Consider a copper-based material containing precipitates with an average spacing of 500 nm. The contribution of these precipitates to the yield strength of the alloy is 200 MPa. If the precipitate spacing were decreased to 200 nm, what would be the new contribution of the precipitates to the yield strength of the alloy?

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