Which of the following gases in Earth's atmosphere is not primarily a product of volcanic outgassing?
A) water (H2O)
B) nitrogen (N2)
C) oxygen (O2)
D) carbon dioxide (CO2)
C) oxygen (O2)
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A composite beam is made up of a 90 mm 5 160 mm wood beam (Ew 5 11 GPa) and a steel bottom cover plate (90 mm 3 8 mm, Es 5 190 GPa). Allowable stresses in wood and steel are 6.5 MPa and 110 MPa, respectively. The allowable bending moment about the z axis of the composite beam is most nearly:
(A) 2.9 kN?m
(B) 3.5 kN?m
(C) 4.3 kN?m
(D) 9.9 kN?m
When we say that the Sun is a ball of plasma, we mean that ________
A) the Sun is made of material that acts like a liquid acts on Earth B) the Sun is roughly the same color as blood C) the Sun is made of atoms and molecules D) the Sun consists of gas in which many or most of the atoms are ionized (missing electrons)
The Van Allen belts are cloud layers in the jet streams of the stratosphere, similar to the belts that Galileo saw on Jupiter
Indicate whether the statement is true or false
A supersonic plane passes overhead at a speed of 500 m/s. If you hear the sonic boom (shock wave) 4.00 s after the plane is directly overhead, at what altitude is the altitude the plane flying? Assume the speed of sound in air is 340 m/s
A) 1.36 km B) 2.16 km C) 1.85 km D) 2.45 km E) The plane is not flying fast enough to produce a shock wave.