The half-life of tritium is 12.3 y. What is its mean life (time constant)?
What will be an ideal response?
17.7 y
Physics & Space Science
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When an oxygen-19 nucleus undergoes beta decay, the nucleus formed is that of
a. nitrogen-18. b. oxygen-18. c. fluorine-19. d. carbon-14.
Physics & Space Science
What is the biggest misconception concerning the definition of geography?
What will be an ideal response?
Physics & Space Science
A 2000-kg sailboat experiences an eastward force of 2000 N by the ocean tide and a wind force against its sails with magnitude of 6000 N directed toward the northwest (45° N of W). What is the direction of the resultant acceleration?
a. 60° N of E c. 30° N of E b. 62° N of W d. 74° N of W
Physics & Space Science
A barbell is easier to twist when its weights are
a. close to the axis of rotation b. near the ends of the bar c. heavy d. light e. none of the above
Physics & Space Science