Is a fuel-cell vehicle properly described as a "heat engine"?
A) Yes, because it uses thermal energy to produce electricity.
B) Yes, because it uses chemical energy to create electric energy.
C) Yes, because it uses thermal energy to do work.
D) No, because it converts chemical energy directly to electric energy.
E) No, because it converts electric energy directly into chemical energy.
D
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The magnetic field amplitude in an electromagnetic wave in vacuum is related to the electric field amplitude by B =
A.
.B.
.C.
D.
.E.
A diatomic molecule consists of two point masses, m1 and m2, separated by a distance r. Find the moment of inertia through the center of mass about an axis perpendicular to the molecular axis
a. m1m2r2/(m1 + m2) b. [(m1m2/m1) + m2]r2 c. (m1 + m2)/m1m2r2 d. (m1 + m1)r2 /m1m2 e. m1m2r2/m1
A 10-inch telescope (25.4 cm in diameter) is used to determine if what appears to be one star is actually two stars
Stars are so far away that they are essentially point sources. How close (in angle) can the two stars be and still be resolved by this telescope if it is focusing light of wavelength of 550 nm? (Consider only the limitation due to diffraction.) A) 6.6 × 10-8 degree B) 1.5 × 10-4 degree C) 2.6 × 10-6 degree D) 3.0 × 10-4 degree E) 4.2 × 10-8 degree
Dams at two different locations are needed to form a lake. When the lake is filled, the water level will be at the top of both dams. Dam #2 is twice as high and three as wide as Dam #1 . How much greater is the force of the water on Dam #2 than the force on Dam #1? (Ignore atmospheric pressure; it is pushing on both sides of the dams.)
a. 24 c. 6 b. 12 d. 3