Earth's axis is tilted at an angle of _______________ degrees
Fill in the blank(s) with correct word
23.4
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If a gray opaque body has emissivity of 0.6, what is its reflectivity?
What will be an ideal response?
A stunt pilot performs a circular dive of radius 800 m. At the bottom of the dive (point B in the figure) the pilot has a speed of 200 m/s which at that instant is increasing at a rate of 20 m/s2. What acceleration does the pilot have at point B?
?
?
A.
m/s2B.
m/s2C.
m/s2D.
m/s2E.
m/s2A sphere is made up of two layers: The first is lead (density 11340
and is of radius R. The second is tin, (7310
and is concentric with the first, from radius R to radius 2R. The sphere is placed in a pool of mercury (density 13600 
How much of the volume of the sphere is below the surface?
A. 68.5% B. 57.5% C. 57.0% D. 64.2%
Pour vinegar onto beach sand from the Caribbean and the result is a lot of froth and bubbles. Pour vinegar onto beach sand from California, however, and nothing happens. Why?
A) Beaches in tropical climates generally have remnants of volcanic deposit not present in California sand. These deposits contain soil with organic residue. Vinegar's acetic acid reacts with organic matter. B) The pH of the warm sands of tropical waters is well into the basic range, unlike the beach sand in California. Therefore, the acidic vinegar reacts with Caribbean beach sand but not with sand from California. C) Beach sand from the Caribbean and many other tropical climates is made primarily of the calcium carbonate remains of coral and shelled creatures. Vinegar is an acid and the calcium carbonate is a base. D) Caribbean beach sand contains deposits from the mouth of the Mississippi river which carries with it a great deal of contamination from urban waste. These warm water contaminates react with the acid in vinegar.