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ANSWER:

Given :

An engine has been provided.

To FIND:

The VALUE of RANGE of efficiency of that engine.

Concept:

Efficiency of an engine refers to the delivery of work with respect to the amount of Heat SUPPLIED from the source.

It is denoted as η.

Let sink temperature be T1 , source temperature be T2

Now , conventionally sink temperature is always less than that of source temperature.

In that case , T1/T2 is a proper fraction.

Hence , if we do subtraction of that value from 1 , it's obvious that value of η will be less than one.

This is the mathematical proof.

Logical Proof:

Any thermodynamic machine will never be able to convert 100% supplied energy to work. This is because , it always loses. some quantity of energy to the surroundings.

So final answer :

Let us look at the answer:

EXPLANATION:

Three resistors of 3, 4 and 5 ohms are joined in parallel.

the net equivalent resistance 1/R= 1/3 + 1/4 + 1/5 = 20+15+12/60 ⇒ R = 60/47

In parallel ARRANGEMENT, voltage is same and the current is DIFFERENT for each resistor.

For 4 ohms, V = IR = 150×10⁻³ × 4 = 600 × 10⁻³ = 0.6 V

For 3 ohm resistor, I = V/R = 0.6 / 3 = 0.2 A

For 5 ohm resistor, I = V/R = 0.6/ 5 = 1.2 A

EXPLANATION:

SHOUT OUT TO KING AP

2.54

Given:

i = (5T + 2) A

t =1

To FIND:

potential DIFFERENCE = V =?

Explanation:

The potential difference is the electric potential between two points.

This potential difference is given by

where L is inductance in Henry & it constant.

∴

  V = 5L V

So V is proportional to time.

∴ At t  = 1, V = 5L V

ANSWER:

C 9 m/ s

Explanation:

u=0

g=10 m/s square

t= 0.9sec

v=u+gt

v=0+10×0.9

v=0+9

v=9 m/ s

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Explanation:

✅✅N2 (g) + 3H2 (g) ====》 2NH3 (g)

( total moles of gaseous reactant) > ( total moles of gaseous PRODUCTS)

:: ( Disordered state of gaseous reactant) > ( Disordered state of gaseous products) .

In the reaction, 4 mole of gaseous reactant from 2 moles of gaseous products, I.e, DELTA n > 0.

Therefore disorder DECREASES & HENCE entropy decreases delta S < 0..

✔For isothermal process;

=delta E = delta H - delta nRT

= -92.38 - ( -2×8.31×298 / 1000)

-92,38 + 4.95

-87.43 KJ...

✔✔ other methods.

delta ng = 2.4 = -2

delta H = delta U + delta ngRT

delta U = delta H - delta ngR

== - 92.38 × 1000 - (-2) × 8.314 × 298

== - 87.424KJ....

....

EXPLANATION:

जीव विज्ञान का पिता ग्रीक दार्शनिक अरस्तू (३८४-३२२ ई. पू.) को कहा जाता है। जीवविज्ञान का एक क्रमबद्ध ज्ञान के रूप में विकास उन्हीं के काल में हुआ।

ANSWER:

STORM is a PRINCIPAL of WINDMILL.

ANSWER:

v/f and fo/pvt

I HOPE it will HELP you

ANSWER:

The CHARGE on Q2 and Q3 =3×

EXPLANATION:

By charge  CONSERVATION: 4×=1.0× +Q2

since C2 and C3 are connected in series ,so they will  have same charge

∴Q2 = Q3

Q3 =3×

ANSWER:

i+r=150°

i=r

2i=150

i=75

Answer = 75°

Explanation:

Given Depth of well is 5.5 m and REFRACTIVE index of water is 1.33, if viewed from top by how MUCH height would the bottom of well appear to be shifted up

•  We KNOW that Refractive index of water = APPARENT depth / Real depth
•     So Real depth = Apparent depth / Refractive index of water
•    = 5.5 / 1.33
•      = 4.13 m
• Now the bottom of well appear to be shifted distance will be
• 5.5 – 4.13 = .1.37 m

Reference link will be

brainly.in/question/13532664

Answer:

Dentists use CONCAVE mirror to see LARGE images of the teeth. Large concave mirrors are used to concentrate sunlight to produce heat in solar FURNACES. Convex mirrors are commonly used as rear view mirrors in VEHICLES because they always give an errect image and have wider field of view as they are curved outwards.

