What is the weight of a column of air with cross-sectional area 4.5 m^2 extending from Earth's surface to the top of the atmosphere?

the small 0.38-kg slider is known to move from position a to position b along the vertical-plane slot. determine (a) the work done on the body by its weight and (b) the work done on the body by the spring. the distance r = 0.70 m, the spring modulus k = 154 n/m, and the unstretched length of the spring is 0.53 m

explanation:

-reverse card

according to jean piaget, in what stage of cognitive development are children able to understand conservation task?

b. preoperational

just took it