The wave speed in an aluminum wire with a radius of 1.00 mm is 120 m/s. What is the tension in the wire? The density of aluminum is 2.70 × 103 kg/m3
A) 112 N
B) 100 N
C) 134 N
D) 427 N
E) 122 N
E
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A proton is located at the point (x = 1.0 nm, y = 0.0 nm) and an electron is located at the point Find the magnitude of the electrostatic force that each one exerts on the other. (k = 1/4??0 = 9.0 × 109 N ? m2/C2, e = 1.6 × 10-19 C)
A) 1.4 × 10-11 N B) 5.3 × 10-18 N C) 5.3 × 108 N D) 5.9 × 10-15 N
Recently discovered brown dwarfs have spectra similar to cool O-type stars
a. True b. False Indicate whether the statement is true or false
When Paul compresses air with a tire pump, the temperature of the compressed air
A) drops. B) remains unchanged. C) increases as work is done on it. D) none of the above
Magnetic fields are produced by
a. constant electric currents. b. electric currents that vary sinusoidally with time. c. time-varying electric fields. d. all of the above. e. only (a) and (b) above.