1. Oregon State University PH 211, Class #6
Two identical balls are thrown simultaneously at a speed of 20 m/s from the same height on a bridge over a lake. Ball A has an initial trajectory angle of 30° above the horizontal; Ball B has an initial trajectory angle of 30° below the horizontal. Both hit the water. Assuming no air drag (and constant g), what will you see?
A. Both hit the water at the same time.
B. Both hit the water with the same impact speed.
C. Both reach the same maximum height.
D. Both move the same horizontal distance before impact.
E. More than one of the above.
10/6/17
Oregon State University PH 211, Class #6

2. Oregon State University PH 211, Class #6
A battleship simultaneously fires two shells at enemy ships. The shells follow the paths shown here. Assuming negligible air drag, which ship gets hit first?
Ship A
Ship B
They are hit at the same time.
There is not enough information.
10/6/17
Oregon State University PH 211, Class #6

3. Oregon State University PH 211, Class #6
You’re on the surface of planet Irth, where they haven’t yet invented calculators (or air), but fortunately the free-fall acceleration due to gravity is 10.0 m/s2. You kick a stone horizontally off a cliff at an initial velocity of 40.0 m/s and it lands at an impact angle of –45.0° on the level ground below the cliff. How high is the cliff? m m m m
5. None of the above.
10/6/17
Oregon State University PH 211, Class #6