The exhaust product from a hydrogen fuel cell is
A) carbon dioxide.
B) methane.
C) pure water.
D) nitric acid.
Answer: C
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When weight is applied to the top of a stone arch, the stone blocks in the arch undergo
A) tension. B) compression. C) expansion. D) none of the above
A uniform rod is 2.0 m long. The rod is pivoted about a horizontal, frictionless pin through one end. The rod is released from rest at an angle of 30° above the horizontal. What is the angular acceleration of the rod at the instant it is released?
A. 4.7 rad/s2 B. 6.9 rad/s2 C. 6.4 rad/s2 D. 5.6 rad/s2 E. 4.2 rad/s2
According to Lenz’s Law the direction of the induced current produced by a changing magnetic flux is such as to produce a magnetic field that
A. reinforces the change in the original magnetic flux. B. opposes the change in the original magnetic flux.
In the two-slit experiment, for the condition of dark fringes, the value of m = +1 corresponds to a path difference of 3?/2
Indicate whether the statement is true or false