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-रूही 300 km दूरी पर स्थित अपने घर जाने के लिए कुछ दूरी रेलगाड़ी द्वारा तथा कुछ दूरी बस द्वारा तय करती है । यदि वह 60 km रेलगाड़ी द्वारा तथा शेष बस द्वारा यात्रा करती है तो उसे 4 घंटे लगते हैं । यदि वह 100 km रेलगाड़ी से तथा शेष बस से यात्रा करे , तो उसे 10 मिनट अधिक लगते हैं ।To find : -रेलगाड़ी एवं बस की क्रमशः चाल ज्ञात कीजिए । Solution : - माना रेलगाड़ी की चाल = u kmh पहली स्थिति में , ..........( i ) दूसरी स्थिति में , ..........( II ) 60p + 240q = 4 . . . ( iii ) 100p + 200p = . . . ( iv ) और 60p + 240p - 4 = 0 ......( V) 600p + 1200p - 25 = 0 . . . ( VI ) विलोपन विधि का प्रयोग करके समीकरण ( iii ) को ' 10 ' से गुणा करने पर 600p + 2400q - 40 = 0 . . . . ( vii ) समीकरण ( iv ) को ( v ) में रखने पर 1200q = 15 1200q = 15 Q = q = इस मान को समीकरण ( v ) में रखने पर p = परंतु p = और q = और u = 60 और v = 80

focuscentre of curvaturepolemirrorray of lightangle of INCIDENCEANGLE of reflectionangle or REFRACTION

ry muscles of our BODY get fatigue easily. Mostly the muscles present in our arms, legs and thighs get exhausted QUICKLY as these PARTS are moved and used maximum.pls FOLLOW me and mark me BRAINLEST pls pls pls

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at is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and SPACING of the particles DETERMINES the state of matter of the substance. ... SOLIDS, liquids and gases all expand when heat is added. PL bna de merko Brainly

2.5m/s∧2  Explanation:  If the x- axis is time then CHANGE in SPEED = 100-50  Δt= 20 acceleration= Δv÷Δt HENCE= 50÷20 =2.5m/s²

tion:As Soon As PossibleThe Meaning of ASAPASAP means "As Soon As POSSIBLE" So now you know - ASAP means "As Soon As Possible" - don't thank US. YW! What does ASAP MEAN? ASAP is an acronym, abbreviation or slang word that is EXPLAINED above where the ASAP DEFINITION is given.

as BRAINLIST Because we observe BUOYANCY in water means upward forceWhen we are dead our BODY GET relaxed and there is no MOTION so our body starts floating

tion:There are two types of ANIMAL MANURE which are farmyard manure or farm slurry. Farmyard manure consists of plants materials as bedding for animals which has absorbed faeces and urine. In slurry, INSTEAD of bedding CONCRETE or SLATS are used.

HELLO....☺BRO/SIS.......❤❣️❤THIS IS YOUR ANSWER........✔♡✔The FOCAL length of a lens is depended on the SURROUNDING medium. The reason BEHIND this phenomenon is that the angle of refraction of a lens is depended on the indices of refraction of the medium of lens and the incoming medium and the difference in their indices.✧༺♥༻✧✧༺♥༻✧✧༺♥༻✧♡☺♡♡HOPE THIS WILL HELP YOU MATE...✔FOLLOW US GET FOLLOW BACK...✔✍️✔.TAKE CARE.❤☺✔♡♡❣️♡♡✔☺❤BE HAPPY ALWAYS ....☺✔☺✧✧✧✧✧✧✧✧✧✧✧✧✧✧✧✧✧꧁༒☬ℜ؏αᏞ_ᏦηGs☬༒꧂✌

pthrust is 20N and weight of body in water is 400Ntherefore, by the CONCEPT of UPTHRUST weight of the body in air = 400N - 20N = 380N is UR answer..plz mark me as brainliest....

