The distance separating these two charges is 2.3 m. Hence, option (B) is correct.
What is electric force?Electric force is the attracting or repulsive interaction between any two charged particles.
Given that: the two charges are 2.4 × 10^-6 C and -4.1 × 10^-6 C.
Force experienced by it = 1.7 × 10^-2 N.
Let the distance between them = r, then
F = kQq/r²
1.7 × 10^-2 = {9×10^9×2.4 × 10^-6×4.1 × 10^-6 }/r^2
r =√[ {9×10^9×2.4 × 10^-6×4.1 × 10^-6 }/ 1.7 × 10^-2 ]
=2.3 m.
Hence, the distance between two charges is 2.3 m.
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an all so annoying fish fly bug encounters moving vehicle and splatters against the winshield. compared to the force of the car on the bug, the force of the bug on the car is.
The force exerted by the insect and the automobile is equal and opposite, according to Newton's law.
What exactly is acceleration?
In physics, acceleration is defined as the rate of change in velocity. As a result, the unit is m/s2. According to Newton's second equation of motion, the force acting on a moving body is the product of its mass and acceleration.
As a result, F= ma an implies that the acceleration is inversely proportional to the mass. As a result, a body with more mass will have less acceleration but more force.
An action has an equal and opposite response, according to the third law of motion. Thus, the force exerted by the bug on the car and the force exerted by the car on the bug are equal and opposite, with the bug accelerating faster due to its lower mass.
The force exerted by the insect and the automobile is equal and opposite, according to Newton's law. As a result, their acceleration reduces as their mass grows. As a result, the bug's acceleration will be greater than that of the automobile.
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Which of the following statement describes the coriolis effect? Coriolis effect causes the air moving into a low pressure system to bend to the left in the northern hemisphere Coriolis effect causes the air moving out of a high pressure system to bend to the left in the northern hemisphere. Coriolis effect causes the air moving into a low pressure system to bend to the right in the southern hemisphere. Coriolis effect causes the air moving out of a high pressure system to bend to the left in the southern hemisphere. All of the above
C is the finest statement to describe the Coriolis effect. The apparent route of ocean currents curves due to the rotation of the Earth.
What is the effect of Coriolis?
This is an evident force, relative to the earth's surface, that causes moving things to the right within the Northern Hemisphere and to the left within the Southern Hemisphere as a result of the earth's rotation.
The Coriolis effect is an apparent force, relative to the earth's surface, that causes moving objects to deflect to the right within the Northern Hemisphere and to the left within the Southern Hemisphere as a result of the earth's rotation.
C is the finest statement to describe the Coriolis effect. The apparent route of ocean currents curves due to the rotation of the Earth.
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Alex drives 1900 meters in 200 s. Assuming he does not speed up or slow down, what is his speed?
A train is moving at a speed of 65.0 mi/h. The ticket collector is walking 2.00 mi/h toward the front of the train. How fast is the ticket collector moving from the point of view of a person on the train?
Answer:
the ticket collector is moving at 2.00 mi/h in the same direction, the relative speed of the ticket collector to the person on the train is 65.0 mi/h - 2.0 mi/h = 63.0 mi/h.
Explanation:
From the point of view of a person on the train, the ticket collector is moving at a speed of 63.0 mi/h. To determine this, we need to subtract the speed of the train from the speed of the ticket collector in the same direction. Since the train is moving at 65.0 mi/h
In the laboratory, you connect a resistor and a capacitor with unknown values in series with a battery of emf ε = 12 V. You include a switch in the circuit. When the switch is closed at time t = 0, the circuit is completed, and you measure the current through the resistor as a function of time as plotted below. A data-fitting program finds that the current decays according to the equation Using common symbols for the battery, the resistor, the capacitor, and the switch, draw the circuit that you constructed (on paper). Show the circuit before the switch is closed and include whatever other devices you need to measure the current through the resistor to obtain the above plot. Label each component in your diagram.
The voltage across the capacitor is VC=qC since the formula for capacitance is C=q/V. Ohm's law states that the current is defined as I=dq/dt and the potential drop across the resistor is VR=IR.
What happens when a capacitor and a resistor are connected in series?
A series connection between a resistor and a capacitor creates an RC circuit, which charges the capacitor progressively through the resistor until the voltage across it equals the supply voltage. The time needed to fully charge the capacitor is about equal to 5 time constants, or 5T.
