A laser beam emits
photons per second with a wavelength of 663 nm. What is the power output of this laser?
A. 51 mW
B. 67 mW
C. 51 W
D. 75 W
E. 93 W
D. 75 W
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Project a cannonball from atop Newton's hypothetical mountain at 8 km/s and it orbits Earth. Project it at 9 km/s and the shape of the orbit is
A) a somewhat larger circle. B) a wide parabola. C) an ellipse.
The type of EM wave used in aircraft radar is
a. radio waves. b. microwaves. c. x-rays. d. gamma rays.
In 1851 Jean Bernard Leon Foucault demonstrated the rotation of the earth using a pendulum 11.0 m long, which was set up in the Paris Observatory
How long would it have taken for Foucault's pendulum to make one complete swing back to its starting point if g = 9.81 m/s2 at the observatory? A) 6.65 s B) 5.63 s C) 1.79 s D) 2.12 s E) 2.58 s
In an LR series circuit connected to a dc source and a switch, the inductor gets 40% of its maximum current 1.8 s after the switch is closed at t = 0 s. What is the time constant of this circuit?
A) 0.80 s B) 1.5 s C) 2.5 s D) 3.5 s E) 5.5 s