An astronomical telescope has an objective lens with focal length 800 mm and produces an angular magnification of 40 when used with only its eyepiece. What is the distance between the objective lens and the eyepiece when this telescope is in use?
1.800 mm
2.820 mm
3.780 mm
4.One cannot find this length until one knows the focal length of the eyepiece.
2
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You discover an impact crater that is 10 kilometers across. Which of the following can you conclude?
A) It was created by the impact of an object about 10 kilometers across. B) It was created within the past 10 million years. C) It was created within the past 1 billion years. D) It was created by the impact of an object about 1 kilometer across.
________ is the most significant force that determines the evolution of stars.
A. Energy B. Gravity C. Luminosity D. Temperature
The slope of a line connecting two points on a position versus time graph gives
A) instantaneous velocity. B) average velocity. C) instantaneous acceleration. D) average acceleration E) none of the given answers.
The Pioneer probes carry what kind of physical time capsule?
A) a small engraved plaque B) a gold-plated record containing pictures, multilingual greetings and music C) a DVD containing pictures D) these probes do not carry a physical time capsule