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ANSWERsurface AREA of sphereA=4πr 2 a=4×3.14×(2.1) 2 =55.4cm 2 A=4πr 2 A=4×3.14×(2.1) 2 =55.4cm 2 \\ AΔA =2× rΔr ΔA=2× rΔr ×A =2× 2.10.5 ×55.4=26.4cm 2 SURFACE area =(55.4±26.4)CM 2

kg/cm^3OTHER TWO ARE COMMONLY USED UNITS FOR DENSITY BUT GENERALLY WE DOESNOT USE kg/cm^3

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helloheating effect produced by an electric current, I through a CONDUCTOR of RESISTANCE, R for a time, t is given by H = I2Rt. This equation is called the Joule's equation of ELECTRICAL heating. b)The resistance of the filament used in the bulb. A 2.5 kW immersion heater is used to heat water.Explanation:Introduction When current flows through a conductor, heat energy is generated in the conductor. The heating effect of an electric current depends on three factors: The resistance, R of the conductor. A higher resistance produces more heat. The time, t for which current flows. The LONGER the time the larger the amount of heat produced The amount of current, I. the higher the current the larger the amount of heat generated. Hence the heating effect produced by an electric current, I through a conductor of resistance, R for a time, t is given by H = I2Rt. This equation is called the Joule’s equation of electrical heating. Electrical energy and power The work done in pushing a charge round an electrical circuit is given by w.d = VIt So that power, P = w.d /t = VI The electrical power consumed by an electrical appliance is given by P = VI = I2R = V2/R Example An electrical bulb is labeled 100W, 240V. Calculate: a)The current through the filament when the bulb WORKS normally b)The resistance of the filament used in the bulb. Solution I = P/V = 100/240 = 0.4167A R = P/I2 = 100/ 0.41672 = 576.04Ω or R = V2/P =2402/100 = 576Ωhope it helped youplz make me brainliest

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within 5 second the body will acquired a speed of 1 cm per secExplanation: it is so as the body's ACCELERATION is 2cm per 2 second that means within ONE SEC the body accelerate by 1 centimetre and so within 5 sec the body will accelerate by 5+5 = 10 cm per sec

helloExplanation:If the object travels in a uniform SPEED in a circular path is called centripetal FORCE. The object has the DIRECTION along the centre of the circle from the object approaching the centre. Mud flying of a tire is one example of the centrifugal force. A satellite orbiting a planet is an example of the centripetal force.please make me brainliest

then, n is KNOWN as ORDER of MAGNITUDE. here we have to find out order of magnitude of 2^20. so, 6 is order of magnitude of 2^20.

any AMOUNT of CURRENT over 10 MILLIAMPS (0.01 AMP) is capable of producing painful to severe shock, currents between 100 and 200 mA (0.1 to 0.2 amp) are lethal.

HelloExplanation:ICE is OPTICALLY denserPlease MAKE me BRAINLIEST

be LIFTED (F.L) =150 NEffort REQUIRED (F.E). =60NMachenical ADVANTAGE= => => 2.5

3kmExplanation:speed=distance/timedistance=speed*timespeed=6km/htime=30min or 1/2hr∴Distance=6*1/2                  =3kmHOPE IT HELPS......

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Normal is perpendicular DRAWN to the surface at the point of INCIDENCE so that angle between INCIDENT RAY and normal is angle of incidence.

pls mark brainliestRest and MOTION are the relative terms because they DEPEND on the observer's FRAME of reference. ... So if two DIFFERENT observers are not at rest with respect to each other, then they too get different RESULTS when they observe the motion or rest of a body

Principal axis: It’s an IMAGINARY line passing through the OPTICAL centre and the centre of curvature of any lens or a spherical mirror.Radius of Curvature (r): It’s the LINEAR distance between POLE and the Center of curvature. Pole (p) : It’s the MIDPOINT of the spherical mirror. Radius of Curvature (r): It’s the linear distance between Pole and the Center of curvature.

Mass of ELEPHANT (m) = 600 kgDiameter of each foot (d) = 0.4 mTo Find :Stress on the SURFACE of each foot Solution :Diameter of each foot of elephant is 0.4 m. So, we gave to find radius of foot. ______________________________________________________This is stress of all the four legs.So,stress of ONE leg will be :

re two possibilities in which the resistors can be connected1) Series Net RESISTANCE Rs =R 1+ R 2 Rs =15 ohmVoltage of the BATTERY =25V Current flowing through the combinationI = V /Rs I =25/15I=1.6 ohmwe know that in series COMBINATION the current flowing through both the resistors is the sameI 1= I 2 = 1.6 A2) ParallelR 1 and R2 are connected in parallelNet resistanceRp =R 1×R 2/ R 1+ R 2Rp=25×15/40Rp=9.37 ohmsVoltage of the battery=25 V Current flowing through the parallel combinationI = V /RP =25/9.37I=2.66AIn parallel combination we know that the voltage across both the resistors is the sameI 1 = V /R 1 = 25/25 =1 AI 2 = V / R 2 =25 /15 =1.66 A

