Distinguish between TMA and AMA
TMA is the ratio of the distance the input force moves to the distance the output force
moves. AMA is the ratio of the output force to the input force of any machine.
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Suppose you are head of NASA two decades from and have to make some budget cuts. Your agency has been planning four different missions to search for life in the solar system, and you need to cancel the least promising one. Which one do you cancel?
A) a mission to dig beneath an ancient Martian river bed B) a mission to explore the ice geysers of Saturn's Moon Enceladus C) a mission designed to plunge deep beneath Jupiter's cloud layers D) a mission to drill through the icy surface of Jupiter's Moon Europa
In space there is nothing for the rocket to "push against" so how does it accelerate?
What will be an ideal response?
Which expands more when the temperature is lowered? Equal volumes of
A) iron. B) wood. C) helium. D) water at 4°C. E) none expand when the temperature is lowered
Certain types of sunglasses are very effective at diminishing light reflected from surfaces because of
a. interference b. diffraction c. specular reflection d. diffuse reflection e. polarization