Force on a Moving Charge: A proton moving eastward with a velocity of 5.0 km/s enters a magnetic field of 0.20 T pointing northward. What are the magnitude and direction of the force that the magnetic field exerts on the proton? (e = 1.60 × 10-19 C)
A. 0 N
B. 1.6 × 10-16 N upwards
C. 1.6 × 10-16 N downwards
D. 1.1 × 10-16 N eastwards
E. 4.4 × 10-16 N westwards
Answer: B
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A specimen is made of 80 atom % iron and 20 atom % Ni. When sufficient FCC nickel is added to BCC iron, it is possible to produce FCC iron-nickel alloys, which are austenitic. The results of an x-ray diffractometer scan of this specimen with cobalt K? radiation that has a wavelength of 0.1790 nm results in peak intensities at the following angles: 26.1°, 30.56°, 45.99°, 57.49°, and 61.74°.
(a) Is this iron-nickel alloy BCC or FCC? (b) Determine the lattice parameter using the 26.1? peak.
Which of the six objects shown below has the largest rotational energy? (All have the same mass.)
A. 
B. 
C. 
D. 
E. 
F. 
When a beam of light, which is traveling in air, is reflected by a glass surface, there is
A) a 90° phase change in the reflected beam. B) no phase change in the reflected beam. C) a 180° phase change in the reflected beam. D) a 60° phase change in the reflected beam. E) a 45° phase change in the reflected beam.
In a sedimentary rock that contains inclusions of metamorphic rock, the inclusions must be
A) older than the sedimentary rock. B) younger than the sedimentary rock. C) on top of the sedimentary rock. D) below the sedimentary rock.