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branch of SCIENCE dealing with rest/motion of BODY is called mechanics


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I THINK d all of the.rest

A, to provide an adequate supply of air for the fuel COMBUSTION.
b, to EXHAUST the GASSES of combustion from the combustion CHAMBER.

Let FRICTION constant is u.

so friction FORCE opposite ti direction of APPLIED force =uw where w is weight of body in Newton.

so minimum force required=uw N

Cathode ray tubes emit electrons from a negatively CHARGED METAL electron emitter (the "cathode"). These are accelerated to high speeds by a voltage difference between the cathode and the positively charged anode, shaped around where the electron beam goes. The beam is steered side-to-side either by charged plates or magnetic fields. In an analog oscilloscope, these are electrostatic plates because they are faster than the steering magnet coils which are used in the picture tubes of television sets. These days, fancy oscilloscopes have digital memories and can display the image to the screen at a slower speed than the original SIGNAL came in, allowing the use of ordinary computer MONITORS instead of specially DESIGNED high-speed imaging tubes. 

The vacuum in the oscilloscope's picture tube is needed to keep the electrons in the beam from being scattered by gas molecules which would blur and dim the image on the screen. Electrons are very light and have a large charge, and so they feel strong forces when they travel past any gas molecules because of all of the electrons and protons in the molecules. Whenever an electron comes close to a gas molecule, it would be bent off course. All picture tubes have vacuum inside, and they would perform badly if they ever developed a leak.

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The Quantum Theory of Radiations by Max Planck can explain the photoelectric effect very WELL. Max Planck says that light is made of bundles of energy known as photons, energy of each photon being equal to hγ, γ being the frequency of the light. So when a photon of frequency being equal to the THRESHOLD frequency of the METAL strikes the metal surface, it imparts its whole energy to an electron and hence helps the electron to overcome the forces of attraction from the nucleus of the atom. In this way an electron is ejected out of a metal surface when a photon strikes it. If the frequency of the photon is less that γ0 (threshold frequency), then no photoelectric effect is observed.

But if γ>γ0 , then some of its energy (which is equal to the ionization energy) is CONSUMED in ejecting the electron from the metal and the remaining is used to impart some kinetic energy to the ejected electron.

Hγ= Ф + (½)mv2

Here, Ф is the ionization energy, v is the velocity imparted to the ejected electron, m is the mass of the electron.

As Ф=hγ0 , hγ= hγ0 + (½)mv2

Rearranging,  (½)mv2 = h (γ-γ0)………….(1)

Equation (1) is called Einstein photoelectric equation.

Wavelength is inversely proportional to FREQUENCY, THEREFORE radio waves have the longest WAVELENGTHS and GAMMA rays have the shortest. Example VALUE for gamma wavelength: 10−12m.

The equation for KINETIC energy is this:

Kinetic energy is the amount of energy a object has when it's MOVING. Potential energy is the opposite, potential energy is the amount of energy a object has when it's at REST. (or not moving)

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Its MEAN there is a RETARDATION is APPLYING on the OBJECT..

I THINK the ANSWER to your question is pressure in pipes CHANNEL.

The main difference is between potential difference(voltage) and electromotive force.

Electromotive force

The Electromotive force (e) or e.m.f. is the energy provided by a cell or BATTERY per coulomb of CHARGE passing through it, it is measured in volts (V). It is the potential difference across the terminals of the cell when no current is flowing(open circuited)It remains constant.EMF is the cause.

Potential difference:

It is the amount of work to be done to move a unit positive charge from ONE point to another point. It is also measured in volts(V).Potential difference does not remains constant.Potential difference is the result.

Here is a simple explanation:

When we say EMF of a device is 5 V it MEANS the device supplies the energy 5 V Joules to each coulomb of charge.When we say potential difference between point A and B is 5 V it means each coulomb of charge will GIVE up an energy of 5 V Joules in moving from A to B.

