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
White-light LEDs employ
A) phosphors. B) white-emitting diodes. C) extra-high electrical barriers. D) none of the above
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?
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.