An electron moves in a region where the magnetic field is uniform, has a magnitude of 60 ?T, and points in the positive x direction. At t = 0 the electron has a velocity that has an x component of 30 km/s, a y component of 40 km/s, and a z component of zero. What is the radius of the resulting helical path?
a. 4.7 mm
b. 18 mm
c. 3.8 mm
d. 2.8 mm
e. 5.7 mm
c
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A student in the front of a school bus tosses a ball to another student in the back of the bus while the bus is moving forward at constant velocity. The speed of the ball as seen by a stationary observer in the street:
a. is less than that observed inside the bus. b. is the same as that observed inside the bus. c. is greater than that observed inside the bus. d. may be either greater or smaller than that observed inside the bus. e. may be either greater, smaller, or equal to that observed inside the bus.
An unclad optical fiber has index of refraction 1.40 . What is the acceptance angle for this fiber if it is submerged in a fluid with index of refraction 1.30? The acceptance angle is the greatest angle at which the light enters the end of the fiber and still causes total internal reflection
a. 69.0° c. 45.8° b. 23.6° d. Any angle will be accepted.
Velocity Addition: In an "atom smasher," two particles collide head on at relativistic speeds. If the velocity of the first particle is 0.741c to the left, and the velocity of the second particle is 0.543c to the right (both as measured in the lab rest frame), how fast are the particles moving with respect to each other?
A. 0.916c B. 1.284c C. 0.934c D. 0.834c
What type of software is shown in the figure above?
A. photo sharing B. image-editing C. illustration D. digital photography