The most abundant element in Earth's core is ________.
A. iron
B. hydrogen
C. oxygen
D. nitrogen
Answer: A
Physics & Space Science
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Heat is:
A. energy transferred by virtue of a temperature difference B. energy transferred by macroscopic work C. energy content of an object D. a temperature difference E. a property objects have by virtue of their temperatures
Physics & Space Science
Earth is approximately 13,000 km in diameter
a. True b. False Indicate whether the statement is true or false
Physics & Space Science
Which has the greater half-life?
A) Oxygen-19 B) Cobalt-60 C) Uranium-238 D) Strontium-90 E) Hydrogen-3
Physics & Space Science
Consider a pipe of length L that is open at both ends. What are the wavelengths of the three lowest-pitch tones produced by this pipe?
A) 4L, 2L, L B) 2L, L, L/2 C) 2L, L, 2L/3 D) 4L, 4L/3, 4L/5
Physics & Space Science