What is a disadvantage of using nonrenewable energy resources?

a. they cannot be replenished in human lifetime

b. they are readily available

c. they cause problems with bird populations

d. they do not produce greenhouse gases

answer; ///i believe that the correct answer is (45*) at a 45 degree check first good

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