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To explain the difference between the two consider the magnets below:MAGNET A is smaller than magnet B. They both have the same “MAGNETISM”, that is the same AMOUNT of total flux. As A has a smaller surface area than B it has a much HIGHER “magneticstrength” or magnetic flux density

Recovery voltage is the voltage at the TERMINAL of CB, after the circuit interruption. Restriking voltage is what APPEARS ACROSS the contacts at CURRENT zero during arc period & will have higher frequency. ... [Define Restriking Voltage.

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Speed of REHMAN = 8 km/h

Speed of ROMA = 13 km/h

time of traveling = 36 MIN = 36/60 h = 0.6 h

So, DISTANCE travelled by Rehman

= 8×0.6 = 4.8 km

Distance travelled by Roma

= 13×0.6 = 7.8 km

So, as they both are travelling to each other

so, NET distance between them = 4.8 + 7.8

= 12.6 km.

Inertia is the inherent PROPERTY of BODY to maintain the state of MOTION, REST




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This is frictional force.

when we suddenly STOPS ,we put our legs on land and SLIP. then the frictional force decelerate us by ACTING opposite to our direction.

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In order to improve the FULL power efficiency of thee previous Class A amplifier by REDUCING the wasted power in the form of HEAT, it is possible to DESIGN the power amplifier circuitwith two transistors in its output stage producing what is commonly termed as a Class B amplifier also known aspush- pull amplifier ...

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Semiconductors show dramatic quantization effects when CHARGE carriers (electrons and holes) are confined by potential barriers to small regions of space where the dimensions of the confinement are less than the de Broglie wavelength of the charge carriers, or EQUIVALENTLY, the nanocrystal diameter is less than twice the Bohr radius of excitons in the bulk material. The length scale at which these effects begin to occur in semiconductors is less than about 25 to 10 nm depending UPON effective masses. When the charge carriers are …

Gravity decreses because by increasing DEPTH EFFECTIVE mass of the EARTH decreses ...
And there fore gravity decreases with increasing depth ...
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P-type semiconductors are created by doping an intrinsic semiconductor with ACCEPTOR impurities. A COMMON p-typedopant for silicon is boron or gallium. For p-type semiconductors the Fermi level is below the intrinsic Fermi level and LIES closer to the valence band than THECONDUCTION band.

Given:

t = 100s,

s = 1000m;

V = 10m/s.

But this is the RELATIVE speed with respect to the bus

To Find:

speed of the scooterist so that he should move so as to overtake the bus in 100 s.

Solution:

Vs - actual VELOCITY of speed of the the scooterist so that he should move so as to overtake the bus in 100 s;

Vb = velocity of bus;

v = relative velocity of SCOOTER with respect to bus.

v = Vs-Vb as both busand scooter are MOVING in same direction.

10 = Vs-10;

10 + 10 = vs

20 = vs

So,

Vs = 20m/s

Momentum = MASS × VELOCITY
=2000×18
= 36000


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Cavitation is CAUSED by

(d). LOW PRESSURE

It means when you add more RESISTANCE to the rotor then the toque increases ALONG with the slip where as CURRENT REDUCED. Wound rotorinduction motor is best suited EXAMPLE for high starting torque with less inrush current. ... slip ring induction motor has high starting torque thansquirrel cage induction motor

In a roller coaster potential energy as WELL as KINETIC energy KEEP CHANGING because the roller coasters moving it changes is white so potential energy change and it also changes its speed by rotating so kinetic energy also GET changed

hot air has low DENSITY in consider to COOL air.

so cool air will come down to the surface.

the HEATER generates hot air that will go up,so it is put down so that the room will warm.

similarly ac is fitted on TOP ,so its cool air will come down and cool the room.

38c.....................

Energy is measured in JOULES.
its dimension is 【ML2T-2】

but DIMENSIONAL FORMULA of j/sec is 【ML2T-3】.

as dimensional formula is different,the UNIT is not for Energy.

this is unit for POWER.

Twisted-pair

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SEX Is the RESULTANT VECTOR

The CORRECT ANSWER is....
TOTAL displacement = A-B
in triangle ABC,
AC= 20m
BC= (30root2 - 30) m = 12.42m
total displacement,
AB^2 = AC^2 + CB^2
AB^2 = 400 + 154.25
AB = 23.542514.