A 1200-kg cannon suddenly fires a cannonball at What is the recoil speed of the cannon? Assume that frictional forces are negligible and the cannon is fired horizontally
A) 2.9 m/s
B) 35 m/s
C) 3.5 m/s
D) 3.2 m/s
A
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What is the wave speed in a brass wire with a radius of 0.500 mm stretched with a tension of 125 N? The density of brass is 8.60 × 103 kg/m3
A) 0.121 m/s B) 136 m/s C) 100 m/s D) 500 m/s E) 68.8 m/s
A spaceship is moving past you at a speed very close to the speed of light. If you could somehow watch the people inside it over a long period of time, what would you conclude?
A) They are aging more rapidly than you. B) Their mechanical clocks go slower than yours, but the people are aging at the same rate as you. C) Their time is the same as your time. D) They are aging more slowly than you.
Potential: As a proton moves in the direction the electric field lines
A. it is moving from low potential to high potential and gaining electric potential energy. B. it is moving from low potential to high potential and losing electric potential energy. C. it is moving from high potential to low potential and gaining electric potential energy. D. it is moving from high potential to low potential and losing electric potential energy. E. both its electric potential and electric potential energy remain constant.
LC Circuits: A series circuit contains an 80-?F capacitor, a 0.020-H inductor, and a switch. The resistance of the circuit is negligible. Initially, the switch is open, the capacitor voltage is 50 V, and the current in the inductor is zero. At time t = 0 s, the switch is closed. When the current in the circuit is 1.5 A, what is the charge on the capacitor?
A. 2000 µC B. 2500 µC C. 3000 µC D. 3500 µC E. 4000 µC