The ____________________ of the Sun is composed of ionized gas and produces a continuous spectrum with a superimposed emission spectrum
Fill in the blank(s) with correct word
corona
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A 7.0-kg bowling ball strikes a 2.0-kg pin. The pin flies forward with a velocity of 6.0 m/s; the ball continues forward at 5.0 m/s. What was the original velocity of the ball?
a. 4.0 m/s c. 6.7 m/s b. 5.7 m/s d. 3.3 m/s
A rocket is launched from the origin with an acceleration of 20.0 
at an angle of 30.0 degrees above the horizontal. The launch acceleration lasts for 2.00 seconds at which time the fuel is exhausted. The rocket then falls with an acceleration of 9.80 
downward. What is the maximum velocity in the upward direction?
A. 20.0 m/s B. 25.0 m/s C. 30.0 m/s D. 35.0 m/s E. 40.0 m/s
Accelerated charges radiate electromagnetic waves
Indicate whether the statement is true or false
Which of the following statements about quantum tunneling is not true?
A) Although it has been observed to occur, it violates all other known laws of nature and explaining it therefore represents a major challenge to physicists. B) It is used in modern electronics and, in fact, our modern-day computers would not work without it. C) It plays a crucial role in nuclear fusion in the Sun. D) It allows electrons and other subatomic particles to pass through wall-like energy barriers even when it seems they do not have enough energy to get through the barriers.