About 74% by mass of Earth's crust is composed of the two elements
a. oxygen and iron.
b. aluminum and iron.
c. oxygen and silicon.
d. silicon and aluminum.
c
Physics & Space Science
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If an object's acceleration is positive, its speed must be increasing
Indicate whether the statement is true or false
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Scarps on Mercury are formed by tectonic uplift
Indicate whether the statement is true or false
Physics & Space Science
A moving particle is subject to conservative forces only. When its kinetic energy decreases by 10 J, what happens to its mechanical energy?
A. It increases by 10 J. B. It decreases by 10 J. C. It increases, but not necessarily by 10 J. D. It decreases, but not necessarily by 10 J. E. It remains the same.
Physics & Space Science
The diffraction limit is a limit on:
A. A telescope's size. B. A telescope's angular resolution. C. A telescope's spectral resolution.
Physics & Space Science