How can a capacitor with a resistor issue be fixed?
Simply use V=IR, where V is the battery voltage and R is the resistor resistance, to determine the current flowing through the circuit, and then solve for I. When the capacitor is finished charging, the current has progressively decreased and is getting close to zero.
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9. Which Lewis structure represents a molecule with a bent geometry?
Answer:
The third structure is a bent geometry of a molecule as it consists of one atom of B(boron)and 3 atoms of Cl(chlorine) linked to the atom of and the bond angle is 120°
Answer:
The first one.
Explanation:
A 1.60 kg, horizontal, uniform tray is attached to a vertical ideal spring of force constant 195 N/m and a 280 g metal ball is in the tray. The spring is below the tray, so it can oscillate up-and-down. The tray is then pushed down 15.0 cm below its equilibrium point (call this point A) and released from rest. a) How high above point A will the tray be when the metal ball leaves the tray? (Hint: This does not occur when the ball and tray reach their maximum speeds.) b) How much time elapses between releasing the system at point A and the ball leaving the tray? c) How fast is the ball moving just as it leaves the tray?
(a) The height above point A will be the tray when the metal ball leaves the tray is 29.24 cm.
(b) The total time elapses between releasing the system at point A and the ball leaving the tray is 0.09 seconds.
(c) The speed of the ball moving just as it leaves the tray is 1.16 m/s.
A) F= gx
ma=gx
(2.295)(9.8)=190x
X= 11.84 cm
B) h= 11.84+17.4 = 29.24 cm
Y=Acos√kt/m-0
T= 0.09s
C) ½ mv² + ½ ky² = ½ kA²
v² = 1.16m/s
What is speed?
In everyday use and in kinematics, the velocity (commonly referred to as v) of an object is the amount of change in its position over time, or the amount of change in its position per unit time; it is therefore a scalar quantity.To know more about speed, click the link given below:
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Problem 4 Consider two superconducting wires, tin (Sn, Type I) and Nb3Sn (Type II), each 1 mm in thickness. The magnetic field on the surface of a current-carrying conductor is given by BMol 2nr a) Assuming that Sn wire loses its superconductivity when the field at the surface reaches the critical field (0.2 T), calculate the maximum current and hence the critical current density that can be passed through the Sn wire near absolute zero of temperature. b) Calculate the maximum current and critical current density for Nb3Sn wire using the same assumption as in part (a) but taking the critical field to be the upper critical field Bc2, which is 24.5 T at 0 K. How does your calculation of Je compare with the critical current density of about 10" A/m² for Nb3Sn at OK?
This value is close to the experimental value of approx. 1011 A/m2
Super conductivity, or current flow with zero electric resistance, is the ability to conduct electricity without suffering energy losses.
The superconductivity is quenched when current through the wire causes the critical magnetic field at the wire surface.
Given that,
B = 0.2T
R = 0.001m (R = r/2)
a. Maximum current, critical current density
Ic = B*2πr / μo
Ic = {0.2 * 2 * (22/7) * (0.001/2)} / 4 * (22/7) * 10-7
Ic = 500A
Thus, maximum current Jc=Ic/A = 6.363 * 108 A/m2
It turns out that the critical current density for TYPE I superconductors is indeed in the range of this magnitude. The superconductivity is destroyed by a current that produces a field on the conductor surface that is equivalent to B.
b. Type II superconductor, Nb3Sn
Critical field is the upper critical field, B2
Ic = B*2πr / μo
Given that, B = 24.5T, Thickness = 0.001m
Ic = {24.5 * 2 * π * (0.001/2)} / 4 * π *10-7
Ic = 61250A
Thus, Maximum Current Jc= Ic/A = 7.795 * 1010 A/m2
This value is close to the experimental value of approx. 1011 A/m2
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b. Calculate the force acting on a falling 2 kg mass.
Answer: 9.81(2)=19.62N
Explanation:
An egg is attached to a parachute. It is dropped (starting from rest) from a height of 16 m. The parachutes slows it's acceleration downward to 0.4 m/s^2. It can hit the ground at a velocity of 0.8 m/s without cracking. Does the egg crack when it hits the ground?
A) Yes
B) No
PLEASE HELPPPPPP ME
An egg is attached to a parachute and dropped from a height of 16 meters, after hitting the ground the egg will crack. Hence, option A is correct.
