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Physical QUANTITY is EXPRESSED in terms of numerical VALUE and unit. The magnitude of a physical quantity is expressed as, Physical quantity = (numerical value) × (unit)

u= -30 cm f= -20 cm By USING mirror formula, 1/v + 1/u = 1/f 1/v + 1/-30 = 1/-20 v= -60 cm negative sign indicates that image is in front of the mirror THEREFORE, The DISTANCE between image and object = 60–30 = 30CM

Power RATING of fan = 40 WExplanation:Moment of Inertia I = 2 kg m²As fan starts from rest and attains max frequencyInitial angular velo ω₀ = 0Final angular velo  ω = 2πN/60 = 2π x 60/60 = 2π rad /sAngular accln α = (ω - ω₀) / t = 2π/2 = π rad/s²Maximum TORQUE τ = I α = 2 x π = 2π N mPower rating = Pmax = Torque x angular velo                                    = τω                                    = 2π x 2π                                    = 4 x π²                                    = 4 x 3.14 x 3.14                                    = 39.43                                    = 40 W

Sampling is a process used in statistical analysis in which a predetermined number of observations are taken from a larger POPULATION. The methodology used to sample from a larger population depends on the TYPE of analysis being performed, but it may INCLUDE simple random sampling or SYSTEMATIC sampling.

if volume and temperature are held CONSTANT, the ideal gas equation can be rearranged to SHOW that the pressure of a SAMPLE gas is directly proportional to the number of MOLES of gas present:Explanation:P-n (RTV)-nx CONST.

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Complete answer:We know that every measurement we make is made about a unit like a length is in meters and volume is in liters, similarly, time is also measured in seconds. For this measurement, the value of 1 second of time should always be the same no matter in which country or universe you are measuring it in.Scientists used various ways to keep the value of 1 second constant from using mechanical PENDULUMS to using quartz crystal-based CLOCKS, but all of them would slowly show errors.To eliminate all such errors in 1967, the international standard for the length of one second came to life. According to this NEW international standard 1 second is equal to 9192631770 cycles (or period) of the radiation that gets an atom of Cesium to vibrate between TWO energy states.In simple words when exposed to certain frequencies of radiation (usually radio waves) the electrons in an atom will start to jump between energy states. 1 second is equal to the time in which the electrons in a cesium atom jump 9192631770 times between different energy states when radio waves are used on cesium atoms.Hence, 1 second is equal to 9192631770 periods of the cesium clock

tion:112 is a common emergency number that can be DIALED for (AMBULANCE, fire and RESCUE, POLICE).

Relative permittivities of some materials at room temperature under 1 kHzExplanation:The relative permittivity of a MEDIUM is related to its electric SUSCEPTIBILITY, χe, as εr(ω) = 1 + χe. In ANISOTROPIC media (such as non cubic CRYSTALS) the relative permittivity is a second rank tensor. The relative permittivity of a MATERIAL for a frequency of zero is known as its static relative permittivityThank You

The ACCEPTED VALUE for the RADIUS of the Earth is around 6.38 x 106 METERS

tion:1. ACCELERATION2. yes, if the object is at rest3. UCM is the motion of an object if it moves on circular path with constant angular rate of rotation Or with constant speed4. It helps to prevent injury in the case of a car crash by decreasing the velocity of a body as it undergoes a sudden reduction in speed i. e. inerta of motionA seatbelt expands the stopping force required to decelerate the rider across their body. This stops the body from hitting the STEERING column or windshield of a high-speed car, which could easily result in injury or even death.The belt is DESIGNED to apply most of the stopping force required to the rib cage and pelvis both of which are relatively robust.5.when the object was changing POSITION at a constant velocity, the acceleration was 0. This is because the object is no longer changing its velocity and is moving at a constant rate

tion:Since 24x is a multiple of 3, its SUM of digits6+xis a multiple OF3; So,6+xis one of these numbers:0,3,6,9,13,15,18,…. Sincexis a digit, it can only be that6+x=6or9or12or15. Therefore,x=0or 3 or 6 or 9 . Thus, x can have any of four different values.what is SCIENCEI HOPE its help you mark as brainlist PLZ ok bhai

