The age of a star cluster may be estimated by determining the ________ of the Main Sequence at which stars are just in the process of evolving away to become giant stars
Fill in the blank(s) with correct word
turn-off point
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The term heat in physics is
A. equivalent to temperature. B. equivalent to internal energy. C. the same as work. D. any energy transferred to a body that raises the temperature of the body. E. energy transferred to a body because of a difference in temperature.
When an object is placed 60. cm from a converging lens, it forms a real image. When the object is moved to 40. cm from the lens, the image moves 10. cm farther from the lens. What is the focal length of the lens?
A) 42. cm B) 50. cm C) 40. cm D) 20. cm E) 30. cm
In the metric mks system of units, the letter s stands for ______________
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Seasonal changes in the darker surface features of Mars are due to ________
Fill in the blank(s) with correct word