Two particles move at right angle to each other de Broglie wavelengths as and , particle suffers a perfectly inelastic collision. The de Broglie wavelength of final particle is given by

- Option 1)
- Option 2)
- Option 3)
- Option 4)

option 3

Two particles , of masses M and 2M , moving as shown , with speeds of 10 m/s and 5 m/s ,

collide elastically at the origin.After the collision , they move along the indicated directions with

speeds and , respectively. The values of and are nearly :

- Option 1)
6.5 m/s and 6.3 m/s

- Option 2)
3.2 m/s and 6.3 m/s

- Option 3)
6.5 m/s and 3.2 m/s

- Option 4)
3.2 m/s and 12.6 m/s

A body of mass moving with an unknowm velocity of , undergoes a collinear collision with a body of mass moving with a velocity . After collision , and move with velocities of and , respectively.

If and , the is :

- Option 1)
- Option 2)
- Option 3)
- Option 4)

A particle of mass is moving with speed and collides with a mass moving with speed in the same direction. After collision , the first mass is stoped completely while the second one splits into two particles each of mass , which move at angle with respect to the original direction.

The speed of each of the moving particle will be :

- Option 1)
- Option 2)
- Option 3)
- Option 4)

Two particles move at right angle to each other. Their de Broglie wavelengths are and respectively. The particles suffer perfectly inelastic collision. The de Broglie wavelength , of the final particle, is given by :

- Option 1)
- Option 2)
- Option 3)
- Option 4)

A body of mass makes an elastic collision with a second body at rest and continues to move in the original direction but with one fourth of its original speed.What is the mass of the second body ?

- Option 1)
- Option 2)
- Option 3)
- Option 4)

mass of body =
initial velocity of body
mass of body
A B
rest
(from e=1)
momentum balance
Option 1)
Option 2)
Option 3)
Option 4)

A particle moves in one dimension from rest under the influence of a force that varies with the distance travelled by the particle as shown in the figure. The kinetic energy of the particle after it has travelled 3 m is :

- Option 1)

- Option 2)
- Option 3)
- Option 4)

Work Energy theorem
Now work is Area of F vs distance curve.
Option 1)
Option 2)Option 3)
Option 4)

A uniform cable of mass and length is placed on a horizontal surface that its part is hanging below the edge of the surface. To lift the hanging part of the cable upto the srface, the work done should be :

- Option 1)
- Option 2)
- Option 3)
- Option 4)

Total length of rod=
Length hanging=
initial P.E =
final P.E=
Option 1)
Option 2)
Option 3)
Option 4)

Work done by frictional is zero when the object to which it is acing does not move any distance.

incomplete question

Arrangement of two block system is as shown in the figure . mass of block A is

and mass of B is

A constant force F = 100 N applied on upper block A . Friction between A and B is . and b/w B and ground surface is smooth , then find work done by frictional force on block B in t = 2 sec if system starts from rest

friction force on block A,
An equal and opposite force will be applied on block B
Work done =

A lift of mass m is moving upwards direction with acceleration g/4 , its displacement is n. find work done by tension force.

A mass m slides from rest at height h down a curved surface which become horizontal at zero height (see figure). A sping is fixed horizontally on the level part of the surface. The spring constant is K N/m. When the mass encounters the spring it encounters, it compresses the spring x=h/10. If m=1Kg,h=5m find k/100

When the mass encounters the spring it encounters, it compresses the spring x=h/10. If m=1Kg,h=5m then value of k/100 is:

For two particles A and B, given that r(A)=2i+3j, r(B)=6i+7j, v(A)=3i-j and v(B)=xi-5j. what is the value of x if they collide.

If two particle A & B collide then the value of x is:

A uniform chain of length 2 m is kept
on a table such that a length of 60
cm hangs freely from the edge of the
table. The total mass of the chain is 4
kg . What is the work done in pulling
the entire chain on the table ?

Consider a small part dx at a depth x from table.
Work done in lifting this small portion is dw = dm gx
Total work done

Sir 6th ano 7th question please Track OABCD (as shown in figure) is smooth and fixed in vertical plane. What minimum speed has to be given to a particle lying at point A so that it can reach point C

The speed to reach B is obtained by

u=80m/s. A slight push is enough for ball to reach C

so minimum speed is 80m/s

mechanical_energy.PNG
A person trying to lose weight by burning fat lifts a mass of 10 kg upto a height of 1 m 1000 times. Assume that the potential energy lost each time he lowers the mass is dissipated How
much fat will he use up considering the work done only when the weight is lifted up?

Total work done by the person in lifting the weigh = mgh
Total mechanical energy produced by burning 1 kg fat
Total fat burn

A force acts on a 2kg object so that its position is given as a function of time as x = 3t2 + 5. What is the work done by this force in first 5 seconds?

A block of mass m = 5 Kg is moving up on inclined plane of angle theta = 30 degree with horizontal with constant velocity V by the help of force F . What is the work done by force F to move the object up the inclined by distance 's' [ given mu_k = 1/ root3] b/w surface and block and rho = 2 m g = 10 m/s ^2

A block of mass 2 kg slides on a horizontal floor with velocity 4 m/s. It hits an uncompressed spring and compresses it till its final velocity reduces to zero the kinetic frictional force is 15 N and spring constant is 10000 N/m. Find the spring compression

Change in Kinetic energy = Work done by all forces.
Here
Wf = Work done by spring
Wf = Work done by friction
On solving it x = 5.5 cm

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