Suppose that you stand, motionless, on the floor. Regarding the force by the floor on your feet,
A) there is an upward force by the floor on your feet, and this force causes you to accelerate upwards.
B) as long as you remain motionless, there is no force by the floor on your feet.
C) there is an downward force by the floor on your feet, even though you are not accelerating.
D) there is a downward force by the floor on your feet, and this force causes you to accelerate downwards.
E) there is an upward force by the floor on your feet, even though you are not accelerating.
E
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The ____________________ period (or "month") of the Moon is the time required for one revolution of the Moon around Earth with respect to the stars
Fill in the blank(s) with correct word
If a galaxy is located at a distance of 18 Mpc and is found to have recessional velocity of 1170 km/s, what is Hubble's constant based only on this galaxy?
a. 65 km/s b. 75 km/s c. 55 km/s d. 85 km/s e. 95 km/s
When no forces act on moving objects their paths are normally
A) straight lines. B) circles. C) ellipses. D) all of the above
What observed feature of the Milky Way is better explained by the bottom-up hypothesis of galactic formation, as opposed to the monolithic collapse model?
a. The elongated shape of the central bulge of the galaxy b. The different metallicities of the bulge and disk of the galaxy c. The difference in age of globular clusters d. The supermassive black hole found at center of the galaxy e. The very little gas or dust that halo contains