A scientist observes a new phenomenon that disagrees with his explanation or hypothesis. Following the scientific method, he should- modify his hypothesisTwo spaceships that have different masses but rocket engines of identical force are at rest. If they fire rockets at the same time, which ship will speed up faster?- The one with the lower massThe mass of the Sun is about 333,000 times the mass of the Earth. Therefore, the gravitational force with which the Sun pulls onthe Earth is- the same as the gravitational force with which the Earth pulls on the Sun.In the Greek era, it was almost universally believed that- the Earth was at the center of the universe.The major reason why astronomers seek funds to build larger telescopes is- to collect more light fromdistant objects.To which point in a planetary orbit does the word “aphelion” refer?- The point farthest from the SunWhere would you look to see a planet rise when it is in retrograde motion?- Near the Eastern HorizonAccording to Newton's laws, a force must be acting whenever- the direction of an objects motionchanges.The inaccuracy in Copernicus' theory of the solar system was that- he placed planets in circular orbits.What is the relationship between color and wavelength for light?- Wavelength increases from violet to redThe asteroid Ceres orbits the Sun at an average distance of 2.8 AU. What is Ceres' orbital period around the Sun?- 4.68 yearsWhich of the following would cause the Earth’s gravitational force on the Moon to increase by the largest amount?- Move the moon to half its current distance from the Earth.Halley's Comet returns to the Sun's vicinity approximately every 76 years in an elliptical orbit. According to Kepler's third law, what will be the semi-major axis of this orbit?- 17.9 AUWhat path would a planet (like the Earth!) take if the force of gravity from the Sun were to be suddenly removed?- The planet would move in a straight line tangential to its present orbit.A space probe is put into a circular orbit around the Sun at a distance of 4 AU from the Sun. According to Kepler's third law, how long will it take this probe to orbit the Sun once?- 8 yearsAn electrical spark, such as lightning, generates electromagnetic radiation over a wide range of wavelengths. How much longer will a pulse of radio energy take to travel between two detector
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- Fall '09
- Astronomy, Planet, Kepler's laws of planetary motion, Celestial mechanics