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Charges always occur together ( positive and negative)

GivenForce = m g = 500 kg x 9.8 m/s²=4900 NVelocity = 0.4 m/sNow, power=Force x velocity=4900 x 0.4=1960 WNow 1 W = 0.00134 hpSo, 1960 W=1960 x 0.00134=2.6 hp

Given -mass of lift = 500 kgg = 10 m/s2velocity (v) = 0.4 m/s

displacement D in 1 sec = 0.4m

to find - HP of motor used

solution -assuming that the motor is an ideal one-work done = force x D= m x g x D= 500 x 10 x 0.4 = 2000 Nm.

time taken = 1 sec

Power = work done / time= 2000 / 1 = 2000 W = 2kW = 2.68 HP [ 1 watt =0.00134 HP]

hence required hp of motor = 2.68 HP (ANS)

Are you sure

option(b) is correct Reason: we wil just eliminate t from both the equation . so,

x = 3t² , and y =2t => t = y/2

just put this back.in x we get x = 3(y/2)² or x =3/4(y²)

the equation is y² = 4x/3

it is an equation of parabola symmetry about x.

thanku

Brewster's law, relationship for light waves stating that the maximum polarization (vibration in one plane only) of a ray of light may be achieved by letting the ray fall on a surface of a transparent medium in such a way that the refracted ray makes anangleof 90° with the reflected ray.

Correct Answer:

The current will reverse its direction as the electron goes past the coil

U =this right answer

thanks

°F = (°C * 9/5) + 32°C = (°F - 32) * 5/9

To find the temperature when both are equal, we use an old algebra trick and just set ºF = ºC and solve one of the equations.

°C = (°C * 9/5) + 32°C - (°C * 9/5) = 32-4/5 * °C = 32°C = -32 * 5/4°C = -40

°F = (°F * 9/5) + 32°F - (°F * 9/5) = 32-4/5 * °F = 32°F = -32 * 5/4°F = -40

At the physically impossible-to-reachtemperatureofzerokelvin, or minus 459.67 degrees Fahrenheit (minus 273.15 degrees Celsius), atoms would stop moving. As such, nothing can be colder thanabsolute zeroon the Kelvin scale..

Let us first consider what we may expect in a circular path, we note that in a uniform circular motion, the magnitude of my tangential velocity is 0, and the magnitude of my tangential acceleration, but there is still an acceleration, I mean, there has to be, otherwise our object by Newton’s first law would just dart off in a straight line.

The charge of an electron is:q = 1.6x10^-19 C

So, the number of electrons needed is:n = Q/q = (2.4*10^-6 C)/(1.6x10^-19 C) = 1.81x10^13 electrons

Neutral point. A mathematical analysis of the longitudinal static stability of a complete aircraft yields the position of center of gravity at which stability is neutral. This position is called the neutral point.

The defect of vision is myopia.

Using the formula 1/f = 1/v - 1/u

Given u = - 180 cm, v = - 80 cm1/f = - 1/80 + 1/160 = - 1/160

f = - 160 cm

Power = 1/f( in metres) = - 1/1.60 = - 0.625 D

A concave lens of focal length 4 m should be used.​

plz explain how 4 cm comes out

Since the person suffers from Myopia, the corrective lens will be concave or diverging lens.

Given, that the person can't see objects beyond 1.2 m directly.So, in order to view the distances beyond 1.2 m, the focal length of the lens should be 1.2 m.

Power of lens = 1 / focal length (in meter)P = 1/(-1.2)P = -0.83 Diopter

Therefore the power of the lens should be - 0.83 D

Please like the solution 👍

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

Why do stars twinkle

The person goes 30 m in north, and then 20 m in east and then 30√2 m in south west. Now, if we draw this diagram on a paper, then it would form a right-angled triangle kind of thing. So, the final position would lie on the hypotenuse of the triangle. Now, studying the diagram a more, we get,

length of hypotenuse = root(302+ 202) = 10√13 m

net displacement vector = 10√13 - 30√2

==> 42-36.6

==>5.4 m

please provide complete question

option (i) is the correct answer

option 1 is a answer to your question

Here,v=?u=20a=4t=3

so,a=(v-u)/tor, 4=(v-20)/3or, v-20=12or, v=12+20or, v=32

Sir Chandrasekhara Venkata Raman, or CV Raman as he was better known, won the Nobel Prize for Physics in 1930 “for his work on the scattering of light and for the discovery of the effect named after him”.

10 electrons is the capacity of d orbital s

c) is the correct answer

is the answer of part b zero?

The answer is Option C.

,

but the answer given in the book is different from you

Mass of bullet = a

Mass of wood = c

Velocity of bullet = b.

Initial momentum of the bullet = ab

Initial momentum of the wood = c×0 = 0 (because the wood was at rest)

Final mass of the system = a + c (because bullet goes inside the wood)

Let the velocity of the system = v

We know that

Initial momentum = final momentum

Initial Momentum of bullet + initial momentum of the wood = final momentum of the system

ab + 0 = (a + c)v

=>v = ab/(a + c)

Impulse(symbolized byJorImp) is theintegralof aforce, F, over thetimeinterval, t, for which it acts. Since force is avectorquantity, impulse is also a vector in the same direction. Impulse applied to an object produces an equivalent vectorchangein its linearmomentum, also in the same direction.TheSIunit of impulse is thenewton second(N⋅s), and thedimensionally equivalentunit of momentum is the kilogram meter per second (kg⋅m/s). The correspondingEnglish engineering unitsare thepound-second (lbf⋅s) and theslug-foot per second (slug⋅ft/s

1. Water is essential to life because all life forms are dependent on it.

2. Life began in the presence of water.

3. Water is the medium of life.

4. It is the most abundant compound found in all organisms. It varies from 65 to 89 % in different organisms.

5. Human tissues contain about 20 % water in bone cells and 85% in brain cells.

6. Almost all the reactions of a cell occur in the presence of water.