A main difference between gravitational and electric forces is that electric forces
A) attract.
B) repel or attract.
C) obey the inverse-square law.
D) act over shorter distances.
E) are weaker.
Answer: B
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A trapeze artist, with swing, weighs 700 N; he is being held to one side by his partner so that the swing ropes make an angle of 40.0° with the vertical. In such a condition of static equilibrium, what is the tension in the rope?
a. 9.1E+2 N b. 5.4E+2 N c. 700 N d. 1.4E+3 N e. 9.6E+2 N
The diameter of a 12-gauge copper wire is 0.081 in. The maximum safe current it can carry (in order to prevent fire danger in building construction) is 20 A. At this current, what is the drift velocity of the electrons?
The number of electron carriers in 1.0 cm3 of copper is 8.5 × 1022 and e = 1.60 × 10-19 C. A) 0.044 mm/s B) 0.44 mm/s C) 0.44 cm/s D) 0.44 m/s E) 4.4 cm/s
Which of the following statements is true of Jupiter?
A) It is more than 5.5 times denser than water. B) The interior of Jupiter is mostly liquid helium. C) The rocky core at Jupiter's center contains light elements. D) It has a slightly flattened shape.
The position of a particle as it moves along the x axis is given for t> 0 by x = (t3? 3t2 + 6t) m, where t is in s. Where is the particle when it achieves its minimum speed (after t = 0)?
A. 3 m B. 4 m C. 8 m D. 2 m E. 7 m