Which of the following statements about chain reactions is true?
A. The key requirement for a chain reaction is that more neutrons are produced than that are absorbed.
B. Three or more neutrons must be released to sustain a chain reaction.
C. Only uranium isotopes are capable of supporting a chain reaction.
D. A chain reaction will only take place when a critical mass of material has been assembled.
E. It is not possible to stop or control a chain reaction once it has been started.
Answer: A
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While driving along the highway at a constant speed of 60 km/h you apply the brakes until the car slows to 40 km/h. When you suddenly release the brakes, the car tends to
A. continue moving at 40 km/h. B. decrease in speed if no other forces act. C. momentarily regain its higher initial speed. D. need more information
What is the predominant technique used to extract minerals?
A. surface mining B. underground mining C. aerial mining D. in-situ injection
Crinoids are examples of early plants. Indicate whether the statement is true or false
Which of the following phase changes does not involve a liquid?
A) evaporation B) melting C) sublimation D) None, they all involve a liquid.