Four identical particles (mass of each = 0.40 kg) are placed at the vertices of a rectangle (2.5 m × 4.0 m) and held in those positions by four light rods which form the sides of the rectangle. What is the moment of inertia of this rigid body about an axis that passes through the mid-points of the shorter sides and is parallel to the longer sides?
a. 2.2 kg×m2
b. 2.8 kg×m2
c. 2.5 kg×m2
d. 3.1 kg×m2
e. 1.6 kg×m2
C
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The force exerted on a body by moving air is proportional to the projected area of the body. Which falling body will have the larger terminal velocity, a flying squirrel with its wing membranes extended or a grey squirrel with the same mass?
A. Both will have same terminal velocity B. The flying squirrel C. The grey squirrel
Basaltic volcanic eruptions tend to be
A) slow moving and highly viscous. B) very fluid and highly viscous. C) slow moving with a low viscosity. D) very fluid and have a low viscosity.
In the hypothetical atomic interaction shown in figure C9.13, assume that initially the atoms have a total energy of 3 × 10-21 J at r = 0.1 nm. These atoms are
A. Unbound (they will separate to infinity).
B. Bound (they will not separate to infinity).
C. The answer depends on whether the atoms are initially moving toward or away from each other.
If you comb your hair and the comb becomes positively charged, then your hair becomes
A) positively charged. B) negatively charged. C) uncharged.