At every instant the ratio of the magnitude of the electric to the magnetic field in an electromagnetic wave in vacuum is equal to
a. the speed of radio waves.
b. the speed of light.
c. the speed of gamma rays.
d. all of the above.
e. only (a) and (b) above.
d
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A turntable has a moment of inertia of 3.0 × 10^?2 kg·m2 and spins freely on a frictionless bearing at 25 rev/min. A 0.60-kg ball of putty is dropped vertically on the turntable and sticks at a point 0.10 m from the center. By what factor does the kinetic energy of the system change after the putty is dropped onto the turntable?
a. 0.91 b. 1.0 c. 0.83 d. 1.5
The phenomenon of beats results from sound
A) refraction. B) reflection. C) interference. D) all of the above E) none of the above
An object moves 15.0 m north and then 11.0 m south. Find both the distance it has traveled and the magnitude of its displacement
A) 4.0 m, 26.0 m B) 26.0 m, 4.0 m C) 26.0 m, 26.0 m D) 4.0 m, 4.0 m
Because of their greater luminosity, RR Lyrae stars can be used at greater distances than can long-period Cepheids
Indicate whether the statement is true or false