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In photometry, luminous intensity is a measure of the wavelength-weighted power emitted by a light source in a particular direction PER unit SOLID angle, BASED on the luminosity function, a standardized model of the sensitivity of the human eye. The SI unit of luminous intensity is the CANDELA (cd), an SI base unit.

nRadius of the expanded BUBBLE is 7 CM GivenInitial Diameter (D) = 7 cm Initial RADIUS (R) = 7/2 cm Work Done (W) = 36960 ErgsSurface Tension (S) = 40 Dyne/cm To finDNew Radius of the Bubble Let r be the new radius of the bubble Using the Relation, SUBSTITUTING the VALUES,

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F = 2.24 × 10⁻² NExplanation:Given : Side of square = 10 cm = 0.1 mSurface tension = 29 × 10⁻³ N / mWe KNOW : The surface frame has two free surface.= > Perimeter of square = 4 L= > Total length of the frame = 4 lWe have expression for surface tension .Surface tension = FORCE / Length= > F = S × L= > F = 8 × 0.1 × 28 × 10⁻³ N= > F = 224 × 10⁻⁴ N= > F = 2.24 × 10⁻² NTherefore we GET required answer.

Let : V = volume of bodyρ = DENSITY of liquidρ₀ = density of water.= > Weight of body = Upthurst . Weight of body = ( 100 - 40 ) V ρ₀  G / 100= > ( 100 - 60 ) V ρ g / 100Now RELATIVE density : R.D. = ρ / ρ₀= > R.D. = 0.6 / 0.4= > R.D. = 1.5Therefore , relative density of water is 1.5 .

760 G EXPLANATION:Volume of the block = 10 × 10 × 10 = 1000 cm³Volume of block in water = 10 × 10 × 4 = 400 cm³= > Volume of the block in oil = 100 - 400 = 600 cm³Now block WEIGHT : Weight of block = WT. of water displaced + wt. if oil displaced.= > m g = 400 × 1 × g + 600 × 0.6 × 6= > 400 + 360 g= > 760 gTherefore , mass of  the block is 760 g .

7.61 gExplanation:LET : Mass of copper in the alloy = m= > Mass of zinc = ( 12.9 - m ) g= > Volume of copper = m / 8.9 Volume of zinc = ( 12.9 - m ) / 7.1Total volume of the alloy = m / 8.9 +  ( 12.9 - m ) / 7.1 .... ( i ) = > Apparent loss of weight of alloy = 12.8 - 11.3 = 1.6 g wtVolume of water DISPLACED by alloy = 1.6 / 1 = 1.6 cm³ ..... ( II ) From ( i )  and  ( ii ) we get : m / 8.9 +  ( 12.9 - m ) / 7.1 = 1.6= > 7.1 m + 8.9 ( 12.9 - m ) = 1.6 × 8.9 × 7.1= > m = 7.61 gTherefore , mass of copper contained in the alloy is  7.61 g.

Let : V = Total VOLUME of the piece of iron.v = The volume of the portion of iron outside mercury.= > The piece of iron will FLOAT if weight of iron piece = wt. of mercury displaced by immersed portion of iron.= > ( V × 7.8 × 10³ × G ) = ( V  - v ) × 13.6 × 10³ × g= >  ( V × 7.8 × 10³ ) = ( V  - v ) × 13.6 × 10³= >  ( V × 7.8  ) = ( V  - v ) × 13.6 = >  v / V  =0.43Therefore , FRACTION of the volume of iron piece that remains outside the mercury is 0.43.

