ASTR Ch5_6 Correctly Answered Questions 2024.

ASTR Ch5_6 Correctly Answered Questions 2024. According to Aristotle, which of the following would be an example of violent motion? - CORRECT ANSWER a person pushing a car along the street Galileo found that - CORRECT ANSWER heavy and light objects fall at the same rate. Newton concluded that some force had to act on the moon because - CORRECT ANSWER a force is needed to pull the moon away from straight-line motion. The radius of Earth is 6378 km. The force of gravity on a 1 kg ball at Earth's surface is 9.8 kg m s-2. What is the force of gravity on this same ball when the ball is located 12,756 km from Earth's center? Hint [ G = 6.67´10-11 N m2 kg-2 , equation and note that 12,756 km = 2x6378 km = 2RE therefore, the new g is equation] - CORRECT ANSWER 2.45 kg m s-2 Tides occur - CORRECT ANSWER at new moon and full moon. How much energy is released if 2 kg of matter is converted into pure energy? Hint: E = mc2 and c = 3.0´108 m/sec - CORRECT ANSWER 1.8´1017 joules What is meant by spectral resolution? - CORRECT ANSWER It is a measure of how close two spectral lines can be distinguished. What is the purpose of adaptive optics? - CORRECT ANSWER to eliminate the distorting effects of atmospheric turbulence for telescopes on the ground Which of the following wavelength regions cannot be studied with telescopes on the ground? - CORRECT ANSWER -xrays -ultraviolet