The separation of different isotopes of a particular element can be difficult because
A. all isotopes are dangerous because of their radioactivity.
B. the masses of the isotopes are the same.
C. neutrons are so small.
D. chemical reactions happen the same way for the isotopes.
Answer: D
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Every second, the Sun converts about 600 million tons of hydrogen into 596 million tons of helium. The remaining 4 million tons of mass is
A) ejected into space in a solar wind. B) ejected into space by solar flares. C) converted to an amount of energy equal to 4 million tons times the speed of light squared. D) reabsorbed as molecular hydrogen.
A car traveling at 22 m/s comes to an abrupt halt in 0.1 second when it hits a tree. What is the deceleration of the car?
A) 110 m/s2 B) 220 m/s2 C) 800 m/s2 D) 880 m/s2 E) need more information
Saturn's cloud layer is over twice as thick as Jupiter's cloud layer
Indicate whether the statement is true or false