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Projectile motionis a form ofmotionexperienced by an object or particle (aprojectile) that is thrown near the Earth's surface and moves along a curved path under the action of gravity only (in particular, the effects of air resistance are assumed to be negligible).

When cooled from room temperature liquid water becomes increasingly dense, as with other substances, but atapproximately 4 °C(39 °F), pure water reaches its maximum density. As it is cooled further, it expands to become less

4°CHydrogen bondingis the reason why water has its maximum density at 4°C. The thermal energy (Kinetic Energy) of water is high enough that Hydrogen bonds cannot hold the molecules for long. They get knocked around by other molecules and this energy imparted is enough to break the hydrogen bonds between Oxygen atom of one molecule and Hydrogen atom of another molecule. Hence, water as it is being cooled follows the general fact of contracting as it is being cooled.

a correct answer is (d) mgR/3

Radioactivity is the spontaneous emission of energy from unstable atoms. As you know atoms are found in all matter. There are stable atoms, which remain the same always, and unstable atoms, which break down or 'decay' into new atoms. These unstable atoms are said to be 'radioactive', because they emit radioactivity from the nucleus as they decay. The phenomenon of radioactivity is observed in heavy elements such as uranium. Antoine Henri Becquerel, a French scientist discovered radioactivity in 1896 by chance while performing an experiment. So radioactivity refers to the particles which are emitted from nuclei as a result of nuclear instability.

The subatomic particles ejected naturally in radioactivity are present inside the nucleus no oxidation or other such physical process can affect the phenomenon since they change the outer electron and not the nucleus so radioactivity can only be called a nuclear phenomenon

Alpha, beta and gamma decay are a result of the three fundamental forces working in the nucleus – the 'strong' force, the 'weak' force and the electromagnetic force. In all three cases, the emission of radiation increases the nucleus's stability, by adjusting its proton : neutron ratio.

(B) velocity of a particle

the motion which circulate from our body is caller oscillactory motion

when an object goes from A point to B point and b to a point is called oscillatory motion

Oscillatory motion. ...Oscillatory motioncan be termed as the repeatedmotionin which an object repeats the samemovementover and over.

yes it is write as repeated motion

Linearspeed andangular velocityare two different concepts. Withlinearspeed,v, the object is deemed to progress along a straight line. Withangular velocity, ,the object moves in circularmotionand the angle it moves through as it goes around the circle, radius,r. is itangular velocity

converts linear motion into rotatory motion

the motion take place when the restoring force acting on the body is directly proportional to it's displacement from it's equilibrium position, oscillatory motion eventually comes to rest due to damping Or fraction forces.

Ans :- TechnologicalObjectives: Design and realisation of a Mars orbiter with a capability to survive and perform Earth bound manoeuvres, cruise phase of 300 days, Mars orbit insertion /capture, and on-orbit phase around Mars. Deep space communication, navigation, missionplanningand management.

electron,proton and neutron

Four requirements of good units are given as follows:

1) A good unit should be correct. The basic requirement of unit is to measure correct parameter of different physical quantities. Thus, it should be correct.

2) A good unit should be clear. The units of measurement should be clear, precise and and simple.

3) A good unit should be testable. The units should be testable because all the physical concept are based on experiments.

4) A good unit should be feasible. The good unit should be practically and easily available.

the nature of the flow will be turbulent.

could say the reason

option A is the right answer

Wow this is a great question

the correct answer is c

As diode is in forward biasso i1= 0now i2= 10/16kohm= 5ma

form 1 and 2 L.HS= R.H.S

(ii)

As diode is in forward biasRESISTANCE across will be 0so no current will flowso i1= 0and i 2= 5maso Option D is right

the answer is 72 N because F=mass *velocity

the answer of this question is 72N

Insulators such as plastic, rubber etc.

it's basically a light emitting diode

light-emitting diode (LED) is a semiconductor light source that emits light when current flows through it. ... Infrared LEDs are used in remote-control circuits, such as those used with a wide variety of consumer electronics.

light emitting diode

the full form of LED is Light Emitting Diode.

Light emitting diode

LED is Light Emitting Diode .

light emitting diode

light emitting diod is the correct answer

light emmiting diode is a semiconductor which emits light when any current will be pass through itthese are used in traffic light,, remote of our led lcd and tv

..

A light-emitting diode (LED) is a semiconductor light source that emits light when current flows through it. Electrons in the semiconductor recombine with electron holes, releasing energy in the form of photons

light emitting diode

A light emitting diode (LED) is a semiconductor light source that emits light when current flows through it.

Refraction is a change on the direction of the light when pass from a medium to another one.Refraction is the bending of a wave when it enters a medium where its speed is different. The refraction of light when it passes from a fast medium to a slow medium bends the light ray toward the normal to the boundary between the two media. The amount of bending depends on theindices of refractionof the two media and is described quantitatively bySnell's Law

The important pattern types in casting:

Solid or single piece pattern.

Split pattern or two piece pattern.

Multi-piece pattern.

Cope and dragpattern.

Match plate pattern.

Gated pattern.

Skeleton pattern.

sweep pattern sand casting.

