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The sum of masses of nuclei of product element is less than sum of masses of reactants and hence, loss of mass takes place during the reaction. This difference of mass of product element and reactant converts into energy and liberated in the form of heat

AC commutator motors, like comparable DC motors, have higher starting torque and higher speed than ACinduction motors. The series motor operates well above the synchronous speed of a conventional AC motor. AC commutator motors may be either single-phase or poly-phase. The single-phase AC version suffers a double line frequency torque pulsation, not present in poly-phase motor. Since a commutator motor can operate at much higher speed than an induction motor, it can output more power than a similar size induction motor. However commutator motors are not as maintenance free as induction motors, due to brush and commutator wear.

From the above figure, we have:Angle between →A and →B = 110° − 20° = 90°∣∣∣→A∣∣∣=3 m and ∣∣∣→B∣∣∣= 4 m

Magnitude of the resultant vector is given byR=√A2+B2+2AB cos θ =√32+42+2×3×4×cos 90° = 5 m

Let β be the angle between →R and →A.β=tan−1 (A sin 90°A+B cos 90°) =tan−1 (4 sin 90°3+4 cos 90°) =tan−1 43 =tan−1 (1.333) =53°

Now, angle made by the resultant vector with the X-axis = 53° + 20° = 73°∴ The resultant →R is 5 m and it makes an angle of 73° with the x-axis.

False.

Correct statement is

Force = mass × acceleration

The formula is

Density (n)= Mass of nuclei/nuclear volume

Nuclear volume= 4/3 π r³

To find radius:-

r= r° (a)^¹/³

R= 1.3×10^-15(56)^1/3

R=3.825×1.3×10^-15

R=4.97×10^-15

R³==122.76×10^-45

4/3πr³= 513.96×10^-45

Density = mass/volumeDensity = 55×1.6×10^-27Density= 88×10^18/513.96Density = 0.1812×10^18Density =1.812×10^17 kg /m³.

24m/s2 avg acc.

option d

thanks I just wanna to verify my answer

MagneticMirror is a type of magnetic confinement device used in fusion power to trap high-temperature plasma using magnetic fields.

An optical fiber or optical fibre is a flexible, transparent fiber made by drawing glass or plastic to a diameter slightly thicker than that of a human hair.

CnH2n

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-12*X=-8X=-8/-12X=2/3

x=2/3 is the right answer of the following

Zinc ZnIron FeTungsten W

it means they can only attract by induction...

can i ask any confusion related to physics here?

Yes

if we rub two silk clothes then will they get charged??

plz bhai clear ans send kijiye

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answer of this question is 2 second

Thecharacteristics of musical sound:

1) Loudness or Intensity 2) Pitch and 3) Quality or Timbre. Loudness or Intensity: Loudness or intensity means how loud thesoundis. Intensity is the amount ofsoundenergy flowing per second per unit area perpendicular to the direction of propagation ofsound.

Each ball is moving in a straight line under uniform acceleration and is thus subject to the equation:

S = ut + 1/2 a t^2

… where S is distance travelled, a is the acceleration towards the ground and t is the journey duration.

We know the sum of their journeys is 100m and their journey durations are equal.

So

100 = (25t -1/2 g t^2) + (0t + 1/2 g t^2)

100 = 25t

So t = 4 seconds

Note: This is is the same time that it would have taken had there been no gravity and the thrown ball covered the entire distance itself. That is intuitive as whatever retarding gravity applies to the thrown ball is equal to the speeding up it applies to the dropped ball.

Note 2 (thanks to comment by Victor Mazmanian): We can assess when the thrown ball reaches its maximum height by solving (v = u+ at) for t when v is 0.

0 = 25 - gt

So t is 25/g … roughly 2.5 seconds

Hence at 4 seconds, when the balls meet the thrown ball is already on its way down after already reached its max height and started descending.

