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The efficiency of Carnot engine if T₁ and T₂ temperature are initial and final temperature .

η=1-T₂/T₁

condition 1 :- when η ( efficiency of engine ) = 1/6 then, 1/6 = 1 - T₂/T₁ ---------(1)

condition 2 : when temperature of sink is reduced by 65K then, η(efficiency of engine ) = 1/3 e.g, 1/3 = 1 - (T₂ - 65)/T₁ -----------(2)

solve equations (1) and (2) 2(1 - T₂/T₁) = 1 - (T₂ - 65)/T₁2 - 1 = 2T₂/T₁ - (T₂ - 65)/T₁ = (T₂ + 65)/T₁T₁ = T₂ + 65 Put it in equation (1)1/6 = 1 - T₂/(T₂ + 65)1/6 = (65)/(T₂ + 65)T₂ + 65 = 390 ⇒ T₂ = 325K or 52°C now T₁ = 390K or 117°C

Then the person is using the Convex lens.

The convex lens is used to correct the Hypermetropia (Far -sightedness)

Hypermetropia is the defect of vision in which a person sees faraway objects clearly but cannot see the nearby objects.

The image is formed behind retina in Hypermetropia.

Causes:

1) The distance between the eye lens and retina decreases on account of either shortening of eyeball or flattening of lens.

2)Weak action of ciliary muscles causes low converging power of lens.

what made him angry ❓

A normal eye has it's near point on 25 cm that means that it cannot see the object present on distance of less then 25 cm

tq

squaring both sidesv^2=2x+9v^2-9=2xhence comparing with v^2-u^2=2aSu=32a=2a=1 unit

different unit of length mass time and relation

2) mN is correct answer milli newton

Fertilizer is an inorganic substance, that is prepared in the factories

2. Fertiliser provides a specific nutrient to the soil.

3. Fertilizer has a high concentration of plant nutrients.

4. A fertiliser does not provide any humus to the soil.

Manure

1. Manure is a mixture of inorganic and organic substances, which is obtained by the decomposition of cattle dung, human waste and plant residues

2. Manure provides multiple nutrients to the soil.

3. Manure has low concentration of plant nutrients

4. Manure provides a lot of humus to the soil.

Fertilizer is an inorganic substance, that is prepared in the factories

2. Fertiliser provides a specific nutrient to the soil.

3. Fertilizer has a high concentration of plant nutrients.

4. A fertiliser does not provide any humus to the soil.

Manure

1. Manure is a mixture of inorganic and organic substances, which is obtained by the decomposition of cattle dung, human waste and plant residues

2. Manure provides multiple nutrients to the soil.

3. Manure has low concentration of plant nutrients

4. Manure provides a lot of humus to the soil.

Cathode1. The electrode at which reduction takes place2. It is negative terminal3. Negative ions are deposited as atoms by gaining electrons.

Anode 1. The electrode at which oxidation takes place.2. It is positive terminal3. Atoms are liberated as positive ions by losing electrons.

assuming you are aware of its construction

When the electron is injected through the electron gun, it passes through the control grid. The control grid controls the intensity of electron in the vacuum tube. If the control grid has high negative potential, then it allows only a few electrons to pass through it. Thus, the dim spot is produced on the lightning screen. If the negative potential on the control grid is low, then the bright spot is produced. Hence the intensity of light depends on the negative potential of the control grid.

After moving the control grid the electron beam passing through the focusing and accelerating anodes. The accelerating anodes are at a high positive potential and hence they converge the beam at a point on the screen.

After moving from the accelerating anode, the beam comes under the effect of the deflecting plates. When the deflecting plate is at zero potential, the beam produces a spot at the centre.If the voltage is applied to the vertical deflecting plate, the electron beam focuses at the upward and when the voltage is applied horizontally the spot of light will be deflected horizontally.

The following circuit diagram shows thebasic circuit of a cathode ray oscilloscope. In this, we will discuss important parts of the oscilloscope.Vertical Deflection System

The main function of this amplifier is to amplify the weak signal so that the amplified signal can produce the desired signal. To examine the input signals are penetrated to the vertical deflection plates through the input attenuator and number of amplifier stages.

