The boundary shown is that of a uniform magnetic field directed in the positive z direction. An electron enters the magnetic field with a velocity pointing along the x axis and exits 0.63 ?s later at point A. What is the magnitude of the magnetic field?
a.
18 ?T
b.
14 ?T
c.
28 ?T
d.
34 ?T
e.
227 ?T
b
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Why are there fewer large impact craters on the Earth's seafloor than on the continents?
A) Seafloor crust is younger than continental crust, so it has had less time in which to suffer impacts. B) The oceans slow large impactors and prevent them from making craters. C) Erosion erases impact craters must faster on the ocean bottom than on land. D) Most impacts occur on the land.
A mass on a spring vibrates in simple harmonic motion at a frequency of 3.2 Hz and an amplitude of 6.4 cm. If a timer is started when its displacement is a maximum (hence x = 6.4 cm when t = 0), what is the displacement of the mass when t = 3.3 s?
a. zero b. –5.95 cm c. –2.36 cm d. 2.53 cm
If these are sound waves, which corresponds to the highest pitch?
1) Wave I 2) Wave II 3) Wave III 4) Wave IV And which has the greatest wavelength? 5) Wave I 6) Wave II 7) Wave III 8) Wave IV 9) all have the same wavelength
Star A has a temperature 1/2 that of star B, but star A is 5 times bigger than star B. Which statement below is correct?
A) Star A is redder and dimmer than star B. B) Star A is bluer and dimmer than star B. C) Star A is redder and brighter than star B. D) Star A is bluer and brighter than star B. E) Star A and star B have the same color, but star A is brighter.