A boy walks from point C to point D which is 50 m apart. Then, he walks back to point C. what is his displacement of his whole journey ? A.25 m
B.75 m
C.50 m
D.0 m

In a system, when potential energy decreases, then entropy also decreases. true false

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?

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.