Explore topic-wise InterviewSolutions in .

3.ans> male: XY Female: XX4.ans> 46.6.ans> endocrine gland.

Loudness is determined by the AMPLITUDE of vibration

option b) electromagnetic force

5.7 litres.

Approximately 4.7 to 5.5 litres.

Ans :- heart

The humanheartis an organ that pumps blood throughout the body via the circulatory system, supplying oxygen and nutrients to the tissues and removing carbon dioxide and other wastes.

Theelectric flux(φ) through curved surface = ϐ E ds cos θ

φ = ϐ E ds[we know, θ = 0; cosθ = 1]

= E (2πrl)

(The surface area of the curved part is 2πrl)

Since E→and ds→are right angles to each other, the electric flux through the plane caps = 0

so, Total flux through the Gaussian surface,φ = E. (2πrl)

The net charge enclosed by Gaussian surface is,q = λl

By Gauss’s law,E (2πrl) = λl/ε0

or,E = λ / 2πε0r

WORK DONE BY THE HEART=PV

WHERE,P is pressure and V is the volume of blood being pumped.

therefore,P=hpg

here,h=height of mercury=150mm

= .15m

p=density of mercury=13.6*10^3kg/m^3

g=10m/s^2

also,V=5000 i.e, 5*10^-3m^3

now, P=W/T=hpgv/t

where,t=60

therefore, putting all these values we get,P=1.7W

THEREFORE,THE POWER OF HEART IS 1.7M

option 2 is the correct

7.97ohms

2+2 ll 6 =2.42.4+2+2+2+2=10.410.4 ll 6 =3.803.80+2+2+2+2=11.8011.80 ll 6 =3.973.97+2+2=7.977

ultra sound machines

Ultrasound machines

Ultra Sound Machines

RELATIONSHIP BETWEEN SPEED OF SOUND, WAVELENGTH, FREQUENCY :-

Speed = distance / time

V = wavelength / timeV = wavelength × 1/timeFrequency = 1/timeV = wavelength × frequency

1) Wavelength = speed / frequency

= 340 / 256= 1.32 m

2) Frequency = speed / wavelength

= 340 / 0.85= 400 HZ

In fact there are many factors justifying the need of modulation.Mainly we perform modulation in order to make baseband (message) signal compatible with the channel. Few of the factors are:

Size of the antenna

Most of the signals of our interest are of low frequency(information signals). Now we know that frequency and wavelength hold an inverse relation. So a low frequency signal will have larger values of wavelength

Now,Size of an antenna is given by the relation

Antenna size = wavelength/4 ,which will a large value

And now we don’t want a low frequency and end up with a huge antenna.Having an antenna of such large dimension is impractical. Hence we modulate baseband signal with a high frequency carrier.

2.Interference of signals from various transmitters

In order to avoid the interference of signal from different transmitters,high frequency is required which can only be achieved by modulating the base band(message signal).

In fact there are many factors justifying the need of modulation.Mainly we perform modulation in order to make baseband (message) signal compatible with the channel. Few of the factors are:

Size of the antenna

Most of the signals of our interest are of low frequency(information signals). Now we know that frequency and wavelength hold an inverse relation. So a low frequency signal will have larger values of wavelength

Now,Size of an antenna is given by the relation

Antenna size = wavelength/4 ,which will a large value

And now we don’t want a low frequency and end up with a huge antenna.Having an antenna of such large dimension is impractical. Hence we modulate baseband signal with a high frequency carrier.

2.Interference of signals from various transmitters

In order to avoid the interference of signal from different transmitters,high frequency is required which can only be achieved by modulating the base band(message signal).

Momentumcan be defined as "mass in motion." All objects have mass; so if an object is moving, then it hasmomentum- it has its mass in motion. The amount ofmomentumthat an object has is dependent upon two variables: how much stuff is moving and how fast the stuff is moving.

Therefore, therelationship betweenf and is inverse: The higher thefrequency, the shorter thewavelengthof asound wave. Thespeed of soundcan change whensoundtravels from one mediumtoanother. ... Since v = f λ v = f λ , the higher thespeedof asound, the greater itswavelengthfor a givenfrequency.

please like the solution

The amplitude of the wave determines the loudness, i.e., more the amplitude of a wave, more is the loudness produced.

The frequency of the wave determines the pitch, i.e., higher the frequency of a wave, more is its pitch and shrill is the sound.

Intensity of a particle(Photon,quantum of energy) is defined the flux of no. of particles per second(means no. of photons passing per area per time). So in the photon picture of light if no. of photons increases then intensity of light increases.

direction of flow of electric charges

This is the answer of whic questions

Wavelength is also measured in metres (m) - it is alengthafter all. The frequency, f, of a wave is the number of waves passing a point in a certain time. We normally use a time of onesecond, so this gives frequency the unithertz(Hz), since onehertzis equal to one wave persecond.

frequency is inversely proportional to the time period of wave

Absolute motionismotionthat does not depend on anything external to the moving object for its existence or specific nature. Absolutists hold that there are manymotionsthat appear the same no matter from what reference frame they are observed.

