Call me

Have a Query? We will call you right away.

+91

E.g: 9876543210, 01112345678

We will give you a call shortly, Thank You

Office hours: 9:00 am to 9:00 pm IST (7 days a week)

What are you looking for?

Syllabus

what is physical significance of moment of inertia?

8. Using Kirchhoff's rules in the given circuit,determine

(i) the voltage drop across the unknown resistor R and

(ii) the current I

_{2}in the arm EF.state and explain theorem of perpendicular and parellel axis what ia moment of inertia about circular disc

A force acts on a 3g particle in such a way that the position of the particle as a function of time is given by x=3t-4t

^{2}+t^{3}where x is in meters and t is in seconds. The work done during the first 4 sec.

Show that a Gravitational Force is a Conservative Force .

1)a ball is thrown vertically upwards . Draw velocity time graph of this motion?

2)define angle of friction?

3)the speed of a projectile reduces to 50% on reaching maximum height. what is the horizontal range?

4)distinguish b/w elastic & nonelastic collision .give 1 example for each

(a)Copper

(b)Aluminium

(c)Diode-valve

(d)None of these

The relation between the displacement x and the time t for a body of mass 2kg moving under the action of force is given by x=t

^{3}/3 , where x is in metre and t in second , calculate the work done by body in first 2 seconds.A particle is displaced through (3i-2j +2k) m under influence of force (-i+j-5k) N. calculate work done.

A running man has half the kinetic energy that a boy half his mass has. The man speeds up by 1.0m/s and then has the same energy as the boy. What were the orignal speed of the man and the boy?

a uniform chain of lenght L and mass M is lying on a smooth table and one third of its length is hanging vertically down over the edge of the table. if g is acceleration due to gravity,calculate work required to pull the hanging part on th table

Find the angle between the vectors A=i^-2j^-5k^ and B=2i^+j^-4k^

^{-1}. Then^{-1}^{-2}define escape velocity .derive expression for it

prove work energy theorem for a variable force

and my solution is below in the image. In my view my soln is incomplete, there is neither any derivation in my soln nor any diagram. Procedure is also incomplete. plz help me for completing this draw diag becaz diagram is necessary here

give 4 examples of positive, negative and zero work done with diagram

a force F=-K(yi+xj), where K is a positive constant,acts on a particle moving in a x-y plane.. starting from the origin yhe particle is taken alon positive x axisto a point (a,0) and then parallel to y axis to a point (a,a.) calculate the total work done by force on the particle.

a running man has half the k.e of that of a boy of half his mass.the man speeds up by 1m/s and then has the same k..e as that of boy. find original speeds of man and boy

Pls explain ncert example 6.13 pg 132 on how they find they find out the angles

Does the center of mass of a body always lie inside the body?

a) 3 m/s

b) 4 m/s

c) 6 m/s

d) 8 m/s

A shell is fired from a cannon with a velocity v m/s at an angle theta with the horizontal direction.At the highest point of this path , it explodes into two pieces of equal mass. One of the pieces retraces its path to the cannon.The speed in m/s of other piece immediately after the explosion will be ?

_{l}on the wall. A second peg P_{2}is fixed vertically below the first one at a distance 3R/7 from it. The pendulum is drawn aside such that the string is horizontal and released. Calculate the maximum height (with respect to the lowest point) to which it risesshow that total energy is conserved at any instant of time (mathematically) in the following cases:

freely falling body;

spring;

bouncing of a ball;

1)4.9J

2)9.8 J

3)3.5J

4)90J

A man pulls a bucket of water from a well of depth H. if the mass of uniform rope and bucket full of water are m and M respectively. The value of work done by man is

A.(M+m/2).g.h

B.(M+m)gh

C.(m+M)/2.G.H

D. none

A uniform rope of length L and mass M hangs over a horizontal table with two third part on the table.The coefficient of friction between the table and the rope is

u. Calculate the work done by the friction during the period the rope slips copletely off the table?A bob of mass m is suspended by a light string of length L.It is imparted a horizontal velocity v

_{0}at the lowest point A such that it completes a semi- circular trajectory in the vertical plane with the string becoming slack only on reaching the topmost point,C.Obtain an expression fori) v

_{0}ii)the speeds at point B and C

A long spring is stretched by 2 cm when P.E. is V. If the spring is stretched by 10 cm, what is the value of P.E.?

