In which stage of a star's evolutionary cycle does it spend the most time?
A. the post-main sequence
B. the pre-main sequence
C. the main sequence
D. It depends on the mass of the star.
Answer: C
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Determine the temperature associated with the radiation emitted from a black body radiator such that its color appears to be (a) Red, (b) Blue, (c) Green, (d) Yellow, and (e) Purple.
What will be an ideal response?
Power: A resistor operated at 120 V dc is rated at 1.40 kW.(a) What is the normal operating current through the resistor?(b) What is the resistance of the resistor?
What will be an ideal response?
The water level in a water tower is 50.00 m above the ground. What is the gauge pressure of the water at a faucet that is 2.000 m above the ground?
A. 500,200 
B. 470,400
C. 451,300
D. 422,400
E. 410,400
Two astronauts, of masses 60 kg and 80 kg, are initially right next to each other and at rest in outer space. They suddenly push each other apart. What is their separation after the heavier astronaut has moved 12 m?
A) 9.0 m B) 16 m C) 21 m D) 24 m E) 28 m