A spaceship is moving past you at a speed very close to the speed of light. If you could somehow watch the people inside it over a long period of time, what would you conclude?
A) They are aging more rapidly than you.
B) Their mechanical clocks go slower than yours, but the people are aging at the same rate as you.
C) Their time is the same as your time.
D) They are aging more slowly than you.
D
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An atom which has 4 protons and 6 neutrons will be electrically neutral if it contains
A) 4 electrons. B) 6 electrons. C) 10 electrons. D) at least one electron.
One way to expand yields of crops is to increase the area under cultivation. This has few impacts other than an expansion of crop supply
What will be an ideal response?
What is an advantage of using chlorine gas to disinfect drinking water supplies?
A) It provides residual protection against pathogens. B) It gives the water a fresh taste. C) Residual chlorine in water helps to whiten teeth. D) Excess chlorine is absorbed in our bodies as a mineral supplement.
The free-stream flow outside a boundary layer is:
(A) Either laminar or turbulent, depending on the Reynolds number (B) A smooth flow free of disturbances (C) An irrotational flow (D) Neither laminar nor turbulent