$A$ book is lying on a table. What is the angle between the normal reaction acting on the book on the table and the weight of the book (in $^\circ$)?

In the figure, the tension in the horizontal cord is $30\,N$. Find the weight of the body $B$.

Which of the following sets of concurrent forces may be in equilibrium?

$A$ ladder rests against a frictionless vertical wall,with its upper end $6 \, m$ above the ground and the lower end $4 \, m$ away from the wall. The weight of the ladder is $500 \, N$ and its center of gravity ($C$.$G$.) is at $1/3$ of its length from the lower end. The reaction force from the wall will be (in Newton):

Define force. What is contact force? Write two examples of field force.

For a particle to be in equilibrium,what must be the net force acting on it?