Alex is asked to move two boxes of books in contact with each other resting on a rough floor. he decides to move both of them at the same time by pushing on box a with a horizontal pushing force of fp=8.9 n. here a has a mass of ma= 11.0 kg and b has a mass of mb= 7.0 kg. the contact force between the two boxes is fc. the coefficient of kinetic friction between the boxes and floor is .02. (assume fp acts in the +x direction)

a) what is the magnitude of the acceleration of the two boxes? m/s^2

b) what is the force exerted on mb by ma. in other words what is the magnitude of the contact force fc? n

c) if alex were to push from the other side on the 7.0 kg box, what would the new magnitude of fc be?

Aforce of 100 newtons is used to move an object a distance of 15 meters with a power of 50 watts. find the work dine and the time it takes to do the work

In the nineteenth century, gregor mendel first determined some basic rules of genetics that have been observed throughout all types of life. no observations have disproved these basic rules of genetics. charles darwin developed the idea of biological evolution around the same time, but he was unaware of mendel’s discoveries in genetics. over a century later, darwin’s idea of evolution was modified in order to incorporate mendel’s rules of genetics along with the other evidence that darwin had used. what is most likely the relationship between mendel’s rules of genetics and darwin’s idea of biological evolution? a.)mendel’s genetics states laws that are now part of the theory of biological evolution.b.)biological evolution states laws that are part of mendel’s theory of genetics.c.)mendel’s genetics replaced darwin’s entire concept of biological evolution.d.)biological evolution is a law that explains why all genetics exist.

Could we see a galaxy that is 20 billion light-years away?