Which of these does NOT exist?
A) a million solar mass black hole
B) a 6 solar mass black hole
C) a 6.8 solar mass neutron star
D) a 1.0 solar mass white dwarf
E) a 0.06 solar mass brown dwarf
C
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What is the purpose of the negative sign in Fourier’s law of conduction heat transfer?
What will be an ideal response?
The pair of water-filled caissons of the Falkirk Wheel have equal weights whenever
A) they carry equal-weight floating boats. B) one carries a heavy floating boat and the other only water. C) they carry unequal weights of floating boats. D) all of the above E) none of the above
The equivalent resistance of any parallel branch in a circuit is
A) often less than the resistance of the lowest resistor. B) always less than the resistance of the lowest resistor. C) usually half the value of the lowest resistor. D) none of the above
One way to heat a gas is to compress it. A gas at 3.0 atm at 27°C is compressed to three tenths of its original volume, and it reaches 35 atm pressure. What is its new temperature?
a. 186 K b. 95°C c. 1 050°C d. 777°C e. 389 K