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mass of twenty 1 rupee COIN = 198 grammass of ONE coin = 198 divided by 20= 9.9 gram.please mark me as brainliestExp lanation:

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tion:common Physics lab is to sight through the long side of an isosceles TRIANGLE at a pin or other object held behind the opposite face. When done so, an unusual observation - a discrepant event - is observed. The diagram on the left below depicts the physical situation. A ray of light entered the face of the triangular block at a right angle to the boundary. This ray of light PASSES across the boundary without refraction since it was incident along the normal (recall the If I Were An Archer Fish page). The ray of light then travels in a straight line through the glass until it reaches the second boundary. Now instead of transmitting across this boundary, all of the light SEEMS to reflect off the boundary and transmit out the opposite face of the isosceles triangle. This discrepant event bothers many as they spend several minutes looking for the light to refract through the second boundary. Then finally, to their amazement, they looked through the third face of the block and clearly see the ray. What happened? Why did light not refract through the second face?The phenomenon observed in this part of the lab is known as total internal reflection. Total internal reflection, or TIR as it is intimately called, is the reflection of the total amount of incident light at the boundary between two media. TIR is the topic of focus in Lesson 3.To understand total internal reflection, we will begin with a thought experiment. Suppose that a laser beam is submerged in a tank of water (don't do this at home) and pointed upwards towards water-air boundary. Then suppose that the angle at which the beam is directed upwards is slowly altered, beginning with small angles of incidence and proceeding towards LARGER and larger angles of incidence. What would be observed in such an experiment? If we understand the principles of boundary behavior, we would expect that we would observe both reflection and refraction. And indeed, that is what is observed (MOSTLY). But that's not the only observation that we could make. We would also observe that the intensity of the reflected and refracted rays do not remain constant. At angle of incidence close to 0 degrees, most of the light energy is transmitted across the boundary and very little of it is reflected. As the angle is increased to greater and greater angles, we would begin to observe less refraction and more reflection. That is, as the angle of incidence is increased, the brightness of the refracted ray decreases and the brightness of the reflected ray increases. Finally, we would observe that the angles of the reflection and refraction are not equal. Since the light waves would refract away from the normal (a case of the SFA principle of refraction), the angle of refraction would be greater than the angle of incidence. And if this were the case, the angle of refraction would also be greater than the angle of reflection (since the angles of reflection and incidence are the same). As the angle of incidence is increased, the angle of refraction would eventually reach a 90-degree angle. These principles are depicted in the diagram below.The maximum possible angle of refraction is 90-degrees. If you think about it (a practice that always helps), you recognize that if the angle of refraction were greater than 90 degrees, then the refracted ray would lie on the incident side of the medium - that's just not possible. So in the case of the laser beam in the water, there is some specific value for the angle of incidence (we'll call it the critical angle) that yields an angle of refraction of 90-degrees. This particular value for the angle of incidence could be calculated using Snell's Law (ni = 1.33, nr = 1.000, = 90 degrees, = ???) and would be found to be 48.6 degrees. Any angle of incidence that is greater than 48.6 degrees would not result in refraction. Instead, when the angles of incidence is greater than 48.6 degrees (the critical angle), all of the energy (the total energy) carried by the incident wave to the boundary stays within the water (internal to the original medium) and undergoes reflection off the boundary. When this happens, total internal reflection occurs.

Hi dear!!☺️☺️● In GEOMETRIC optics, the paraxial APPROXIMATION is a small-angle approximation used in Gaussian optics and ray TRACING of LIGHT through an optical system.Hope it helps ❤️❤️❤️❤️

ans39) ELECTRIC potential due to an electric dipole is zero at every point on the equatorial LINE of the dipole.ans24)The electric field INTENSITY at a point inside a sphere is 0. The charge is distributed on the SURFACE of the sphere no charge is enclosed ,so charge is 0 . according to gauss THEOREM, there will be no flux then there is no electric field intensity.this is the answer please mark as brainliest

The field value at the centre of the RING is zero. The field value is MAXIMUM at l = r/√2 on both sides of the ring. As l tends to infinity the field value APPROACHES to zero. ( it can HELP you and plz follow me)

e Broglie WAVELENGTH λ=1.23 x 10−9m . If a CHARGE of 1 Coulomb is MOVED through a potential difference of 1 Volt then 1 Joule of WORK is done. This is how the Volt is defined.

rticles do not have ENOUGH kinetic energy to overcome the force of attraction between them, matter exists as a solid. The PARTICLES are packed closely together and held rigidly in place. All they can do is vibrate. This explains why solids have a fixed volume and a fixed shaped2.Why the liquids have a definite volume and but no definite shape? Liquid molecules are also packed closely together, but there is enough space between the molecules to allow them to SLIDE past each other. This sliding action PREVENTS the liquid from TAKING a shape of its own.

