Astronomers try to reconstruct our Galaxy's past from _____
A) its spherical component
B) its disk component
C) its spiral arms
D) the stars of neighboring galaxies
A
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Projectile Motion: A cat leaps to try to catch a bird. If the cat's jump was at 60° off the ground and its initial velocity was 2.74 m/s, what is the highest point of its trajectory, neglecting air resistance?
A. 0.29 m B. 0.58 m C. 10.96 m D. 0.19 m
Compared to its size, the Milky Way is very far away from all other galaxies
Indicate whether the statement is true or false
A 400-g piece of metal at 120.0°C is dropped into a cup containing 450 g of water at 15.0°C. The final temperature of the system is measured to be 40.0°C
What is the specific heat of the metal, assuming no heat is exchanged with the surroundings or the cup? The specific heat of water is 4190 J/(kg?K). A) 1470 J/(kg ? K) B) 2830 J/(kg ? K) C) 3420 J/(kg ? K) D) 3780 J/(kg ? K) E) 4280 J/(kg ? K)
If a substance is radioactive it is definitely
a. dangerous b. emitting alpha particles c. glowing d. useful e. all of the above f. none of the above Indicate whether the statement is true or false