The radial distance to the event horizon from the singularity of a black hole is called
a. the Roche limit.
b. the Schwarzschild radius.
c. the Hubble unit.
d. none of the above.
b
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If we divide the mass of a star by its volume we calculate the star's ____________________
Fill in the blank(s) with correct word
Rotational Kinetic Energy: A solid sphere, solid cylinder, and a hollow pipe all have equal masses and radii. If the three of them are released simultaneously at the top of an inclined plane and do not slip, which one will reach the bottom first?
A. sphere B. pipe C. cylinder D. The pipe and cylinder arrive together before the sphere. E. They all reach the bottom at the same time.
Lens-Maker Formula: A double-convex thin glass lens has equal-magnitude radii of curvature. The focal length of the lens is +37.3 cm and the index of refraction of the glass is 1.52. What is the magnitude of the radius of curvature of each convex surface?
A. 39 cm B. 35 cm C. 31 cm D. 43 cm E. 46 cm
Single-Slit Diffraction: A beam of light of wavelength 630 nm is incident on a slit that is 0.400 mm wide. If the distance between the slit and the screen is 1.80 m, what is the width on the screen of the central bright fringe?
A. 1.94 mm B. 2.94 mm C. 3.54 mm D. 5.67 mm E. 6.94 mm