When you step off a bus moving at 3 m/s, your horizontal speed when meeting the ground is
A. about 3 m/s.
B. zero.
C. less than 3 m/s but greater than zero.
D. greater than 3 m/s.
Answer: A
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Why might the following nuclear reaction not be very good for energy production in a fission reactor? Fe ? Si + Mg + 3 neutrons
A) The material only produces a few neutrons so the chain reaction will not be very efficient. B) The reactants are too small to obtain energy from the missing mass due to strong nuclear force. C) The products are not the right size to obtain much energy from the missing mass due to the strong nuclear force. D) The mass of the byproducts is too high and therefore the energy released will not be high enough. E) Interatomic attraction between the products will impede the separation of the atoms from the unstable nuclei.
What is eutrophication?
a. A set of physical, chemical, and biological changes in an environment when there is an excessive release of nutrients in the water b. A large plankton bloom dominated by one species c. The removal of oxygen from the water of an area d. The manmade changes to the environment
Cloud seeding using silver iodide only works in?
a. ?cold clouds composed entirely of ice crystals. b. ?warm clouds composed entirely of water droplets. c. ?cold clouds with a low ratio of ice crystals to water droplets. d. ?clouds with more ice crystals than supercooled droplets. e. ?clouds that can produce precipitation.
Which of the following physical features are found on both Mars and Earth?
A) Active volcanoes B) Heavily cratered landscape preserved from early planetary histories C) Oceans with liquid water D) Erosional features related to flowing water