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(a)Copper

(b)Aluminium

(c)Diode-valve

(d)None of these

what is physical significance of moment of inertia?

state and explain theorem of perpendicular and parellel axis what ia moment of inertia about circular disc

Two balls with the same mass, one of wood and the other a ping-pong ball partly filled with sand, are

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.

A motor having an efficiency Of 90 % operates a crane having an efficiency of 40%. With what constant speed does the crane lift a 500kg weight if the power supplied to the motor is 5 KW ?

Show that a Gravitational Force is a Conservative 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

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)negative b)positive c)zero d)unpredictable.

please explain why

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.2s along a frictionless track. The

graph shows the force on the body

against time.How much work is done by the force?

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

height ‘h’ near the surface of the earth in a

time ‘t’.

a) Draw the force-displacement graph.

b) If ‘A’ is the area of the graph, what

quantity does

A/t indicate?

pls answer fast

^{-1}. Then^{-1}^{-2}A. <v> B. <V^4> C. <V^3> D. <V^5>

define escape velocity .derive expression for it

What is the gravitational potential energy of a 61.2 kg person standing on the roof of a 10-storey

prove work energy theorem for a variable force

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

A force of 5.0 N moves a 6.0 kg object along a rough floor at a constant speed of

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.

_{gravity}) is assume to be 0. Potential energy U will change with displacement x of the block asa 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

a. opposite charge is induced to outer surface of B

b.same kind of charges are induced in the inner surface

c. the whole charge of A gets transferred to outer surface of B

d.the whole charge of A gets trransferred to inner surface of B?

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

Find the angle between force F = (3i +4j -5k) unit and displacement d = (5i +4j -3k) unit. Also find the projection of F on d.

a) 3 m/s

b) 4 m/s

c) 6 m/s

d) 8 m/s

how is multiply of icap and jcap is 0 ?

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 ?

2. If K.E of a body increases by 0.1 % , the percent increase in its momentum will be ?

3. A postion dependent force F = ( 7 - 2x + 3x square )N acts on a small body of mass 2kgand displaces it from x = 0 to x = 5m. Work done in joule is ?

show that total energy is conserved at any instant of time (mathematically) in the following cases:

freely falling body;

spring;

bouncing of a ball;

Q. Starting from rest on her swing at initial height ${h}_{0}$ above the ground, Saina swings forward. At the lowest point of her motion, she grabs her bag that lies on the ground. Saina continues swinging forward to reach maximum height ${h}_{1}$. She then swings backward and when reaching the lowest point of motion again, she simple lets go off the bag, which falls freely. Saina's backward swing then reaches maximum height ${h}_{2}$. Neglecting air resistance, how are the three heights related ?

(1) ${h}_{0}>{h}_{1}>{h}_{2}$

(2) ${h}_{0}={h}_{1}={h}_{2}$

(3) ${h}_{0}>{h}_{1}={h}_{2}$

(4) ${h}_{0}={h}_{2}>{h}_{1}$

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 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

plz explain me integration and differentiation with basics and examples and formulas.....plzzzz badly needed.....help as soon as posssible.....reply awiated!!!!!!

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.?

A 12 V car battery is found to be capable of storing 2.0 kW.h of electrical energy. For a certain

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.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?

^{o}from the vertical, the change in potential energy is U, the change in potential energy when it is displaced further trough 60^{o}is? (ans : 2U)_{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}what is the % change in kienetic energy ifa) speed is increased by 10%b) momentum is increased by 20%HOW DOES THE KINETIC ENERGY OF A BODY CHANGE IF ITS MOMENTUM IS DOUBLED ?how did "W= -kxdx" become "W=-kx

^{2}/2"where did that "/2" come from ??????

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 cyclist climbing up an inclined road maintains a constant speed of 18km/h. The total mass of cycle plus the cyclist is 120 kg. If the angle of inclination is 15 degrees, what is the minimum power expended by the cyclist. g=9.8m/s

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

(i)Both bodies exchange their velocities after collision.

(ii)Light body rebounds after the collision with an equal and opposite velocity.

(iii)Light body rebounds with twice its initial velocity.

(iv)Massive body moves with the velocity of light body.

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.

1. a= 16 b 2. b = 16 a 3. a=b 4. None of these

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)Is there any formula for inelastic collision??????????????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?a machine gun fires 90 bullets per minute with a velocity of 800 m/s . if each bullet has a mass of 15 g , find the power developed by the gun .

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

2 cars of same mass are moving with velocities v1 and v2 respectively. If they are a stopped by supplying same breaking power in time t1 and t2 respectively then v1/v2 is

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

when the tings is released, determine the tangential acceleration of the ring.

A 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}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?

a block having mass 500g slides on a rough horizontal table if the friction btw. the block and table is 0.2 and intial speed of the block is 60cm/s calculate

a } work done by the frictional force in bringing the block to rest

b} how far does the block move before coming to rest?

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

(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.

state the law of conservation of energy and verify it in case of a freely falling body . what are the conditions under which the law of conservation of energy is applicable ?MUlti choice correct

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 ?

.

PROVE THAT THE SCALAR PRODUCT OBEYS THE DISTRIBUTIVE LAW

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

A monkey is descending from the branch of a tree with constant acceleration. If the breaking strength is 75% of the weight of the monkey, what is the minimum acceleration

with which monkey can slide down without breaking the branch.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.