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The range of human hearing is generally considered to be20 Hz to 20 kHz, but it is far more sensitive to sounds between1 kHz and 4 kHz

One round completed by athlete in 40 sec.

In 2 min 40 sec or 160 seconds athlete complete = 160/40= 4 rounds.

As athlete start the race and end it at same point. So displacement is zero

We know that, velocity along a circular path =Circumferencetime=Circumferencetime⇒v=2πr40s⇒v=2πr40s⇒v=2×3.14×100m40s⇒v=2×3.14×100m40s⇒v=628m40s⇒v=628m40s⇒v=15.7m/s⇒v=15.7m/s(a) Distance after 140sWe know that,distance=velocity ×time⇒ distance=15.7m/s ×140 s = 2198 m(b) Displacement after 2 m 20 s i.e. in 140 sSince,rotatin in 40 s=1Therefore, rotation in 1s=1401s=140∴ rotation in 140s=140×140=3.5140s=140×140=3.5Therefore, in 3.5 rotations athlete will be just at the opposite side of the circular track, i.e. at a distance equal to the diameter of the circular track which is equal to 200 m.Therefore, Distance covered in 2 m 20 s = 2198 mAnd, displacement after 2 m 20 s = 200m

Above 20 hertz and below 20000 hertz

thanku

Working of Human EarSound waves are collected by the pinna and then are directed through ear canal sound waves on striking the eardrum make it vibrate exactly the same way as the given sound emitting object.The bones in thge middle ear start vibrating when eardrum vibrates. It helps in magnifying the vibrations. When the magnified vibrations reach the cochlea in the inner ear, the fluid in it starts vibrating.These vibrationsare picked up by sensory receptors and are converted into electrical signals.These electrical signals then travel to the brain which interprets sound.

When you swing a hammer you increase its kinetic energy, so that by the time it strikes the nail it imparts a large force which drives the nail into the wood.

The hammer is basically an energy reservoir to which you are adding energy during the course of the swing, and which is released all at once upon impact. This results in the impact force greatly exceeding the maximum force you can exert by just pushing on the nail.

P = 0.5 watt.

in 5 sec., W= Pt

⇒0.5×5

work⇒2.5 joule

W =ΔKE (work energy theorem)

2.5=1/2×0.2[v^2−0]

v = 5 ms^−1

19.5 ms because it's velocity will increase with rise in weight

I know it but what is the formula

An atom consists of a positivelycharged nucleussurrounded by one or more negativelychargedparticles called electrons. The number of protons found in thenucleusequals the number of electrons that surround it, giving the atom a neutralcharge(neutrons have zerocharge).

ChargeofElectron. Thechargeof theelectronis equivalent to the magnitude of the elementarycharge(e) but bearing a negative sign. Since the value of the elementarychargeis roughly 1.602 x 10-19coulombs (C), then thechargeof theelectronis -1.602 x 10-19C.Aug 27, 2009

ChargeofElectron. Thechargeof theelectronis equivalent to the magnitude of the elementarycharge(e) but bearing a negative sign. Since the value of the elementarychargeis roughly 1.602 x 10-19coulombs (C), then thechargeof theelectronis -1.602 x 10-19C.Aug 27, 2009

To determine thetotalelectricchargeof an atomicnucleus, just add up the number of protons. Since each one is +1, the number of protons will equal thetotalelectriccharge.

To determine thetotalelectricchargeof an atomicnucleus, just add up the number of protons. Since each one is +1, the number of protons will equal thetotalelectriccharge. You can neglect the number of neutrons in anucleusas they do not contribute to thetotalelectriccharge of the nucleus.

it's always positive and multiplicative of atomic no. with the basic charge of one proton.

To determine the total electric charge of an atomic nucleus just add up the number of protons.Since one is +1,the number of protons will equal the total electric charge. You can neglect the number of neutrons in a nucleus as they do not contribute to the total electric charge of the nucleus.

Answer : 7 cm

Explanation:Let O be the centre of the circle.

Given that,

OQ = 25cm and PQ = 24 cm

As the radius is perpendicular to the tangent at the point of contact,

Therefore, OP ⊥ PQ

Applying Pythagoras theorem in ΔOPQ, we obtain

OP2 + PQ2 = OQ2

OP2 + 242 = 252

OP2 = 625 − 576

OP2 = 49

OP = 7

Therefore, the radius of the circle is 7 cm.

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v sintheta horizontal and perpendicular to the plane

how explain with diagram

3rdequation of motion can be be applied:v^2 = u^2 + 2as, where acceleration is -ve. Hence v^2 = u^2 – 2as.

v, final velocity = 0. Therefore, u^2 = 2as.

i.e. s is proportional to u^2. → s1÷ s2= u1^2 ÷ u2^2

Therefore, s2= (u2^2 ÷ u1^2) x s1= (200÷100)^2 x 2 (planks) = 8 planks

Answer is8

mass=10g=10/1000=0.01kgInitial speed=u=200m/sfinal velocity= o m/sS=5cm=5/100=0.05m

From third equation of motion :V²-u²=2as

0²-(200)²=2ax0.05

-40000=ax5x2/100

-40000=a/10

a=-400000m/s²

From Newton's Second law:F=ma=0.01x(-400000)=-4000N

∴ A force of 4000N acts in opposite direction.

Force, F = rate of change of momentum

F = P/t

where P is change of momentum in time t

or F = 25/0.050 = 500 N

thanks

A+B = C , also theirs magnitudes are summing to C

so, A and B are parallel to each other.. that can be added directly.

assuming that the coefficient of kinetic friction between the block and horizontal surface of0.25

a)-2a because block b is pulled up from both sides of it's pully.

I don't noooooòooooo

Combination pliersare multi-purposepliers, combining gripping jaws with wire cutters. They can beusedfor gripping, compressing, bending, twisting, extracting and cutting various materials. They areusedin many different industries, as well as by hobbyists and DIYers.

refractive index=1/sin(critical angle)hencesin(c)=1/refractive index=1/√2hencec=45°--critical angle