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Derive equation of motion of a projectile .also find (a )time of flight (b) maximum height (c) horizontal range.

Posted by Rahul Kr 6 years, 9 months ago

1 answers

Macherla Indupriya 6 years, 9 months ago

a) s=ut+1/2 at^2 0= Vsin(V not sin teta )T+1/2(-g)T^2 0=Vsin teta T-1/2gT^2 1/2gT^2=Vsin teta T 1/2gT= Vsin teta T= 2Vsin teta /g b)v^2-u^2= 2as v=0,u=vsinteta,a=-g,s=Hmax 0-v^2sin^2teta=-2gHmax v^2 sin^2 teta=2gHmax v^2 sin^2 teta/2g=Hmax c)R= (VnotCos teta)T R=( VnotCos teta)2vnot sin teta/g R=Vnot^2 sin^2teta/g.

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what is a numerical value of joule

Posted by Suryadev Pratap 6 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Shivendra Rajawat 6 years, 9 months ago

1*10^7 erg

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What do you mean principle of a refrigerator (or heat pump)?

Posted by Suraj Dj 6 years, 9 months ago

CBSE > Class 11 > Physics

0 answers

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State the conditions under which a force does no work.

Posted by Ankit Saini 6 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Nikhita V 6 years, 9 months ago

When the force produces 0 displacement and when the displacement is perpendicular to the force applied

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What is SONAR

Posted by Fara Aziz 6 years, 9 months ago

CBSE > Class 11 > Physics

2 answers

Tripti Shah 6 years, 9 months ago

And it works on the priciple of Echo.

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Vaibhav Yadav 6 years, 9 months ago

Sound navigation and ranging . Used by ships to detct objects in oceans or sea

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Which fundamental law forms the basis of equation of continuity?

Posted by Kartikey Pal 6 years, 9 months ago

CBSE > Class 11 > Physics

2 answers

Shivam Srivastav 6 years, 9 months ago

Conservation of mass

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Shubham Jana 6 years, 9 months ago

K=AV

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Find the value of cv cp and x for a monsanetric and diamonatric concentrating translation motion alone

Posted by Mahek Saini 6 years, 9 months ago

CBSE > Class 11 > Physics

0 answers

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Calculate the total number of electrons present in 100gm of water. Also find the total charge

Posted by Rajnish Singh 6 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Ankit Kumar 6 years, 9 months ago

we know that 1 molecule of water have (1*2+8=10) electrons.

no. of water molecules in 18gm of water is equal to avogadro number ie., 6.022*10²³ H₂O molecules.

100gm = 100*6.022*10²³ / 18

we got no of molecules in 100 gm is 100*6.022*10²³/ 18 H2O molecules.

thus number of electrons in 100gm of water ie., 100*6.022*10²³/18 H2O molecules is = 100*6.022*10²³*10/18 = 334.55*10²³ electrons

charge on each electron is -1.9*10^-19 coulomb

total charge = 334.55*10²³*(-1.9*10^-19);

total charge = 635.65*10⁴ Coulomb.

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What are theApplications of elastic behaviour of materials?

Posted by Swathee Kumar 6 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Ankit Kumar 6 years, 9 months ago

Following are the applications of elastic behaviour of materials as:

1. Shock Absorber in machinery items as well as in automobiles.

2. Bridges and columns are constructed by considering the elastic behaviour of material as per load capacity.

3. Every development or manufacturing is done by considering the elastic behaviour of material according to the applying load.

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Ask questions

Posted by Sudarshan Sharma 6 years, 9 months ago

CBSE > Class 11 > Physics

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A ladder is leaned against a smooth wall and along a frictionless floor what is the trajectory of its centre of mass when the ladder slips

Posted by Shreya Sharma 6 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Sudarshan Sharma 6 years, 9 months ago

Straight line

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Cp- cv=r derive

Posted by Prachi Singh 6 years, 9 months ago

CBSE > Class 11 > Physics

2 answers

Vinay Kumar 6 years, 9 months ago

It is Mayer's equation. Derivation: ΔU = ΔQ + ΔW ΔU = Cv ΔT (At pressure is constant) ΔQ = Cp ΔT (At pressure is constant) ΔW = -P ΔV (Negative since the calculation been complete) Pv = RT (1 mole of gas) Because of pressure is constant, R is also constant Change in V will make change in T PΔV = R ΔT Cv ΔT = CpΔT - RΔT Divided by ΔT Cv = Cp - R Cp - Cv = R

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Priyal Bansal 6 years, 9 months ago

U=q-w nr∆t=ncp∆t - ncv∆t r=cp-cv ( n and ∆t will be cancelled out)

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Derive an expression for excess pressure inside a liquid bubble?

