After landing on an unexplored Klingon planet, Spock tests for the direction of the magnetic field by firing a beam of electrons in various directions and by observing the following: Electrons moving upward feel a magnetic force in the NW direction
; Electrons moving horizontally North are pushed down; Electrons moving horizontally South-East are pushed upward. He naturally concludes that the magnetic field at this landing site is in which direction? A) W
B) SE
C) NE
D) SW
E) E
D
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The sound of 40 decibels is
A) twice as intense as the sound of 20 decibels. B) four times as intense as the sound of 20 decibels. C) 10 times as intense as the sound of 20 decibels. D) 100 times as intense as the sound of 20 decibels. E) 1000 times as intense as the sound of 20 decibels.
Early 21st Century research in nuclear fusion uses
A) laser beams. B) ultra-hot plasmas. C) both of these D) neither of these
Phase Angles: At 1.0 kHz, the phase angle of an RLC series circuit with a capacitive reactance of 40 ?, a resistance of 100 ?, and a certain inductor is 40°. What is the inductance in this circuit?
A. 12 mH B. 120 mH C. 210 mH D. 62 mH E. 20 mH
Momentum: A rubber ball and a lump of clay have equal mass. They are thrown with equal speed against a wall. The ball bounces back with nearly the same speed with which it hit. The clay sticks to the wall. Which one of these objects experiences the greater momentum change?
A. the ball B. the clay C. Both of them experience the same non-zero momentum change. D. Both of them experience zero momentum change.