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erur answer follows....Compound P FORMS enamel of teeth. It is the hardest substance of the body. It does not DISSOLVE in water but it is corroded when pH in the mouth is below 5.5. the substance P iscalcium carbonateCaCO3tooth PASTE prevent DENTAL DECAY as it has basic compounds which makes the medium neutralhope this will help uRegardsDivya^_^

er here is UR answer..YES, The Cause of PERIODICITY of properties of elements is due to the repetition of SIMILAR electronic configuration of their ATOMS in the outermost energy shell after certain period of timefor example•lithium--sodium--potassiumhope it will help uRegardsDivya^_^

y is the odd one out here. Since the REST THREE are scalar QUANTITIES, whereas VELOCITY is a vector quantity.

be SLIDING, STATIC,ROLLING FRICTION

ity corresponding to the amount of magnetic flux emanating from a given magnetic POLE and expressed in TERMS of the UNIT magnetic pole.

this is INSUFFICIENT QUESTIONEXPLANATION:

y of light is DIRECTLY PROPORTIONAL to ANGLE of refractionSo ANS is C

ection of CURRENT

s the CORRECT ANSWER

t of VELOCITY of ball relative to lift areux=4cos30∘=23–√m/sux=4cos⁡30∘=23m/suy=4sin30∘=2m/suy=4sin⁡30∘=2m/sand acceleration of ball relative to lift is a=10+2=12m/s2a=10+2=12m/s2 in NEGATIVE y DIRECTION ACTING downwards.Therefore Time of flight T=2uyaT=2uya=2×212=2×212=13s=13sHence b is the correct answer.

rm rod of mass m and length L is PLACED horizontally on a SMOOTH HORIZONTAL surface.An IMPULSE P is applied at ONE end perpendicular to the length of rod.Find the velocity of centre of mass and angular velocity of rod just after the impulse is applied.

pwhere,p=powerf = focal LENGTH(1)given p= +2f = 1/2=.5m value is positive so lens is convex with focal length 0.5m(2)givenp=-4f= 1/-4= -0.25mvalue is negative so lens is concave of focal length -0.25m. (B(1)We know that=>> givenu= -100cm = -1mf= 0.5m1/v= 1/f +1/u1/v= 1/0.5+ 1/-11/v= 2-11/v=1v=1Image DISTANCE =1m(2)U= -100=-1mf= -0.251/v=1/f +1/u1/v = 1/-0.25 + 1/-11/v = -5v= 1/-5=-0.2Image distance = -0.2m(C) (1st)We know thatMagnificationm= v/u m=1/-1m =-1(2nd)m=v/um= -0.2/-1m= .02

time take to receive ECHO = 8s(v) SPEED of sound in water = 1500m/sdistance of object of the object from submarine = 2d bcoz in sonar the tansmitter FIRSTLY emits the sound wave and then sound reflects back to the ship which is received by transmitter so distance travelled will be 2 times that is 2dv = d/tv×t=2d1500×8=2d120,00/2 =d6000 m = dhence distance travelled is 6000 m

ause they have ultrasonic sound technique Ears HELP them to FIND there WAY as they can feel OBSTACLES in there way

that SLOPE of this GRAPH,SOPLEASE FOLLOW me

oltsR = 1.5 ohmCurrent, I = V/R = 3/1.5 = 2 Amperetime = 1 sCharge = I×t = 2 × 1 = 2 coulombTotal charge FLOWN through the CONDUCTOR in 1 second is 2 Ccharge on 1 ELECTRON = 1.6 × 10^(-19) CNumber of electrons = 2 ÷ (1.6 × 10^(-19)) = 2/1.6 × 10^(19) = 1.25 × 10^(19) Number of electrons passing in 1 second is 1.25×10^(19)

tric MOTOR(2) ELECTRIC generator(3) DOMESTIC circuitAnd in electric generator there is two more i.e AC generator and DC generator

where its k.e would become 49 J is H , then P.E at HEIGHT H = 98-49= 49 J = mgH , so H = 49 / (2*9.8) = 10/4 = 2.5 m

our QUESTION :- A car is moving with velocity = 36 km / hour , then the distance covered by it in one sec = ???Answer :- As given above that velocity = 36 km / hour Then as we know that in one hour thre are 60× 60 = 3600 sec and in 1 km there is 1000 m therefore by converting it into m / sec = = = 10 m/secor it passes 10 metre in one sec Shortcut to find speed in m/s from km/h = multiply speed by Hope it HELPS

oduced is 41800 Joulesexplanation ->R = 100 ohmcurrent (I)= 1Atime (t) = 418secHeat =>  I².R.t      => 1² x (100) x 418 = 41800 JOULES

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also called lead GLANCE, is the natural MINERAL form of lead(II) sulfide. It is the most important ore of lead and an important source of SILVER. Galena is ONE of the most abundant and WIDELY distributed sulfide minerals. It crystallizes in the cubic crystal system often showing octahedral forms.

mirror is also CALLED as focusing mirror Because it makes this a converging mirror and the POINT where the rays converge is called the FOCAL point or focus.Hope this helps you dude ☺️☺️✌️✌️✌️

he FREQUENCY of revolution of the particle is 60r.p.m., i.e., (60÷60)=1 r.p.s.So, n=1.Time period will be the angular velocity will be so, w=2×π×1or, w=2πThus, the linear speed will be v=w×ror, v=2π×2=4π m/sThe centripetal ACCELERATION will be equal to where, by REPLACING the values of m,w,r, one can DEDUCE the value of the centripetal acceleration.So, centripetal acceleration will be 8m(π^2) m/squ. sec

focal length, is positive for a concave MIRROR, and negative for a convex mirror. When the image distance is positive, the image is on the same side of the mirror as theobject, and it is REAL and inverted. When the image distance is negative, the image is behind the mirror, so theimage is virtual and UPRIGHT.

be HELP U..,.............

ower P = -4.5DPerson is SUFFERING from Myopia. Focal LENGTH F = 1/P = 1/-4.5 *100 = -22cm

10kgheight = 100CM = 1 mKE = PE = MGH = 10×9.8×1 = 98 JKE = 98 J=> 1/2 mv^2 = 98=> v^2 = 98×2 / 10=> v^2 = 19.6 => v = √19.6 m/s=> v = 4.4 m/sKinetic ENERGY is 98J and velocity is 4.4 m/s

y, V = 20m/stime = 4seconddisplacement = VT = 20×4 = 80mHence, DISTANCE traveled is 80M.(Distance and displacement are same here)

is the ANSWER to the QUESTION

s of COPPER will be 63.5 GM

e KNOW, now, in this CASE, the MAN has a weight 70kg and carries an additional weight of 10 kg with him to the top if a tower 100 m high.so, the WORK done by the man will be