2. A ball of mass 5 kg experiences a force F = 2xsquare + x . workdone in displacing the ball by 2 m is ?

3. a body is acted upon by a force F = - i cap + 2 j cap + 3 k cap . what is the work done by the force in displacing it from (0,0,0) to (0,0,4 m) ?

A train weighing 100 metric ton is running on a level track with a uniform speed of 72 km/h.If the frictional resistance amounts 0.5 kg per metric ton,find the power of the engine.how is multiply of icap and jcap is 0 ?

Respected authorities pls explain ncert question 6.28 step wise especially the relative velocity part

An engine pumps water through a hose pipe. water passes through the pipe & leaves it with a velocity of 2 m/s. the mass per unit length of water in the pipe is 100 kg/m. what is the power of the engine?

a) mg

b) 2mg

c) 2mg/3

d) m

^{2}g/h_{A}& m_{B }respectively, then:-a) 2m

_{A}=m_{B}b) 3m

_{A}=m_{B}c) 4m

_{A}=m_{B}d) (3)

^{1/}^{2}m_{A}=m_{B}^{-1}) (ans : 5root2)HOW DOES THE KINETIC ENERGY OF A BODY CHANGE IF ITS MOMENTUM IS DOUBLED ?plz explain me integration and differentiation with basics and examples and formulas.....plzzzz badly needed.....help as soon as posssible.....reply awiated!!!!!!

1. An object is attached to a vertical spring and slowly lowered to its equilibrium position. This stretches the spring by a distance d.if the same object is attached to the same vertical spring but permitted to fall freely, through what distance does it stretches the spring.

2.A block of 2 kg is dropped from a height of 40 cm on a spring of force constant 1960 N/m what will be the maximum distance x to which the spring is compressed.

a body of mass M at rest is struck by a moving body of mass m. prove that the fraction of initial K.E of mass transferred to the struck body is 4Mm/(m+M)^2

A block of mass m is attached to two unstretched springs of spring constants k1 and k2 as shown in figure.The block is displaced towards right through x and is released. Find the speed of the block as it passed through the mean position.

A body is initially at rest. It undergoes one-dimensional motion with constant acceleration. The power delivered to it at time

tis proportional to(i) (ii)

t(iii) (iv)The blades of a windmill sweep out a circle of area

A. (a) If the wind flows at a velocityvperpendicular to the circle, what is the mass of the air passing through it in timet?(b) What is the kinetic energy of the air? (c) Assume that the windmill converts 25% of the wind’s energy into electrical energy, and thatA= 30 m^{2},v= 36 km/h and the density of air is 1.2 kg m^{–3}. What is the electrical power produced?Show that in head–on collision between two balls of equal masses moving along a

straight line, the balls simply exchange their velocities. (inelastic collision)

if kinetic energy of the body is increase by 300 percent then by what percent will its linear momentum increase

Q-14 Draw the graph between applied force and force of friction,representing the zone of static friction,limiting friction and kinetic friction.

Q -15. Find a unit vector perpendicular to both the vectors A=3i +j+ 2k and B=2i -2J+ 4k

Q -16. A block of mass 0.05 kg when placed on a rough 15

^{o}inclined plane slides down without acceleration .The inclination is then increased to 30^{o}.What would be the acceleration of block.g=9.8 m/sec^{2}.Q -17. A stone is thrown front the top of the tower at an angle of 30

^{o}up with the horizontal with a velocity of 16 m/s .After 4 sec of light it strikes the ground. Calculate the height of the tower from ground and the horizontal range of the stone (g=9.8m/sec^{2})Q-18. An automobile moving at a speed of 72 km/hr reaches the foot of a smooth inclined plane when the engine is switched off.How much distance does the automobile go up the incline before stopping ?The incline makes an angle of 30

^{o}with horizontal (g=9.8 m/sec^{2}).Q-19. prove that in an elastic collision in one dimension,the relative velocity of approach before impact is equal to the relative velocity of separation after collision.

