A charged particle of mass 1.0 x 10-26 kg enters a region of magnetic field at a speed of 
at an angle of 37 degrees relative to the magnetic field direction. If the magnetic field strength is 1.2 T and the charge of the particle is +e, what will be the radius of the helical path it takes?
A. insufficient information given.
B. 15 cm
C. 11 cm
D. 8.9 cm
D. 8.9 cm
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Which of the following operations will not change a vector?
A) Translate it parallel to itself. B) Rotate it. C) Multiply it by a constant factor. D) Add a constant vector to it. E) Subtract a constant vector from it.
Adam's toy gun emits blue light, Sue's emits red light, Bonnie's emits infrared light, and James's emits ultraviolet light. Which gun produces the most energetic light?
A. Bonnie B. Sue C. James D. Adam E. All of the toy guns have the same energy.
According to the special theory of relativity, which of the following happens to the length of an object, measured in the dimension parallel to the motion of its inertial frame of reference, as the velocity of this frame increases with respect to a stationary observer?
a. length increases b. length decreases c. length remains constant d. length vanishes to zero when velocity equals half speed of light
The radiation given off by the nucleus of an atom is called
a. a microwave. b. a gamma ray. c. an X-ray. d. any of these.