The settled life time of a molecule with a radius of 25 nm is 21.8 nsec. Calculate the root mean square movement of this molecule in 3 seconds. The shape of the molecule is spherical

that would be b i just took the test : )

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