Compared to a single lamp connected to a battery, two identical lamps connected in series to the same battery will draw
A) more current.
B) less current.
C) the same current.
Answer: B
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Simple Harmonic Motion: The figure shows a graph of the velocity v as a function of time t for a system undergoing simple harmonic motion. Which one of the following graphs represents the acceleration of this system as a function of time?
A. graph a B. graph b C. graph c D. graph d
A 3.45-kg centrifuge takes 100 s to spin up from rest to its final angular speed with constant angular acceleration
A point located 8.00 cm from the axis of rotation of the centrifuge moves with a speed of 150 m/s when the centrifuge is at full speed. (a) What is the angular acceleration (in rad/s2 ) of the centrifuge as it spins up? (b) How many revolutions does the centrifuge make as it goes from rest to its final angular speed?
White-light LEDs employ
A) phosphors. B) white-emitting diodes. C) extra-high electrical barriers. D) none of the above
Which statement about images is correct?
A) A virtual image cannot be formed on a screen. B) A virtual image cannot be viewed by the unaided eye. C) A virtual image cannot be photographed. D) A real image must be erect. E) Mirrors always produce real images because they reflect light.