Posted by Prachi Singh 6 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Ankit Kumar 6 years, 9 months ago

let us consider a hollow bubble of radius 'r' and internal diameter 'd' and thickness 't'.

let s= surface tension;

P= pressure intensity inside liquid bubble;

d= internal diameter of the bubble;

t= thickness;

let us cut the soap bubble into two halves

tensile force acting along the surface( inner and outer) circumferential of the cutting portion and is given by

F=s*3.14*d+s*3.14*(d+t)

as t<<d;

so d+t=d

so F = s*3.14*d+s*3.14*d;

F= 2*3.14*s*d;................................eq. 1

pressure force due to pressure intensity is given by

F= P*3.14*d²/4..........................................eq. 2

under equilibrium condition equating eq. 1 aand eq. 2

we get

2*3.14*s*d=P*3.14*d²/4

P=8*s/d.......................Answer

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Bernoulli's theorem explain

Posted by Vinay Kumar 6 years, 9 months ago

CBSE > Class 11 > Physics

2 answers

😜Arnav Arya🙃 6 years, 9 months ago

The sum of pressure energy kinetic energy potential energy per unit volume of a incompressible non viscous fluid for a streamlined irrotational flow is constant along a streamline P+1/2¶v2+¶gh = constant

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Nikhita V 6 years, 9 months ago

Sum of potential energy, kinetic energy and pressure energy is always constant. 1/2 mv^2 + mgh + mP/'rho' = k

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Write a newton law of cooling

Posted by Vinay Kumar 6 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Shatayu Ganvir 6 years, 9 months ago

The rate of loss of heat is directly proportional to temperature diffrence between two bodies

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State law of equipartition of energy ?

Posted by Rahul_ Ry(ʘ‿ʘ) 6 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Priya Singh 6 years, 9 months ago

Equipartition of energy, law of statistical mechanics stating that, in a system in thermal equilibrium, on the average, an equal amount of energy will be associated with each independent energy state.

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A crawl running over the wire gives it degree of freedom?

Posted by Sneh Singh 6 years, 9 months ago

CBSE > Class 11 > Physics

0 answers

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What is angle of contact?

Posted by Abhishek Kala 6 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Nancy Rajput 6 years, 9 months ago

Angle of contact is the angle which is tangent to a liquid surface at the point of contact makes with the solid surface inside the liquid.

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A projectile is fired at an angle theta with the vertical derive the expression for maximum height attained time of flight and horizontal range prove that for two angle of projection theta 90 - theta with same velocity U range is cm and height is in the ratio of 10 square theta is 21

Posted by Saurabh Mahli 6 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

????Shubham Sihag?????? 6 years, 9 months ago

Time of flight: It is the total time for which the projectile remains in air. We know, at the end of time of flight, the projectile reaches the point on the ground. So, vertical height gained by the y = 0. From vertical equation of motion, we have: y=(usinθ)T–12gT2 Now, 0=(usinθ)T–12gT2 ∴T=2usinθg…….(i) Equation (i) gives the time of flight of the projectile for velocity of projection u at an angle θ. Horizontal range: The total distance covered by the body in projectile is called horizontal range. Horizontal range = Horizontal component of velocity × time of flight or,R=ucosθ×2usinθg or,R=u2sin2θg Maximum horizontal range: The horizontal range will be maximum when sin2θ is maximum. i.e.,sin2θor,2θor,θ=1=sin90o=90o=45o Maximum Height: The vertical component of velocity at maximum height is 0. So, V2y0H=(usinθ)2–2gH=u2sinθ−2gH=u2sin2θ2g Two angle of projections for the same range: The range R for velocity of projection u and angle of projection θ is: R=u2sin2θg If (90-θ) be the another angle of projection, then: R2∴R1=R2=u2sin2(90–θ)g=u2sin(180–2θ)g=u2sin2θg

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Important topics in physics....please help me

Posted by Prometheus ? 6 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Shatayu Ganvir 6 years, 9 months ago

All

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Show stress - strain curve for brittle material

Posted by Priya Banik 6 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Shatayu Ganvir 6 years, 9 months ago

Yield stress and neck formation is very early formed

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Definition for banking of roads.

