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In thermodynamics and engineering, a heat engine is a system that converts heat or thermal energy—and chemical energy—to mechanical energy, which can then be used to do mechanical work. It does this by bringing a working substance from a higher state temperature to a lower state temperature

In thermodynamics and engineering, a heat engine is a system that converts heat or thermal energy—and chemical energy—to mechanical energy, which can then be used to do mechanical work. The mechanical work often involves powering a generator which converts the mechanical energy to electrical energy.

Given y = A(sinwt +coswt)

multiply and divide with √2 on the R.H.S => y = A√2(sinwt/√2 +coswt/√2) => y = A√2 ( sin(wt +π/4) ...... ( 1/√2 = sinπ/4=cosπ/4)

so, the equation becomes

y = A√2sin(wt+π/4)

so, here the amplitude is A√2.

option D.

why you divide and multiply the equation by under root 2

because you have to add sin and cos function , to represent S.H.M in only one function..

so, √2 is multiplied and divided to convert

sinwt + coswt into sin function only.

Mouth mirror used by a dentist is a concave mirror, to get a magnified reflection of the mouth, without inverting the reflection image. A convex lens if used would provide a real image, which means would need a screen to form the image - all within the small space of a human mouth.

Concave mirrors, when viewed from closer than their focal length, make the reflected object appear larger.

Shaving in a concave mirror allows a person to see fine details including any remaining hairs or stubble that remains to be shaved.

A heat engine typically uses energy provided in the form ofheatto doworkand then exhausts the heat which cannot be used to do work. Thefirst lawandsecond law of thermodynamicsconstrain the operation of a heat engine. The first law is the application of conservation of energy to the system, and the second sets limits on the possible efficiency of the machine and determines the direction of energy flow.

The law of reflection says that the angle of incidence is equal to the angle of reflection. Or in less technical language, the angle at which light hits a surface (angle of incidence) is equal to the angle at which light bounces away from the surface (angle of reflection)Please like the solution 👍 ✔️👍

Magnetic FieldPatterndue toaCircular Loop Carrying Current. Themagnetic fieldlines are concentric circles at every point of acurrent carrying circular loop. ... The direction ofmagnetic field at the centreofcircular coilis perpendicular to the place of thecoil. i.e. along the axis of thecoil.

B= idlsin theeta/r^2 by combination of all these

Arefrigeratoris a reversedheat engine. ... Aheatpump is similar to arefrigerator.

The work done during isothermal expansion is given asW = 2.303nRT.ln(Vf/ Vi)so,ln(Vf/ Vi) = W / 2.303nRTor ratio will be given as(Vf/ Vi) = exp[W / 2.303nRT]here,Vf= final volumeVi= initial volumen = 5R = 8.314 J/KmolT = 100C = 373Kand W = 420Jthus,(Vf/ Vi) = exp[420 / (2.303 x 5 x 8.314 x 373)]or(Vf/ Vi) = exp[(420 / 7141.883)]thus(Vf/ Vi) = 1.059

set bro u r in 8 n we have not been taught Maxwell's law

The direction of the magnetic field can be changed by changing the direction of the current. If a circular coil is carrying current in a clockwise direction then the direction of the magnetic field created at the centre of the coil will be inside the plane. And in a coil carrying current in an anti-clockwise direction will have the direction of the magnetic field outside the plan, at the centre of the coil.

Answer: Another form of the Second Law of Thermodynamics or Carnot's Principle is that : It is not possible to make aheat enginewhose only effect is to absorbheatfrom a high-temperature region and turn all that heatinto work. ... Or, it is not possible todesign a heat enginethat has an efficiencyof 1.00 or100%

The second law of thermodynamics puts a fundamental limit on the thermalefficiencyof all heatengines. Even an ideal, frictionlessenginecan't convert anywhere near100% of its input heat into work. ... No device converting heat into mechanical energy, regardless of its construction, can exceed thisefficiency.

We know ƞ = 1 – T2/T1

On increasing the temperature of the sink (T2), the efficiency of the Carnot engine will decrease

When the waves propagates near to the surface, the waves glide over the surface of the earth, they are called ground waves. The maximum range of coverage depends on the transmitted power and frequency.

(d) The magnetic field inside a long straight current-carrying solenoid is uniform which is represented by parallel lines. Hence it is same at all points.

The magnetic field inside a long straight current-carrying solenoid is uniform which is represented by parallel lines. Hence it is same at all points.

It is maximum at the mid of the solenoid and minimum (half of the maximum value) at the end .

what will be the answer

L = N*(φ/I)and φ = B/A so L= NB/AI => I = BN/AL , option C.

answer will be option d

work done = nRTln(Vf/vi) = 1*R*T*ln(2v/v) = RTln2 L-atm

Thetwo magnetic field linesdo notintersecteach other because if they do it means at the point ofintersectthe compass needle is showingtwodifferent directions which is not possible.

Charge on one electron = 1.6022 × 10–19 coulombCharge on one mole of electron = (1.6022 × 10–19 C) (6.022 × 1023)= 9.65 × 104 C

Magnetic lines of forcehave a number of importantproperties, which include:

They seek the path of least resistance between oppositemagneticpoles.

In a single barmagnetas shown to the right, they attempt to form closed loops from pole to pole. They never cross one another.

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tank you

V=250v

i=0.4A

r=v/i

r=250/0.4

r=2500/4

resistance=625 ohm

p=vi

v=250v ,i=0.4a

p=(250*0.4)w=100w

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V=2.5 VI=750mA= 750x10⁻³Apower =p=?Power =V*I =2.5x750x10⁻³=1.875Wreistance :V=IRR=V/I=2.5/750x10⁻³=3.3 ohmsEnergy consumed if bulb is lighted for 4 hours :E=p*t=1.875x4=7.500Wh=27x 10³joules

I am not sure about the answer of this question...

option c is correct but not sure

Least count of voltmwter always is 0.5 volt

The reading shown by voltmeter is 1.8 volt as each division measures 0.15volt

The current flowing through the resistor of 20 ohm is approx 0.09amp

Since V is directly proportional to R in series thereforereading will be 230/240×12=23/2V=11.5V

Since V is directly proportional to R in series thereforereading will be 230/240×12=23/2V=11.5V

thanx

Magnetic field strength

Explanation:Oersted (symbol Oe) is the unit of magnetic field strength |H|.