hole is a region of spacetime where gravity is so strong that nothing—no particles or even electromagnetic RADIATION such as light—can escape from it.[6] The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole.[7][8] The boundary of the region from which no escape is possible is called the event horizon. Although the event horizon has an enormous effect on the fate and circumstances of an object crossing it, it has no LOCALLY detectable features.[9] In many ways, a black hole acts like an ideal black body, as it reflects no light.[10][11] Moreover, quantum field theory in curved spacetime predicts that event horizons EMIT Hawking radiation, with the same spectrum as a black body of a temperature inversely proportional to its mass. This temperature is on the order of billionths of a kelvin for black holes of stellar mass, making it essentially impossible to observe.Objects whose gravitational fields are too strong for light to escape were first considered in the 18th century by John Michell and Pierre-Simon Laplace.[12] The first modern solution of general relativity that would characterize a black hole was found by Karl Schwarzschild in 1916, although its interpretation as a region of space from which nothing can escape was first published by David Finkelstein in 1958. Black holes were long considered a mathematical curiosity; it was not until the 1960s that theoretical work showed they were a generic prediction of general relativity. The discovery of neutron stars by Jocelyn Bell Burnell in 1967 sparked interest in gravitationally collapsed compact objects as a possible astrophysical reality.Black holes of stellar mass are expected to form when very massive stars collapse at the end of their life cycle. After a black hole has formed, it can continue to grow by absorbing mass from its surroundings. By absorbing other stars and merging with other black holes, supermassive black holes of millions of solar masses (M☉) may form. There is consensus that supermassive black holes exist in the centers of most galaxies.The presence of a black hole can be inferred through its interaction with other matter and with electromagnetic radiation such as visible light. Matter that falls onto a black hole can form an external accretion disk heated by FRICTION, forming quasars, some of the brightest objects in the universe. Stars passing too close to a supermassive black hole can be shred into streamers that shine very brightly before being "swallowed."[13] If there are other stars orbiting a black hole, their orbits can be used to determine the black hole's mass and location. Such observations can be used to exclude possible ALTERNATIVES such as neutron stars. In this way, astronomers have identified numerous stellar black hole candidates in binary systems, and established that the radio source known as Sagittarius A*, at the core of the Milky Way galaxy, contains a supermassive black hole of about 4.3 million solar masses.On 11 February 2016, the LIGO Scientific Collaboration and the Virgo collaboration announced the first direct detection of gravitational waves, which also represented the first observation of a black hole merger.[14] As of December 2018, eleven gravitational wave events have been observed that originated from ten merging black holes (along with one binary neutron star merger).[15][16] On 10 April 2019, the first ever direct image of a black hole and its vicinity was published, following observations made by the Event Horizon Telescope in 2017 of the supermassive black hole in Messier 87's galactic centre.[3][Explanation:hope this helps you it has each and every information about the black holepls rate the answer five starpls mark the answer as brainliest pls do the above thing if the answer was helpful

-15cm F2 = 30cmI hope it will HELP youPlease MARK me as BRAINLIEST

tractive at all DISTANCE

the ANSWER is 22.5 m.......

The LAW that for any circuit the ELECTRIC CURRENT is directly proportional to the voltage and is inversely proportional to the RESISTANCE.

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velocity (u) = 0 m/s. --(At rest) Distance travelled (s) = 400mTime TAKEN (t) = 20sMass (m) = 7000 kgAcceleration (a) Force (F) Now, On using 2nd EQUATION of motion, we GET, ➦ s = UT +1/2 at²➭ 400 = 0×20 + 1/2a × (20)²➭ 400 = a/2 × 400➭ 400 = 400a/2➭ 400 = 200a➭ a = 400/200➭ a = 2m/s²Hence, Acceleration (a) = 2 m/s²Now, We know that, ➦ Force = Mass × Acceleration ➦ F = m × aOn putting above values in it, we get, ➭ F = 7000 × 2➭ F = 14000 NHence, Force(F) = 14000 Newtons

it MAY 5m/sechope you not DISAPPOINTED

upload the answer but please TELL me in the comments. Is the position x = 6 ( t – E – 21 )GIVEN in the QUESTION correct ?

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bject is an expression USED in kinematics: it is an object WHOSE dimensions are ignored or neglected while CONSIDERING its motion. A point object refers to a tiny object which is calculated or counted as DOT object to simplyfy the CALCULATIONS. A real object can rotate as it moves.

rved shape image is produced because the RAYS of light REFLECTING from the surface do not meet at a single POINT of focus but are spread over a focal plane. ... These can produce very FUNNY RESULTS as the image of the body is distorted!