In H.C.Verma Concepts of physics vol-1 Pae no.77 plzz.... explain the questions.6 & 7 in OBJECTIVE-1 !!!!I will b happy to approve !!!

Q6=>

when a mass m₁ is placed on another mass m₂ & system is acclerated with accleration a then

mass m1 experiences a seudo force(imaginar force) whose magnitude is block given by m1a (mass of bodyxaccleration of system) ..

here in this case a block is placed on an incline & seudo force acts on block is in opposite direction to the accleration ...

now resolving this seudo force into two components Fcos@ along along the incile  & F sin@ along the normal of plane ...

(F is seudo force )

it is given that the block is not slipping so net force along incline is 0 ...

Fcos@ = mgsin@ ...........1

now normal force exerted = (normal comp of weight along ) + (normal comp of seudo force)

                 N                =            mgcos@  +   Fsin@

from eq 1

               N = mgcos@ + mgsin@tan@

               N = mg(sin²@+cos²@)/cos@

sin²x + cos²x = 1 so

           N = mg/cos@

Approved