When the number of protons in a nucleus exceeds ______________, the nucleus is unstable
a. 65
b. 56
c. 83
d. 103
c
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Mass on a Spring: A block attached to an ideal spring of force constant (spring constant) 15 N/m executes simple harmonic motion on a frictionless horizontal surface. At time t = 0 s, the block has a displacement of -0.90 m, a velocity of -0.80 m/s, and an acceleration of +2.9 m/s2. The mass of the block is closest to
A. 2.3 kg B. 2.6 kg C. 4.7 kg D. 9.4 kg
Length Contraction: A spaceship with a constant velocity of 0.800c relative to Earth travels to the star that is 4.30 light-years from Earth. What distance does the space ship travel as measured by a passenger on the ship?
A. 2.58 light-years B. 3.52 light-years C. 4.12 light-years D. 4.30 light-years
A bumper car is moving at constant velocity when another bumper car starts to push on it with a constant force at an angle of 60 degrees with respect to the first car's initial velocity. The second bumper car continues pushing in exactly that direction for some time. What is most likely to happen is that
A. the first car will stop moving. B. the first car will move in the direction of the force. C. the first car's velocity will increase in magnitude but not change direction. D. the first car's velocity will gradually change direction more and more toward that of the force while increasing in magnitude. E. the first car's velocity will gradually change direction more and more toward that of the force while decreasing in magnitude.
A velocity selector uses a fixed electric field of magnitude E and the magnetic field is varied to select particles of various energies. If a magnetic field of magnitude B is used to select a particle of a certain energy and mass, what magnitude of magnetic field is needed to select a particle of equal mass but twice the energy?
a. 0.50 B b. 1.4 B c. 2.0 B d. 0.71 B e. 1.7 B