The center of gravity for each truck is marked X. Which truck(s) will tip over?
1) Truck 1
2) Truck 2
3) Truck 3
4) All will tip.
This is because
5) its center of gravity is highest.
6) its center of gravity is lowest.
7) its center of gravity lies beyond a point of support.
8) all the centers of gravity lie above the wheelbases.
Answer: 3, 7
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Dams at two different locations are needed to form a lake. When the lake is filled, the water level will be at the top of both dams. The Dam #2 is twice as high and twice as wide as Dam #1 . How much greater is the force of the water on Dam #2 than the force on Dam #1? (Ignore atmospheric pressure; it is pushing on both sides of the dams.)
a. 2 b. 4 c. 8 d. 16
Two flat rectangular mirrors are set edge to edge and placed perpendicular to a flat nonreflecting surface. The edges of the two mirrors meet at a 30° angle. A light ray that approaches mirror 1 is parallel to mirror 2 . The angle of reflection of that ray from mirror 1 is a. 0°
b. 30°. c. 60°. d. 90°. e. 120°.
Water is vital to life on our planet. Most of Earth's water supply is in the
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As a particle is accelerated to relativistic speeds, laboratory measurements of its momentum show
1) an increase, 2) a decrease, 3) no change, and measurements of its volume show 4) an increase. 5) a decrease. 6) no change.