When the kettle is switched on, the temperature of the waternear the heating element increases. As the temperature of the water increases, the
water_ and becomes less_. the heated water_ towards the top of the kettle. the movement of the water sets up the convection__
and becomes less
The heated water
towards the top of the kettle.
The movement of the water sets up a convection_

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weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards