The half-life of uranium-232 is 70 years. The time for 3/4 of a sample of uranium-232 to decay is __________
Fill in the blank(s) with correct word
140 years
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Velma passes Mort at a high speed. Velma and Mort each have identical light-clocks. Mort and Velma both observe both clocks to "tick" simultaneously at 12 noon on both clocks. Velma observes that Mort's next tick occurs
A) before or after or at the same time as her own tick, depending on Velma's precise speed relative to Mort. B) at the same time as the tick on her clock. C) before her own clock ticks. D) after her own clock ticks. E) only when the moon is full.
According to modern science, which of the following best explains why the vast majority of the mass of our solar system consists of hydrogen and helium gas?
A) Hydrogen and helium are the most common elements throughout the universe. B) Gravity only acted on hydrogen and helium. C) All the elements besides hydrogen and helium escaped from the solar nebula before the Sun and planets formed. D) All elements besides hydrogen and helium were swept out of the solar system by the solar wind.
At t = 0 the switch S is closed with the capacitor uncharged. If C = 30 ?F, ? = 50 V, and R = 10 k?, what is the potential difference across the capacitor when I = 2.0 mA?
A. 20 V B. 15 V C. 25 V D. 30 V E. 45 V
A transiting extrasolar planet is observed to block 1% of its host star's light. How does the size of this planet compare to the host star?
A) The planet's radius is 10% of the host star's radius. B) The planet is the same size as the host star. C) The planet's radius is 0.1% of the host star's radius. D) The planet's radius is 1% of the host star's radius.