When at rest, a spacecraft has the same height as length. When moving at relativistic speeds in the direction of its length, which one of the following describes its length and height to an observer at rest?
a. Its length is decreased and its height is increased.
b. Its length is decreased and its height is decreased.
c. Its length is decreased and its height is unchanged.
d. Its length is unchanged and its height is increased.
e. Its length is increased and its height is decreased.
c
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What evidence suggests that the protogalactic cloud that formed the Milky Way resulted from several collisions among smaller clouds?
A) The stars in the halo of the Milky Way are organized into several dense clusters arranged throughout the halo. B) The Milky Way resembles an elliptical galaxy more than other spirals do. C) Halo stars differ in age and heavy-element content, but these variations do not seem to depend on the stars' distance from the galactic center. D) The bulge of the Milky Way is surrounded by many globular clusters, just as elliptical galaxies are. E) The Milky Way is the central galaxy of a cluster of galaxies.
In addition to revolving around the Sun counter clockwise, most planets also rotate on their axis counter clockwise
Indicate whether the statement is true or false
The binding energy of the hydrogen atom in its ground state is -13.6 eV. What is the energy when it is in the n = 5 state?
A) 0.544 eV B) 2.72 eV C) -2.72 eV D) -0.544 eV E) -68 eV
A spaceship of mass m circles a planet (mass = M) in an orbit of radius R. How much energy is required to transfer the spaceship to a circular orbit of radius 3R?
a. GmM/(2R) b. GmM/(3R) c. GmM/(4R) d. GmM/(6R) e. 3GmM/(4R)