Under the effects of gravity the thrown ball reaches a max height of…

25.25/g - 1/2.g.(25/g)^2 = roughly 31.9 m

but has descending back down to a height of …

25.4 - 1/2.g.4^2 = 100–8g … roughly 21.5m, when the balls meet

And the dropped ball this covers the remaining 1/2.g.4^2 = 78.5m

shyla you done first wrong but thanks because your second try is right

answer of this question is 2 second

here, height is 100m.now the two ball meet at point p which is at a height x above the ground so that the distance of point p from the top is 100-x(1) for the ball falling from topheight=(100-x)minitial velocity=0

Thanks

The visual cells in the eyes called rods and cones convert light energy into electrical impulses. In light conditions certain chemical reactions see to that the sensitivity of the rods (which are responsible for vision in dim conditions) is reduced. Also the pupils (which regulate the amount of light entering our eye, analogous to the aperture in cameras) will be constricted. When we enter a dark room though the pupil will dilate in a couple of moments. But it takes some time for chemical reactions to occur in the eye (called dark adaptation) in order to enhance the sensitivity of the rods. Hence when we come from light to dark (also vice versa) we will be unable to see things for a couple of moments.

The visual cells in the eyes called rods and cones convert light energy into electrical impulses. In light conditions certain chemical reactions see to that the sensitivity of the rods (which are responsible for vision in dim conditions) is reduced. Also the pupils (which regulate the amount of light entering our eye, analogous to the aperture in cameras) will be constricted. When we enter a dark room though the pupil will dilate in a couple of moments. But it takes some time for chemical reactions to occur in the eye (called dark adaptation) in order to enhance the sensitivity of the rods. Hence when we come from light to dark (also vice versa) we will be unable to see things for a couple of moments.

Diamonds sparkle from reflected/refracted light, and the cut and polished faces on the stone enhance this. An uncut diamond is very unspectacular. It looks like scratched/frosted glass, reflecting very little light until it is polished.

Theenergyfrom theSun- bothheatandlight energy - originates from anuclear fusionprocess that is occurring inside thecore of the Sun. The specific type of fusion that occurs inside of the Sun is known asproton-proton fusion.

Using the mass-energy equivalence, we find that this 4.26 million metric tonnes of matter is equal to about 3.8 x 1026joulesof energy released per second.

are you sure plz reply

In a single isolatedatom, the electrons in each orbit have definite energy associated with it. But in case of solids all the atoms are close to each other, so the energy levels of outermost orbit electrons are affected by the neighboring atoms.

When two single or isolated atoms are bring close to each other then the outermost orbit electrons of two atoms are interact or shared with each other. i.e, the electrons in the outermost orbit of one atom experience a attractive force from the nearest or neighboring atomic nucleus. Due to this the energies of the electrons will not be in same level, theenergylevels of electrons are changed to a value which is higher or lower than that of the original energy level of the electron.

The electrons in same orbit exhibits different energy levels. The grouping of this different energy levels is called energy band.

However, the energy levels of inner orbit electrons are not much affected by the presence of neighboring atoms.

Important energy bands in solids

There are number of energy bands in solids but three of them are very important. These three energy bands are important to understand the behavior of solids. These energy bands are

Valence band

Conduction band

Forbidden band or forbidden gap

Hydroponics

d) solid, liquid and gases, it needs medium.

OK thanks

Electrons in the valencebandhave lowerenergythan the electrons in conductionband. The electrons present in the valencebandare loosely boundtothe nucleus of atom. Theenergy bandwhich isformedby grouping the range ofenergylevels of the free electrons is called as conductionband.

Answer:d)all the aboveExplanation:Reduced friction prevents heating and abrasion on the friction surface. Especially in the hydraulic system, lubricants itself serve to prevent the leakage by creating a hydraulic film.Friction certainly causes heating on the area and more heat is produced if metals rub against each other. Therefore the heat needs to be absorbed or released; otherwise the system is destroyed or deformed. To prevent it, lubricants are applied. Especially cooling is critical to rolling oils, cutting oils, and lubricating oils used in an internal combustion engine.

When the eye focuses on a near object, the eye must accommodate to be able to see the object clearly. The ciliary muscle contracts, which releases tension on the ligaments that suspend the eye. As a result, both lens surfaces become more curved and the eye thus focuses on the nearby object.