What is Acceleration?A moving object's speed and orientation vary over time at a certain rate, which is known as acceleration. An object or location is considered to be accelerated when it moves more quickly or more slowly in a straight path.
A circle's motion increases despite its constant speed because its direction is always changing. For all other motions, by and also to acceleration is used.
Because of its magnitude and direction, it is a vector quantity.
As per the given information in the question,
The egg is attached to a parachute.
The dropping height of the egg is 16 m.
The given velocity is 0.8 m/s.
When the egg will strike the ground with minimal velocity doesn't matter it will break anyway because the out shell of the egg is very smooth or soft and every soft strike will lead to the breaking of the egg.
Then the egg will crack after hitting the ground.
Hence, option A is correct.
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Consider two carts, of masses m and 2m, at rest on an air track. If you push first one cart for 3 s and then the other for the same length of time, exerting equal force on each, the momentum of the light cart is ________ the momentum of the heavy cart.a) four timesb) twicec) equal tod) one-halfe) one-quarter
The value of the momentum on the second cart is p₂ = v₂m₂ = 2vm.
What is momentum?Momentum is defined in Newtonian mechanics as the product of an object's mass and velocity. It is a vector quantity with magnitude and direction. If an object's mass is m and its velocity is v,
Given that consider two carts, of masses m and 2m, at rest on an air track. if you first push one cart for 3 s and then the other for the same length of time, exerting equal force on each.
The momentum on the second cart will be calculated as,
F = m₁ a₁ = m₂ a₂
if m₁ = m and m₂ = 2m :
F = ma₁ = 2m a₂ ⇒ a₁ = 2 a₂
Since v = at + v₀ with t = 3, v₀ = 0 ⇒ v = 3a:
v₁ = 2 v₂
Since p = vm with v₁ = 2v and v₂ = v :
p₂ = v₂m₂ = 2vm
Therefore, the value of the momentum on the second cart is p₂ = v₂m₂ = 2vm.
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if the mass of an object were doubled, its weight would be
Weight of a body is defined as the force with which it is attached to the earth.
mass is the total quantity of matter present.
the weight of something is given as mass * acceleration
weight of an object is directly proportional to the mass of the object. so, if mass doubles, weight will also double.
hope this helps :)
- jeron
A cannon is fired horizontally at 235 m/s off of a 61 meter tall, shear vertical cliff. How many seconds will have elapsed before the cannon ball strikes the ground? Round to the nearest hundredth.
Answer:
Hope this helps!
Explanation:
The time elapsed before the cannon ball strikes the ground can be found by using the equation for kinematic vertical motion,
t = (2*d)/g
Where d is the vertical distance and g is the acceleration due to gravity (9.8 m/s^2).
t = (2*61)/9.8
t = 12.24 seconds
The time elapsed is 12.24 seconds, rounded to the nearest hundredth is 12.24 seconds.
why fan videos be streamed from the cloud to a computer with no lost quality
Videos can be streamed from the cloud to a computer with no loss in quality because Digital signals are used to transmit data to and from the cloud.
How do digital signals work?
An established or one that represents data as a step made up of discrete values is known as a digital signal. There is no noise produced by digital signals. Electronic signals sent as pulses are used to transmit digital signals to computers. These signals can be found in things like digital phones and computers.
Because digital signals are used to transport data to and from the cloud, it should be noted that videos are said to stream from the cloud to a computer without quality degradation.
Videos can be streamed from the cloud to a computer with no loss in quality because Digital signals are used to transmit data to and from the cloud.
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you hold a spherical salad bowl 50 cm in front of your face with the bottom of the bowl facing you. the salad bowl is made of polished metal with a 36 cm radius of curvature.(a) Where is the image of your 5.0-cm-tall nose located?(b) What are the image’s size, orientation, and nature (real or virtual)?
a) q = 28.57 cm , b) h ’= -0.114 cm the image is inverted and REAL
How does physics create an image?Because light can come from an item in many different directions, a picture can be created. According to the rule of reflection, some of the light (which we depict as rays) hits the screen and reflected off of it.
Briefing:
For this exercise we will use the equation of the constructor
1 / f = 1 / p + 1 / q
where f is the focal length of the salad bowl, p and q are the distance to the object and the image
The metal salad bowl behaves like a mirror, so its focal length is
f = R / 2
f =36/2
f = 18 cm
a) Suppose that the distance to the object is p = 50 cm, let's find the distance to the image
1 / q = 1 / f - 1 / p
1 / q = 1/18 - 1/50
1 / q = 0.035
q =28.57 cm
b) to calculate the size of the image we use the equation of magnification
m = h’/ h = - q / p
h ’= - q / p h
h ’= - 28.57 / 50×5
h ’= -0.114 cm
The negative sign means that the image is inverted
As the rays of light pass through the image this is REAL.
