The lifetime of a free neutron is 887 s. If a neutron moves with a speed 2.9 × 10^8 m/s relative to an observer in the lab, what does the observer measure the neutron's lifetime to be?
3,464 s
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The acceleration of an object as a function of time is given by a(t) = (3.00 m/s3)t, where t is in seconds. If the object is at rest at time t = 0.00 s, what is the velocity of the object at time t = 6.00 s?
A) 18.0 m/s B) 54.0 m/s C) 0.00 m/s D) 15.0 m/s E) 108 m/s
Which of the following is not evidence for plate tectonics on Earth?
A) some continental boundaries fit together like pieces of a jigsaw puzzle B) similar rocks and fossils are found in different continents C) high ocean ridges between the continents D) existence of volcanoes E) earthquakes
When we see a region of a planet that is not as heavily cratered as other regions, we conclude that
A) the planet formed after the age of bombardment and missed out on getting hit by leftover planetesimals. B) the surface in the region is older than the surface in more heavily cratered regions. C) the planet is rotating very slowly and only one side was hit by impactors. D) the surface in the region is younger than the surface in more heavily cratered regions. E) there is little volcanic activity to create craters.
Which of the following is a correctly balanced equation?
A) P4 + 6 H2 ? 4 PH3 B) 1 P4 + 6 H2 ? 4 PH3 C) 0 P4 + 6 H2 ? 4 PH3 D) 2 P4 + 12 H2 ? 8 PH3 E) P4 + 3 H2 ? PH3