Force Couple

Q.

A uniform slender bar AB of mass m is suspended as shown from a small cart of the same mass m. Neglecting the effect of friction, determine the accelerations of points A and B immediately after a horizontal force F has been applied at B

1. 

2. 

3. 

4. 

Q. A body executes SHM under action of force F1 with time period 4/5 second. If the force is changed to F2 , it has time period 3/5 second , if both F1 and F2 act simultaneously in the same direction on the body , its time period will be A. 12/25 s B. 24/25 s C. 35/24 s D. 15/24 s

Q. In new system , the force between the masses given by F directly proportional to r^2 , then time period of revolution T is proportional to

Q. A couple is acting on a rigid body,
Statement 1:- Linear acceleration of center of mass of body will be zero
Statement 2:- Magnitude of torque due to couple will be same about any point lying on or outside the body.

1. Statement 1 is correct and statement 2 is incorrect.
2. Statement 1 is incorrect and statement 2 is correct.
3. Both statements are correct.
4. Both statements are incorrect.

Q. what is the difference between absolute and relative motion?

Q. $20\text{Nm}$ torque is applied to a flywheel that rotates about a fixed axis and has moment of inertia of $25{\text{kgm}}^2$. If the flywheel is initially at rest, what is its angular velocity after it has turned through $10$ revolutions?

1. $5\text{rad/s}$
2. $20\text{rad/s}$
3. $10\text{rad/s}$
4. $15\text{rad/s}$

Q. A couple consisting of two forces $F_1$ and $F_2$ each equal to $5\text{N}$ is acting at the rim of a disc of mass $2\text{kg}$ and radius $0.5\text{m}$ for $5\text{s}$. Initially, the disc is at rest, the final angular momentum of the disc is

1. $15\text{Nm-s}$
2. $20\text{Nm-s}$
3. $25\text{Nm-s}$
4. $30\text{Nm-s}$

Q. Why is motion always relative in nature

Q. 5.What is projectile motion.

Q.

Statement 1: In order to make a body rotate, the net external force applied can be zero.

Statement 2: A body can even rotate in absence of any external force.

1. Both statements are correct

2. Statement 1 is correct but statement 2 is incorrect

3. Statement 1 is incorrect but statement 2 is correct

4. Both statements are incorrect

Q. 9. If u=11 and v=56 and timeis equal to 78sec find the force applied by a moving object on an object.

Q. A force F = (4i - 5j +3k )N is acting at a point having a position vector r1=(i+2j+3k) .The torgue acting about a point having a position vector r2 = (3i-2j-3k)is