Arthur and Betty start walking toward each other when they are 100 m apart. Arthur has a speed of 3.0 m/s and Betty has a speed of 2.0 m/s. How long does it take for them to meet?
What will be an ideal response?
20 seconds
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If a sheet containing a single slit is heated (without damaging it) and therefore expands, what happens to the angular location of the first-order diffraction minimum?
A) It moves away from the centerline. B) It doesn't change. C) It moves toward the centerline.
Of the four jovian planets, which likely formed first?
A) Jupiter B) Saturn C) Uranus D) Neptune
A 910-kg object is released from rest at an altitude of 1200 km above the north pole of the earth. If we ignore atmospheric friction, with what speed does the object strike the surface of the earth?
(G = 6.67 × 10-11 N • m2/kg2, Mearth = 5.97 × 1024 kg, the polar radius of the earth is 6357 km) A) 4.5 km/s B) 2.2 km/s C) 2.7 km/s D) 3.2 km/s E) 4.8 km/s
Current evidence suggests the universe will continue to expand forever, but some people would prefer if we lived in a recollapsing universe that would eventually stop expanding and start contracting. Based on current understanding, which of the following would have to be true for our universe to fit a recollapsing model?
A) Dark energy does not exist and there is much more matter than current evidence suggests. B) Dark energy is the dominant form of energy in the cosmos. C) The density of dark matter turns out to be greater than the density of dark energy. D) The total density of matter equals the critical density.