What elements do the symbols Fe, Na, Au, and Hg stand for?
a. aluminum, nitrogen, silver, tungsten
b. iron, sulfur, silver, ytterbium
c. iron, sodium, silver, mercury
d. iron, sodium, gold, mercury
e. none of the above
D
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A brass bar (E 5 110 MPa) of length L 5 2.5 m has diameter d1 5 18 mm over one-half of its length and diameter d2 5 18 mm over the other half. Compare this nonprismatic bar to a prismatic bar of the same volume of material with constant diameter d and length L. The elongation of the prismatic bar under the same load P 5 25 kN is approximately:
(A) 3 mm
(B) 4 mm
(C) 5 mm
(D) 6 mm
In what constellation is the Sun be located at the moment of the March equinox?
A) Pisces B) Aries C) Orion D) Taurus E) Andromeda
A scientific model must make a testable prediction
Indicate whether the statement is true or false
When a single boxcar in the freight yard hooks onto a stationary string of four boxcars, there is some kinetic energy lost. Which of the following could account for the missing energy?
A. Sound energy in the loud CLANG when they hook together and heat energy in the clamping mechanism between cars as it opens and then captures the fifth boxcar B. Heat energy in the clamping mechanism between cars as it opens and then captures the fifth boxcar C. Sound energy in the loud CLANG when they hook together