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
Their dog, Spot, starts from Arthur's side at the same time and runs back and forth between them. By the time Arthur and Betty meet, what is Spot's displacement?
60 m in the direction of Betty
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The apparent visual magnitude of a star is a measure of the star's
a. size. b. intensity. c. distance. d. color. e. temperature.
A 1,800 kg car is traveling at 20.0 m/s NORTHEAST. The momentum of the car is
A. 18,000 kg m/s NORTHEAST. B. 20,000 kg m/s NORTHEAST. C. 28,000 kg m/s NORTHEAST. D. 32,000 kg m/s NORTHEAST. E. 36,000 kg m/s NORTHEAST.
If the tilt of Earth’s axis to its orbital plane were 40 degrees, instead of 23 1/2, but its distance from the Sun remained the same, what would happen to the seasons?
a. They wouldn’t change much. b. They would become less extreme—winter and summer would be more alike. c. They would become more extreme—winter colder and summer warmer.
What is Olbers' paradox and what is its resolution?
What will be an ideal response?