Stellar masses are determined by observing ________ stars
Fill in the blank(s) with correct word
binary
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Galactic collisions ____
a. are very rare, since few galaxies are in clusters b. will cause stars in each galaxy to collide and trigger supernova events c. often trigger bursts of star formation d. only happen in poor clusters e. usually break large galaxy into several small ones
The vast majority of stars in a newly formed star cluster are
A) very high-mass, type O and B stars. B) red giants. C) about the same mass as our Sun. D) less massive than the Sun.
A stunt pilot weighing 0.70 kN performs a vertical circular dive of radius 0.80 km. At the bottom of the dive, the pilot has a speed of 0.20 km/s which at that instant is not changing. What force does the plane exert on the pilot?
A. 3.6 kN up B. 4.3 kN up C. 2.9 kN down D. 2.9 kN up E. 5.8 kN down
An object is placed 100 cm in front of a lens of focal length 20 cm. A second lens is placed 35 cm beyond the first, this second lens having a focal length of 8.0 cm. The final image
A) is virtual and upright. B) is real and upright. C) is virtual and inverted. D) is real and inverted. E) cannot be determined with the information given.