A method for identifying a black hole is to:
A) look for voids in the star fields.
B) look for their effects on nearby companions.
C) locate a visible star that disappears when the black hole passes in front of it.
D) search for radio waves from the accretion disk.
E) search for their pulsar signal.
B
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If we compress the entire history of the universe into one year, the Earth formed
A) in early February B) in early September C) in late December D) in late September
Estimate the mass diffusivity of methane into air at 300 K, assuming ideal gas behavior.
What will be an ideal response?
The type of elements present in a gas can be determined by studying the ____
a. number of ionized atoms in the gas b. energy of the electrons being emitted by the gas c. number of photons being absorbed or emitted by the gas d. wavelengths of photons absorbed or emitted from the gas e. number of excited atoms in the gas
A large vat contains 1.000 L of water at 20°C. What volume will this water occupy when it is heated up to 80°C? Water has a volume expansion coefficient of 210 × 10-6 K-1
A) 1.600 L B) 1.013 L C) 0.987 L D) 0.9987 L