Two infinite, uniformly charged, flat surfaces are mutually perpendicular. One of the sheets has a charge density of +60 pC/m2, and the other carries a charge density of ?80 pC/m2 . What is the magnitude of the electric field at any point not on either surface?
a. 1.1 N/C
b. 5.6 N/C
c. 7.9 N/C
d. 3.8 N/C
e. 4.0 N/C
b
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An elevator weighing 10,000. N is supported by a steel cable. Determine the tension in the cable when the elevator is accelerated upward at 3.0 m/s2. (g = 9.8 m/s2)
A) 40. kN B) 10. kN C) 7.0 kN D) 13. kN E) 11. kN
A 1.50-m long gas column that is open at one end and closed at the other has a fundamental resonant frequency 80.0 Hz. What is the sound speed in this gas?
A) 120 m/s B) 53.3 m/s C) 30.0 m/s D) 213 m/s E) 480 m/s
A dime is 1.8 cm in diameter. Earth's Moon is 3.844 × 10^10 cm from Earth and has a diameter of 3.76 × 10^8 cm. At what distance from your eye would you have to hold a dime so that it has the same angular diameter as the full Moon?
a. 200 cm b. 2 cm c. 0.2 cm d. 2 AU e. 2 LY
Mass on a Spring: A 51.8-kg bungee jumper jumps off a bridge and undergoes simple harmonic motion. If the period of oscillation is 11.2 s, what is the spring constant (force constant) of the bungee cord?
A. 16.3 N/m B. 19.6 N/m C. 26.1 N/m