Posted by Macherla Indupriya 6 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Nikhita V 6 years, 9 months ago

When the road is made isn't plane but slightly titled by some angle either to the right side or left side, it is called banking of roads

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What is strokes law?

Posted by Abhishek Kala 6 years, 9 months ago

CBSE > Class 11 > Physics

4 answers

😜Arnav Arya🙃 6 years, 9 months ago

According to Stokes law the backward viscous force acting on a small spherical body of radius R are moving with a uniform velocity V through fluid of viscosity neta is given by :- F =6nπrv

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Nancy Rajput 6 years, 9 months ago

It is a law that predicts the frictional force on a spherical body falling through a viscous medium (like oil), under the influence of gravity. We have, F=6pie ×n× r×v Where r=radius of the falling sphere, v= instantaneous velocity and n Is the viscosity of the medium The sphere accelerates until it reaches a steady terminal speed, i.e., when F is equal to the gravitational force on the sphere.

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Macherla Indupriya 6 years, 9 months ago

The viscous drag force (f) on the sphere of radius (r) moving with the velocity(v) through the fluid of viscocity(n) is F=6πnrv

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Yogita Ingle 6 years, 9 months ago

The force that retards a sphere moving through a viscous fluid is directly ∝to the velocity and the radius of the sphere, and the viscosity of the fluid.
Mathematically:-F =6πηrv where
Let retarding force F∝v where v =velocity of the sphere
F ∝ r where r=radius of the sphere
F∝η where η=coefficient of viscosity
6π=constant
Stokes law is applicable only to laminar flow of liquids.It is not applicable to turbulent law.

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The displacement of particle varies y= -⅔t² + 16t + 2.. How long does particle take to come to rest??

Posted by Sagar Pandya 6 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Nikhita V 6 years, 9 months ago

dy/dt will give you the velocity. Since the particle is at rest, that equation would be equal to 0. Solve it to get the value of t

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is there any chapter of class 12 added in class 11 physics ?

Posted by Rikshesh Dhiman 6 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Lavanya ❤️? 6 years, 9 months ago

Yes..ray optics is added

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Please solve this question..... A ball is thrown vertically upwards direction attains max. height of 16 m. At what height would be its velocity half of the initial velocity????

Posted by Sagar Pandya 6 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Ankit Kumar 6 years, 9 months ago

we have the equation

V² = U² - 2*g*h;

as V= U/2;

so putting the value of V in above equation

(U/2)²=U²-2*g*h

2*g*h= U² - (U/2)²

2*g*h= 3*U²/4;

h=3*U²/(8*g)........................................eq. 1

now we have to calculate the value of U;

if H is the total height;

then accroding to v²=U²-2*g*H;

v=0;

we get

U² = 2*g*H

U²= 2*9.81*16;

U= 17.69 m/s

so required height can be calculated form equation 1 as h= 11.96 m

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When a body accelerates by @t, what is the velocity after time 't', when it starts from rest?

Posted by Sanchit Kumar Dhiman 6 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Ankit Kumar 6 years, 9 months ago

according to v = u +a*t

as the body starts fro rest so

u = 0

so final velocity v after t time is

v= a*t

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What is Le -chatelies principle??

Posted by Tripti Shah 6 years, 9 months ago

CBSE > Class 11 > Physics

2 answers

Tripti Shah 6 years, 9 months ago

Thanku gitanjali

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?????Geetanjali???? ? 6 years, 9 months ago

Change in any of the factors that determine the equilibrium conditions of a system will cause the system to change in such a manner so as to reduce or to counteract the effect of the change

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Why an air bubble in water rises from bottom to top in grows in size ?

Posted by 😜Arnav Arya🙃 6 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Asim Shabir 6 years, 9 months ago

Because the aquatic plants produce oxygen by the process of photosynthesis and that oxygen is absirbed by water and thats how fiahes get oxygen and the remaining oxygen is transfered to atmosphere and as much oxygen as bigger the bubble

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What is kinetic interpretation of temperature

Posted by Pushpendra Sharma 6 years, 9 months ago

CBSE > Class 11 > Physics