If the breakers at a beach are separated by 5.0 m and hit shore with a frequency of 0.20 Hz, with what speed are they traveling?
What will be an ideal response?
1.0 m/s
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The sum of the kinetic and potential energies of an object is conserved only when the object is under the influence of conservative forces
Indicate whether the statement is true or false
An ice skater performs a pirouette (a fast spin) by pulling in his outstretched arms close to his body. What happens to his rotational kinetic energy about the axis of rotation?
A) It changes, but it is impossible to tell which way. B) It increases. C) It does not change. D) It decreases.
Country X's population is doubling every 10 years. What is its rate of population growth?
A) It is impossible to answer this without knowing country X's population. B) 2% per year C) 7% per year D) 10% per year E) 14% per year
What makes an ordinary bar magnet magnetic?
a. Electrons inside it are themselves tiny magnets. b. The magnetic fields of electrons in the magnet are aligned and add together. c. It contains magnetic charges. d. none of the above