Sorry bro I don't KNOW the answer

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ANSWER:

there are 2 TYPES of charges

POSITIVE CHARGE

negative charge

Answer:

The weight measured can be defined as the FORCE which the body APPLIES in the downward DIRECTION.

Answer:

There are three RESISTORS of resistances 2 Ω, 3 Ω, and 6 Ω respectively.

(a) If we connect the given three resistors in the following way then we get net resistance as 4Ω



Here, 6 Ω and 3 Ω resistors are CONNECTED in parallel.

Therefore, their EQUIVALENT resistance will be given by

⇒R=2 Ω

This equivalent RESISTOR of resistance 2Ω is connected to a 2Ω resistor in series.

Therefore, equivalent resistance of the circuit = 2Ω + 2Ω =4Ω

Hence, the total resistance of the circuit is 4Ω.

(b) If we connect the given three resistors in the following way then we get net resistance as 1Ω. Here all the resistors are connected in parallel

∴ their equivalent resistance will be given as

R=1Ω

Therefore, the net equivalent resistance of the circuit is 1Ω.

ANSWER:

USING concave mirror, a needle and a METER ROD

EXPLANATION:

it's VALUE is 2k^

PLEASE MARK AS BRAINIEST

:

VELOCITY is a MEASURE of how FAST something moves in a PARTICULAR direction. To DEFINE it needs both magnitude and direction.

Answer:

The basic principle of a generator is to convert motion into electricity. PROVIDING this motion REQUIRES that either a MAGNETIC field is generated and a wire COIL is rotated WITHIN it, or a magnetic field is rotated within a stationary coil.

Answer:

0.2 N

Explanation:

Given :

Mass = 0.4 kg

In FIRST case :

u = 0 m / sec

t = 20 sec

We have :

v = u + a t

v = 0 + 20 a

v = 20 a .

For second case :

v become initial velocity :

u = 20 a

t' = 10 sec

s = 100 m

We have :

s = u t + 1 / 2 a t²

100 = 20 a × 10 + 1 / 2 × a × 10²

1 = 2 a + a / 2

a = 0.5 m / sec²

We know :

F = m a

F = 0.4 × 0.5 N

F = 0.2 N

Explanation:

NEGATIVE CHARGE flows in it when it is connected by in an ELECTRIC circuit

what do you WANT to SAY??

Answer:

Two conducting wires of the same material and of equal LENGTHS and equal DIAMETER are first connected in series and then parallel in a circuit across the same potential difference. The ratio of HEAT produced in series and parallel combinations WOULD be. (a) 1:2. (b) 2:1.

Explanation:

1) Electricity chapter

2) Atmospheric refraction

3) lens and mirror diagrams and theory

4) MAGNETISM chapter

5) eye diseases EG. MYOPIA, hypermetropia, presbiopia

Do only these topics and you will GET above 90% marks.

Answer:

PLEASE MARK me as BRAINLIST and give me some POINTS

Explanation:

On this day in 1752, Benjamin FRANKLIN flies a KITE during a thunderstorm and collects AMBIENT electrical charge in a Leyden jar, enabling him to demonstrate the CONNECTION between LIGHTNING and electricity.

Answer:

TEMPERATURE

Explanation:

1) Density - therefore density of air is inversely proportional to velocity of sound (at constant temperature)

------> that is the greater the density of air the lower will be the speed of sound

2)Relative Humidity - the speed of sound increases with humidity in air ..therefore speed of sound in wet air or moist air is more than speed of sound in dry air ..

--------> so humidity directly proportional to speed of sound

3) nature of transmitting medium

3) nature of transmitting medium4) Temperature - (in gases)

v ∝√T

i.e. with increase in temperature velocity of sound in a gas increases.

5) Pressure -

Change in pressure has no effect on velocity of sound in a gas, so LONG as temperature remains constant; because ;

P/ρ = constant; as long as temperature is constant.

Note: The speed of sound in air is not affected by Amplitudes, frequency, phase, loudness, PITCH, or quality.

what are we SUPPOSED to CALCULATE.....?

EXPLANATION:

Radar is a detection system that uses RADIO waves to determine the RANGE, angle, or velocity of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and TERRAIN.

