Explore topic-wise InterviewSolutions in .

The phenomenon of "weightlessness" occurs when there is no force of support on your body. When your body is effectively in "free fall", accelerating downward at the acceleration of gravity then you are not being supported.

Without gravity,satelliteswould not be able to orbit around the earth and would simply move in straight line into space. Thereasonwhy astronauts feelweightlessis because they are accelerating toward the earth at the same rate as the vehicle they are in.

plzzz send option

(a) Zero reaction force by satellite surface.

The state of motion of an object is defined by its velocity - the speed with a direction. Thus, inertia could be redefined as follows: Inertia: tendency of an object to resist changes in its velocity. An object at rest has zero velocity - and (in the absence of an unbalanced force) will remain with a zero velocity.

Pure air is free from germs and harmful gases. It contains 78% nitrogen, 21% oxygen and small amount of other gases and dust particles.Polluted air contains harmful gases and unwanted substances.

Weightlessness

The concept ofweightlessnessis one that is easily misunderstood by most people until they have been exposed to introductory physics for the first time. For example, many of us learn early on (correctly) that weight depends on force of gravityFg=mg, and that we weigh more on earth than on the moon because the strength of gravity on earth (g=9.8 m/s2) is greater than that of the moon (g=1.6 m/s2). It's no surprise, then, that one common misconception is that an object becomes weightless when the force of gravity becomes equal to zero. Strictly speaking, this statement would be true if not for the fact that the force of gravity can never be exactly equal to zero (see thelesson on gravitationfor more details about the formula for the force of gravity). This is because gravity has an effect even over incredibly long distances, despite the fact that it is the weakest of the fundamental forces.

Examples :

Astronauts on the International Space Station experience onlymicrogravityand thus display anexample of weightlessness. ... The block is said to be in a state ofweightlessnessalthough being pulled down by the planet's gravity.

1 Heating effect2 Magnetic effect

1. Heating effect of eletric current.

2. Magnetic effect of electric current.

Let acceleration of lift be a.

acceleration of ball with respect to the lift = acceleration of ball with respesct to ground - acceleration of the lift

Or, aball(lift)= g - a = 9.8 m/s^2 - a = 32 ft./s^2- a[ 9.8m = 32 ft. ]

displacement s = 6 ft.

time taken t = 1 s.

initial velocity u = 0

s = ut + 1/2 at^2 = 0*1 + 1/2 (32-a)*1*1 = 1/2 (32-a)

Therefore, 6 = 1/2 (32-a)

Hence a = 20 ft./s^2

Thank you

Motion: - An object is said to be inmotionwhen it changes it's position with time , with reference to its immediate surroundings. ...Non - uniform motion: - An object is said to be innon - uniform motionwhen itdoesnot move along a straight path and covers equal distances in unequal intervals of time.

h=20mg=10m/s^2u=0v^2-u^2 = 2ghv^2-0=2*10*20v = 20 m/s^2

h=20m

g=10m/s^2

u=0

v^2-u^2 = 2gh

v^2-0=2*10*20

v = 20 m/s^2

A displacement is a vector whose length is the shortest distance from the initial to the final position of a point P. It quantifies both the distance and direction of an imaginary motion along a straight line from the initial position to the final position of the point.

The velocity of an object is the rate of change of its position with respect to a frame of reference, and is a function of time. Velocity is equivalent to a specification of an object's speed and direction of motion

In physics,accelerationis the rate of change of velocity of an object with respect to time. An object'saccelerationis the net result of all forces acting on the object, as described by Newton's Second Law. The SI unit foraccelerationis metre per second squared (m⋅s−2).

Displacement(symbolized d or s ), alsocalledlength or distance, is a one-dimensional quantity representing the separation between two defined points. The standard unit ofdisplacementin the International System of Units ( SI ) is the meter (m).Displacementis usually measured or defined along a straight line.

Velocityis a measure of how fast something moves in a particular direction. In other words, avelocityis a speed with a direction. For instance, if an object moves east at 9 metres per second (9m/s), we would say that itsvelocityis 9 m/s to the east.

accelerationis the rate of change of velocity of an object with respect to time. An object'saccelerationis the net result of all forces acting on the object, as described by Newton's Second Law. The SI unit foraccelerationis metre per second squared (m⋅s−2).

Uniform circular motion can be described as the motion of an object in a circle at a constant speed. As an object moves in a circle, it is constantly changing its direction. At all instances, the object is moving tangent to the circle. Since the direction of the velocity vector is the same as the direction of the object's motion, the velocity vector is directed tangent to the circle as well.

move equal and equal interval of time known as uniform motion

Definition: Thistype of motionis defined as themotionof an object in which the object travels in a straight line and its velocity remains constant along that line as it covers equal distances in equal intervals of time, irrespective of the duration of the time.

Uniform motionis defined as themotionof an object in which the object travels in a straight line and its velocity remains constant along that line as it covers equal distances in equal intervals of time, irrespective of the length of the time

v(dv/ds)=a

ds/dt=v

dv/dt=a

These formula are extremely important and Any question regarding uniform or non -uniform motion can be solved using them. If you are helpless and remember nothing, just use them correctly. For example, if we have a as a function of t (say, a = 5t), replace a with one of the formula given above. Simplify and integrate taking proper limits according to the demands made by the questioner.

Thankx

I did not understand that why if you would like to then you can make understand me so please and immediately

it is because the terms in which these quantities are measured are the same i.e cm..had this been related to area where it is measured in terms of cm^2 the answer would have been different

iron oxide with small amounts of K2O and Al2O3 is the correct answer

The catalyst used is FeO.

the catalyst used is Feo is the right answer of following questions

feo is the right answer

option 2

what is your question

Given the position vector is in +i direction.

And the acceleration vector is (-1/√2i +1/√2j)

so, the i component of acceleration vectors that is (-1/√2) is parallel to the position vector. so, it is aT

and the j component is perpendicular to the position vector, so this is aR

so, the ratio is of magnitude of aR/aT = |-1/√2/(1/√2)| = 1.

option C .

are u using whatsap

The path equation is y = x^2

Sx= x = ∫vx.dt =3∫dt = 3t

Sy= y =∫vy.dt =∫6x dt =∫6(3t) dt =∫18tdt = 9t2

Thusy = x^2

diamond have maximum refractive index

your question answer is diamond

diamond is the correct answer

option (d)

thank you

The density of water is maximum at 4°C

Please hit the like button if this helped you