A 500-eV electron and a 300-eV electron trapped in a uniform magnetic field move in circular paths in a plane perpendicular to the magnetic field. What is the ratio of the radii of their orbits?
a. 2.8
b. 1.7
c. 1.3
d. 4.0
e. 1.0
c
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Spheres of Charge: A nonconducting sphere of mass 18.5 kg and diameter 25.0 cm has 8.10 × 1015 electrons removed from it. The points of removal are spread uniformly throughout the volume of this sphere. A tiny neutral plastic ball of mass 0.120 g is placed just outside the surface of the large sphere and is then released. How many electrons must be removed from the plastic ball so that its initial acceleration just after being released will be 1525 m/s2? You can neglect gravity. (e = 1.6 × 10-19 C, k = 1/4??0 = 8.99 × 109 N ? m2/C2)
Fill in the blank(s) with the appropriate word(s).
The LEAST significant evolutionary changes in human beings over the past 10,000 to 40,000 years have been
A) biological B) political C) technological D) cultural
How can the meter stick be used to measure the thickness of a single sheet of the Laboratory Guide
The position of a mass that is oscillating on a spring is given by x = (17.4 cm) cos[(5.46s-1)t]. What is the period of this motion?
A) 1.74 s B) 1.15 s C) 1.32 s D) 0.869 s E) 0.314 s