A straight wire is bent into the shape shown. Determine the net magnetic force on the wire when the current I travels in the direction shown in the magnetic field

.



a.
2IBL in the ?z direction

b.
2IBL in the +z direction

c.
4IBL in the +z direction

d.
4IBL in the ?z direction

e.
zero

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b

Physics & Space Science

The proton-proton cycle converts all of the mass of the four hydrogen atoms into pure energy

Indicate whether the statement is true or false

(For discussion.) On the basis of the information presented, which do you think is the most plausible resolution of the Collapse Rule’s problems? Why?

A. The decoherence model. B. Some modification of the Time Evolution Rule that allows genuine collapse to occur. C. A human mind, which transcends quantum mechanics, is the agent that collapses quantum states. D. Everett’s many-worlds proposal. E. The QBist idea that state vectors are not real, but rather only reflect the state of what an observer knows. F. Something else (describe).

What is the kinetic energy of an electron that passes undeviated through perpendicular electric and magnetic fields if E = 4.0 kV/m and B = 8.0 mT?

a. 0.65 eV b. 0.71 eV c. 0.84 eV d. 0.54 eV e. 1.4 eV

Escape Speed: The value of g at the surface of spherical Asteroid X is 0.00600 m/s2, and the escape speed is 9.95 m/s. What is the radius of this asteroid? (G = 6.67 × 10-11 N ? m2/kg2)

A. 8250 m B. 16,000 m C. 1600 m D. 800 m E. 400 m