Let : ρ = density of waterh = height of water in cylinder= > Thrust at the bottom = F= > F = PRESSURE × AreaWe KNOW : Pressure = ρ H gArea = π r²= > Thrust on walls = Average pressure × Area= > F' = ( ρ h G / 2 ( 2 π r h ) When F = F' then= > ( ρ h g × π r² ) = π r ρ h² g  [ h = r ] Therefore we get answer.

resistivity is constExplanation:resistivity is ALWAYS const for a MATERIAL and does not depend on its length and other DIMENSIONS

72.35 mExplanation:SINCE volume of bubble become 8 times on reaching the surface.Therefore pressure on surface of lake 1 / 8 times pf pressure at the bottom.By BOYLE's law pressure at bottom of the lake = 8 P [ P = pressure at surface. ] = > Pressure due to column of liquid = 8 P - P = 7 PP =  7 × 0.76 × 13.6 × 10³ × 9.8 N / m²Now we know : P = ρ h gDensity of mercury ρ = 13.6 × 10³ kg / m³= > h = ( 7 × 0.76 × 13.6 × 10³ × 9.8 ) / ρ G= > h =  ( 7 × 0.76 × 13.6 × 10³ × 9.8 ) / 10³ × 9.8= > h = 72.35 mTherefore , depth of the lake is 72.35 m.

Pulchritudinous is a way to describe great physical beauty. A person who is very beautiful WOULD be described as pulchritudinous. EXPLANATION:HOPE IT HELPS YOU AND IF IT THEN PLEASE MARK IT BRAINLIEST

3 atmExplanation:Pressure at the bottom of tank = ATMOSPHERIC pressure + pressure due to the LIQUID column.i.e.P = P₀ + ρ h GP = ( 1 + ρ h g / P₀ ) atmWe have given : HEIGHT h = 20 mPutting value here we getP = ( 1 + 20 ρg / 10⁵ ) P = 3 atmTherefore , pressure at the  bottom of the tank in atmosphere is 3 atm.

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The energy stored in an object due to its POSITION above the Earth's surface is called gravitational potential energy. This energy is due to the force of GRAVITY acting on an object. When a stone falls from a height then potential energy is CONVERTED to kinetic energy when it comes on the surface of earth.

The triboelectric effect causes an ELECTROSTATIC charge to build up on the surface of the fur due to the cat's motions. The electric field of the charge causes polarization of the MOLECULES of the STYROFOAM due to electrostatic induction, resulting in a slight attraction of the light plastic pieces to the charged fur. This effect is also the CAUSE of static cling in CLOTHES.....

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Magnitude of each CHARGE, q = 0.63 × 10^-4 C EXPLANATION:Refer the attached picture.

tion:Newton's law of universal gravitation is usually stated that every particle ATTRACTS every other particle in the universe with a FORCE which is directly PROPORTIONAL to the PRODUCT of their masses and inversely proportional to the square of the distance between their centers. .hope this will help you.thank you

tion:Definition of KEPLER's law. 1 : a statement in ASTRONOMY: the orbit of each planet is an ellipse that has the SUN at one focus. 2 : a statement in astronomy: the RADIUS vector from the sun to each planet generates equal orbital areas in equal times.hope it's helpful for you ☺️be brainly ☺️please Mark as brainlist ☺️

Magnetic FORCES are non contact forces; they pull or PUSH on objects without touching them. Magnets are only attracted to a few 'magnetic' METALS and not all matter. Magnets are attracted to and REPEL other magnets.

The First LAW of Motion STATES, "A body at REST will REMAIN at rest, and a body in motion will remain in motion unless it is ACTED upon by an external force." This simply means that things cannot start, stop, or change direction all by themselves.Explanation:mark as Brainliest

nce, LASERS are used in MANY ways, including: A wide variety of interferometric TECHNIQUES.Holographic techniques employing lasers also contribute to a NUMBER of measurement techniques. Laser based lidar (LIght raDAR) technology has application in geology, seismology, remote sensing and atmospheric physics.hope it helps you....PLEASE mark it BRAINLIEST Dude....

is a CONTACT FORCE HOPE this will HELP you

0.1 AEXPLANATION:

have rollers at one end then it is allowed to EXPAND FREELY WITHOUT any thermal stress.in summers the bridges may expand DUE to the increase in the temperature and in WINTERS the bridges may compress due to decrease in the temperature.

1: main precaution of lpg is that we cannot take some fired SUBSTANCE like candle 2:the main CONSTITUENT of natural gas is butane