Horizontal Deflection System

The vertical and horizontal system consists of horizontal amplifiers to amplify the weak input signals, but it is different to the vertical deflection system. The horizontal deflection plates are penetrated by a sweep voltage that gives a time base. By seeing the circuit diagram the sawtooth sweep generator is triggered by the synchronizing amplifier while the sweep selector switches in the internal position. So the trigger saw tooth generator gives the input to the horizontal amplifier by following the mechanism.Here we will discuss the four types of sweeps.

Recurrent Sweep

As the name, itself says that the saw tooth is respective that is a new sweep is started immodestly at the end of the previous sweep.

Triggered Sweep

Sometimes the waveform should be observed that it may not be predicted, thus the desired that the sweep circuit remains inoperative and the sweep should be initiated by the waveform under the examination. In these cases, we will use the triggered sweep.

Driven Sweep

In general, the drive sweep is used when the sweep is a free running but it is a triggered by the signal under the test.

Non-Saw Tooth Sweep

This sweep is used to find the difference between the two voltages. By using the non-sawtooth sweep we can compare the frequency of the input voltages.

Synchronization

The synchronization is done to produce the stationary pattern. The synchronization is between the sweep and the signal should measure. There are some sources of synchronization which can be selected by the synchronization selector. Which are discussed below.

Internal

In this the signal is measured by the vertical amplifier and the trigger is abstained by the signal.

External

In the external trigger, the external trigger should be present.

Line

The line trigger is produced by the power supply.

Intensity Modulation

This modulation is produced by inserting the signal between the ground and cathode. Thismodulation causesby brightening the display.

Positioning Control

By applying the small independent internal direct voltage source to the detecting plates through the potentiometer the position can be controlled and also we can control the position of the signal.

Intensity Control

The intensity has a difference by changing the grid potential with respect to the cathode

B ) is correct answer

a the correct answer

in water light will travel fastest sin I/sinR= 1.33

option D.

Scalar Quantities: The physical quantities which are specified with the magnitude or size alone are referred to as Scalar Quantities. It is one – dimensional measurement of quantity like mass or temperature. A physical quantity which has force but no direction. For example, length, speed,work, mass, density, etc.

Vector Quantities: Vector Quantities refers to those physical quantities which are characterized by the presence of both magnitudes as well as direction. It is indeed a quantity that requires both of magnitude and direction in order to identify the right quantity. For example, displacement, force, torque, momentum, acceleration, velocity, etc.

If you add aqueous barium chloride BaCl2 solution and aqueous sodium sulphate Na2SO4 solution, a precipitate of barium sulphate is formed.

BaCl2(aq) + Na2SO4(aq) → BaSO4(s) + 2NaCl(aq)

The colour of barium sulphate, like all Group 1 and Group 2 metal salts, is white as a solid or precipitate, and colourless when dissolved in water.

In general only transition metal salts have colour. For example copper (II) sulphate is blue and iron (III) hydroxide is reddish brown.

TLDR: white precipitate!

There's something called the "Impact" or the "Impulse" factor.....basically a measure of force multiplied by the time of application of force.....A bullet has very less impulse factor due to its time of contact, but has enough momentum to break the glass.......A stone on the other hand has huge momentum and has enough contact time with the glass for its force to be spread around the glass from its point of contact, thereby shattering it starting from the point of contact......

When the bullet strikes the glass pane, the part of the glass pane which comes in contact with the bullet immediately shares the large velocity of bullet and makes a hole. The remaining part of the glass remains at rest as there is no time for the other parts to share the velocity and is therefore not cracked, due to inertia of rest.

