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b.when we lift an object 2 forces acts on it these are: (I) muscular force and (II) gravitational force a. positive work is done by the muscular force because thedisplacement is in the direction of the muscular force .b. negative work is down by the gravitational force because displacement is in the opposite direction to which the gravitational force is acting ...

Gravity changes at height h and under ground x.As g = GM/R2When R changes then g also changes.Now gh= g(1-2h/R)and gx= g(1-x/R)When ghand gxare same then gh =gxor g(1-2h/R)​ =g(1-x/R)​So 2h/R=x/R​So 2h = x

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Length of train = 100 m =.1 kmLet velocity of train is vTime taken = 7.2 sec = 7.2/3600

Distance = speed x time .1 = (v + 5)7.2/3600v + 5 = 3600/72 v + 5 = 50v = 45 km/hr

Velocity of train = 45km/hr

X component= 4cos30°= 4(√3/2)=2√3

Y component= 4sin30°= 4(1/2)=2

Hence, option (1) is correct.

The parts of a vector resolved into vertical and horizontal vector are rectangular components. Rectangular components are perpendicular to each other. ... From figure (1), it represents a resultant vector on point . Through point O, it separates two components in X and Y direction axis

Change in area = Original Area* change in temperature* coefficient of area expansion= 4*30*34*(10^-6)= 408*(10^-5) m²

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there should be j cap in A vector and there should also be k cap in B vector so how to find them?

magnitude of F = √(6)²+(8)²+(10)² = √36+64+100 = √100+100 = 10√2

so, mass of body = F/m = 10√2/1 = 10√2 kg

The most common classes of materials used include:

Kanthal (FeCrAl) wires.

Cupronickel (CuNi) alloys forlow temperatureheating.

The heat that is generated because of the current flow in an electric wire is described in Joules. The mathematical expression of Joule’s law is as explained below.The joule’s first law shows the relationship between heat produced by a flowingelectric currentthrough a conductor.

Q = I2R T

Where,

Qindicates amount of heat,

Ishows electric current

Ris the amount of electric resistance in conductor

Tdenotes time

It is measured in watts per degree Kelvin.

In imperial units,thermal conductivityis measured in BTU/(hr⋅ft⋅°F). Thedimensionofthermal conductivityis M1L1T−3Θ−1, expressed in terms of thedimensionsmass (M), length (L), time (T), and temperature (Θ).

The SI derived unit forpressureis the pascal. 1 cm Hg is equal to 1333.2239 pascal.

plese convert cm to Pascal

Pascal-secondis a dynamic viscosity measurement unit. Apascal-second(Pa. · s) is a derived metric SI (System International) measurement unit of dynamic viscosity.

I think it's d is correct

Thepascal(symbol: Pa) is the SI derived unit of pressure used to quantify internal pressure, stress, Young's modulus and ultimate tensile strength.

It isdefinedasonenewton per square metre. It is named after the French polymath BlaisePascal.

1 pascal=1 × 10-5bar

Pascal's law is a principle in fluid mechanics that states that a pressure change occurring anywhere in a confined incompressible fluid is transmitted throughout the fluid such that the same change occurs everywhere. The law was established by French mathematician Blaise Pascal in 1647–48.

thanks bro

force,direction

they aren't the two factors.... the certified answer says it's distance and current

mol/l is the unit of molarity

Ans :- Molarity(M) is defined as the number of moles of solute per liter ofsolution. Molality(m) is defined as the number of moles of solute per kilogram of solvent. When water is the solvent and the concentration of thesolutionis low, these differencescan be negligible (d = 1.00 g/mL).

Let the two vectors be (ai^+bj^+ck^) & (pi^+qj^+rk^)Then,(ai^+bj^+ck^) - (pi^+qj^+rk^)= (a-p)i^ + (b-q)j^ + (c-k)k^For this to be an unit vector, EITHER two of (a-p), (b-q) or (c-r) have to be zero. For the sake of simplicity, I take (b-q) and (c-r) to be zero.Therefore, b=q and c=r, giving us vectors ai^+bj^+ck^ and pi^+bj^+ck^,Therefore, angle between them is,∆ = arc(cos[(ap + b^2 + c^2)/{√(a^2 + b^2 + c^2)√(p^2 + b^2 + c^2)}])

If b=c=q=r=0,Angle ∆ = arc(cos(ap/ap))= arc(cos 1)= 0°

The reason you feel weightless is because there is no force pushing against you, since you are not in contact with anything. Gravity is pulling equally on all the particles in your body. This creates a sensation where no forces are acting on you and you feel weightless. It would be the same sensation as if you were floating in space.

1)dSound waves need to travel through a medium such as solids, liquids and gases. The sound waves move through each of these mediums by vibrating the molecules in the matter. The molecules in solids are packed very tightly. Liquids are not packed as tightly. And gases are very loosely packed. This enables sound to travel much faster through a solid than a gas.

2)cThe voice of an adult man is of lower pitch in comparison to the voices of a baby boy, a baby girl and a woman. Since frequency of a sound is directly proportional to its pitch, man’s voice is of minimum frequency in comparison to a boy, a girl, or awoman’s voice

1.d(solid,liquids and gases)2.c

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GeneralCharacteristicsofAcids:

pH < 7.

Sour taste (though you should never use thischaracteristicto identifyan acidin the lab)

Reacts withametal to form hydrogen gas.

Increases the H+ concentration in water.

Donates H+ ions.

Turns blue litmus indicator red.

mirror is concave and nature of image is virtual and erect

c option is right for this

84.6 min= 84.6/60 hr=1.41 hr

the answer is thermometer

Tq

Clinical thermometer write hai didi tumhara

When surfaces in contact move relative to each other, the friction between the two surfaces converts kinetic energy into thermal energy (that is, it converts work to heat). This property can have dramatic consequences, as illustrated by the use of friction created by rubbing pieces of wood together to start a fire.

Ariction is a type of dissipative force that always opposes the relative motion between any two objects (Note : this relative motion occurs between the surfaces in contact of the two objects) so it would decrease the kinetic energy (as it is opposing in nature) only if no external force is applied (equivalent to the value of frictional force) in the direction of motion (i.e. opposite to the direction of friction).

Mostelectrical wireiscoveredin a rubber orplasticcoating called insulation. The purpose of insulationcoveringthe metal part of anelectrical wireis to prevent accidental contact with other conductors ofelectricity, which might result in an unintentionalelectriccurrent through those other conductors

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Most electricalwireiscoveredin arubberorplasticcoating called insulation. ... Thepurposeof insulationcoveringthe metal part of an electricalwireis to prevent accidental contact with other conductors of electricity, which might result in an unintentional electric current through those other conductors.