Suppose a small, new planet were discovered at a distance of 4 AU from the Sun. According to Kepler's third law, what would be its period?
8 years
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What kind of observations can astronomers use to study Io's volcanoes?
A) spectroscopy to determine the composition of the plumes B) infrared images to study warm plumes on Io's night-side C) visible-light images to study the distribution of sulfur compounds on its surface D) visible-light images to study plumes using reflected sunlight E) all of the above
A 5.00-m-long uniform ladder, weighing 200 N, rests against a smooth vertical wall with its base on a horizontal rough floor, a distance of 1.20 m away from the wall. The coefficient of static friction between the ladder and the floor is 0.200
How far up the ladder, measured along the ladder, can a 600-N person climb before the ladder begins to slip? A) 1.50 m B) 1.26 m C) 1.05 m D) 3.95 m E) 4.56 m
When you tune a radio to a certain station, you match the frequency of the internal electrical circuit to the frequency of that radio station, which illustrates
A) forced vibrations. B) resonance. C) beats. D) reverberation. E) wave interference.
Why does the burning of fossil fuels increase the greenhouse effect on Earth?
A) The heat from the flames warms the planet. B) Burning fossil fuels releases carbon dioxide into the atmosphere. C) Burning fossil fuels depletes the amount of ozone, thereby warming the planet. D) Burning fossil fuels produces infrared light, which is then trapped by existing greenhouse gases.