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Which of the following quantities is conserved for plant orbiting a star in a circular orbit? Only the planet itself is to be taken as the system the star is not included a. Momentum and energy b. Energy and angular momentum c. Momentum, angular momentum and energy d. None of the above.
Energy and angluar momentum quantity is conserved for plant orbiting a star in a circular orbit.
What is energy?Energy is ability to do the work.scientist defines energy as the ability to do work.
Energy and angular momentum, arter all other factors- change.
In the Earth-Satellite system, a gravitational force acts to the join the two bodies. Thus, there is no torque due by to gravitational force. Hence, the angular velocity is conserved.
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based on what you know about the moons of saturn, select all of the correct statements from the following list.
Saturn's atmosphere is substantially less active than Jupiter's because it is twice as far away from the sun.
how many moons are there for saturn ?
Saturn's moons are many and diverse, ranging from small moonlets barely tens of metres wide to Titan, which is bigger than Mercury. Saturn has 83 verified moons with proven orbits that are not contained in its rings, with just 13 having diameters more than 50 kilometres, as well as thick rings with millions of embedded moonlets and uncountable smaller ring particles. Only one or two of Saturn's moons, Titan and maybe Rhea, are massive enough to have collapsed into a relaxed, ellipsoidal form. Titan, the second-largest moon in the Solar System (after Jupiter's Ganymede), has a nitrogen-rich Earth-like atmosphere and a terrain that includes dry river networks.
Smaller moons "shepherd" or retain particles in their rings in the ring system.
Saturn's atmosphere is substantially less active than Jupiter's because it is twice as far away from the sun.
Saturn's rings are largely comprised of ice particles.
Saturn is not the only planet with a ring system, despite being the most extensive.
Some ring particles are miniature moons separated by tidal forces.
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A future space vehicle massing 250,00 kilograms lifts off vertically from the lunar surface at a net acceleration of 3.27 m/s^2. What is the net force that the Moon exerts on the space vehicle, in Newtons?
The net force acting on the future space vehicle be 81750 Newton.
What is force?The definition of force in physics is: The push or pull on a mass-containing item changes its velocity.
An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude.
Given parameters:
Mass of the future space vehicle: m = 250,00 kilograms.
Net acceleration of the future space vehicle: a = 3.27 m/s^2.
Hence, according to Newton's 2nd law of motion:
Net force acting on the future space vehicle: F = mass × acceleration
= 25000 × 3.27 Newton
= 81750 Newton.
Hence, net force acting on the future space vehicle be 81750 Newton.
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You would like a pendulum that swings back and forth once every 2 seconds, but the one you have swings once every 1.9 seconds. Which of the following should you do to adjust it so that it has the desired period?a) Add more mass to the pendulum.b) Make the pendulum slightly longer.c) No answer text providedd) Remove some mass from the pendulum.e) No answer text provided.f) Make the pendulum slightly shorter.
You need to make your pendulum slightly longer
What is a pendulum?
A pendulum is a body suspended from a fixed point so that it can swing back and forth under the influence of gravity. The time interval of a pendulum's complete back-and-forth movement is constant.
Your pendulum does a complete swing in 1.9 seconds. You want to SLOW IT DOWN so it takes 2.0 seconds.
Longer pendulums swing slower.
You need to make your pendulum slightly longer
If your pendulum is hanging by a thread or a thin string, then its speed doesn't depend at all on the weight at the bottom. You can add weight or cut some off, and it won't change the speed a bit.
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What is the formula for conservation of energy if there is no resistance and no friction?
Answer:
If there is no friction then energy is conserved. There are two parts in this case, potential energy and kinetic energy. The object starts out with no kinetic energy and potential energy of PE = mgh where m is the mass, g is acceleration due to gravity and h is its initial height above the ground.
Explanation:
Neglecting air resistance, what would happen if you were a
passenger in a convertible car traveling at a constant velocity
and threw a ball straight up in the air?
If I were a passenger in a convertible car traveling at a constant velocity and threw a ball straight up into the air, neglecting air resistance, the ball would follow a parabolic path and would eventually fall back into the car.
