Marie & Pierre Curie
A) discovered radioactivity.
B) proposed the plum-pudding model.
C) proposed the tiny central nucleus idea.
D) observed back-scattering from nuclei.
E) discovered radium and polonium.
E
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An electron is moving at
m/s at an angle of 40
to a 0.80 T magnetic field. What is the magnitude of the acceleration of the electron?
A. 
B. 
C. 
D. 
E. 
Two particles, each having a mass of 3.0 ?g and having equal but opposite charges of magnitude of 6.0 nC, are released simultaneously from rest when they are a very large distance apart. What distance separates the two at the instant when each has a speed of 5.0 m/s?
a. 4.3 mm b. 8.6 mm c. 7.3 mm d. 5.6 mm e. 2.2 mm
A parsec is slightly more than 200,000 AU
Indicate whether the statement is true or false
A 0.500-kg ball traveling horizontally on a frictionless surface approaches a very massive stone at 20.0 m/s perpendicular to wall and rebounds with 70.0% of its initial kinetic energy
What is the magnitude of the change in momentum of the stone? A) 18.4 kg ? m/s B) 14.0 kg ? m/s C) 3.00 kg ? m/s D) 1.63 kg ? m/s E) 0.000 kg ? m/s