Conversion of Units: An oak tree was planted 22 years ago. How many seconds does this correspond to? (Do not take leap days into account.)
A. 6.9 × 108
B. 1.2 × 107
C. 2.9 × 107
D. 2.8 × 108
Answer: A
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If the spiral density wave were the only thing producing spiral arms, it would be expected that
a. all spiral arms would be gas and dust free. b. all galaxies would have only two smooth spiral arms. c. the Milky Way would show and irregular pattern of short arms . d. the Milky Way wouldn't have any spiral arms. e. the halo component of the Milky Way would show spiral arms as well.
Which of the following are found on Triton?
a. craters b. flooded basins c. atmospheric clouds d. a thick nitrogen atmosphere e. craters, flooded basins, atmospheric clouds, and a thick nitrogen atmosphere
A hydrogen atom is in its first excited state (n = 2). The linear momentum of the electron is (in kg ? m/s)
a. 3 × 10^?24 b. 2 × 10^?24 c. 1 × 10^?24 d. 4 × 10^?24 e. 3 × 10^?15
A particle (charge 7.5 mC) is released from rest at a point on the x axis, x = 10 cm. It begins to move due to the presence of a 2.0-mC charge which remains fixed at the origin. What is the kinetic energy of the particle at the instant it passes the point x = 1.0 m?
a. 3.0 J b. 1.8 J c. 2.4 J d. 1.2 J e. 1.4 J