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Angstrom is unit which is used to measure Length.

It is the smallest unit of length.

The unit of length is angstrom

Unitless quantity-the quantity which is measured consist no unit . These quantity are relative to some other quantity or have some constant value. ex -specific gravity, relatives permittivity. Important thing is thatAll unitless quantity are dimensionless quantity.

Dimensionless quantity- these are the quantity which are out of frame reference or coordinate geometry.ex mass(kg) , temperature(F/C),pressure(N/m2).

Note-all Dimensionless are not unitless. They may have unit or may not.

Minerals are naturally occurring inorganic solids with a crystalline structure and a definite range of chemical formula. Ores are concentrations of minerals in rock that are high enough to be economically extracted for use. All ores are minerals, but all minerals are not necessarily ores.

When a capacitor Is charged by a battery., it has to perform more and more,work done is stored as electric energy in capacitor,Therfore the work done is given as:dW = V dqAs we know that q =CVV = q/CW =∫dW =∫Vdq = ∫q/C dq= q^2/2C

option c is the answer.

Yes, newton's third law can be applied to the gravitational force. According to newton's law of gravitation, every body in the universe attracts every another body. Also, the force of attraction between two bodies are equalin magnitude and opposite in direction.

For example: when a apple falls towards the earth, both the apple and earth attracts each other with a force which are equal in magnitude and opposite in direction.

30° because normal ray is 90 so when we find angle of deviation 90 - 60=30°

sorry friend I don't know

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acceleration=v-u/ta=60-20/6=40/6=6.6km/hr^2

wrong.

The International Principles on the Application of Human Rights to Communications Surveillance is a document which attempts to "clarify how international human rights law applies in the current digital environment".

This is wrong answer

This is also wrong i think the answer should be 156375 J.

Mass of the car,m= 1500kg

Initial velocity of the car = 30km/hr

= 30×1000m/60 ×60s

=8.33m/s

Similarly,the final velocity of the car,

v= 60km/hr

=16.67 m/s

Therefore,the initial kinetic energy of the car,

E(initial) = 1/2 mu^2

=1/2×1500×8.33

52041.68 J.

The final kinetic energy of the car,

E(final) = 1/2 1500×16.67

=208416.68 J.

Thus, the work done = change in kinetic energy

= E(final) - E(initial)

= 208416.68 - 52041.68

= 156375 J.

sorry for inconvenience, the conversion is done wrong in previous solution. Last solution is correct

Work = Change in kinetic energy= 0.5 m (v² - u²)= 0.5 × 1500 kg × [(60 × 5/18 m/s)² - (30 × 5/18 m/s)²]= 156250 joules= 156.25 kJ

Work done is 156.25 kJ

Lightning is an electric discharge from cloud which can travel through metallic rod of theumbrella. Because of this, the person carryingumbrellamay experience electric shock. Hence it is notsafe to raiseanumbrelladuring thunderstorm.

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Materials and components that obey Ohm's law are described as "ohmic" which means they produce the same value for resistance (R = V/I)

R =V/'I = 4.5/3*10^3

R = 1.5*10^-3

R = 1.5*10^-3 Ohms

phi1=π/3and phi2=π/4hence difference is π/3+π/4=11π/12

say answer

y = 0.01 sin 50 pi t=> Amplitude = 0.01 m2pi /T = 50 pi=> 1/T = 25=> Frequency = 25 Hz

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Displacement in SHM is given by x = A sin( wt) where A is amplitude, w is angular velocity, t is instantaneous time.

Velocity is rate of change of displacement with time. Differentiating displacement with respect to time, we have,

V = Aw cos(wt)

Phase difference between sin and cos function is 90 degrees or pi/2 radians . Hence phase difference between displacement and velocity is 90 degrees or pi/2 radians.

Similarly, acceleration can be obtained by differentiating equation of velocity.

Acceleration a = - Aw^2 sin (wt)

Hence phase difference between velocity and acceleration is also pi/2.

Phase difference between displacement and acceleration is pi radians or 180 degrees.

Hope this will clear concept

(i) displacement is x = 5 sin (2π/T t ) = 5 sin (π t ) [cm] x(t=1/3) = 5 sin (π/3) = 5*√3/2.