Rest and motionarerelative terms. ... If an observer is atrestin his or her own frame of reference, but he may be moving in other observer's frame of reference. So if two different observers are not atrestwith respect to each other, then they too get different results when they observe themotionorrestof a body.

unbalanced

The sum of all the forces acting on an object is the net force or resultant force. If all the forces cancel out, the resultant force is zero, else, the forces are said to be unbalanced.

unbalanced forces because if all the forces acting on a body is not a zero then it s unbalanced

Balancedforcesdo not cause a change in motion. When balancedforcesact on an object at rest, the object will not move. If you push against a wall, the wall pushes back with an equal but oppositeforce. Neither you nor the wall will move.Forcesthat cause a change in the motion of an object areunbalanced forces.

Balancedforcesdo not cause a change in motion. When balancedforcesact on an object at rest, the object will not move. If you push against a wall, the wall pushes back with an equal but oppositeforce. Neither you nor the wall will move.Forcesthat cause a change in the motion of an object areunbalanced forces.

Unbalanced forcesareforcesthat cause a change in the motion of an object. Learn more about how to identify balanced andunbalanced forcesthrough several examples and test your knowledge with quiz questions.

thanks u very much

your school building is at relative rest.

Yeah absolute temperature can be found out by both the methods. Option 3 is correct.

Balance forcesare twoforcesacting in opposite directions on an object, and equal in size. Anytime there is abalanced forceon an object, the object stays still or continues moving continues to move at the same speed and in the same direction.

What is a Balanced Force?

A force where two forces of equal size, act on a body, in opposing directions is known as a Balanced Force. In Balanced Force, a body continues to be in its position i.e. it may be continuously moving with the same speed and in the same direction or it may be still in its position.

Example of Balanced Forces-

Suppose you are pushing a wall and as expected, the wall does not move and neither do you. It means that you and the wall are exerting a balanced force on each other.

What is an Unbalanced Force?

A force where two forces acting in opposing directions on a body, are not equal in magnitude and in size, is known as an unbalanced force. In an unbalanced force, a body changes its position i.e. we can observe a moving object changing its direction, either increasing the speed or decreasing the speed and a body at rest starts to move and vice versa.

Example of Unbalanced Forces-

Practically anything that moves is a result of the exertion of unbalanced forces on it. If you kick a football and it moves from one place to another, it means that unbalanced forces are acting upon it.

Forces that are equal in size but opposite in direction are called balanced forces. Balanced forces do not cause a change inmotion. When balanced forces act on an object at rest, the object will not move. If youpushagainst a wall, the wall pushes back with an equal but opposite force

This is an example of balanced force. The force exerted by each person is equal, but they are pushing in opposite direction, in this case together. It would look something like this. Because the force that each of you is exerting is equal, the two forces cancel each other out and resulting force is zero.

Due to presence of electromagnetic forces between the nuclear particles the nuclear forces are called exchangeforces

B. Rose is correct option

Muscular force is a contact force. Whereas magnetic force is non-contact foce

Muscular ForceA mechanical force generated from the contraction of specialized cells that can contractand in most muscles, the energy is transmitted out thru the bones on pivots(joints) pulled by tendons.Example:Movable bones (arms, legs, etc.) require opposing sets of muscles. Muscles can applyforce only by contracting and opposing muscles must relax. It is possible to consciouslystrongly tense (contract) opposing muscles without motion or to relax opposing musclesat the same time.

Magnetic ForceMagnetic force is the same as gravitational and electrical forces in that no one knowstruly what it is. Magnetic force is different from gravitational and electrical forces in thatits potential and momentic energy is at the expense of an electrical field in time.The existence of a magnetic field is a necessary consequence of the laws of electrostatics,and the principles of special relativity. One of the prerequisites of special relativity isthere must be motion, and it is in effect when the observer is in motion relative to thesystem from the observer's point of view.ExampleMaglev (derived from magnetic levitation), is a system of transportation that suspends,guides and propels vehicles, predominantly trains, using magnetic levitation from a verylarge number of magnets (magnetic force)for lift and propulsion.

It's all in the balance and the weight. A longer pole provides more stability for those reasons. Think of it this way. At your now given height, if your arms were only a foot long, could you balance yourself while say walking on top of a narrow wall? or is it easier to do with your arms at their normal length? the poles are made to be flexible and not rigid so that they flex and the walker can adjust the pole while walking. Better center of gravity.

HIT THE LIKE BUTTON IF YOU ARE SATISFIED

Energy is the ability of an object to do work. Kinetic energy is the energy which an object posses due to motion. While potential energy is the energy that is stored due to its position. In terms if a helicopter is moving at 120km constant height, with a varying speed, the potential energy is the same(because it is with respect to position here height) but kinetic energy increases or decreases with speed of the helicopter.

what are you minster