Q-20. Determine the acceleration a of the system and the tensions T

_{1}and T_{2}in the strings.Assume that the table the pulleys are frictionless and the strings are massless.(g=9.8m/sec^{2}).Q -21 A light body and a heavy body have linear momentum, which one has greater K.E.

Q -22. Show that in head on collision between two balls of equal masses moving along a straight line , the bells are simply exchange their velocity.

Q-23. Two parallel rail lines are in the direction North and South .A train 'A' runs in north direction with a speed of 54 km/hr and another train 'B' runs in the south direction with speed of 90 km/hr .Find

(i) The velocity of 'B' relative to 'A'

(ii) Velocity of ground relative to 'B'

(iii) Velocity of a monkey running on the roof of 'A' against its motion with a velocity of 18 km/hr relative to 'A' as observed by a man standing on the ground .

[Ans -144 km/hr,+90 km/hr ;36 km/hr]

Q -24 A particular performing uniform circular motion has angular momentum L.What will be the new angular momentum ,if the angular frequency is doubled and K.E. is halved ?

Q -25. drive relation between torque and angular momentum.Also state law of conservation of angular momentum.Write the example based on it.

Q -26. Three identical spheres ,each of radius R,are placed touching each other on horizontal table.

two vectors of equal magnitude have a resultant equal to either of them, then the angle between them will be equal to...?

Solve this:The value of acceleration and friction force in the given diagram is:

(1) 4 m/s

^{2}upward, 120 N(2) 4 m/s

^{2}downward, 120 N(3) 5 m/s

^{2}upward, 36 N(4) 5 m/s

^{2}upward, 120 NA ball falls from a height such that it strikes the floor of lift at 10 m/s.If lift is moving in the upward direction with a velocity 1 m/s, then velocity with which the ball rebounds after elastic collision will be?

An elevator can carry a maximum load of 1800kg, is moving up with a constant speed of 2m/s. The frictional force opposing the motion is 4000N. Determine the minimum power delivered by the motor to the elevator in watts. (take g=9.8m/s

^{2}A chain of mass M is placed on a smooth table with 1/n of its length L hanging over the edge. The work done in pulling the hanging the portion of the chain back to the surface of the table is

a) MgL/n b)MgL/2n

C)MgL/n

^{2 }d)MgL/2n^{2}in a factory an engine of 5.3 hp is to be used to lift 4000kg of coal through distance of 12m calculate time taken by engine to do this

A ball is dropped vertically from rest at a height of 12m. After striiking the ground , it bounces back to a height of 9m. What fraction of kinetic energy does it lose on striking the ground?

Q. A particle of mass 0.1 kg is subjected to a force which varies with distance as shown in fig.

If it starts its journey from rest x=0, its velocity at x=12 is

(1) 0 m/s

(2) $\sqrt[20]{3}\text{m/s}$

(3)$\sqrt[20]{2}\text{m/s}$

(4) 40 m/s

_{o}and it is compressed to half its natural lenghtwhen the block is released. Find the velocity of the block as a function of its distance x from the wall?(A) PROVE THAT IN CASE OF OBLIQUE ELASTIC COLLISION OF TWO PARTICLES OF SAME MASS IF ONE IS AT REST, AFTER COLLISION BOTH PARTICLES MOVES AT RIGHT ANGLE TO EACH OTHER.

The potential energy of 1kg particle free to move along the x-axis is U(x)=x^4/4-x^2/2 J (x in meters). if the total mechanical energy of the particles is 2J find the maximum speed of the particle.

^{2})Q3. two straight lines are drawn on the same displacement time graph make angles 30 degree & 60 degree with time axis respectively which line represents greater velocity ? what is the ratio of the two velocities ?

.

Q. WHAT DO YOU MEAN BY POSITIVE, NEGATIVE AND ZERO WORK DONE. GIVE AT LEAST ONE EXAMPLE OF EACH CASE.

Is there any formula for inelastic collision??????????????An air bubble formed by explosion under water performs oscillations with time T which depends upon the static pressure P, water density 'd', and energy of explosion E. Establish the formula for the period 'T' by dimensional analysis.

A pendulum bob of mass 0.1 kg is suspended by a string of 1m long.The bob is displaced so that the string becomes horizontal and released. Find its kinetic energy when the string makes an angle of (i) 0

^{o}, (ii) 30^{o}with the vertical.