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120/80mmhg human ka bp hota h

Normal BP of human is 120/80

by different method

2 is correct answer.

2) is the right answer of the following

Unit of heat is independent of choice of temperature interval. Unit of heat is say Joule in S.I and Calories in C.G.S, is independent of temperature, temperature interval, temperature gradient etc.

U= -15cmv= 5cmf= ?and to find a radius of curvature formula isR=2fso, using mirror formula 1/f=1/u+1/vputting values 1/f=1/-15+1/51/f=5+(-15)/751/f= -10/75cross multiple-10f=75f=75/-10f= -7.5So, R=2f2×-7.5R= -15

(a) The process by which the ciliary muscles change the focal length of an eye lens to focus distant or near objects clearly on the retina is called the power of accommodation of the eye.

(b) For the first one P = -2.0D

And we know that,P= 1/ f

Therefore, f = 1/ P = 1/ -2.0 = -0.5m = -0.5 ×100 = -50 cmThis is a concave lens.

Now for the second oneP = 1.5DP= 1/ f

f = 1/ P = 1/ 1.5 = 2/3 × 100 = 66.6 cmThis is a convex lens.

a. Power of accommodationis the ability of theeyelens to focus near and far objects clearly on the retina by adjusting its focal length.Power of accommodationof theeyeis limited. It implies the focal length of theeyelens cannot be reduced beyond certain minimum limit.

P=1/f-2.0=1/ff=1/-2.0f=-0.5cm

P=+1.5DP=1/f+1.5 D=1/ff=1/1.5f=0.66cm

Power is work done per unit time. SI unit of power is watts.

Given:

Frequency = n=2kHz= 2x1000 Hz

Wavelength=lambda= 40cm=40/100=0.4m

Speed of sound:

V= frequency * wavelength

=2×1000×0.4

=800m/s

Speed = Distance/ time

Distance= 1.6 km= 1.6x1000 m

Time= distance/ speed

= 1.6x1000/ 800

=16×100/800

=2sec

Therefore time required to travel 1.6km is 2 sec.

what type of answer is this

Ans :- Phosphorus is very reactive non metal

Speed = Distance / Time Time = Distance / Speed Speed = 20m/s Distance = 36 km = 36000 m Time = 36000/20 = 1800 s = 30 min

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those 2 resistance are in series so those will be added up 2+2= 4 ohmafter that there will be 2 resistanceswhose value is 4 ohm , 4 ohm each so these will be in parallel and the resultant will be 4*4/8= 2 ohm

Resistors are in parallelso 1/R=1/3+1/6=(2+1)/6=3/6=1/2so R=2V=IRso current=10/2=5A

1/R=1/R1 +1/R2 +.....

Option B is the correct answer.

tq

Parallel combinationHere three resistances are connected in parallel.In this case the potential difference across the ends of all the resistances will be same and it will be equal to the voltage of the battery used.

For parallel connectingthe resistors are all connected across the battery. So the same potential difference acts across all the three resistors and the potential difference is equal to the emf of the battery.

by connecting in parallel combination is the correct answer of the given question

When the three resistors are in series, effective resistance in the circuit = 3R.Power dissipated in the series circuit = Pseries= V^2/(3R) = 10 W ⇒V^2/(R) = 30 WWhen the three resistors are in parallel, effective resistance in the circuit = R/3.Power dissipated in the parallel circuit = Pparallel= V^2/(R/3) = 3V^2/(R) = 3 x 30 W = 90 W.

(i) a and b. This is the correct option because only Mollusca and Anthropoda have open circulatory system.

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On Earth,g=9.8m/s2. So, the object's weight on Earth will be:

W=30kg⋅9.8m/s2

=294 N

Dot product of two vectors is (3i+2j+4k)•(2i-2j-4k) = (6-4-16) = -14

now the magnitude of these vectors are √(3)²+(2)²+(4)² = √9+4+16 = √29 and √(2)²+(-2)²+(-4)² = √24 = 2√6

now angle between them is

cos∅ = dot product/(magnitude1*magnitude2) = -14/(2√6*√29) = -7/√174 ∅ = cos-¹(-7/√174)

100 J is the answer

A+B+C = i(1+4+5) +j(-2+4-8) +(3-4+9)k = 10i-6j+8k|A+B+C|= √(10)²+(-6)²+(8)² = √200 = 10√2

suppose the acceleration of particle is a3and for frame s1 , it is a1. and for frame s2 , it is a2

now from frame 1.the magnitude of acceleration of particle is 4m/s²so, |a3-a1| = 4

from frame 2.the magnitude of acceleration of particle is 4m/s²so, |a3-a2| = 4

on adding we can get max acceleration of 8 and minimum acceleration of 0.since acceleration is added and subtracted vectorily

so the relative acceleration between s1 and s2 can be in between 0 to 8.

option D

Weight of an object varies from place to place on earth due to variation in gravity at different places. There are factors due to which acceleration due to gravity may vary. Like altitude, latitudes and even the spinning of our planet may vary acceleration due to gravity at different places on earth.

Impulse I = change in momentum

I= mv’-mv

we will take vertival and horizontal component

angle theta = 45’

I= (mvcos45°-mvsin45°)-(mvcos45°-mvsin45°)

vertical resolution cancelout & horizontal adds up

I=2mvsin45

I=2*0.05*20*1\root2

= 1\root2 N-s

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