Why do sunspots appear dark?
A. They are made of different material than the surrounding gases.
B. They are cooler than the surrounding gases.
C. Their magnetic fields block light.
D. They are hotter than the surrounding gases.
Answer: B
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The _________electrode is a 1-molar solution of hydrogen ions (H+ ) in HCl in contact with hydrogen gas at 1 atmosphere of pressure.
Fill in the blank(s) with the appropriate word(s).
Suppose a future telescope is able to take a spectrum of a terrestrial planet around another star and reveals the presence of significant amounts of ozone. What would this mean, and why?
What will be an ideal response?
A 40.0-kg crate is being lowered by means of a rope. Its downward acceleration is 2.00 m/s2. What is the force exerted by the rope on the crate?
A) 40.0 N B) 80.0 N C) 232 N D) 312 N E) 472 N
Which pulls on the oceans of Earth with the greater force?
A) the Moon B) the Sun C) The Sun and the Moon both pull the same.