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Incline of one in 10 means that in moving 20 m he reached a height of H= 2 m.

Total weight of man and block = 75kg

Thus work done is: mgH

75*9.8*2 = 1470J

S = u^2 / (2a)

Same car will cause same retardation (a) in both cases.

∴ S ∝ u^2

S1 / S2 = (u1 / u2)^2S2 = S1 * (u2 / u1)^2S2 = 8 * (60 / 30)^2S2 = 32 m

It will come to rest after 32 m

Mass of man(m1) = 60kg Initial velocity of man (u1)= 18 km/h=18x5/18=5m/sFinal velocity of man (v1)= (v2) = vMass of car (m2)= 100kgInitial velocity of car (u2) = 0 (as it is in rest)Final velocity of car (v2) = vAccording to law of conservation of momentum,m1u1 +m2u2 = m1v1 + m2v260x5 + 100x0 = 60xv + 100xv300+0 = 160vv = 300/160v = 1.875 m/s

The force experienced by aunitpositive charge placed at that point is termed as theelectric field intensity. The SIunitofelectric field intensity= NC–1.

Electric fieldat any equatorial point of a dipole is given by, At the mid-point of the dipole, r = 0.

The rails Bend due to thermal expansion and thetraingoes off therailway trackto avoid. ... and Ted eachrailis connected to the other. in such a way that asmall gapis left inbetweenthem. thesesmall gapsprovidespacefor easy mention of therailwhich happens during summer as well.

Thanks so much for

c) is correct answer

a) 30 j is the right answer

D) 20 j is the correct answer

(c) is right answer like my answer

given data:v = 8m = 3kgt = 2 secondsu = 0

by using 1st equation of motion, we will find acceleration firstlyv = u+at8 = 0+2aa = 4 m/s^2

force = mass×accelerationforce = 4×3 = 12N

F=ma=5*8/120=40/120=0.33N

Given:mass=5kg,u=0,v=8m/s,t=2min=120sAs F=maBy first equation of motion v=u+at8=0+a.120(. means multi)8/120=a As F=maF=2.8/120

since initially acceleration is +ve and constant so, speed will increase continuously...so displacement will also be increasing but with increasing slope ( slope = velocity)

and when acceleration will be -ve.. the speed will reduce... so, displacement will increase but slowly.. and then when speed is completely 0. the object stops.

so, option A. is correct.

explain plz.

thanku

f= 50 cm R = f/2= 50/ 225 ans

Stress = F/A

=> when A→2A

F should be twice → 2F

option 2

answer is opt. 3

breaking force of wire is F . breaking force of single wire i.e. F of double thickness i.e.2 will be breaking force =2F

but i think option 2 is fair enough.. check your answer again.

umm...ansr is 4F.... i have checked it again

F 1= (k x q1 x q2)/r^2

F2= (k x q1 x q2)/ (2r)^2

F2= (k x q1 x q2)/ 4r^2

Therefore

F1 / F2= 1/1/4

Therefore: F2= F1/4

option 3

C =eo *A/(d-t + t/k)

C =eo *A/ (d- 3d/4 + 3d/4k)

C = (4k/k+3) (eo *A /d)

C = (4k/k+3) * Co

post a clear image

unable to understand

The magnetic permeability is defined as the property of the material to allow the magnetic line of force to pass through it.

We know self inductance L= Magnetic flux / I .. given plot is of magnetic flux versus I . Therefore the slope will be equal to L (self inductance) . Since slope of A is more than B => A has higher value of self inductance.

Option d ) is correct.

please explain it

What is reflection?

Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated. Common examples include the reflection of light, sound and water waves.

Do you know how sound propagates?

Sound propagates through air as a longitudinal wave. The speed of sound is determined by the properties of the air, and not by the frequency or amplitude of the sound. If a sound is not absorbed or transmitted when it strikes a surface, it is reflected. The law for reflection is the same as that of light, ie., the angle ofincidenceof a sound waveequals the angle of reflection, just as if it were produced by a 'mirror image' of the stimulus on the opposite side of the surface.

How do we describe the reflection of sound?

When sound travels in a given medium, it strikes the surface of another medium andbounces back in some other direction, this phenomenon is called the reflection of sound. The waves are called the incident and reflected sound waves.

What are incident and reflected sound waves?

The sound waves that travel towards the reflecting surface are called the incident sound waves. The sound waves bouncing back from the reflecting surface are called reflected sound waves. For all practical purposes, the point of incidence and the point of reflection are the same point on the reflecting surface.

