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option(1) is correct

it is the same as that of timehence it will be M0L0T

A/B=Force/Force [M^o L^o T^o ]

ct = angle

C = angle/time=1/T=T^(-1)

Dx = angle

D = angle/distance=1/L = L–1

C/D=T^(-1)/L^(-1) =[M^o LT^(-1) ]

When a body is under load, it will extend in the direction of the stress (longitudinal strain) and contract in the transverse or lateral direction (lateralstrain), in case oflongitudinaltensile stress.

Thevolumetric strainis the unit change involume, i.e. the change involumedivided by the originalvolume.

shear strain is defined as the tangent of the angle, and is equal to the length of deformation at its maximum divided by the perpendicular length in the plane of force application,

This means stress is newtons per square meter, or N/m2. However, stress has its own SI unit, called the pascal. 1 pascal (symbol Pa) is equal to1 N/m2

Strain (injury), an injury to a muscle (tear in tendon) in which the muscle fibers tear as a result of over-stretching. Strain (mechanics), a geometrical measure of deformation representing the relative displacement between particles in a material body.

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remains constant

efficiency = power output /power input efficiency = 10*1000/((200)^2/0.2)=10,000/200,000=0.05=5%

100-5=95 may be correct answer

remains constant

constant

Stress is force per unit area.The strain is the deformation of the material because of stress in the material.Young's modulus is the ratio of normal stress to normal strain within the range of elastic limits.

Hooke's Law

It states that within the limit of elasticity, the stress induced (σ ) in the solid due to some external force is always in proportion with the strain (ε ). In other words the force causing stress in a solid is directly proportional to the solid's deformation. Consider a spring with a spring constantkthat is stretched with a forceFextends to a distancexwith reference to the initial position.

Force required for deformationxis given by

F=-k.x

Plot the graph for the stress (σ) versus strain (ε) for a metal rod acted upon by trending tensile force.

The answer is option B.

Viscosityis a measure of a fluid's resistance to flow. It describes the internal friction of a moving fluid. A fluidwith largeviscosityresists motion because its molecular makeup gives it a lot of internal friction.

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The photovoltaic effect is the creation of voltage and electric current in a material upon exposure to light and is a physical and chemical phenomenon.[1]

The photovoltaic effect is closely related to the photoelectric effect. In either case, light is absorbed, causing excitation of an electron or other charge carrier to a higher-energy state. The main distinction is that the term photoelectric effect is now usually used when the electron is ejected out of the material (usually into a vacuum) and photovoltaic effect used when the excited charge carrier is still contained within the material. In either case, an electric potential (or voltage) is produced by the separation of charges, and the light has to have a sufficient energy to overcome the potential barrier for excitation. The physical essence of the difference is usually that photoelectric emission separates the charges by ballistic conduction and photovoltaic emission separates them by diffusion, but some "hot carrier" photovoltaic device concepts blur this distinction.

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We know that resistivity = m / (nte^2)

m and e are properties of electrons and remain constant.

METALSIn metals, n i.e., the number of electrons in unit volume of the conductor is almost independent of temperature. However, t i.e., the relaxation time does vary with temperature. When temperature increases, the thermal speed of the electrons increases as well as, the amplitude of vibration of the positive ions inside the metal conductor also increase, about their mean positions. Thus, the collisions between the electrons and the positive metal ions become more frequent and this decreases the relaxation time, t, leading to an increase in the resistivity of the conductor.

Also, the temperature coefficient of metals is positive.

SEMI-CONDUCTORSThe number of free electrons in a unit volume of the semi-conductor increases exponentially with an increase in the temperature. This more than compensates the small decrease in t, the relaxation time. Also, the temperature coefficient is negative. Thus the resistivity decreases with a temperature increase in semi-conductors.

ELECTROLYTESAs temperature increases, the inter-ionic bonds weaken a well as the viscous decrease. Thus the ions can move more freely. Thus the resistivity decreases with an increase in temperature in electrolytes. The temperature coefficient is negative here.

ALLOYSFor alloys, resistivity is very high.The resistivity of nichrome has a very low temperature dependence. The resistivity of manganin is almost independent of temperature. At 0 K temperature, while metals have almost null resistivity, alloys still, have some residual resistivity.

