An electron moves with a speed of 8.0 × 106 m/s along the +x-axis. It enters a region where there is a magnetic field of 2.5 T,
directed at an angle of 60° to the +x-axis and lying in the xy-plane.
(1 eV = 1.60 × 10-19 C, mel = 9.11 × 10-31 kg) Calculate the magnitude of
(a) the magnetic force on the electron.
(b) the acceleration of the electron.
(a) 2.8 × 10-12 N (b) 3.0 × 1018 m/s2
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Indicate whether the statement is true or false
What is the origin of Earth's atmosphere?
A. Gases were released into the atmosphere by volcanic eruptions. B. Gases were brought to Earth by cometary impacts. C. Gases were released when planetesimals impacted Earth's surface and melted it. D. All of these choices are correct.
At t = 0 the switch S is closed with the capacitor uncharged. If C = 50 ?F, ? = 20 V, and R = 4.0 k?, what is the charge on the capacitor when I = 2.0 mA?
a.
360 ?C
b.
480 ?C
c.
240 ?C
d.
600 ?C
e.
400 ?C
Which wavelength band uses observatories on aircraft?
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