N:-A hammer of mass 1kg FALLS freely from a height of 20m. Calculate velocity and kinetic ENERGY​ EXPLANATION:-Let's calculate it's velocityUsing 3rd equation of motion:-So here h(height)=20 mg=9.8 ms²Let's apply thee GIVEN data in the formula to calculate final velocitySo the Velocity of the hammer  is =17.79 m SNOW let's calculate it's kinetic energy.Mass of body=1 kgVelocity of body=17.79 m s Hence the kinetic energy of the hammer=158.24 j

25 m/s for 100m in 4 sec and 25 m/s for 50m in 2 secExplanation:                                                                 Average SPEED = TOTAL distance / total timeAage tum khud kro bro ITNA easy question nahi kr pa RHE HO !!!  HINT DE DIYA MAINE

tion:N cells each of emf & and internal resistancecurrent through an EXTERNALRESISTANCE RIN seriesSend the sameWhether the cells are CONNECTED (or) in panallel ThenThen R=

Relying on the VARIATIONAL principle, it is proved that new contradictions EMERGE from an analysis of the LAGRANGIAN density of the Klein-Gordon field: NORMALIZATION problems ARISE and interaction with external electromagnetic fields cannot take place..hope it will help you mark my answer brainliest please

this is the ANSWER for UR QUESTION

Isn't it?EXPLANATION:that's the QUESTION TAGG

this is your ANSWER 1790m/s

To make your own BATTERY at home, all you need is two different types of METAL, some copper WIRES, and a conductive material. Many HOUSEHOLD items can be used as the conductive material into which you place your metals — for example, saltwater, a lemon, or even dirt.Explanation:I hope this will help Plz make me brainliest

आपतित किरण, अपवर्तित किरण तथा अभिलाब, दोनों पारदर्शक माध्यमों के पृथक्क़रण तल में आपतन बिंदु पर सभी एक ही तल में होते हैं। (II) प्रकाश के किसी दिए गए रंग के लिए तथा माध्यमों के युग्म के लिए आपतन कोण की जय तथा अपवर्तन कोण की ज्या का अनुपात एक स्थिरांक होता है। इस नियम को स्नेल अपवर्तन का नियम कहते हैं।

Differences between convex and concave mirror in terms of characteristics of images..BASICALLY, the reflecting SURFACE of convex mirror bulges outside while concave mirror's bulges inwards. The major difference is the image that forms in these TWO mirrors. In other words, DIMINISHED images form in convex mirrors while enlarged images form in concave mirrors.hope it helpsconsider making my answer as BRAINLIST

The TWO VALUES shown by the teachers are:=] The teachers are saving fuel and showing a way to save fuel.=] The teachers are indirectly TEACHING their students about the ways to save fuel.The Two advantages of Carpool are:=] More fuel can be saved.=] Pollution can be decreased.Please mark the answer as BRAINLIEST if you like the answer

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The DEFINITION of a regular shape is that all the SIDES are EQUAL and all the inside angles are equal. An irregular shape doesn't have equal sides or equal angles. For example, an equilateral triangle is a regular shape because all the sides are equal AND all the angles are equal.

re, the ELECTRIC potential due to an electric dipole at a given point is equal to KPcosθr2−a2cos2θ. Special cases: (i) When the given point is on the AXIAL LINE of the dipole (i.e. θ=0).

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An ALPHA - particle is the nucleus of a HELIUM ATOM. It has a MASS m = 6.64 × 10^-27 kg and a charge q = + 2E = 3.2 × 10^_10

the electric field DUE to a DIPOLE, at a given point on its axial line is {→E=2kr3→P}.

R=√A^2+B^2+2ABcos©20^2=10^2+10^2+2×10×10×cos©400=100+100+200×cos©400-200=200cos©200/200=cos©1=cos©©=0therefore these TWO VECTORS are PARALLEL to each other

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A short wire has less RESISTANCE whereas a long wire has more resistance and a thick wire has less resistance whereas a thin wire has more resistance. GREATER the MAGNITUDE of current passed through a given wire, greater will be the heat produced in it. (Resistance = rho x length /AREA)