Aspring with spring constant of 21 n/m is stretched 0.16 m from its equilibrium position. how much work must be done to stretch it an additional 0.15 m

Explanation:

We use the equation to calculate the work from a point to a point on a spring:

where is the work, and is the spring constant, .

For this problem since the spring was first stretched 0.16m, , and then was stretched an aditional 0.15m, so .

Now we substitute the known values in the equation to find the work:

The work that must be done to stretch the spring an aditional 0.15m is 0.74 Joules

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue

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

b. preoperational

just took it