A perpendicular drawn on the point of incidence is called the normal. The angle which the incident sound waves makes with the normal is called the angle of incidence, "i". The angle which the reflected sound waves makes with the normal is called the angle of reflection, "r".

Let’s look at the two laws of reflection

The following two laws of reflection of light are applicable to sound waves as well:

The incident wave, the normal to the reflecting surface and the reflected wave at the point of incidence lie in the same plane.

The angle of incidence ∠i is equal to the angle of reflection∠r.

Learning Outcomes

Student will understand the First and Second Laws of Reflection.

First Law of Reflection:The incident wave, the reflected wave, and the normal at the point of incidence lie on the same plane.Law of Reflection:The angle of incidence is equal to the angle of reflection.

Transistor as Oscillator

When we use atransistorin a circuit, it continuously produces undamped oscillations at the output terminals of the circuit. Here we can explain you how touse a transistor as an oscillator with the help of circuit diagram.

Oscillator circuit:

The diagram ofTransistor oscillator circuitis shown below. This circuit is divided into three sections:

(i) Tank Circuit:This circuit produces oscillations which are amplified by the transistor and produces amplified output in the collector side.

(ii) Amplifier circuit:This circuit basically amplifying the small sinusoidal oscillations present in the base-emitter circuit and generates output in the amplified form.

(iii) Feedback circuit:This is the important section of the circuit because to amplify the oscillations for the amplifier we need some energy at the tank circuit. For this purpose, we fed back the energy of the collector circuit to the base circuit through the phenomenon ofMutual induction. We fed back the energy from output to input with the help of this circuit.

Here assertionand reason both are correctas energy states the gap result finite curvature

Realistic means aim of the person should be achievable. He should set a realistic goal and accept the challenges that lie ahead with enthusiasm. It should be within the capacity of the individual, neither too high nor too low.

Indirectbandgap semiconductor the electron “rising” from valence band to the conduction band will only change it’s potential(energy).

Inindirectbandgap semiconductor the electron “rising” from valence band to the conduction band will change it’s potential (energy) andmomentum

Ans :- n-type Semi-Conductor

It is an extrinsic semi-conductor which is obtained by doping the impurity atoms of Vth group of the periodic table to the pure Ge and Si semi-conductor.

The impurity atoms added, provide extra electrons in the structure and are called donor atoms.

The electrons are majority carriers and holes are minority carriers.

The electrons density (ne) is much greater than the hole density (nh) i.e.>> nh.

The donor energy level is close to the conduction band and for away from the valence band.

The Fermi-energy level lies in between the donor energy level and conduction band.

P-type Semi-Conductor

It is an extrinsic semi-conductor which is obtained by doping the impurity atoms of III group of the periodic table to the pure Ge and Si semi-conductor.

The impurity atoms added, create vaccines of electrons (i.e. holes) in the structure and are called acceptor atoms.

The holes are majority carriers and electrons are minority carriers.

The holes density (nh) is much greater than the electrons density (ne) i.e.>> ne.

The acceptor energy level is close to the Valence band and for away from the Conduction band.

The Fermi-energy level lies in between the acceptor energy level and valence band.

Let total moles of mixture be 100gMoles of CO2 = 66gThen hydrogen will be = 34gNumber of moles of CO2=66/44=1.5Numbsr of moles if H2=34/2=17Total moles =1.5+17=18.5Formula to be used:Mavg= Total mass/ total moles= 100/18.5=5.40VAPOUR DENSITY= MAvg/2=5.40/2=2.70So, VAPOUR density of mixture is 2.7

Anintrinsic semiconductoris an undopedsemiconductor. Thismeansthat holes in the valence band are vacancies created by electrons that have been thermally excited to the conduction band, as opposed to doped semiconductorswhere holes or electrons are supplied by a “foreign” atom acting as an impurity.

Anextrinsic semiconductoris asemiconductordoped by a specific impurity which is able to deeply modify its electrical properties, making it suitable for electronic applications (diodes, transistors, etc.) or optoelectronic applications (light emitters and detectors).

Heat capacityia heat required to raise​ the temperature of a substance by 1 degree Celsius.

Specific heatis heat required to raise the temperature of a unit mass of a substance by 1 degree Celsius.

On the other hand heat capacitydepends on mass of the substance. If I have 5kg of that substance then heat capacity will be 5KJ/Kg, if I have 10kg then heat capacity becomes 10KJ/kg . Because more the mass, more it will take to raise the temperature by 1 degree Celsius.

thank you

thanks too much

3) is the correct answer

(3)is the write answer

(3)230k is right answer babes

Solar Cell does not need any reverse bias for its operations.

Ultraviolet rays and x rays can be used.