Star A has a radius of 200 000 km and a surface temperature of 6 000 K. Star B has a radius of 400 000 km and a surface temperature of 3 000 K. The emissivity of both stars is the same. What is the ratio of the rate of energy radiated by Star A to that of Star B?
4
Physics & Space Science
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Exclusion Principle: In a hydrogen atom, an electron with n = 7 can exist in how many different quantum states?
A. 6 B. 7 C. 15 D. 98
Physics & Space Science
If each element in this circuit has a resistance of 12 
, what is the resistance of the entire circuit?
Physics & Space Science
A plane truss has downward applied load P at joint 2 and another load P applied leftward at joint 5. The force in member 3–5 is:
(A) 0
(B) -P/2
(C) -P
(D) +1.5 P
Physics & Space Science
A gas expands from an initial volume of 30.0 L to a final volume of 65.0 L at a constant pressure of 110 kPa. How much work is done on the gas during this expansion?
A) -3.85 kJ B) -10.4 kJ C) -3850 kJ D) -10.4 MJ E) -3.85 MJ
Physics & Space Science