An electron which moves with a speed of 4.5 × 10^4 m/s perpendicular to a uniform magnetic field of 0.57 T experiences a force of what magnitude? (e = 1.6 × 10^?19 C)
a. zero
b. 6.57E–33 N
c. 2.05E–15 N
d. 1.26E–14 N
e. 4.10E–15 N
e
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Gauss's Law: A uniform electric field with a magnitude of 6 × 106 N/C i is directed along the +x-axis. A cube having edges of length 0.1 m is oriented as shown in the figure. What is the electric flux passing through the shaded face of the cube?
A. 0.6 × 104 N m2/C B. 6 × 104 N m2/C C. 60 × 104 N m2/C D. 600 × 104 N m2/C E. 6000 × 104 N m2/C
In beta decay, the emitted particle is
a) an electron b) a photon of electromagnetic energy. c) a hydrogen nucleus. d) the nucleus of a helium atom. • •
Which of the following best characterizes electrical insulators?
a. charges on the surface don't move b. high tensile strength c. electric charges move freely d. good heat conductors
During the investigation of a traffic accident, police find skid marks 90 m long. They determine the coefficient of friction between the car's tires and the roadway to be 0.50 for the prevailing conditions
Estimate the speed of the car when the brakes were applied.