When you stand in front of a convex mirror, the image you see is
A. real and inverted.
B. real and upright.
C. virtual and inverted.
D. virtual and upright.
E. real and inverted if your distance from the mirror is greater than two focal lengths.
Answer: D
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A particle moving along the x axis has a position given by x = 54t? 2.0t3 m. At the time t = 3.0 s, the speed of the particle is zero. Which statement is correct?
A. The particle remains at rest after t = 3.0 s. B. The particle no longer accelerates after t = 3.0 s. C. The particle can be found at positions x< 0 m only when t< 0 s. D. All of the above are correct. E. None of the above is correct.
Two organ pipes, a pipe of fundamental frequency 440 Hz, closed at one end, and a pipe of fundamental frequency 660 Hz, open at both ends, produce overtones. Which choice below correctly describes overtones present in both pipes?
a. After the first overtone of each pipe, every second overtone of the first pipe matches every second overtone of the second pipe. b. After the first overtone of each pipe, every second overtone of the first pipe matches every third overtone of the second pipe. c. After the first overtone of each pipe, every third overtone of the first pipe matches every second overtone of the second pipe. d. After the first overtone of each pipe, every second overtone of the first pipe matches every fourth overtone of the second pipe. e. After the first overtone of each pipe, every third overtone of the first pipe matches every fourth overtone of the second pipe.
In an RLC circuit, the resistance is 10. ohms, the capacitive reactance is 30. ohms, and the inductive reactance is 50. ohms. What is the circuit impedance?
A) 10. ? B) 22. ? C) 90. ? D) 63. ? E) 81. ?
A uniformly charged rod (length = 2.0 m, charge per unit length = 5.0 nC/m) is bent to form one quadrant of a circle. What is the magnitude of the electric field at the center of the circle?
A. 62 N/C B. 56 N/C C. 50 N/C D. 44 N/C E. 25 N/C