According to Heisenberg, as the uncertainty in the measurement of a particle's momentum is reduced by a factor of 2, by what factor is the uncertainty in that same particle's position changed?
a. 1/2
b. 1
c. 2
d. 4
c
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Three pith balls supported by insulating threads hang from a support. We know that ball X is positively charged. When ball X is brought near balls Y and Z without touching them, it attracts Y and repels Z. Since pith is an insulating material, we can conclude that
a. Y has a negative charge. b. Z has a negative charge. c. Y has a positive charge. d. Z is neutral (has no net charge). e. Y is negatively charged or neutral (has no net charge).
A circular coil (radius = 0.25 m) has 143 turns and is in a uniform magnetic field. If the orientation of the coil is varied through all possible positions, the maximum torque on the coil by magnetic forces is 0.29 N?m when the current in the coil is 2.7 mA. What is the magnitude of the magnetic field?
a. 5.47 T b. 0.304 T c. 3.83 T d. 137 T
Based on current evidence, a supercluster is most likely to have formed in regions of space where ________
A) the acceleration of the expansion was proceeding faster than elsewhere B) the density of dark matter was slightly higher than average when the universe was very young C) supermassive black holes were present in the very early universe D) there was an excess concentration of hydrogen gas when the universe was very young
If there is no external applied force, the sum of the internal stresses in a composite is equal to _________.
Fill in the blank(s) with the appropriate word(s).