(ii) then the velosity would be v = 5π cos (π t) [cm/s] v(t=1/3) =2.5π

(iii) acceleration a = -5 π2sin (π t) a(t=1/3)= -2.5π2√3

(c)Zero net force

The kite is stationary inthe sky, i.e., it is not moving at all. Hence, as perNewton’s first law of motion, no net force is acting on the kite.

When a bodyis moving with a constant velocity, thenet external force actingon thebodyiszero. Yes, evenwhenthenet external forceiszero, an object may travel withnon-zerovelocity.

The answer is False.

Net force will be zero as F = mai. this case change i. velocity is zero so acceleration will be zero hence...F=20 × 0 = 0 newton

since the velocity is constant there isn't any force acting.

Zero net force

The kite is stationary inthe sky, i.e., it is not moving at all. Hence, as perNewton’s first law of motion, no net force is acting on the kite.

T=F/2l=728/2*5=72.8dyne/cm

Potential energy = (1/2) kx^2=(1/2) mω​^2x^2Kinetic energy = (1/2) mv^2= (1/2) m[ω​√​(A^2-x^2)]^2=(1/2) mω​​^2(A^2-x^2)Where,xis the required position about the mean position,A is amplitude of SHM,m is mass of particle executing SHM,ω​​ is the angular frequency of the particle.

Given, P.E. = K.E.so, (1/2) mω​^2x^2 = (1/2) mω​^2(A^2-x^2)so, x^2= A^2/2so,x =A/√2

I knew it I want 2nd part

The equation of the simple harmonic motion is y = A sinωt with usual notations.

The total energy is (½) m ω2a2and the kinetic energy is (½)m ω2(a2–y2).

Therefore we have (½) m ω2a2= E and(½)m ω2( a2–y2) = 3E/4.

Dividing the second equation by the first, 1 – y2/a2= ¾, from which y = a/2.

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The moment of inertia, otherwise known as the angular mass or rotational inertia, of a rigid body is a tensor that determines the torque needed for a desired angular acceleration about a rotational axis; similar to how mass determines the force needed for a desired acceleration.

Themoment of inertia, otherwise known as the angular mass or rotationalinertia, of a rigid bodyis a tensor that determines the torque needed for a desired angular acceleration about a rotational axis; similar to how mass determines the force needed for a desired acceleration.

Force F = 50 dynes

⊥ distance = 75cm

∴ Moment of force = F × ⊥ distance

= 50 × 75 = 3750 dynecm

Short-sightedness, ormyopia, is a very common eye condition that causes distant objects to appear blurred, while close objects can be seen clearly.hence the ray from a distant object are focussed before they reach the retinaoption 2

Volume V = 67.2 litres of Helium at STP

ΔT = 15⁰K1 mole of an ideal gas occupies 22.4 litres at STP. So number of moles of Helium gas n = 67.2/22.4 = 3

we know that γ = ratio of specific heats for an ideal mono atomic gas = 5/3 C_p = heat capacity at constant pressure for a mono atomic gas = 5/2 R C_v = heat capacity at constant volume for a mono atomic gas = 3/2 R

Change in internal energy = n C_v ΔT = 3 * 3/2 * 8.31 J/mol/°K * 15°K = 560.925 Joules

There is no change in the volume and hence no work done in heating the gas by 15 deg.

Heat supplied = change in internal energy = 560.925 Joules

502 kinatic energy is releases

it may be iron..

option b

Copper rod joined to a steel rod.the rods have equal length and equal cross-sectional area.the free end of the copper rod is kept at 0 degree and that of steel rod is kept at 100 degrees.find temperature at the junction of rods.conductivity of copper=390W/m-c and that of steel=46W/m-c

Since voltmeter and , ammeter are connected across x Ω , so, V across X = 10 and, i = 5A

so,The vakue of resistance X is 10/5 = 2Ω .

I did the same bro but unfortunately the answer is 3

Ans :- An object willfloatinwaterif its density is less than that ofwater.A steel needle sinkssince its density is more thanwater. The interior of aship is hollow. Therefore, its average density is less than that ofwater, therefore, itfloats.

Elasticity is defined as the property by virtue of which a material is able to stretch when a force is applied and is able to get back to its original state when the force is removed.

Steel is more elastic than rubber as rubber come back to its original position after stretching,but after this there is some looseness or u can say it becomes loose but in case of steel even after very frequent stretching it don'tbecome loose.