A neutron passes by Earth at relativistic speed. Earth scientists observe the process of the neutron decaying into a proton, an electron, and a neutrino. Compared to the same type of process on Earth, earthbound observers would say that the process in the moving neutron
A. No process in another reference frame can be observed.
B. appears to happen faster.
C. appears to happen at the same rate.
D. appears to happen more slowly.
Answer: D
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Series/Parallel Circuits: If 1.5 A flows through R2, what is the emf V of the ideal battery in the figure?
A. 150 V B. 75 V C. 60 V D. 30 V
A 120.0 N picture hangs from a nail in the wall. The maximum shear stress the nail can sustain is 
The smallest diameter the nail can be is
A. 10.46 mm. B. 12.36 mm. C. 14.84 mm. D. 16.67 mm. E. 18.35 mm.
A main-sequence star's luminosity can directly inform us of
A) the star's radius. B) the rate at which it converts hydrogen to helium. C) the star's mass. D) the star's distance from us.
How necessary is soap for removing salt from your hands?
A) Soap is necessary because it has both a polar and nonpolar end to interact with the positive and negative ions in the salt. B) Soap is necessary because it creates a film on the surface of your skin, shielding it from interacting with the ionic charges of the salt. C) Soap is not at all necessary for removing salt from your hands. The strong ion-dipole interactions between fresh water and the salt are most sufficient to lift the salt away from your hands. D) Soap is not necessary because there are no electrical charges on the skin of your hands for the salt to interact with.