Frequently, attention in an equilibrium situation is confined to a plane. an example would be a ladder leaning against a wall, which is in danger of slipping only in the plane perpendicular to the ground and wall. by orienting a cartesian coordinate system so that the x and y axes are in this plane, choose which of the following sets of quantities must be zero to maintain static equilibrium in this plane. a.\sum f_x and \sum \tau_z and \sum f_yb.\sum f_z and \sum \tau_x and \sum \tau_yc.\sum \tau_x and \sum f_x and \sum \tau_y and \sum f_yd.\sum \tau_x and \sum f_x and \sum \tau_y and \sum f_y and \sum \tau_z

the largest known star in the universe is uy scuti, a hypergiant with a radius around 1,700 times larger than the

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

the best answer for these questions would be:

1.            c. is smaller

2.            d) concrete operational

3.            b) interaction with the environment – the children interact with their environment can them learn more.

4.            a) parents who reason openly with children can limit a child’s cognitive ability.