What are the wavelength limits, in meters, of the audible region of the sound spectrum (v = 344 m/s)?
0.017 m to 17 m
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Significant Figures: The number of significant figures in 10,001 is
A. two. B. three. C. five. D. six.
What observational evidence supports the idea that a collision between two spiral galaxies might lead to the formation of a single elliptical galaxy?
A) Some elliptical galaxies surrounded by shells of stars that probably formed from stars stripped out of smaller galaxies. B) Elliptical galaxies dominate the galaxy populations at the cores of dense clusters of galaxies. C) Elliptical galaxies with stars and gas clouds that orbit differently from the other stars in the galaxy. D) There are giant elliptical galaxies at the center of dense clusters that may have grown by consuming other galaxies. E) All of the above are correct.
A hoop, a solid cylinder, and a solid sphere all have the same mass m and the same radius R. Each is mounted to oscillate about an axis a distance 0.5R from the center. The axis is perpendicular to the circular plane of the hoop and the cylinder and to an equatorial plane of the sphere as shown below. Which is the correct ranking in order of increasing angular frequency ??
?
?
A. hoop, cylinder, sphere B. cylinder, sphere, hoop C. sphere, cylinder, hoop D. hoop, sphere, cylinder E. sphere, hoop, cylinder
The electric field along the axis of a ring-shaped charge of total charge Q distributed uniformly is given by E = Qx/(4? ?0 (x2+ a2)3/2 )
where a is the radius of the ring and x is the distance from the center of the ring. The electric field at the center of the ring is zero and at great distances from the ring approaches zero. At what position is the electric field a maximum for positive values of x?