When the ball is thrown straight up, it will initially have a vertical velocity of 0 at the top of its trajectory. This means that it will begin to fall back down at the same speed that it was thrown up, due to the force of gravity. Since the car is moving at a constant velocity, the ball will appear to fall back into the car from the perspective of someone inside the car. However, from an outside perspective, the ball will be seen to fall to the ground at a point ahead of the car.
It's important to note that this scenario is based on the assumption that there is no air resistance. In the real world, air resistance would cause the ball to slow down as it moves through the air, which would affect the trajectory of the ball and would likely cause it to fall outside of the car.
Water + HeatObservations Before Interaction
Bumper car A (296 kg) moving +3.74 m/s makes an
elastic collision with bumper car B (222 kg) moving
+1.85 m/s. What is the velocity of car A after the
collision?
Use the formula to find the final velocity of car A.
Bumper Car A
m₁ = 296 kg
V₁i = 3.74 m/s
m₁ - m²)√₁i+
m1
m2
V₁f = (m
Bumper Car B
m₂ = 222 kg
V2i = 1.85 m/s
(m²
2m²)V₂i = [?] m/s
m₁ + m2
m₁ + m2
Remember: right is +, left is -.
The speed of car A after the collision is 0.52 m/s.
What is speed?In everyday use and kinematics, the speed of object is the amount of change in position over time, or the amount of change in position per unit time. So it's a scalar quantity.
For a bumper car A
Mass (m₁) = 296 kg
Velocity (V₁) = 3.74 m/s,
For a bumper car B
Mass (m₂) = 222 kg
Velocity (V₂) = 1.85 m/s,
To calculate velocity of car A after the collision mathematically:
Vₙ =(m₁-m₂/m₁+m₂)V₁
Vₙ = Final velocity of car A
Vₙ = (296 - 222/296 + 222) × 3.74
Vₙ = 0.52 m/s
Hence, the velocity of car A after the collision
Vₙ = 0.52 m/s
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about the atmospheric winds at different heights on the giant planets, which one of the following statements is not correct?
"Saturn has the strongest magnetic field among all planets in our solar system," statement is incorrect.
What is a magnetic field?A magnetic field, a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials. When a charge moves through a magnetic field, a force that is perpendicular to both its own velocity and the magnetic field operates on it.
The magnetosphere, a massive magnetic bubble formed by forces deep inside Saturn, has a significant impact on the space environment close to the planet. Deep within the planet's fluid innards, material cycles produce Saturn's magnetic field.
The solar wind, or flow of electrically charged solar particles (electrons and ions), travels across the solar system at a million miles per hour beyond Saturn's magnetosphere. The magnetosphere of Saturn develops when the solar wind collides with its own magnetic field. The magnetic forces of the sun are strongest outside the planet's magnetosphere, while Saturn's magnetic fields are strongest inside the planet's protective envelope.
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Observations suggest that Pluto is covered with icy frost and has a moderately high albedo (0.5). What is
Pluto’s brightness (at the average opposition) relative to the sun if Pluto’s radius is 1120 km?
Pluto’s brightness relative to the sun is 4.46×10^-7 if Pluto’s radius is 1120 km.
What is albedo?
Albedo, which ranges from 0 (a black body that absorbs all incident radiation) to 1, (a body that reflects all incident radiation), is a measurement of the diffuse reflection of solar radiation out of the total solar radiation.
Given that albedo of Pluto = 0.5.
Pluto’s radius: R = 1120 km.
Hence, Pluto’s brightness relative to the sun = albedo /(radius)²
= 0.5/(1120×10^3)
= 4.46×10^-7.
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A catcher catches a baseball (m = 145 g) traveling at a speed of 42.5 m/s. How much work was done on the baseball to bring it to rest?
The net work done on the baseball to bring it to rest is -130.953 J or approximately 131 J. The negative sign indicates that the force has been applied opposite to the direction of motion of the baseball.
What is the work-kinetic energy theorem ?The work-kinetic energy theorem states that an object's change in kinetic energy is equivalent to the work that has been done on it.
