Why are star clusters ideal sites to study stellar evolution?
What will be an ideal response?
All members are about the same age, composition, and distance, so the brighter ones are really more luminous. They still differ in mass, so the more massive ones evolve a lot faster.
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How were the silver ions separated from the lead ions?
A series circuit consists of three identical lamps connected to a battery as shown in Figure OQ28.15. The switch S, originally open, is closed. What happens to the potential difference across lamp A?
A container with rigid walls is filled with 4 mol of air with CV = 2.5R. How much does the internal (thermal) energy change if the temperature of the air rises from 16°C to 437°C? The ideal gas constant is R = 8.314 J/mol ? K
A) 35 kJ B) 421 J C) 3.5 kJ D) 8.75 kJ
Which diagram correctly shows the magnetic field lines created by a circular current loop in which current flows in the direction shown?
A.
B.
C.
D.
E.
