The circular shape of the Earth's shadow on the Moon during a lunar eclipse suggested to the Greeks that the Earth was
A) cylindrical in shape
B) at the center of the Universe
C) flat
D) spherical in shape
D
You might also like to view...
A box of mass m is placed on an incline with angle of inclination ? . The box does not slide. The magnitude of the frictional force in this case is:
a. ?s mg sin ?. b. mg cos ?. c. mg sin ?. d. not given.
In a double-slit experiment, the slit separation is 2.0 mm, and two wavelengths, 750. nm and 900. nm, illuminate the slits. A screen is placed 2.0 m from the slits
At what distance from the central maximum on the screen will a bright fringe from one pattern first coincide with a bright fringe from the other?
Uniform Circular Motion: One way that future space stations may create artificial gravity is by rotating the station. Consider a cylindrical space station 380 m in diameter that is rotating about its longitudinal axis. Astronauts walk on the inside surface of the space station. How long will it take for each rotation of the cylinder if it is to provide "normal" gravity for the astronauts?
A. 28 s B. 39 s C. 6.2 s D. 4.4 s
The signature of a planet is largest in transit measurements when the planet and star are lined up along the line of sight to the telescope
Indicate whether the statement is true or false