[tex]W_{net} = KE_{f} -KE_{i}[/tex]
Here,
[tex]W_{net}[/tex] = Net work done
[tex]KE_{f}[/tex] = Final Kinetic Energy
[tex]KE_{i}[/tex] = Initial Kinetic Energy
We know,
[tex]KE = \frac{1}{2} mv^{2}[/tex]
Here, m = Mass of the object
v = velocity of the object
Now,
[tex]W_{net} = KE_{f} -KE_{i}\\W_{net}= \frac{1}{2} mv^{2}_{f} - \frac{1}{2} mv^{2}_{i}[/tex]
Given,
Mass of baseball (m) = 145g = 0.145 kg
Initial velocity ([tex]v_{i}[/tex]) = 42.5 m/s
Final velocity ([tex]v_{f}[/tex]) = 0 m/s (since, the baseball comes to rest.)
Inserting these values in the above equation we get,
[tex]W_{net}= \frac{1}{2} mv^{2}_{f} - \frac{1}{2} mv^{2}_{i}\\ = 0- \frac{1}{2} *0.145*42.5*42.5 \\= -130.953[/tex]
Hence, the net work done on the baseball to bring it to rest is -130.953 J or approximately 131 J.
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The pendulum was released from point A with (MECHANICAL ENERGY) ME = 10J. No Friction is present. What will be the approximate value of velocity at point M if the mass of the pendulum is 0.1 kg
The approximate value of velocity at point M will be 15 m/s if the mass of the pendulum is 0.1 kg.
What is mechanical energy?
The energy that an object possesses as a result of its motion or position is known as mechanical energy. Kinetic energy, or the energy of motion, and potential energy are two types of mechanical energy (stored energy of position).
According to the question, total mechanical energy of the pendulum at point A = 10 J.
Let the velocity of the pendulum at point M be v.
Then
kinetic energy at point M = total mechanical energy at point A
⇒ 1/2 × 0.1 × v² = 10
⇒ v² = 200
⇒ v = 10√2 = 15 (approx.)
Hence, the approximate value of velocity at point M will be 15 m/s.
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about two thirds of the nearby spiral galaxies (which we can study in more detail) don't have a round central bulge, but instead show
About two-thirds of the nearest spiral galaxies display a central bulge with a bar of stars in the middle rather than a circular central bulge.
What is Spiral Galaxies?
The twisted clusters of stars and gas known as spiral galaxies, which are frequently formed of hot, young stars, have striking shapes. As opposed to the other two major groups of galaxy forms, elliptical and irregular, spiral galaxies make up the majority of the galaxies that astronomers have so far discovered.
A spiral galaxy is one that contains Earth and our solar system, such as the Milky Way.
The majority of spiral galaxies have a flat, spinning disc of stars around a central bulge. Older, fainter stars make up the bulge in the centre, which is thought to house a supermassive black hole. A bar structure runs through the core of almost two-thirds of spiral galaxies, including the Milky Way.
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Find the depth in a lake at which the pressure is 173.693 lb/in2.
The depth in the lake of pressure 173.693 lb/in² is 122.45 m.
What is depth?Depth is the distance down either from the top of something to the bottom, or to a distance below the top surface of something.
To calculate the depth in the lake, we use the formula below.
Formula:
h = P/gD........................ Equation 1Where:
h = Depth in the lakeP = Pressure D = Density of waterg = Acceleration due to gravityFrom the question,
Given:
P = 173.693 lb/in² = 1.2×10⁶ N/m²g = 9.8 m/s²D = 1000 kg/m³Substitute these values in to equation 1
h = (1.2×10⁶)/(9.8×1000)h = 122.45 mHence, the depth in the lake is 122.45 m.
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which of the following would be included in a neutral posture
answer: A
The correct answer choice which is correct about the description of a neutral posture from above is: A boy sitting on an examination chair whose knees are at the same height.
The correct answer choice is option a.
What is meant by neutral posture?Neutral posture can simply be defined as that position which an individual is that he or she finds comfort in and that can be in that position for a prolonged time. However, the part of the mammalian brain which controls our body postures is known as what we call the cerebellum.
From the context of the task, the body is sitting on a chair with his two knees at the same height is a neutral posture because he will be eased and comfortable to be in this position for a long while.
So therefore, we can now deduce from all said and done above that good posture helps us to maintain balance.
Complete question:
Which of the following would be included in a neutral posture:
a. A boy sitting on an examination chair whose knees are at the same height
b. An examiner sitting on a chair whose knees are at heights far above each other apart
c. A man standing on the stairs whose elbows are lifted upward for long
d. None of the above.
Read more on neutral posture:
https://brainly.com/question/1957743
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