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tion:The gases can be converted into liquids by BRINGING its PARTICLES closer so ATMOSPHERIC gases can be LIQUEFIED EITHER by decreasing temperature or by increasing pressure.

desnity=45gm/25cm^3=1.8gm/cm^3=1800kg/m^3

the IDENTITY (a+b)^2=a^2+2ab+b^2 geometrically by taking a=3 and b=2R.H.S. = AREA of SQUARE with 3units + area of square with side 2 units + area of RECTANGLE with sides 3,2units+area of rectangle with sides 2,3 units

618.8 nmExplanation:As E=hc/lambdaThus , LAMBDA= hc/ eAs the ENERGY of 3P is more than 3sThusLambda= 6.6×10^-34 × 3×10^8/ 18.7Thus,Lambda = 618.8 NM.

Explanation:An OBJECT was moving north at 10 meters per second. ... An apple is falling down. ... Jane is WALKING east at 3 kilometers per hour. ... TOM was walking east at 3 kilometers per hour. ... Sally was walking east at 3 kilometers per hour. ... ACCELERATION due to gravity.

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n:-The reaction (CONTACT) between the hoop and the ball will be zero at the highest point.....Now,at highest point of circular hoopball will be in VERTICALLY downward ,so the gravitational force mg will be in downward DIRECTION....There will be one another force..i.e centripetal...which is eqaul to mv^2\R....that force will be vertically upward,at TTHE highest point...at the highest point,,as normal force is zero,so we can saymg-mv0^2/R=0V0=(gR)^1/2now,initial veocity=>V0=(gR)^1/2acceleration=gfinal velocity=0so,from first equationv=u+at0=(gR)^/2 +gtg^2t^2=gRt={R/g}^1/2Hence the time after which reaction between hoop and particle is zero is {R/g}^1/2

EMF(E) =RR=(E-V)÷I =(E-V)÷(V÷R) =((E÷V)-1)×RSubstituting the VALUE of EMFR=((R÷V)-1)×RExplanation:

Assertion: An object can have constant speed but variable velocity.Reason:  Speed is a scalar but velocity is a vector quantity.  Explanation:Reason: Speed is a scalar but velocity is a vector quantity. If both assertion and reason are true and reason is the correct explanation of assertion. ... SINCE velocity is a vector quantity, hence as its DIRECTION changes keeping magnitude constant, velocity is said to be changed.I HOPE IT'S HELP YOUAND PLEASE FOLLOW ME ✋️

tion:Electric Field Due To An Electric DIPOLE At A POINT On The AXIAL Line. ... (a) Draw the equipotential surfaces CORRESPONDING to a uniform electric field in the z. PLAY. 3:28 · A short electric dipole ...

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the DIFFERENCE of the magnitude is the magnitude of resultant if two VECTOR have UNEQUAL magnitude Diya difference cannot be zero

The factors that affect the buoyant force are;The DENSITY of the FLUID.The VOLUME of the fluid displaced.The local acceleration due to gravity.Hope it HELPS you.

bject moves in a circle, it is CONSTANTLY CHANGING its direction. ... Accelerating objects are objects which are changing their velocity - either the SPEED (i.e., magnitude of the velocity vector) or the direction. An object undergoing uniform circular motion is moving with a constant speed.

19.6 m (approx)Explanation:initial velocity (u) = 19.6 m/sfinal velocity (v) = 0 m/s [As the BODY stops at a certain HEIGHT]acceleration(a) = -G [Acceleration due to gravity][Acceleration is negative as the object slows down as it is GOING against the gravity]LET the height be sThereforeUsing 3rd equation of motionThereforeHeight = 19.6 m(approx)

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