Detecting SoundWaves.Soundwaves aredetectedby the fact that the waves can cause objects to vibrate. The vibrations from thesoundwaves must be converted into a signal and then amplified and processed. Your ear and a microphone are common detectors ofsound

humidity because humidity is amount of water vapour present in the atmosphere

option c is correct of your question

option C is the correct answer

option C is the correct answer

The law of conservation of energy states that the total amount ofenergy inan isolated system remains constant over time.At a maximum height:K0 =0P0 = m * g * HAt a lowest point:K1 = m * V^2 / 2P1 = m * g *h

K0 + P0 = K1 + P1, so:m * g * H = m * V^2 / 2 + m * g * hg * H= V^2 / 2 + g * hV^2 / 2 = g * H - g * hV = sqrt(2 * g * (H - h))V =sqrt(2 * 9.81 * (5 - 2)) = 7.67 m/s

Mass of the wooden block = m= 5 kgdimensions = 40 cm × 20 cm × 10 cmthe weight of the wooden block applies a thrust on the table top.That is,Thrust = F = mg= 5 kg × 9.8 m/s²= 49 N

Area of a side = length × breadth = 20 cm × 10 cm = 200 cm² = 0.02 m²

Pressure = thrust/ areaPressure = 49 /0.02= 2450 N/m²

The same thrust in implied when it lies on the given dimension.Area= length × breadth= 40 × 20= 800= 0.08 m²

Pressure = 49/0.08= 612.5Pa

16 will be right answer

As we know that the focal length of a spherical mirror is equal to half the radius of curvature of that mirror.

So, according to your question the radius of curvature of a convex mirror is 32cm.

And hence, the focal length would be>

■32÷2■16 cm.

So the focal length of the convex mirror is 16cm.

_____________________________________________

Hope helped!!

focal length F = R/2F = 32/2F = 16 cm. ANS....

16 cm is the correct answer

16cm is the correct answer

16 cm is correct answer

16 cm is the correct answer of the given question

f=ŕ/2=32/2=16........

KinematicsKinematics is the study of the motion of objects without concern for the forces causing the motion. These familiar equations allow students to analyze and predict the motion of objects, and students will continue to use these equations throughout their study of physics. A solid understanding of these equations and how to employ them to solve problems is essential for success in physics. This article is a purely mathematical exercise designed to provide a quick review of how the kinematics equations are derived using algebra.

Case1: Projectile projectected parallel to horizontal :

Motion along x axis: x= u t ...... (1)

Motion along y axis, y = g t²/2 ......(2)

Putting value oftfrom (1) into (2)

We get, y = g x²/2u² ......(3)

This represents a parabola.

Case 2: When projectile is given angular projection:

Let the projectile makes angle β with horizontal and is projected with velocity u.

Ux = u cos β and Uy =u sinβ

Ax (acceleration along x axis) = 0

Ay = - g (acceleration along y axis)

Now, motion along x axis, X = u cosβ t ......(1)

And motion along y axis, Y = u sinβ t - gt²/2 ...(2)

Putting value oftffrom (1) into (2)

We get Y = X tanβ - g X²/2u²ccos²β

This represents a parabola. Hence the projectile follows the parabolic path.

We know, dimension of energy is, [E] = [M1L2T-2]

Dimension of mass is [m] = [M1L0T0]

Dimension of velocity is [v] = [M0L1T--1]

Suppose,

[E] = k [m]x[v]y

‘k’ is a proportionality constant which is a dimensionless quantity.

Therefore,

[M1L2T-2] = [M1L0T0]x[M0L1T--1]y

=> [M1L2T-2] = [MxLyT-y]

Thus, x = 1, y = 2

So, we have, E = k mv2

It is found that, k = ½

So, E = ½ mv2

We know, dimension of energy is, [E] = [M1L2T-2]

Dimension of mass is [m] = [M1L0T0]

Dimension of velocity is [v] = [M0L1T--1]

Suppose,

[E] = k [m]x[v]y

‘k’ is a proportionality constant which is a dimensionless quantity.

Therefore,

[M1L2T-2] = [M1L0T0]x[M0L1T--1]y

=> [M1L2T-2] = [MxLyT-y]

Thus, x = 1, y = 2

So, we have, E = k mv2

It is found that, k = ½

So, E = ½ mv2

Derived.

We know, dimension of energy is, [E] = [M1L2T-2]

Dimension of mass is [m] = [M1L0T0]

Dimension of velocity is [v] = [M0L1T--1]

Suppose,

[E] = k [m]x[v]y

‘k’ is a proportionality constant which is a dimensionless quantity.

