Two points on a merry-go-round are located at distances from the center r1 and r2, where r1 < r2 . While the merry-go-round is in the process of speeding up to operational speed, which of the following equations involving magnitudes of angular speed, angular acceleration, and tangential speed for these points is incorrect?
a. ?1 = ?2
b. ?1 = ?2
c. vt1 = vt2
d. All of the equations are correct.
c
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Type II supernovae and star forming regions are related to one another because:
A) they both contain ionized hydrogen. B) they both involve high mass ionizing stars. C) the shock waves of a supernova can trigger star formation. D) as a result of both processes, lighter elements are transformed into heavier elements. E) All of the above.
Which of the following statements about X-rays and radio waves is not true?
A) X-rays have shorter wavelengths than radio waves. B) X-rays and radio waves are both forms of light, or electromagnetic radiation. C) X-rays have higher frequency than radio waves. D) X-rays have higher energy than radio waves. E) X-rays travel through space faster than radio waves.
In Procedure 2, what is the relationship between the acceleration and the slope of the curve? (Hint: How does Eq. 4.2 in the Laboratory Guide for acceleration compare with the equation given for slope?)
A black hole is _____
a. an object so dense that light cannot escape its surface b. a neutron star that has exceeded the Chandrasekhar limit c. a theoretical model that has never been observed d. an observed object that is not well understood e. the result of a neutron star merger