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on balancing horz and vertical ,

b = acos(45°)=> b = a/√2

and asin(45) = 10 => a/√2 = 10 => a = 10√2

so, b = a/√2 = 10

so √2|a|+|b|= √2|10√2| +|10| = 20+10 = 30

option 3

30 or 20?

option 3 is correct

but 10+10 is 20 not 30

it is asked √2|a| +|b| , and a. = 10√2 and b = 10

value of a is 10√2 and not 10/√2 ,

you have taken a as 10/√2 but it is 10√2.

it can't be lesser than 10√2 , otherwise how can its component will balance 10, if it itself is smaller than 10.

it will always be greater than 10.

thannx

Scalar product =(3-4+5)(-2+1+3)=(-6+3+9)+(8-4-12)+(-10+5+15)=6-8+10=8 vector product=-6-4+15=5

1. Part I

1. Part II

2. Part 1

2. Part II

option 2

Draw vector diagram of given situation you will see there is 45° between force and displacement .w=Fdscos(Ф)w= 10x1xcos(45°)w=10x1x1/√2=10/√2Joption 2 is correct

option b iscorrect

Acceleration = F/m = 100/10= 10 m/sec^2

Final velocity v = u + at = 10 + 10*9 = 100 m/sec

Initial Kinectic energy = 1/2mu^2 = 5*10*10 = 500 J

Final Kinectic energy= 1/2mv^2 = 5*100*100 = 50000 J

Change in Kinectic energy = 50000 - 500= 49500 J= 49.5 KJ

Mass of the ball, m = 150 g = 0.15 kg

Initial speed of the ball, u = -12 m/s

Final speed of the bal after being hit, v = 20 m/s

Impulse = change in momentum = final momentum initial momentum

= Impulse = 0.15 × 20 0.15 × (-12) = 4.8 Ns

option C is the correct answer

18 units is the right answer

18units is the correct answerplease like my answer

option c is correct answer

pressure=force/area=25/25=1 N/m^2

I want some steps

Pressure= Force /Area10N/0.2= 10 N/m^2Answer= 10N/m^2

full answer is 50 N m-²

F=dp/Dr12=dp/4dp= 48

F=m(v-u)/tSo,12=m(v-u)/4Hence,m(v12=m(v-u)/4Hence,m(v-u)=12*4=48kgm/sSo, mv-mu=48kgm/sTherefore change in linear momentum of the body is 48kgm/s.

48N-s is the change in the linear momentum of the body.

48 is the correct answer of the given question

it will be F cos 37

it is mm square

In order toreducetheeddycurrent loss, the resistance of thecoreshould be increased. In other words, low reluctance should be retained. In devices like transformers, thecoreis made up of laminations of iron. ie,thecoreis made up of thin sheets of steel, each lamination being insulated from others

redundant array of independent disks. increase performance if disks

The retinal image is shaped by two lenses: 1) the cornea with a fixed focal length and 2) the eye-lens, which is a lens with variable focal length through shape changes.

Hence option d is right.

please like if you find it useful

The eye uses convex lens. 11Light is a mixture of seven colours. In air the lights travel at different speeds. When the light passes through a prism, it breaks it I to its constituent colours and therefore we can see a band of several colours called spectrum.This is the reason dispersion takes place in air and not possible in vacuum because in vacuum all lights travel at same speeds. 12Light helps us see things around us. We can see colours which are reflected to our eyes and we cannot see the colour which is absorbed.Therefore in dim light since no colour is reflected and colours are absorbed. Hence under dim light ever thing appears black. 13

the bullet looses 1/20th of its velocity then

V= 19/20u

Since, v² = u² + 2as

(19/20u)² = u² - 2as

2as = u² - (19/20u)² ................(1)

Now, initial velocity = 0

Therefore 0² = u² - 2a (ns)

u² = 2as (n)

u² = n [ u² - 19²/20² u²]

u² = nu² [ 20²-19²/20²]

20² = n [ 20² - 19² ]

20² = n [ (20+19)(20-19) ]

n = 400/39

n ~ 11 planks

I think it was 3rd option

no second

1 st option how i think 1

are you mad why are you typing in answer

clg ki raledu ami

Given there are 3 nuclei of B fuse to form 1 nucleus of A

so,. energy release will be difference between the binding energy of both the substances

energy of 3 nuclei will always be greater than that of 1 nucleus.. because in fusion some +ve energy is always dissipated.

Q = 3Eb-Ea

option 2

the answer for this question is 2h please inform me whether i am right or not

?

Given: h=50m=0.05kmR=6400kmDistance=√2hR=√{2×0.05×6409)=√640=8 √10km

Forcesthat do not store energy are callednonconservativeor dissipativeforces. Friction is anonconservative force, and there are others. Any friction-typeforce, like air resistance, is anonconservative force. The energy that it removes from the system is no longer available to the system for kinetic energy.

option B

option 1 half the active nuclei decay

The Four Basic Types Of Motion

Want to know more aboutlinear motionand the other three types? Everything naturally wants to move andchange. ...

Rotary Motion.Rotary motionis anything that moves in a circle. ...

OscillatingMotion. Something thatoscillatesmovesbackand forth. ...

Linear Motion. ...

Let us assume an artificial satellite, which is moving in a circular orbit of radius 42250 km covers a distance ‘s’ as it revolve around earth with speed ‘v’ in given time ‘t’ of 24 hours.= 42250Radius of circular orbit r

Time taken by artificial satellite t=24 hours

Distance covered by satellite s =Circumference of circular orbit

Speed of satellite v

= 3.073 km/s

thank u

As the initial velocity of the coin(as the man dropping the coin is moving up with elevator) and the velocity of the floor of elevator is same so the elevator can be taken at rest.Usings = ut + 1/2 at^2u = 0 s= 2.45mt = (4.9/9.8)^0.5 = (1/2)^0.5 option b

CH3COOH -----------> 4CO2+ 2H2OEnth. of combustion = Enthalpies of formation of products - enthalpies of formation of reactantstherefore,-867 kJ/mol = 4(-393.5) + 2(-285.9) - Enthalpy of formation of acetic acid.