A right isosceles triangle is cut out from a piece of sheet metal. The two equal sides are 1.0 m long each. How far is the center of gravity from the right angle (90.°) vertex of the triangle?
A) 0.71 m
B) 0.55 m
C) 0.47 m
D) 0.24 m
E) 0.35 m
C
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Answer the following statement(s) true (T) or false (F)
1. A given object always has a specific moment of inertia I, independent of the axis around which it rotates (as long as the axis goes through the object’s center of mass). 2. An isolated star collapses so that its radius is half its original radius. Both its angular momentum and its rotational energy must be conserved.
A ______________ is always shorter than a ______________
a. solar day; sidereal day b. solar day; mean solar day c. sidereal day; solar day d. mean solar day; solar day
In the periodic table, symbols for the elements are arranged according to _____
a. size b. charge c. mass number d. atomic number e. electronegativity gradient
Suppose you want to determine the chemical composition of a distant planet or star. Which of the following will be most useful to have?
A) high spectral resolution B) high angular resolution C) high turbulence D) a radio telescope