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Answers to Questions
- In mixtures the various substances are not bonded together chemically, as they are in a compound.
- Conduction, convection, and radiation.
- Inertia.
- The fulcrum.
- Friction.
- A primitive counting machine, using beads strung on a frame.
- Fission and Fusion.
- Centripetal force.
- Because streamlining reduces wind resistance which is a form of friction.
- Pulleys.
- They were used for simple time-keeping.
- It was the first jet plane.
- It was the first succesful helicopter.
- A sand-glass.
- The sundial.
- Refraction.
- Those wired parallel.
- True.
- Levers.
- It is the only shape that cannot fall back down the hole.
