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

Prove that newton's second law of motion is the real law

State and prove law of conservation of linear momentum

1) net force= Pcostheta , if P cos theta< mg

2)N= mg -Psin theta , if Psintheta< mg

3) a=Pcostheta/m , when P> mgcostheta

Friction is a necessary evil.Explain

15. In the arrangement shown in figure m

_{A}=m and m_{B}=2m, while all the pulleys and string are massless & frictionless. At t=0, a force F=10 t starts acting over central pulley in vertically upward direction. Find.(a) Time at which both the masses lose contact with floor.

(b) Velocity of A when B loses contact with floor.

[Take all the units into .S.I. System, take m=1 kg and g= 10 m/s

^{2}for part (b)]the velocity 'u' of a body moving along a straight line with constant retardation 'a' reduces by 75% in time 't'. what is the time taken in doing so???

plz show the prcess

State and prove the conservation of angular momentum.

A particle of mass

mmoves with constant speedvon a circular path of radiusr. Find the magnitude of average force on it in half revolution._{1}and T_{2}in the string shown in figureTwo balls A and B are thrown simultaneously ,A vertically upwards with a speed of 20m/s from ground,and B vetically downwards from a height of 40 m with the same seed and along the same line of motion . At what points do the two balls collide ?

shown in the figure. Find the time taken by the chain to slip

off the table.

A cricket ball of mass 150g is moving with a velocity of 12m/s and is hit by a bat, so that the ball is turned back with a velocity of 20m/s. The force of the blow acts for 0.01s on the ball. Find the average force exerted by the bat on the ball.

what are the limitations of dimensional analysis?

1. Two blocks of masses 20 kg and 50 kg are lying on the horizontal floor (coefficient of friction $\mu $ =0.5). initially staring is stretched and blocks are at rest. Now two forces 300 N and 150 N is applied on two blocks as shown in figure. The acceleration of 20kg block is 2.5 K m/s

^{2}. Find the value of K.

A machine gun has a mass of 20kg. It fires 30g bullets at the rate of 400 bullets per second with a speed of 400 m/s. What force must be applied to the gun to keep it in position ?

The apparent weight of a person inside a lift is 'W1'.when lift moves up with certain acceleration and is w2.when lift moves down with same acceleration.The weight of person when lift moves up with constant speed is

28. If pulleys shown in the diagram are smooth and massless and a

_{ 1}and a2 are acceleration of blocks of mass 4 kg and 8 kg respectively, then(a) a

_{1}= a_{2}(b) a

_{1}= 2a_{2}(c) 2a

_{1}= a_{2}(d) a

_{1}= 4a_{2}Q72. In the arrangement as show below m

_{1}= 1 kg ,m_{2}= 2kg. Pulleys are massless and strings are fight. For what value of M the mass m_{1}moves with constant velocity ? (Neglect Friction)(1) 4 kg (2) 8 kg

(3) 6 kg (4) 10 kg

show that for two complementary angles of projection of a projectile thrown with thw same velocity. the horizontal ranges are equal

prove Lami's theorem.

a block A of mass4 kg is placed on another block B of mass 5kg B rests on smooth table for sliding block A onB a horizontal force of 12 N is required to be applied on A how much max force can be applied on Bso that both A andB move together

Question: On an object of mass 1 kg moving along x-axis with constant speed 8m/s, a constant force 2 N is applied in positive y- direction. Find its speed after 4 seconds.

Please explain how to solve the above question. The answer is 8√2m/s.

a block of mass m is placed on a smooth wedge of inclination theta.the whole system is acclerated horizontally so that the block has a magnitude equal to???

A Spring Of Force Constant k is cut into two pieces , such that one piece is doubled the lengthof other . Then the long piece will have a constant of...................?

A system consists of two cubes of masses m

_{1}and m_{2}respectively connected by a spring of force constant k. The force (F) that should be applied to the upper cube to keep it at rest for which the lower one just lifts after the force is removed is?A) m

_{1}g (C) (m_{1}+ m_{2})g(B) $\frac{{m}_{1}{m}_{2}}{{m}_{1}+{m}_{2}}g$ (D)m

_{2}gwhy cricket player lowers his hands while catching a cricket ball?

