Figure 7-28 shows three
forces applied to a trunk that moves leftward by 3.00 m over a friction-less floor. the force magnitudes are f1=5.00 n. f2 = 9.00 n, and f3 = 3.00 n. and the indicated angle of f2 is 30 degrees. during the displacement, (a) what is the net work done on the
trunk by the three forces and (b)
does the kinetic energy of the trunk increase or decrease?
figure 7-28 problem 15.

cell differentiation  is how generic embryonic  cells  become specialized  cells. this occurs  through a process called gene expression. gene expression is the specific combination of genes that are turned on or off (expressed or repressed), and this is what dictates how a  cell  functions.

explanation:

see earlier answer

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this

the total distance that martina travels that day is

(distance from home to mom's office) plus (distance from mom's office to school)

plus (distance from school to library) plus (distance from library to friend's house)

plus (distance from friend's house to martina's house).

(we don't know what any of these distance actually is.)