Explanation:

it's all due to anamolous behaviour of WATER here as water at the above SURFACE TURNS into Ice at 0°C but the water below it is not CONVERTED into Ice

ANSWER:

I don't KNOW SORRY ASK from GOOGLE

Question :-

Calculate the force between TWO charges each of 20 micro coulombs in a medium of relative permittivity 4. The distance between the two

charges is 40 CM .

Answer :-

To Find :-

→ Force between given charges .

SOLUTION :-

Given that :

• Charge

• distance between charges (R)= 40 cm = 0.4 m
• relative permittivity

We know that,

_________________

→ According to coulomb's law ,

→ Force is directly proportional to the product of charges and inversely proportional to the square of the distance between them.

_________________

Hence ,

Hence ,force between given charges is 5.6 N

Explanation:

The three primary health benefits of UV exposure are the production of vitamin D, improvement in mood, and INCREASED energy. Moderate exposure to UV radiation is a good source of vitamin D. This vitamin aids in the regulation of calcium metabolism, insulin secretion, blood pressure, immunity, and cell propagatio

• Damaging effects of UV light on your skin
• UV radiation can ALSO damage our skin. We know that excessive tanning outdoors and SPENDING too MUCH time on the tanning bed are responsible for increased rates of skin cancer. And UV exposure has ALREADY been identified as the main cause of skin cancer.

Answer:

I hope you can UNDERSTAND

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ANSWER:

NOTHING MAN???!!!??!???

ANSWER:

C. 125 m s

...........................

(C) 105 m s^-1

Given:

Speed of the police van vp

= 30 KM h^-1

Converting into m/sec:

= 30 x 1000 / 3600

= 25/3 ms^-1

Speed of the thief's car vt

= 192 x 5/18 ms^-1

= 160/3 ms^-1

Formula we have to use here to CALCULATE the speed of the bullet:

= Speed of police van + speed with which the bullet was actually fired

Calculating the Speed of the bullet by USING the formula:

= 25/3 + 150

= 475 / 3 ms^-1

Calculating the relative velocity of thief's car with respect to bullet:

vbt = vb - vt

Substituting the values into this formula we get:

Vbt = (475/3 - 160/3)

Vbt = 315/3

Vbt = 105 ms^-1

Therefore the speed at which the bullet hits the thief's car is 105 ms^-1. Option (C) 105 m s^-1 is the correct ANSWER.

ANSWER:

EXPLANATION:

जिस भौतिक राशि में मात्रा (परिमाण) तथा दिशा दोनो निहित होते हैं उन्हें सदिश राशि कहते हैं। सदिश राशियों के उदाहरण हैं - वेग, बल, संवेग इत्यादि। जिन राशियों में सिर्फ परिमाण होता है उन्हें अदिश राशि कहते हैं, जैसे - चाल, दूरी, द्रव्यमान

حد ہے بھگوان۔۔۔۔۔۔۔۔۔۔

ANSWER:

c

Explanation:

PLEASE FOLLOW me then I follow you

Answer:

Accha is a is a funct of I think it is the best way for me to get to the POINT that you can help me

Explanation:

I Explanation that for the most RECENT years I am not a good writer at this point and of COURSE course I am would be very interested interested in this the way I do it in

50 +87

137

Answer:

DERIVE an expression for the POTENTIAL ENERGY and K.E of a harmonic oscillator. HENCE show that total energy remains conserved in S.H.M. Answer: ... ω= 2πf where F is the frequency of oscillation and Φ is phase constant

Answer:

TRANSFORMER is a static electrical machine which transfers AC electrical power from one circuit to the other circuit at the CONSTANT frequency, but the voltage level can be altered that means voltage can be increased or decreased ACCORDING to the requirement.

It works on the principle of Faraday’s LAW of Electromagnetic Induction which states that “ the magnitude of voltage is DIRECTLY proportional to the rate of change of flux.”

transformer-circuit

Answer:

A FORCE equal to the weight of 10 g acts on a BODY of mass 0.5 kg moving with a velocity of 0.2 m/s and BRINGS it to REST. How far does the body travel before it comes to rest? A body of mass 1 kg is kept at rest. A constant force of 6N starts acting on it.

ANSWER:

ASK FULL QUESTION I don't GET your question

ANSWER:

linear

Explanation:

because it is MOVING in a STRAIGHT LINE