Here t is in seconds. Find the time when block Q again comes to rest?

derive an expression for banking of road with the help of diagram?

why wheels are made circular in automobiles?

Find the value of T1 and T2 for the system shown in figure.

1) 10root3 m /s

2) 20root m/s

3) 40/root3 m/s

4) 40 m/s

2. A 20 kg block B is suspended from a cord attached to a 40 kg cart A. Find the ratio of the acceleration

of the block in cases (i) & (ii) shown in figure immediately after the system is released from rest. (neglect friction)

3. The system shown adjacent is in equilibrium. Find the acceleration of the

blocks A, B & C all ofequal masses m at the instant when

(Assume springs to be ideal)

(a) The spring between ceiling & A is cut.

(b) The string (inextensible) betweenA & B is cut.

(c) The spring between B & C is cut.

Also find the tension in the string when the system is at rest and in the above 3 cases,

s

4. In the system shown. Find the initial acceleration ofthe wedge of mass 5M.

The pulleys are ideal and the cords arc inextensible.

(there is no friction anywhere).

Why is pulling a lawn roller easier than pushing it?

a stone is dropped from a height h . it hits the ground with a certain momentum P . if the same stone is dropped from a height 100% more than the previous height , the momentum when it hits the ground will change by ??

How is a friction is a necessary evil?

(A) If ${\mu}_{1}{\mu}_{2}$ , the blocks will always remain in contact.

(B) If ${\mu}_{1}{\mu}_{2}$ , the blocks will slide down with different accelerations (if blocks slide)

(C) If ${\mu}_{1}{\mu}_{2}$ , the blocks will have a common acceleration 1/2 $({\mu}_{1}+{\mu}_{2})g\mathrm{sin}\theta $

(D) If ${\mu}_{1}{\mu}_{2}$ , the blocks will have a common acceleration $\frac{{\mu}_{1}{\mu}_{2}g}{{\mu}_{1}+{\mu}_{2}}\mathrm{sin}\theta $

trajectory it splits into three segments of masses m, m and 2m. First part falls vertically

downward with zero initial velocity and second part returns via same path to the point of

projection. The velocity of third part of mass 2m just after explosion will be

a) U cos theta b) 3/2 u cos theta c) 2u cos theta d) 5/2 u cos theta

Please explain d ans in detail:

1) root uk

2) 1/ root us

3 us

4) 1/uk

_{1},m_{2}and m_{3}of three bodies shown in figure 5, 2 and 3 kg respectively .Calculate the value of tension T_{1},T_{2}and T_{3}when(i) the whole system is going upward with an acceleration of 2m/s?

(ii) The whole system is stationary

(g= 9.8 m/s?)

Q=A ball of mass 20 g hits a wall at an angle of 45^{o}with a velocity of 15 m/s.If the ball rebound at 90^{o}to the direction of incidence ,calculate the impulse received by the ball.define angle and coefficient of friction and find the relationship b/n them.

(a)M=2m

(b)M less than 2m

(c)M greater than 2m

(d)M=m

(a) $\overrightarrow{R}+\overrightarrow{T}+\overrightarrow{W}=0$

(b) ${T}^{2}={R}^{2}+{W}^{2}$

(c) T=R+W

(d) R= W tan$\theta $

A man falls on a cemented floor and a man falls on a heap of sand who will get more hurt & why?

ABCDEF is a regular hexagon,,, Prove that AB + AC + AD + AE + AF = 6AO.

(direction sign {--} is present on the top of AB , AC,AD,AE,AF and 6AO)

Solve this.

36. The arrangement is kept in a vertical plane and all masses are released from rest with strings taut.

In column 1, different values of masses are given. Match with corresponding parameters in column 2.

Symbols have their ususal meanings. pulleys and strings are ideal.

