steam turbines, steam engines, boilers, furnaces, refrigerators, and air conditioners. A system's thermal efficiency is determined by how much work is produced for every unit of heat input. Work is produced by heat engines. The percentage of heat that is converted into useful work is expressed by thermal efficiency. The carbon footprint of a building is significantly decreased by an envelope that is thermally efficient.
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the vibration packages dropped from a height of h meters can be approximated by considering fig.2 and modeling the point of contact as an impulse applied to the system at the time of contact. calculate the vibration of the mass m after the system falls and hits the ground. assume that the system is underdamped.
The vibration of a package dropped from the top of h meters may be approximated by thinking about figure P3.10 and modeling the factor of touch as an impulse.
Vibration is a mechanical phenomenon whereby oscillations arise about an equilibrium factor. The word comes from the Latin vibration. The oscillations can be periodic, along with the movement of a pendulum or random, such as the movement of a tire on a gravel street.
Vibration is a speedy back-and-forth motion of a frame approximately a vital function. The amplitude of an oscillation is the maximum displacement of the bob from its mean role at some point of oscillation. Ultrasonic waves are sound frequencies above 20,000 Hz, which human beings can't listen to those waves.
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If the pressure of a gas is tripled and the absolute temperature of the gas is quadrupled, by what factor will the volume of the gas change?.
The volume of the gas change by a factor 4/3.
An ideal gas is a theoretical gas composed of many randomly transferring factor particles that aren't difficult to interparticle interactions. the best gasoline idea is beneficial because it obeys the precise gas law, a simplified equation of country, and is amenable to evaluation under statistical mechanics.
Calculation:-
From the ideal gas equation
PV = nRT
V = nRT/P
where n and R are constant
new changes
P' = 3P
T' = 4T
V = nR4T/3P
Hence, the volume changed by a factor of 4/3.
Volume is a degree of occupied three-dimensional space. it's far more frequently quantified numerically the usage of SI-derived gadgets or by way of diverse imperial gadgets. The definition of length is interrelated with the extent.
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A woman is pushing a 100Kg couch across her room. Her arms are angled down at 25 degrees
from the horizontal as she applies a 70N force. What is the normal force applied to the couch?
The normal force applied to the couch is 70.42N
Given,
Mass(m)- 100kg
Force(f)- 70N
Angle(a)- 25 degrees
We know,
Acceleration(n): force/mass
so, n = 70/100
= 0.7
now,
Normal Force = mn + sin a
so,
= 0.7*100 + 0.42
= 70 +0.42
70.42N
What is mass?
The amount of matter in a particle or object is represented by the dimensionless quantity mass (symbolised m). The kilogramme is the International System's (SI) preferred unit of mass (kg).What is force?
The term "force" has a specific meaning in science. At this level, calling a force a push or a pull is quite appropriate. A force is not something an item "has in it" or that it "contains." One thing experiences a force from another. There is no distinction between living and non-living entities in the concept of a force.To know more about force, checkout this link.
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suppose that instead of steel balls we use putty balls. they will collide inelastically and remain stuck together after the collision. how high will the balls rise after the collision?
The law of conservation of momentum and collision, after collision, the kinetic energy will become zero, and the balls rise after the collision is 15.4cm.
What is the law of conservation of momentum?
Momentum is neither created nor destroyed inside a problem domain, according to the principle of momentum conservation, but only modified by forces acting in accordance with Newton's equations of motion.
What is collision?
The abrupt, violent coming together in close proximity of two bodies, such as two billiard balls, a golf club and a ball, a hammer and a nail head, two railroad carriages when coupled, or a falling object and a floor Collision is also known as "impact."
The concepts used to solve this problem are conservation of energy and conservation of momentum.
Initially, use the conservation of energy to find the height that the other ball raises.
Finally, use the conservation of momentum before and after collision to find the height of the putty ball after collision.
The conservation of energy principle is stated as follows:
“Total energy of an isolated system under the action of only conservative forces remains constant.”
The saved energy in an object due to its position is called potential energy.
Explanation:
Momentum is conserved in inelastic collision. Total energy is equal to potential plus kinetic energy.
At equilibrium position, in total energy, the potential energy will become zero before collision.
After collision, the kinetic energy will become zero.
Therefore, after collision, the kinetic energy will become zero, and the balls rise after the collision is 15.4cm.
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if the front sprocket (driver) is rotating at 100 rpm: a) what is the angular speed of the back (driven) sprocket?
The calculated value is 240 rpm. The driving sprocket is the one fastened to the pedals or the engine crankshaft, and the driven sprocket is the one fastened to the back wheel.
Omega is the symbol for angular speed, the angle of rotation is stated in radians, and the time required to complete the rotation is t. Sprocket ratio equals T1/T2.
The sprocket ratio is 20/80
= 1/4
= 1:4, or simply 4,
if the front and rear sprockets on a bicycle each have 20 teeth.
Ratio of the sprockets is T1/T2 = V1/V2.
When the driving sprocket is turned at 60 revolutions per minute, the rear wheel and sprocket spin at:
V2 = 240 rpm;
1/4 = 60/V2 rpm.
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A driver takes her car to the market 40m in one direction then after shopping, she drives the car back to her house 40m in the opposite direction. What is the total displacement?
Motion of car from market 40 m in one direction then after shopping, she drives the car back to her house 40 m in the opposite direction. he total displacement is 0 meter.
What is motion?The phenomenon of an item changing its position with respect to time is known as motion in physics. In mathematics, displacement, distance, velocity, and acceleration are used to explain motion.
Displacement is change in distance between two points.
Motion of car from market 40 m in one direction then after shopping, she drives the car back to her house 40 m in the opposite direction. he total displacement is 0 meter.
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antangonists function by?
Answer:7777
Explanation:
Answer:
Explanation:
An antagonist does the opposite of an agonist. It binds to receptors, and stops the receptor from producing a desired response.
in order for the earth to be at rest in the center of the system of the sun, planets, and planets, and comets, there is required both universal gravity and another force in addiction that acts on all bodies equally meaning
In order for the earth to be at rest in the center of the system of the sun, planets, and planets, and comets, there is required both universal gravity and another force in addiction that acts on all bodies equally meaning Gravitational force.
Newton's law of universal gravitation states that every object attracts every other object with a force.
That is exactly the form of the gravitational force, with the generic gravitational regular G as the regular of proportionality. consequently, Newton's legal guidelines of motion, with a gravitational force used within the second regulation, imply Kepler's legal guidelines, and the planets obey the equal laws of movement as objects at the surface of the Earth.
The pressure of gravity, or gravitational force, pulls items with mass in the direction of each other. We often consider the force of gravity from Earth. This pressure is what keeps your frame on the floor. however, any object with mass exerts a gravitational force on all different items with mass.
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