The basic unit of electriccharge, equal to the quantity ofchargetransferred inonesecond by a steady current ofoneampere, and equivalent to 6.2415 × 1018elementarycharges, whereoneelementarychargeis thechargeof a proton or the negative of thechargeof an electron.

Thespeed of soundisaffectedby temperature andhumidity. Because it is less dense,soundpasses through hot air faster than it passes through cold air. Dry air absorbs far more acoustical energy thandoesmoist air.

Projectile Motion

Projectile motion is a form of motion where an object moves in a bilaterally symmetrical, parabolic path. The path that the object follows is called its trajectory. Projectile motion only occurs when there is one force applied at the beginning on the trajectory, after which the only interference is from gravity. In a previous atom we discussed what the various components of an object in projectile motion are. In this atom we will discuss the basic equations that go along with them in the special case in which the projectile initial positions are null (i.e.x0=0x0=0andy0=0y0=0).

Absolute humidityis the measure of water vapor (moisture) in the air, regardless of temperature. It is expressed as grams ofmoistureper cubic meter of air (g/m3). The maximumabsolute humidityof warm air at 30°C/86°F is approximately 30g of water vapor - 30g/m3

ओम के नियम (Ohm's Law) के अनुसार यदि ताप आदि भौतिक अवस्थायें नियत रखीं जाए तो किसी प्रतिरोधक (या, अन्य ओह्मीय डिवाइस) के सिरों के बीच उत्पन्न विभवान्तर उससे प्रवाहित धारा के समानुपाती होता है।

अर्थात्

V ∝ Iया,R का एक मात्रक ओम (ohm) है।

वास्तव में 'ओम का नियम' कोई नियम नहीं है बल्कि यह ऐसी वस्तुओं के 'प्रतिरोध' को परिभाषित करता है जिनको अब 'ओमीय प्रतिरोध' कहते हैं। दूसरे शब्दों में यह उन वस्तुओं के उस गुण को रेखांकित करता है जिनका V-I वैशिष्ट्य एक सरल रेखा होती है। ज्ञातव्य है कि वैद्युत अभियांत्रिकी एवं इलेक्ट्रानिक्स में प्रयुक्त बहुत सी युक्तियाँ ओम के नियम का पालन नहीं करती हैं। ऐसी युक्तियों को अनओमीय युक्तियाँ कहते हैं। उदाहरण के लिये, डायोड एक अनओमीय युक्ति है।

option (d) is correct.

why pressure is not a vector

We can put the walls of our container anywhere inside the gas, and the force per unit area (thepressure) is the same. ... Therefore,pressure is a scalar quantity, not avector quantity. It has magnitude but no direction sense associated with it.Pressureforce acts in all directions at a point inside a gas.

The ability of the eye to change its focus from distant to near objects (and vice versa). Accommodation is the adjustment of the optics of the eye to keep an object in focus on the retina as its distance from the eye varies. It is the process of adjusting the focal length of a lens.

in last equation it is u instead of t

Air cools when it rises through the atmosphere because as altitude increases, air pressure decreases and allows the individual air molecules to expand away from each other. This expansion leads to a decrease in collisions between air molecules, which then results in less heat energy being transferred between those molecules

d will be the answerbecause due to the pressure difference

tum sir

Option b is correct as:-

Woollen clothes keep us warmduring winterbecause woolis a poor conductor ofheatand it has air trapped in between the fibres.

thnx

No the measure of angle is not dependent on unit of length , because if we extend the two rays which make up the angle, the measure of angle won't change.

unable to understand

pls post clear image

please post clear image

please post clear image

Option 2 is the correct answer.

MULTIPLY ANSWER- [1]1399564936.[2]1483394616.[3]7106997100.[4]25265792398.[5]410315417087.

divide answers=[1]=4,328.85610200364 [3]=8,892.75360900416 [5]=4,892 [2] and[5] not visible

multiply answers (1)1,399,564,936(3)7,110,989,795(2)1,483,394,616(4)19,629,392,398(5)410,315,417,087

Heating is the technique by which we can prepare colloidal solution of starch in water