Dark matter makes up 18.7% of the Universe
a. True
b. False
Indicate whether the statement is true or false
False
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Power: A typical incandescent light bulb consumes 75 W of power and has a mass of 30 g. You want to save electrical energy by dropping the bulb from a height great enough so that the kinetic energy of the bulb when it reaches the floor will be the same as the energy it took to keep the bulb on for 1.0 hour. From what height should you drop the bulb, assuming no air resistance and constant g?
Fill in the blank(s) with the appropriate word(s).
A charged particle (q = ?8.0 mC), which moves in a region where the only force acting on the particle is an electric force, is released from rest at point A. At point B the kinetic energy of the particle is equal to 4.8 J. What is the electric potential difference VB ? VA?
a. ?0.60 kV b. +0.60 kV c. +0.80 kV d. ?0.80 kV e. +0.48 kV
What type of particle accelerator has two large D-shaped electrodes with a small gap between them, through which an alternating potential difference accelerates the particles in a constant magnetic field?
A) linear accelerator B) synchrotron C) cyclotron D) None of the above
A charged capacitor is connected to an inductor to form an LC circuit with a frequency of oscillation f = 1.6 Hz. At time t = 0 the capacitor is fully charged
At a given instant later the charge on the capacitor is measured to be Q = 3 ?C and the current in the circuit is equal to 75 ?A. What is the maximum charge of the capacitor? A) 6 ?C B) 10 ?C C) 8 ?C D) 2 ?C E) 4 ?C