Instructions: On occasion, the notation 
= [A, ?] will be a shorthand notation for 
.
The rectangular coordinates of a point are (5.00, y) and the polar coordinates of this point are (r, 67.4°). What is the value of the polar coordinate r in this case?
A. 1.92
B. 4.62
C. 12.0
D. 13.0
E. More information is needed.
Answer: D
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Answer the following statement(s) true (T) or false (F)
1. We can consider a set of all chlorine atoms in a block of salt (sodium chloride) to be a “system.” 2. We can consider that set to be an “extended object.” 3. Consider a three-particle system. The center of mass of this system must lie on the plane that contains all three particles. T or F? Be prepared to explain why or why not. 4. In the situation discussed in problem C4T.10, which would be the easiest reasonably valid frame to use? 5. A reference frame attached to a train is a reasonably good inertial frame if the train is stopped at a station.
A 10-N falling object encounters 4 N of air resistance. The net force on the object is
A) 0 N. B) 4 N. C) 6 N. D) 10 N. E) none of the above
Two long parallel wires are separated by 2.0 cm. The current in one of the wires is three times the other current. If the magnitude of the force on a 2.0-m length of one of the wires is equal to 60 ?N, what is the greater of the two currents?
a. 2.0 A b. 1.0 A c. 3.0 A d. 9.0 A e. 1.5 A
The laws of thermodynamics can be related to the following: (i) the measurement of temperature, (ii) the lowest temperature possible, (iii) conservation of energy, and (iv) only part of heat energy available may be turned into work. Which of these involve the first and second law?
a. (i) and (ii) c. (i) and (iii) b. (ii) and (iv) d. (iii) and (iv)