The magnetic field in a superconducting solenoid is 3.0 T. How much energy per unit volume is stored in the solenoid, in J/m3? ?0 = 4? × 10^?7 T ? A/m
3.6 × 10^6 J/m3
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Two electrons (e1 and e2) and a proton (p) lie on a straight line, as shown. The directions of the force of e2 on e1, the force of p on e1, and the total force on e1, respectively, are: ______e1________e2________p
A) ?, ?, ? B) ?, ?, ? C) ?, ?, ? D) ?, ?, ? E) ?, ?, ?
According to the planetary migration model, the jovian planets are thought to have formed
A) in the orbit where they are now. B) further from the Sun than they are now. C) in another solar system. D) closer to the Sun than they are now. E) none of the above.
The word "comet" comes from the Greek word for which of the following?
A) bright B) hair C) fuzzy D) tail
Consider a solid sphere and a hollow sphere of the same radius, both made of material with the same density. They are both rotating on their axes with the same angular speed. Which one has the higher angular momentum?
1.the solid sphere 2.the hollow sphere 3.They both have the same angular momentum. 4.It is impossible to determine.