Column 1 column 2

m

_{1 }m_{2}m_{3}m4 (P) |a_{1}| = |a_{3}|(A) 2m m 3m 4m (Q) T

_{1}= T_{2}(B) m 2m 4m 3m (R) T

_{2}> T_{1}(C) m 2m 3m 4m (S) |a

_{1}| > |a_{3}|(D) 4m 3m 2m m (T) T

_{3}= O1. A block of mass 10kg is sliding on a surface inclined at a angle of 30

^{0}with the horizontal. Calculate the acceleration of the block. The coefficient of kinetic friction between the block and the surface is 0.5?(i) A horizontal force of 5.0 N is applied on the 20 kg block as shown. State by what force this block presses

the 10 kg block.

(ii) If the above force is applied on the other side of the 10 kg block then by what force the 20 kg block will press the 10 kg block ?

Ans, (i) (10/6) N towards right,

how to solve this question with figure 3 blocks r connected together like on a horizontal frictionless table pulled to right with a force=50n if m1=5kg, m2=10kg, m3=15kg. find tension t1 and t2.

2. two masses of 7kg and 12kg r connectd at two end of light inextinsible string that goes over frictionless pulley. find acceleration of mass and tension on the string

prove that impulse is equal to the change in momentum

why friction is called a necessary evil?

(A) a

_{2}= 6a_{1}(B) a_{1}= 6a_{2}(C) a_{1}= 3a_{2}_{ }(D) a_{2}= 3a_{1}In the figure shown, what will be the acceleration of the block B if that of the A is 0.3 m/s

^{2}(A) 0.15 m/s

^{2}(B) 0.6 m/s^{2}(C) 0.3 m/s^{2}(D) none of thesethe motion of a particle of mass m is described by y = ut + 1/2 gt

^{2}. find the force acting on the particle^{2})(1) a

_{1}= 5 m/s^{2}; a_{2}= 2.5 m/s^{2}^{ }(2) a_{1}= a_{2}= 0(3) ${\mathrm{a}}_{1}={\mathrm{a}}_{2}=\frac{20}{6}\mathrm{m}/{\mathrm{s}}^{2}$ (4) ${\mathrm{a}}_{1}=20\mathrm{m}/{\mathrm{s}}^{2};{\mathrm{a}}_{2}=5\mathrm{m}/{\mathrm{s}}^{2}$

^{2}towards right. The acceleration of 20 kg mass at this instant is:-a) 12 m/s

^{2}b) 4 m/s

^{2}c) 10 m/s

^{2}d) Zero

1. prove that angle of repose is equal to angle of friction

2. prove that 2nd law of motion is the real law of motion. (what is real law of motion)

state the triangle law of vector addition and the parallelogram law of addition of vectors.

Two blocks of masses 2 kg. and 1 kg. are in contact with each other on a frictionless table . When a horizontal force of 3 N is applied to the block of mass 2 kg. the value of the force of contact between the two block is :(1) 4 N (2) 3N (3) 5 N (4) 1 N

a circular race track of radius 300 m is banked at an angle of 15

^{0}. if the coefficient of friction between the wheels of a race car and the road is 0.2 , what is the (i) optimum speed of the race car to avoid wear and tear on its tyres (ii) maximum permissible speed to avoid slipping ?plz experts help me out..............

a block of mass 2 kg rests on a rough inclined plane making an angle 30degrees with the horizontal . the coeffecient of static friction between the block and the plane is 0.7 . the frictional force on the block is??

28. In the setup shown, find acceleration of the block C.

a body constrained to move along the z axis of a coordinate system is subjected to a constant force F = ( -i +2j +3k) N . what is the work done by the force in moving the body over a distance of 4 m along the z axis.

80 railway wagons all of same mass 5*10

^{3}are pulled by a force 4*10^{5}N . the tension in coupling between the 30 and the 31 wagon from the engine is( ans= 25*10

^{4}N)^{2}) :-a) 760 N

b) 1360 N

c) 1580 N

d) 1620 N

Kindly answer sir/mam.