First Round Table Conference (November 1930 – January 1931) The Round Table Conference officially inaugurated by His Majesty George V on November 12, 1930 in Royal Gallery House of Lords at London and chaired by the British Prime Minister, Ramsay MacDonald.

The Beer-Lambert law states that the quantity of light absorbed by a substance dissolved in a fully transmitting solvent is directly proportional to the concentration of the substance and the path length of the light through the solution.

Because Beer's law states this, it means we can both calculate the concentration of a solution by using the absorbancies, or plot a graph of various concentrations, align them to their correct absorbencies, and use a colorimeter to find the concentration of an unknown solution

The law states that:

A(λ) =e(λ)lc.The proportionality constante(λ) is called the absorptivity of the substance at the wavelengthλ.e(λ) is called the molar absorptivity if the concentration is measured in moles/liter.

The absorbance is inversely proportional to the transmittence of the solution

bro just google it....for best results

bro just google it....for best results

First find the perimeter of the rectangular plotHenceperimeter=2(l+b)=2(500+300)=2*800=1600mHence one round=1600metre2 hours 20mins=2*60+20=120+20=140minutesHence speed=distance/timespeed=1600/140=11.42m/minHence distance in 7 hours7hours=7*60=420minutesHence distance =speed*time=420*11.42=4796.4metres

thanks bro

Measurement Error

Definition:The measurement error is defined as the difference between the true or actual value and the measured value. The true value is the average of the infinite number of measurements, and the measured value is the precise value.

Types of Errors in Measurement

The error may arise from thedifferent source and are usually classified into the following types. These types are

Gross Errors

Systematic Errors

Random Errors

1. Gross Errors

The gross error occurs because of the human mistakes. For examples consider the person using the instruments takes the wrong reading, or they can record the incorrect data. Such type of error comes under the gross error. The gross error can only be avoided by taking the reading carefully.

For example –The experimenter reads the 31.5ºC reading while the actual reading is 21.5Cº. This happens because of the oversights. The experimenter takes the wrong reading and because of which the error occurs in the measurement.

Such type of error is very common in the measurement. The complete elimination of such type of error is not possible. Some of the gross error easily detected by the experimenter but some of them are difficult to find. Two methods can remove the gross error.

Two methods can remove the gross error. These methods are

The reading should be taken very carefully.

Two or more readings should be taken of the measurement quantity. The readings are taken by the different experimenter and at a different point for removing the error.

2. Systematic Errors

The systematic errors are mainly classified into three categories.

Instrumental Errors

Environmental Errors

Observational Errors

2 (i) Instrumental Errors

These errors mainly arise due to the three main reasons.

(a) Inherent Shortcomings of Instruments –Such types of errors are inbuilt in instruments because of their mechanical structure. They may be due to manufacturing, calibration or operation of the device. These errors may cause the error to read too low or too high.

For example – If the instrument uses the weak spring then it gives the high value of measuring quantity. The error occurs in the instrument because of the friction or hysteresis loss.

(b) Misuse of Instrument –The error occurs in the instrument because of the fault of the operator. A good instrument used in an unintelligent way may give an enormous result.

For example – the misuse of the instrument may cause the failure to adjust the zero of instruments, poor initial adjustment, using lead to too high resistance. These improper practices may not cause permanent damage to the instrument, but all the same, they cause errors.

(c) Loading Effect – It is the most common type of error which is caused by the instrument in measurement work. For example, when the voltmeter is connected to the high resistance circuit it gives a misleading reading, and when it is connected to the low resistance circuit, it gives the dependable reading. This means the voltmeter has a loading effect on the circuit.

The error caused by the loading effect can be overcome by using the meters intelligently. For example, when measuring a low resistance by the ammeter-voltmeter method, a voltmeter having a very high value of resistance should be used.

2 (ii) Environmental Errors

These errors are due to the external condition of the measuring devices. Such types of errors mainly occur due to the effect of temperature, pressure, humidity, dust, vibration or because of the magnetic or electrostatic field. The corrective measures employed to eliminate or to reduce these undesirable effects are

The arrangement should be made to keep the conditions as constant as possible.

Using the equipment which is free from these effects.

By using the techniques which eliminate the effect of these disturbances.

By applying the computed corrections.

2 (iii) Observational Errors

Such types of errors are due to the wrong observation of the reading. There are many sources of observational error. For example, the pointer of a voltmeter resets slightly above the surface of the scale. Thus an erroroccurs(because of parallax) unless the line of vision of the observer is exactly above the pointer. To minimise the parallax error highly accurate meters are provided with mirrored scales.

3. Random Errors

The error which is caused by the sudden change in the atmospheric condition, such type of error is called random error. These types of error remain even after the removal of the systematic error. Hence such type of error is also called residual error.

Errors are normally classified in three categories: systematic errors, random errors, and blunders. Systematic errors are due to identified causes and can, in principle, be eliminated. Errors of this type result in measured values that are consistently too high or consistently too low.

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A fluorescent bulb produces less heat, so it is much more efficient. This makes fluorescent bulbs four to six times more efficient than incandescent bulbs. That's why you can buy a 15-watt fluorescent bulb that produces the same amount of light as a 60-watt incandescent bulb.