A sonic boom cannot be produced by
A) an aircraft flying slower than the speed of sound.
B) a whip.
C) a speeding bullet.
D) all of the above
Answer: A
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Three resistors, 90 ?, 40 ?, and 60 ?, are wired in series and connected to a 120-V battery. What is the equivalent resistance for this circuit?
a. 190 ? b. 19 ? c. 0.053 ? d. 216000 ?
About how hot was the Big Bang when matter and energy "decoupled"?
A) 900 million K B) 15 million K C) 3,000 K D) 300 K E) 2.73 K
During an isothermal process, 5.0 J of heat is removed from an ideal gas. What is the work done in the process?
A. zero B. -5.0 J C. +5.0 J D. none of the above
The matter field of a hydrogen atom could best be described as
A) a probability pattern. B) an electromagnetic wave. C) a cloud of photons. D) a collection of electrons.