A pair of 10-N vectors at right angles to each other has a resultant of about
A) 10 N.
B) 14 N.
C) 20 N.
D) none of the above
Answer: B
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When a ferromagnetic material that has been magnetized is brought to a temperature greater than the Curie temperature, what happens to its residual magnetism?
A. Nothing happens to the residual magnetism. B. The residual magnetism disappears. C. The residual magnetism reaches it's highest value. D. All the magnetic domains causing magnetism become a single domain. E. The material of the magnet melts causing currents that are magnetic.
Alpha particles (charge = +2e, mass = 6.68 × 10-27 kg, e = 1.60 × 10-19 C) are accelerated in a cyclotron to a final orbit radius of 0.90 m. The magnetic field in the cyclotron is 0.30 T
The period of the circular motion of the alpha particles is closest to A) 0.44 ?s. B) 0.67 ?s. C) 0.87 ?s. D) 1.1 ?s. E) 1.3 ?s.
Brewster's Angle: What is Brewster's angle for light traveling in vacuum and reflecting off a piece of glass having a refractive index of 1.52?
A. 48.9° B. 33.3° C. 48.1° D. 56.7° E. 41.1°
Which contains more atoms?
A) 1 kg of hydrogen B) 1 kg of iron C) both contain the same