If 3 different conservative forces and one non-conservative force act within a system, how many potential energy terms appear in the energy equation that describes the system?
1.0
2.1
3.3
4.4
3
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An electromagnetic wave is propagating towards the west. At a certain moment the direction of the magnetic field vector associated with this wave points vertically up. The direction of the electric field vector of this wave is
A) horizontal and pointing south. B) vertical and pointing down. C) horizontal and pointing north. D) vertical and pointing up. E) horizontal and pointing east.
An astronaut has landed on Planet N-40 and conducts an experiment to determine the free fall acceleration on that planet
She uses a simple pendulum that is 0.640 m long and measures that 10 complete oscillations 26.0 s. What is the free fall acceleration on Planet N-40? A) 4.85 m/s2 B) 1.66 m/s2 C) 3.74 m/s2 D) 2.39 m/s2 E) 9.81 m/s2
Instructions: On occasion, the notation 
will be a shorthand notation for 
.
A vector,
, when added to the vector 
yields a resultant vector which is in the positive y direction and has a magnitude equal to that of 
. What is the magnitude of ?
A. 3.2
B. 6.3
C. 9.5
D. 18
E. 5
The current through a 50. ? resistor is I = 0.80 sin (240. t) amperes
(a) At what frequency does the current vary? (b) How much power is dissipated in the resistor?