Therefore,

[M1L2T-2] = [M1L0T0]x[M0L1T--1]y

=> [M1L2T-2] = [MxLyT-y]

Thus, x = 1, y = 2

So, we have, E = k mv2

It is found that, k = ½

So, E = ½ mv2

Derived.

Heat energy produced = power * time duration = I² R t = V² t / R

H = I^k R^m T^n

Let us try to find the dimensions of current in known units.Force = charge * electric field = current * time * voltage /distance current = Force * distance / (time * voltage) = force * distance/(time * current * resistance) I = M L T⁻² * L / (T * I * R) = M L² T⁻³ I⁻¹ R⁻¹ I² = M L² T⁻³ R⁻¹ I = M^1/2 L T^-3/2 R^-1/2

M L² T⁻² R^0 = energy = I^k R^m T^n = M^k/2 L^k T^-3k/2 R^-k/2 * R^m * T^n Equating the powers of the units : k = 2 n = 1 m = 1

Hence, H = I^2 R T

speed = 60km/hrTime (t1)= 1hr , time(t2)=30min= 30/60= 1/2 hr

Distance travelled by a car in East direction(s1)= speed× t1 = 60× 1= 60km

Distance travelled by a car in south direction(s2)= speed× t1 = 60×1/2= 30 km

Displacement from intial position(s)= √(s1)²+(s²)²= √ (60)²+(30)²= √3600+900= √900(4+1)= 30√5 Displacement= 30√5km

The photon is a type of elementary particle, the quantum of the electromagnetic field including electromagnetic radiation such as light, and the force carrier for the electromagnetic force. The photon has zero rest mass and always moves at the speed of light within a vacuum.

define photon light ?

In physics, aphotonis a bundle of electromagnetic energy. It is the basic unit that makes up alllight. Thephotonis sometimes referred to as a "quantum" of electromagnetic energy.Photonsare not thought to be made up of smaller particles. They are a basic unit of nature called an elementary particle.

what is one photon?

Photonenergy is the energy carried by a singlephoton. The amount of energy is directly proportional to thephoton'selectromagnetic frequency and inversely proportional to the wavelength. ... Equivalently, the longer thephoton'swavelength, the lower its energy.

In case of movement of a charge particle, magnetic field is created around the path. Since alpha particle is positively charged.So magnetic field would be created.

In case of movement of a charged particle the magnetic field is created around the path on which the charged particle moves.

(i) Yes, a thin beam of a-particles (which are positively charged) is like straight conductor carrying current in the direction of motion.

(ii) No, as neutrons carry no charge so no magnetic field would be created around its path.

force= 1/4πEo × 2e*2e /(3.2*10^-15)^2

In case of movement of a charged particle the magnetic field is created around the path on which the charged particle moves.

(i) Yes, a thin beam of a-particles (which are positively charged) is like straight conductor carrying current in the direction of motion.

(ii) No, as neutrons carry no charge so no magnetic field would be created around its path

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V river = 5m/min

V man = 10 m/minsuppose width of river is x mts

Case 1

if he travels due north

then his resultant velocty ( due to velocity of downstream of water) acts 30 north of east and the distane to be covered to reach the other bank increses to = x/cos 30

i.e., 2x /31/2 and resultant velocity is 11.2 m/min

so time taken is x / 9.7 mins

Case 2

if he travels due 30 north of east

then his resultant velocty ( due to velocity of downstream of water) actsdue north and the distane to be covered to reach the other bank will be x mts and resultant velocity is 8.7 m/min

so time taken is x / 8.7 mins

So case 1 takes least time

he should travel due north(a)

what is the real answer

B) is correct answer

Ans :- In electromagnetism,displacement currentis a quantity appearing in Maxwell's equations that is defined in terms of the rate of change of electricdisplacement field.Displacement currenthas the units of electriccurrentdensity, and it has an associated magnetic field just as actual currents do.

When youpushthere is one component of force that adds to the weight of the body and hence there is more friction. When youpullthe vertical component of force is against the weight of body and hence there is less overall friction. Soit is easy to pull than pushan object.