What two observations allow us to calculate mass of the portion of the Galaxy within the Sun's orbit?
A) the Sun's composition and luminosity
B) the Sun's mass and its age
C) the Sun's age and period of the Galactic Year
D) the Sun's mass and velocity in orbit of the Galactic Center
E) the Sun's orbital velocity and its distance from the Galactic Center
E
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Velocity Addition: As shown in the figure, the captain of spaceship A observes spaceship E escaping with a relative velocity of 0.35c. A missile M is fired from ship A directly toward ship E, with a velocity of 0.76c relative to ship A. What does the captain of ship E measure for the velocity of the missile M?
A. 0.56c B. 0.41c C. 0.52c D. 0.48c E. 0.45c
Star ________ have been vital in understanding stellar evolution, finding distances, and mapping the structure of our Galaxy
Fill in the blank(s) with correct word
Two bodies of equal mass m collide and stick together. The quantities that always have equal magnitude for both masses during the collision are
a. their changes in momentum. b. the force each exerts on the other. c. their changes in kinetic energy. d. all of the above. e. only (a) and (b) above.
A disk-shaped space station 125 m in diameter spins at a uniform rate about an axis through its center and perpendicular to the plane of the disk
If the acceleration of a point on the rim of the disk is to be equal to g, how long does it take for the station to make one revolution? Use g = 9.8 m/s2.