A baseball was hit at 45 m/s at an angle of 45° above the horizontal.
a) How long did it remain in the air (before it reaches the same height it was hit)?
b) How far did it travel horizontally?

NEED EXPLANATION
ANSWERS:
a. 6.6seconds
b. 2.1 * 102m

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.