Which of the following is believed to have played a major role in the condensation process predicted by the condensation theory?
a. Dust
b. Temperature
c. Retrograde motion
d. Protosuns
a
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Two long, parallel wires carry currents of 4.00 A and 6.00 A. If the distance between the wires is 0.400 m, what is the force per unit length between the wires?
A) 2.00 ?N/m B) 5.00 ?N/m C) 12.0 ?N/m D) 16.0 ?N/m E) 38.0 ?N/m
Potential of Point-Charges: The three point charges shown in the figure form an equilateral triangle with sides 4.9 cm long. What is the electric potential (relative to infinity) at the point indicated with the dot, which is equidistant from all three charges? Assume that the numbers in the figure are all accurate to two significant figures. (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 0.00 V B. 1300 V C. 640 V D. 1900 V
A spherical air bubble originating from a scuba diver at a depth of 14.0 m has a diameter of 0.8 cm. What will the bubble's diameter be when it reaches the surface? (Assume constant temperature.)
a. 1.9 cm b. 1.2 cm c. 1.1 cm d. 0.9 cm e. 1.7 cm
A woman who weighs 500 N stands on a 6.0-m-long board that weighs 100 N. The board is supported at each end. The support force at the right end is 3 times the support force at the left end. How far from the right end is the woman standing?
a. 4.8 m b. 2.1 m c. 1.7 m d. 1.2 m e. 3.9 m