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Let the mass of the body on the surface of Earth = m kgweight of the body on Earth = m * g = G M m / R² g = 9.8 m/sec² on Earth g = acceleration due to gravity = G M / R²

The weight of a body on a planet is directly proportional to Mass of the planet and inversely proportional to square of radius of the planet.

Therefore, weight of body on planet= 392 * 2 / (4)² Newtons = 98 Newtons

may be 22.4km/sec

how did we get underroot8

okay got it thanks..

In physics (specifically, celestial mechanics), escape velocity is the minimum speed needed for a free object to escape from the gravitational influence of a massive body. The escape velocity from Earth is about 11.186 km/s (6.951 mi/s; 40,270 km/h; 36,700 ft/s; 25,020 mph; 21,744 kn) at the surface

v^2-u^2=2ghh=v^2-u^2/2gh=0^2-40^2/2×-10 h=-1600/-20 h=80m (a)80m/2=40m (Ans)

U=mgh =10×10×80 = 8000J (Ans)

We can see in the figure if U draw:HF = height of the man = 180 cmE = Eye of human i.e. HE = 10 cmHere it can easily be noticed that AE=AH=POBE=OQ=BFDue to reflection, we need the mirror of the length i.e. PQ i.e. HF/2 = 90cm

Given

Radius of orbit = r= 0.5 Å = 0.5 X 10^-10m

Frequency of revolution = f = 10^10MHz = 10^16Hz

Charge on electron = e = 1.6 X 10^-19C

Magnetic moment = M = ?

The electron revolving in a circular orbit around the nucleus behaves as a current loop and hence posses a magnetic momentum

The magnetic momentum can be given as

M = I A

_ _ _ _ _ _ _ _ _ _ (1)

Where

I is a current flowing through the circular loop

i.e.

I = e / T

T is a time period=1 / f

Therefore

1 / T = f

I = e f

_ _ _ _ _ _ _ _ _ _ (2)

And

A is a area of circular loop

i.e.

A = π r^2

_ _ _ _ _ _ _ _ _ _ (3)

From equation (1) (2) and (3) we get

M = e f π r^2

M = 1.6 X 10^-19X 10^16X 3.14 X (0.5 X 10^-10)^2 M = 1.6 X 10^-19X 10^16X 3.14 X 0.25 X 10^-20 M = 1.6 X 3.14 X 0.25 X 10^-19X 10^16X 10^-20 M = 1.256 X 10^-23Am^2

The equivalent magnetic moment of an electron revolving around a nucleus in an orbit of radius 0.5 Å with frequency 10^10MHz is1.256 X 10^-23Am^2

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B. Solid cylinder

Take one hair strand make multimeter probes touches it on resistance nob so with this you find resistance is less than insulator i.e comb

So in front of comb, hair is an conductor..

So on conductor there are presence of free electrons that's y it's resistance is less than comb so while rubbing unwanted electrons of hair goes in comb so hair gets positively charged.

All phenomena that are not artificial.

Types ofnatural phenomenainclude: Weather, fog, thunder, tornadoes; biological processes, decomposition, germination; physical processes, wave propagation, erosion; tidal flow, andnaturaldisasters such as electromagnetic pulses, volcanic eruptions, and earthquakes

The phenomenon associated with formation of rainbow is:(i) Dispersion of sunlight by water droplets present in the atmosphere.(ii) Total internal reflection.(iii) Refraction of light.

positive charges is there in ebonite rod

Heat can be transferred from one place to another by three methods: conduction in solids, convection of fluids (liquids or gases), and radiation through anything that will allow radiation to pass. The method used to transfer heat is usually the one that is the most efficient. If there is a temperature difference in a system, heat will always move from higher to lower temperatures.

Wave' is a common term for a number of different ways in which energy istransferred: In electromagneticwaves, energy istransferredthrough vibrations of electric and magnetic fields. In soundwaves, energy istransferredthrough vibration of air particles or particles of a solid through which the sound travels.

Vehicles carrying inflammable materials usually havemetallic ropes.Vehicles carrying inflammable materials usually havemetallic ropes touching the ground during motion. ... In case, the charge accumulation becomes large, it may prove hazardous to thevehicle carrying inflammable materials.

a)cutting and piercing tools are made sharpbecause the area of contact reduced so that pressure increases andcuttingbecome easy. b) this is because of density as salty water have higher density as compare to fresh water so, egg floats on salty water but sinks in fresh water.

thanks for solving my problem

4 option is correct

Yes.... But sir can i have the solution please ✌️

hope you get it

Ya.... Thnks buddy ✌️✌️

Let the total angle twisted by A and B is(not mentioned in question) and twist angle made by A and B will beθ1andθ2respectively.henceθ=θ1+θ2.......1>(totalangletwistediscontributionofindividualangulartwist)now the force applied produce the torque on B and a restoring torque is produce in A to counter torque of B this continuous till both the rods does not archives the condition of equilibrium.using the formula of torque in both cylinder A and B

Torque clockwose by B = torque anticlockwise by A

n* pi* (2r)4 theta2/ 2L = n * pi* (r)4 theta1/ 2L

Theta1 = 16 * theta2

Hence

Theta2 + 16 theta2 = theta

Theta2 = theta/17

And

Theta1 = 16 theta/17

Mass = 81 grams =0.008 kgInitial reading = 54 mlFinal reading = 63 ml

Volume of sphere = Amount of water displaced by it

Amount of water displaced =Final reading -Initial reading= 63 - 54= 9mlVolume = 9 ml = 9 cm³ [1 ml = 1 cm³]

