Name: Period:
Date:
RELATIVE MOTION
1. A motorcycle is driving due North at 50 mph relative to the ground. A blue truck is driving the same
direction as the motorcycle at 56 mph with respect to the ground. A red sports car is driving due south
at 75 mph relative to the ground. A bird is flying due south above the red car. The bird's speed is 140
mph with respect to the motorcycle.

Acompound machine is also called a machine. a. force b. simple c. complex d. directional

Total solidification times of three casting geometries are to be compared: a sphere, a cylinder, in which the length-to-diameter ration - 1.0, and a cube. volume = 1000 cm^3 for all three shhapes, and the same casting alloy is used. a) determine the solidification times of each geometry b) based on the results of part (a), which geometric element would make the best riser? c) if the mold constant = 3.5 min/cm^2 in chvorinov's rule, compute the total solidification time for each casting.

An object's buoyant force and weight mean the same thing.a. trueb. false