A series LR circuit consists of a 2.0-H inductor with negligible internal resistance, a 100-ohm resistor, a switch, and a 9.0-V power source. After the switch is closed, what is the maximum power delivered by the power supply?
A)
0.40 W
B)
81 W
C)
0.090 W
D)
8.1 W
E)
0.81 W
E
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A 1200 kg car is moving at 5.0 m/s EAST. It strikes an 1800 kg car at rest. The cars have an elastic collision and move in the EAST or WEST direction. The velocity of the 1200 kg car after the collision is
A. 4.0 m /s EAST. B. 1.0 m/s EAST. C. 4.0 m/s WEST. D. 1.0 m/s WEST. E. 3.00 m/s EAST.
Vision Problems: A nearsighted person has a far point that is 4.2 m from his eyes. What power contact lenses must he wear to allow him to focus on distant mountains?
A. 0.48 diopters B. -0.48 diopters C. -0.36 diopters D. -0.24 diopters E. 0.24 diopters
A 2.0-m rope is lying on a table. You pick up one end and start raising it vertically. How high above the table is the center of mass of the rope when half of the rope has lifted off the table?
A) 0.25 m B) 0.50 m C) 0.75 m D) 1.0 m E) 1.5 m
A uranium nucleus (mass 238 units) at rest decays into a helium nucleus (mass 4.0 units) and a thorium nucleus (mass 234 units). If the speed of the helium nucleus is 1.8 × 10^6 m/s, what is the speed of the thorium nucleus?
a. 1.0 × 10^4 m/s c. 3.6 × 10^4 m/s b. 3.1 × 10^4 m/s d. 4.1 × 10^4 m/s