Heat flows spontaneously from a hot object to a cold one
What will be an ideal response?
This does occur.
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In the unified model, an accretion disk viewed from the side will cause ____ to be present in the spectrum of a Seyfert galaxy
a. narrow absorption lines b. broad absorption lines c. narrow spectral lines d. broad emission lines e. no absorption lines
A center or an edge of the Universe would be a special place, contradicting the cosmological principle
a. True b. False Indicate whether the statement is true or false
A jar holds 2.0 L of ideal nitrogen gas, N2, at STP. The atomic mass of nitrogen is 14.0 g/mol, the ideal gas constant is R = 8.31 J/mol ? K, Avogadro's number is NA = 6.022 × 1023 molecules/mol, and 1.00 atm = 101 kPa
(a) How many moles of nitrogen are in the jar? (b) How many nitrogen molecules are in the jar? (c) What is the mass of the nitrogen in the jar?
What is the Q of the reaction 
The rest mass of the proton is 938 MeV/c2 and of the neutral point is 135 MeV/c2
A. 187 MeV B. 135 MeV C. 938 MeV D. -187 MeV E. -135 MeV