The current definition of the standard kilogram of mass is based on
A) the mass of the earth.
B) the mass of the sun.
C) the mass a particular object kept in France.
D) the mass of a cesium-133 atom.
C
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Ignoring air resistance, the velocity of a falling object
A. is constant B. increases for a while, then becomes constant. C. depends on the mass of the object. D. is constantly increasing
Two stereo speakers mounted 4.52 m apart on a wall emit identical in-phase sound waves. You are standing at the opposite wall of the room at a point directly between the two speakers
You walk 2.11 m parallel to the wall, to a location where you first notice that the sound intensity drops to zero. If the wall along which you are walking is 10.7 m from the wall with the speakers, what is the wavelength of the sound waves? CAREFUL! The distance to the wall is NOT much greater than the distance between the speakers. A) 1.7 m B) 2.1 m C) 2.6 m D) 2.9 m
A charged particle moving perpendicular to a uniform magnetic field will follow a circular path with radius r = mv/Bq. If the magnetic field is doubled, what happens to the time that it takes for the particle to complete one loop around its path?
1.It doubles. 2.It quadruples. 3.It halves. 4.It stays the same.
Normal atmospheric pressure is
a. 14.7 psi b. 1 N/m2 c. zero d. 760 mm of mercury e. 101,000 pascals f. none of the above