During ?- decay
A) a neutron is transformed to a proton.
B) a proton is transformed to a neutron.
C) a neutron is ejected from the nucleus.
D) a proton is ejected from the nucleus.
E) the number of nucleons increases.
A
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The radius of the second dark ring is 2.0 mm. What is the radius of curvature of the curved side of the lens? A) 9.6 m B) 2.4 m C) 4.8 m D) 7.2 m E) 1.2 m
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A cyclist races around a circular track at the constant speed of 20 m/s. The radius of the track is 40 m. The centripetal acceleration of the cyclist is
A. 10 m/s2, downward. B. 10 m/s2, toward the center of the track. C. zero. D. 20 m/s2, in the direction of travel.