4. The skydiver has a weight of 900Newtons and feels
SONewtons of friction. (SEE PICTURE ON LEFT)
Draw a diagram. What is the Net Force?
What direction is this Net Force?
What must be true of the motion of the skydiver?

Give an example of a collision in real life. use the law of conservation of energy to describe the transfer of momentum. be sure and discuss the momentum before and after the collision occurs. you will need at least 3 sentences to thoroughly answer this question.

The space between two 15-in.-long concentric cylinders is filled with glycerin (viscosity = 8.5 × 10-3 lb·s/ft2). the inner cylinder has a radius of 1 in. and the gap width between cylinders is 0.1 in. determine (a) the torque and (b) the power required to rotate the inner cylinder at 180 rev/min. the outer cylinder is fixed. assume the velocity distribution in the gap to be linear.

Which of the following are forms of phase changes a. freezing b. condensation c. heating d. exchanging