The radius of a star is 6.95 × 108 m, and its rate of radiation has been measured to be 5.32 × 1026 W
Assuming that it is a perfect emitter, what is the temperature of the surface of this star? (? = 5.67 × 10-8 W/m2 ? K4 )
A) 6.27 × 103 K
B) 8.25 × 103 K
C) 8.87 × 103 K
D) 3.93 × 107 K
E) 5.78 × 107 K
A
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Solenoid #1 has 100 turns and is 10.0 cm long. Solenoid #2 has 200 turns and is 20.0 cm long. If a current of 0.50 A is carried by #1, what current must #2 carry so that it would produce a magnetic field at its center equal to that in #1?
1.0.25 A 2.0.50 A 3.1.00 A 4.4.00 A
A wooden raft has a mass of 55 kg. When empty it floats in water (density with 64% of its volume submerged. What maximum mass of sand can be put on the raft without sinking it?
What will be an ideal response?
If luminosity depends on radius and temperature, what does flux depend on? _______________
Fill in the blank(s) with correct word
Is it feasible to construct an air-filled parallel-plate capacitor that has its two plates separated by 0.10 mm and has a capacitance of 1.0 F? Why or why not?