Two long parallel wires are 0.400 m apart and carry currents of 4.00 A and 6.00 A. What is the magnitude of the force per unit length that each wire exerts on the other wire? (?0 = 4? × 10-7 T ? m/
A)
A) 2.00 ?N/m B) 12.0 ?N/m C) 38.0 ?N/m D) 16.0 ?N/m E) 5.00 ?N/m
B
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A space station in the form of a large wheel, 120 m in diameter, rotates to provide an "artificial gravity" of 3.00 m/s2 for persons located at the outer rim. Find the rotational frequency of the wheel (in revolutions per minute) that will produce this effect
Coulomb's Law: A small charged plastic ball is vertically above another charged small ball in a frictionless test tube as shown in the figure. The balls are in equilibrium a distance d apart. If the charge on each ball is doubled, the equilibrium distance between the balls in the test tube would become
A. 
d.
B. 2d.
C. 4d.
D. 8d.
E. d/4.
System 1 is 4.20 moles of a monatomic ideal gas held at a constant volume as it undergoes a temperature increase. System 2 is 4.20 moles of a diatomic ideal gas held at constant volume as it also undergoes a temperature increase. The thermal energy absorbed by System 1 is Q1, and the thermal energy absorbed by System 2 is Q2 as both systems undergo a temperature increase of 76.0 K. What is the
ratio Q1/Q2? a. 1.00 b. 0.600 c. 1.67 d. The volumes of the systems need to be known before the ratio can be found. e. 2.50
What is the common trait of all main-sequence stars?
A) They generate energy through hydrogen fusion in their core. B) They are in the final stage of their lives. C) They are all spectral type G. D) They all have approximately the same mass.