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.

Samir watches a 100-minute movie on his spaceship. maria's spaceshipe flies in the same direction as samir's spaceship but she observes his move to last 125 minutes and his spaceship to be 40 m long. how long does samir observe his own spaceship to be? according to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does marias voyage take according to samir?

Which branches of natural science include the study of an organism that lived 10 million years ago

It is reasonable to assume that the bulk modulus of blood is about the same as that of water (2.2 gpa). as one goes deeper and deeper in the ocean, the pressure increases by 10000 pa for every meter below the surface. if a diver goes down 80.0 m in the ocean, by how much does each cubic centimeter of her blood change in volume? give the answer in cubic centimeters (actually one cubic centimeter equals one milliliter).