An alpha particle (mass = 6.68 × 10^?27 kg) is emitted from a radioactive nucleus with a kinetic energy of 4.55 MeV. How fast is the alpha particle moving in m/s? (1 MeV = 1.6 × 10^?13 J)
a. 3.84E+3 m/s
b. 1.48E+7 m/s
c. 1.04E+7 m/s
d. 3.82E+7 m/s
e. 5.11E+6 m/s
b
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When a ball falls downward, it may have a net force
A) equal to its weight. B) of zero. C) equal to its weight minus air drag. D) any of the above E) none of the above
A small object has charge Q. Charge q is removed from it and placed on a second small object. The two objects are placed 1 m apart. For the force that each object exerts on the other to be a maximum, q should be:
A) 2Q B) Q C) Q/2 D) Q/4 E) 0