Significant Figures: What is 
expressed to the correct number of significant figures?
Fill in the blank(s) with the appropriate word(s).
1.22
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When a star of mass comparable to the Sun dies, it becomes a black hole
Indicate whether the statement is true or false
A ball of mass 5 kg attached to a string is swung in a horizontal circle of radius 0.5 m. If the tension in the string is 10 N, the work done by the tension in one revolution is ________ J.
Fill in the blank(s) with the appropriate word(s).
How is Einstein's famous equation, E = mc2, important in understanding the Sun?
A) The Sun has a magnetic field strong enough to influence the atmospheres of the planets. B) The Sun's surface temperature is about 6,000° Celsius. C) The Sun is extremely massive. D) The Sun generates energy to shine by losing 4 million tons of mass each second.
Solar power is commonly used to produce
A) heat. B) electricity. C) both of these