A charged particle (mass = m, charge = q > 0) moves in a region of space where the magnetic field has a constant magnitude of B and a downward direction. What is the magnetic force on the particle at an instant when it is moving horizontally toward the north with speed v?
a. qvB toward the east
b. Zero
c. qvB toward the west
d. qvB upward
e. qvB toward the south
c
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The synodic period of the moon
a. is about 27.32 days long. b. is the period of time for the moon to orbit Earth once with respect to the stars. c. is the period of time between successive eclipses at a given location on Earth. d. is the period of time from when the moon rises until the moon rises again the next night. e. none of the above
For the titanium with a 2 % pre-strain in Figure 7.9, what grain size would result in a yield stress of 1000 MPa? You can use the results of Example Problem 7.2 to determine your answer.
What will be an ideal response?
Two pulses of light, one red and one blue, have the same energy. The pulse with the greater number of photons is the
A) red pulse. B) blue pulse. C) both the same
Which of the following is the smallest dwarf planet?
a. Ceres b. Mercury c. Pluto d. Eris