Most of the craters on the highlands of the Moon were formed
A) approximately 65 million years ago
B) at the end of the Hadean eon approximately 3.85 billion years ago
C) fairly recently during the last million years or so
D) during the period of early bombardment constituting the first few hundred million years of the Earth's history
D
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What is the approximate width of the region inside the black square?
This frame from Figure 16.12 is from a supercomputer model of the formation of one of the first stars in the universe. Color indicates gas temperature: Blue and green represent cool gas (100—300 K), orange and red represent warm gas (500—3000 K), and yellow represents gas at intermediate temperatures (300—500 K). Use the information in the figure to answer the following questions.
A light bulb used in a slide projector draws a current of 6 amperes when operating on 120 volts.The resistance of the light bulb is __________
Fill in the blank(s) with correct word
Anika and Sam are astronauts floating in space outside their spaceship. They are tethered together by a rope of length 10.5 m. They both begin pulling on the rope at the same time. Anika has mass of 80 kg, and Sam 100 kg. Because her mass is less, Anika reaches the middle of the rope first. Assuming the center of the rope is at the origin and that Anika and Sam start at 5.25 m and –5.25 m,
respectively, where is Sam when Anika reaches the middle? a. 1.05 m b. 0.53 m c. 9.45 m d. 4.20 m
A 4.00-L container holds half a mole of an ideal gas at a pressure of 18.5 atm. What is the gas temperature? (R = 0.0821 L • atm/mol • K)
a. 1800 K c. 901 K b. 1190 K d. 450 K