Superconductors have been discussed as a means for electrical energy storage. Because they are resistanceless, a current once started in a loop would continue without loss. If a current of 1.0 × 10^4 A were started in a huge toroidal coil of radius 1.0 km and inductance 50 H, how much electrical energy (in kWh) could be stored?
a. 300 kWh
b. 480 kWh
c. 690 kWh
d. 840 kWh
c
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The net force acting on a 6.0-kg object is given by Fx = (12 – x) N, where Fx is in newtons and x is in meters. How much work is done on the object as it moves from x = 0 to x = 12 m?
a. 120 J b. 72 J c. 36 J d. 18 J
Addition by 1. Components: Vector 
has a magnitude of 6.0 m and points 30° east of south. Vector 
has a magnitude of 4.0 m and points 30° west of north. The resultant vector 
+ 
is given by
A. 2.0 m at an angle of 30° north of west. B. 2.0 m at an angle of 30° east of south. C. 10.0 m at an angle of 60° north of west. D. 10.0 m at an angle of 60° east of south. E. 1.0 m at an angle of 60° north of west.
Briefly summarize the differences between terrestrial and jovian planets
What will be an ideal response?
What is the ultimate fate of an open universe?
A) the Big Crunch B) Stars will expand away from each other and galaxies effectively "evaporate." C) All matter decays to a low-density sea of photons and subatomic particles. D) All matter eventually ends up in massive black holes. E) Individual stars die but their gas is recycled through the interstellar medium and new stars form in a never-ending process.