Density = Mass / Volume= 81/9= 9g/cm³=9000 kg/m³ [1g/cm³ = 1000 kg/m³]

When light travel parallel to principal axis, after reflection or refraction the rays of light meets or appears to meet at a point on principal axis called principal focus

A line passing from the center of curvature and pole in a mirror or lens is known as principal focus

focus, also called animage point, is the point wherelight raysoriginating from a point on the object converge.[1]Although the focus is conceptually a point, physically the focus has a spatial extent, called theblur circle.

focus also called an image point is that the point where the light rays otiginste

Ingeometrical optics, afocus, also called animage point, is the point wherelight raysoriginating from a point on the object converge.[1]Although the focus is conceptually a point, physically the focus has a spatial extent, called theblur circle. This non-ideal focusing may be caused byaberrationsof the imaging optics. In the absence of significant aberrations, the smallest possible blur circle is theAiry disc, which is caused bydiffractionfrom the optical system'saperture. Aberrations tend to get worse as the aperture diameter increases, while the Airy circle is smallest for large apertures.

An image, or image point or region, isin focusif light from object points is converged almost as much as possible in the image, andout of focusif light is not well converged. The border between these is sometimes defined using a "circle of confusion" criterion.

Aprincipal focusorfocal pointis a special focus:

For alens, or aspherical or parabolic mirror, it is a point onto whichcollimated lightparallel to the axis is focused. Since light can pass through a lens in either direction, a lens has two focal points – one on each side. The distance in air from the lens or mirror'sprincipal planeto the focus is called thefocal length.

Ellipticalmirrors have two focal points: light that passes through one of these before striking the mirror is reflected such that it passes through the other.

The focus of ahyperbolicmirroris either of two points which have the property that light from one is reflected as if it came from the other.

Diverging (negative) lenses andconvex mirrorsdo not focus a collimated beam to a point. Instead, the focus is the point from which the light appears to be emanating, after it travels through the lens or reflects from the mirror. A convex parabolic mirror will reflect a beam of collimated light to make it appear as if it were radiating from the focal point, or conversely, reflect rays directed toward thefocusas a collimated beam. A convex elliptical mirror will reflect light directed towards one focus as if it were radiating from the other focus, both of which are behind the mirror. A convexhyperbolicmirrorwill reflect rays emanating from thefocal pointin front of the mirror as if they were emanating from the focal point behind the mirror. Conversely, it can focus rays directed at the focal point that is behind the mirror towards the focal point that is in front of the mirror as in aCassegrain telescope.

In geometrical optics, a focus, also called an image point, is the point where light rays originating from a point on the object converge. Although the focus is conceptually a point, physically the focus has a spatial extent, called the blur circle.The principal focus of a spherical mirror is a point on the principal axis of the spherical mirror at which, the light rays which are parallel to the principal axis actually converge (meet) or appear to diverge after reflection.

a point on a principal axis from which light rays passes is called principal focus.

It may be 13.9m/s or 6.67m/s

please keep the photo clear

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The principal focus of a spherical mirror is a point on the principal axis of the spherical mirror at which, the light rays which are parallel to the principal axis actually converge (meet) or appear to diverge after reflection.

Light rays that are parallel to theprincipal axis of a concave mirrorconverge at a specific point on itsprincipal axisafter reflecting from themirror. This point is known as theprincipal focusof theconcave mirror.

Define theprincipal focusof aconcave mirror. Answer: Light rays that are parallel to theprincipal axisof aconcave mirrorconverge at a specific point on itsprincipal axisafter reflecting from themirror. This point is known as theprincipal focusof theconcave mirror.

Light rays that are parallel to the principal axis of a concave mirror converge at a specific point on its principal axis after reflecting from the mirror. This point is known as the principal focus of the concave mirror.

Principal focusof aconcave mirroris apointwhere light rays parallel toprinciple axisconverge. Thedistancebetween pole ofmirrortopointofprinciple focusisfocal lengthofmirror.Focal lengthofspherical mirroris half of its radius of curvature.

Answer: Principal focus of a convex mirror is a point on the principal axis, where a beam of light, parallel to the principal axis, after reflection, appears to meet (convex).

Principal focus is a point on the principal axis, where a beam of light, parallel to the principal axis, after reflection, either actually meets (concave).

Find midpoints of each triangle join them and find CM.

It is wrong if you solve it you will get 7a/24(x coordinate) as answer but real answer is 7a/18

TheP-type semiconductorhas a large number of hole in the conduction band and less number of electrons in the valence band, so holes are called majority carriers and electrons are called minority carriers. A trivalent impurity such as Boron is mixed with the silicon atoms.

The slope of the V-I graph gives the effective resistance in the circuit. For a give set of resistors, the parallel combination will have less resistance than the series combination. As the slope of the line X is less than the slope of Y, line X represents the parallel combination

X represent parallel combination

Potential difference V=I R

And we also know that,the electric charge is given by: Q = I ∙ t.

or I=Q/t

So V=(Q/t) x R=(200/25) x 20=160V

The slope of the V-I graph gives the effective resistance in the circuit. For a give set of resistors, the parallel combination will have less resistance than the series combination. As the slope of the line A is less than the slope of B, line A represents the parallel combination

uniform motion , means constant Velocity , constant slope

option A

Option B as slop is same and its a linear graph

uniform motion means constant velocity

so, option A is correct , because slope of s-t is constant.

option d , because slope is 0, so velocity is 0

Total number of girlss = (10 + 27 - 1)= 37 - 1 = 36So, Rajani's position from the right= (36 - 10) + 1 = 26 + 1 = 27