Where is most of the water on Mars believed to be?
What will be an ideal response?
In the polar caps and a layer of permafrost just below the surface.
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Light from a He-Ne laser of wavelength 633 nm passes through a circular aperture. The resulting pattern is observed on a screen 4.0 m behind the aperture, where the width of the central bright circle is 1.1 cm. What is the diameter of the hole?
A) 4700 ?m B) 32,000 ?m C) 9.8 ?m D) 560 ?m
A student adds two vectors with magnitudes of 200 and 70 . Which one of the following is the only possible choice for the magnitude of their sum?
a. 100 c. 200 b. 280 d. 70
Which statement about seismic waves is TRUE?
A) Only S waves can travel through liquid. B) P waves travel faster, and thus arrive sooner than do the S waves. C) In the shadow zones, neither type is observed. D) S waves can travel though the outer core, but P waves cannot. E) On the far side of the Earth, only the S waves on the surface can be detected.
Concrete is a composite with a matrix of hydrated _________cement, and the reinforcement is aggregate with sizes ranging from fine sand to coarse rocks.
Fill in the blank(s) with the appropriate word(s).